Android ImageViewのズームインとズームアウト
Android ImageViewをズームインおよびズームアウトしたい。ほとんどのサンプルを試しましたが、すべてのサンプルで、ImageView自体の画像がズームインおよびズームアウトされていますが、ImageViewをズームインおよびズームアウトしたいです。ズームイン中にImageViewの幅と高さを増やし、ズームアウト中にImageViewの幅と高さを減らしたい。どうすればそれを達成できますか？
2つのJavaクラスを作成する
ズームクラス
import Android.content.Context;
import Android.graphics.Canvas;
import Android.graphics.drawable.Drawable;
import Android.view.KeyEvent;
import Android.view.View;
import Android.widget.Button;
import Android.widget.ImageButton;
public class Zoom extends View {
private Drawable image;
ImageButton img,img1;
private int zoomControler=20;
public Zoom(Context context){
super(context);
image=context.getResources().getDrawable(R.drawable.j);
//image=context.getResources().getDrawable(R.drawable.icon);
setFocusable(true);
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
//here u can control the width and height of the images........ this line is very important
image.setBounds((getWidth()/2)-zoomControler, (getHeight()/2)-zoomControler, (getWidth()/2)+zoomControler, (getHeight()/2)+zoomControler);
image.draw(canvas);
}
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if(keyCode==KeyEvent.KEYCODE_DPAD_UP){
// zoom in
zoomControler+=10;
}
if(keyCode==KeyEvent.KEYCODE_DPAD_DOWN){
// zoom out
zoomControler-=10;
}
if(zoomControler<10){
zoomControler=10;
}
invalidate();
return true;
}
}
第二級を作る
import Android.app.Activity;
import Android.os.Bundle;
public class Zoomexample extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle icicle) {
super.onCreate(icicle);
setContentView(new Zoom(this));
}
}
ImageViewのズームインとズームアウトに使用される以下のクラスに従ってください。
import Android.app.Activity;
import Android.graphics.Matrix;
import Android.graphics.PointF;
import Android.os.Bundle;
import Android.util.Log;
import Android.view.MotionEvent;
import Android.view.View;
import Android.view.View.OnTouchListener;
import Android.widget.ImageView;
public class ZoomInZoomOut extends Activity implements OnTouchListener
{
private static final String TAG = "Touch";
@SuppressWarnings("unused")
private static final float MIN_ZOOM = 1f,MAX_ZOOM = 1f;
// These matrices will be used to scale points of the image
Matrix matrix = new Matrix();
Matrix savedMatrix = new Matrix();
// The 3 states (events) which the user is trying to perform
static final int NONE = 0;
static final int DRAG = 1;
static final int ZOOM = 2;
int mode = NONE;
// these PointF objects are used to record the point(s) the user is touching
PointF start = new PointF();
PointF mid = new PointF();
float oldDist = 1f;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
ImageView view = (ImageView) findViewById(R.id.imageView);
view.setOnTouchListener(this);
}
@Override
public boolean onTouch(View v, MotionEvent event)
{
ImageView view = (ImageView) v;
view.setScaleType(ImageView.ScaleType.MATRIX);
float scale;
dumpEvent(event);
// Handle touch events here...
switch (event.getAction() & MotionEvent.ACTION_MASK)
{
case MotionEvent.ACTION_DOWN: // first finger down only
savedMatrix.set(matrix);
start.set(event.getX(), event.getY());
Log.d(TAG, "mode=DRAG"); // write to LogCat
mode = DRAG;
break;
case MotionEvent.ACTION_UP: // first finger lifted
case MotionEvent.ACTION_POINTER_UP: // second finger lifted
mode = NONE;
Log.d(TAG, "mode=NONE");
break;
case MotionEvent.ACTION_POINTER_DOWN: // first and second finger down
oldDist = spacing(event);
Log.d(TAG, "oldDist=" + oldDist);
if (oldDist > 5f) {
savedMatrix.set(matrix);
midPoint(mid, event);
mode = ZOOM;
Log.d(TAG, "mode=ZOOM");
}
break;
case MotionEvent.ACTION_MOVE:
if (mode == DRAG)
{
matrix.set(savedMatrix);
matrix.postTranslate(event.getX() - start.x, event.getY() - start.y); // create the transformation in the matrix of points
}
else if (mode == ZOOM)
{
// pinch zooming
float newDist = spacing(event);
Log.d(TAG, "newDist=" + newDist);
if (newDist > 5f)
{
matrix.set(savedMatrix);
scale = newDist / oldDist; // setting the scaling of the
// matrix...if scale > 1 means
// zoom in...if scale < 1 means
// zoom out
matrix.postScale(scale, scale, mid.x, mid.y);
}
}
break;
}
view.setImageMatrix(matrix); // display the transformation on screen
return true; // indicate event was handled
}
/*
* --------------------------------------------------------------------------
* Method: spacing Parameters: MotionEvent Returns: float Description:
* checks the spacing between the two fingers on touch
* ----------------------------------------------------
*/
private float spacing(MotionEvent event)
{
float x = event.getX(0) - event.getX(1);
float y = event.getY(0) - event.getY(1);
return (float) Math.sqrt(x * x + y * y);
}
/*
* --------------------------------------------------------------------------
* Method: midPoint Parameters: PointF object, MotionEvent Returns: void
* Description: calculates the midpoint between the two fingers
* ------------------------------------------------------------
*/
private void midPoint(PointF point, MotionEvent event)
{
float x = event.getX(0) + event.getX(1);
float y = event.getY(0) + event.getY(1);
point.set(x / 2, y / 2);
}
/** Show an event in the LogCat view, for debugging */
private void dumpEvent(MotionEvent event)
{
String names[] = { "DOWN", "UP", "MOVE", "CANCEL", "OUTSIDE","POINTER_DOWN", "POINTER_UP", "7?", "8?", "9?" };
StringBuilder sb = new StringBuilder();
int action = event.getAction();
int actionCode = action & MotionEvent.ACTION_MASK;
sb.append("event ACTION_").append(names[actionCode]);
if (actionCode == MotionEvent.ACTION_POINTER_DOWN || actionCode == MotionEvent.ACTION_POINTER_UP)
{
sb.append("(pid ").append(action >> MotionEvent.ACTION_POINTER_ID_SHIFT);
sb.append(")");
}
sb.append("[");
for (int i = 0; i < event.getPointerCount(); i++)
{
sb.append("#").append(i);
sb.append("(pid ").append(event.getPointerId(i));
sb.append(")=").append((int) event.getX(i));
sb.append(",").append((int) event.getY(i));
if (i + 1 < event.getPointerCount())
sb.append(";");
}
sb.append("]");
Log.d("Touch Events ---------", sb.toString());
}
}
ここでの他の実装にはすべて、何らかの欠陥があります。だから基本的にそれらを混ぜてこれを思いついた。
次のようなカスタムビューを作成します。
ZoomableImageView.Java：
import Android.content.Context;
import Android.graphics.Bitmap;
import Android.graphics.Matrix;
import Android.graphics.PointF;
import Android.util.AttributeSet;
import Android.view.MotionEvent;
import Android.view.ScaleGestureDetector;
import Android.view.View;
import Android.widget.ImageView;
public class ZoomableImageView extends ImageView
{
Matrix matrix = new Matrix();
static final int NONE = 0;
static final int DRAG = 1;
static final int ZOOM = 2;
static final int CLICK = 3;
int mode = NONE;
PointF last = new PointF();
PointF start = new PointF();
float minScale = 1f;
float maxScale = 4f;
float[] m;
float redundantXSpace, redundantYSpace;
float width, height;
float saveScale = 1f;
float right, bottom, origWidth, origHeight, bmWidth, bmHeight;
ScaleGestureDetector mScaleDetector;
Context context;
public ZoomableImageView(Context context, AttributeSet attr)
{
super(context, attr);
super.setClickable(true);
this.context = context;
mScaleDetector = new ScaleGestureDetector(context, new ScaleListener());
matrix.setTranslate(1f, 1f);
m = new float[9];
setImageMatrix(matrix);
setScaleType(ScaleType.MATRIX);
setOnTouchListener(new OnTouchListener()
{
@Override
public boolean onTouch(View v, MotionEvent event)
{
mScaleDetector.onTouchEvent(event);
matrix.getValues(m);
float x = m[Matrix.MTRANS_X];
float y = m[Matrix.MTRANS_Y];
PointF curr = new PointF(event.getX(), event.getY());
switch (event.getAction())
{
//when one finger is touching
//set the mode to DRAG
case MotionEvent.ACTION_DOWN:
last.set(event.getX(), event.getY());
start.set(last);
mode = DRAG;
break;
//when two fingers are touching
//set the mode to ZOOM
case MotionEvent.ACTION_POINTER_DOWN:
last.set(event.getX(), event.getY());
start.set(last);
mode = ZOOM;
break;
//when a finger moves
//If mode is applicable move image
case MotionEvent.ACTION_MOVE:
//if the mode is ZOOM or
//if the mode is DRAG and already zoomed
if (mode == ZOOM || (mode == DRAG && saveScale > minScale))
{
float deltaX = curr.x - last.x;// x difference
float deltaY = curr.y - last.y;// y difference
float scaleWidth = Math.round(origWidth * saveScale);// width after applying current scale
float scaleHeight = Math.round(origHeight * saveScale);// height after applying current scale
//if scaleWidth is smaller than the views width
//in other words if the image width fits in the view
//limit left and right movement
if (scaleWidth < width)
{
deltaX = 0;
if (y + deltaY > 0)
deltaY = -y;
else if (y + deltaY < -bottom)
deltaY = -(y + bottom);
}
//if scaleHeight is smaller than the views height
//in other words if the image height fits in the view
//limit up and down movement
else if (scaleHeight < height)
{
deltaY = 0;
if (x + deltaX > 0)
deltaX = -x;
else if (x + deltaX < -right)
deltaX = -(x + right);
}
//if the image doesnt fit in the width or height
//limit both up and down and left and right
else
{
if (x + deltaX > 0)
deltaX = -x;
else if (x + deltaX < -right)
deltaX = -(x + right);
if (y + deltaY > 0)
deltaY = -y;
else if (y + deltaY < -bottom)
deltaY = -(y + bottom);
}
//move the image with the matrix
matrix.postTranslate(deltaX, deltaY);
//set the last touch location to the current
last.set(curr.x, curr.y);
}
break;
//first finger is lifted
case MotionEvent.ACTION_UP:
mode = NONE;
int xDiff = (int) Math.abs(curr.x - start.x);
int yDiff = (int) Math.abs(curr.y - start.y);
if (xDiff < CLICK && yDiff < CLICK)
performClick();
break;
// second finger is lifted
case MotionEvent.ACTION_POINTER_UP:
mode = NONE;
break;
}
setImageMatrix(matrix);
invalidate();
return true;
}
});
}
@Override
public void setImageBitmap(Bitmap bm)
{
super.setImageBitmap(bm);
bmWidth = bm.getWidth();
bmHeight = bm.getHeight();
}
public void setMaxZoom(float x)
{
maxScale = x;
}
private class ScaleListener extends ScaleGestureDetector.SimpleOnScaleGestureListener
{
@Override
public boolean onScaleBegin(ScaleGestureDetector detector)
{
mode = ZOOM;
return true;
}
@Override
public boolean onScale(ScaleGestureDetector detector)
{
float mScaleFactor = detector.getScaleFactor();
float origScale = saveScale;
saveScale *= mScaleFactor;
if (saveScale > maxScale)
{
saveScale = maxScale;
mScaleFactor = maxScale / origScale;
}
else if (saveScale < minScale)
{
saveScale = minScale;
mScaleFactor = minScale / origScale;
}
right = width * saveScale - width - (2 * redundantXSpace * saveScale);
bottom = height * saveScale - height - (2 * redundantYSpace * saveScale);
if (origWidth * saveScale <= width || origHeight * saveScale <= height)
{
matrix.postScale(mScaleFactor, mScaleFactor, width / 2, height / 2);
if (mScaleFactor < 1)
{
matrix.getValues(m);
float x = m[Matrix.MTRANS_X];
float y = m[Matrix.MTRANS_Y];
if (mScaleFactor < 1)
{
if (Math.round(origWidth * saveScale) < width)
{
if (y < -bottom)
matrix.postTranslate(0, -(y + bottom));
else if (y > 0)
matrix.postTranslate(0, -y);
}
else
{
if (x < -right)
matrix.postTranslate(-(x + right), 0);
else if (x > 0)
matrix.postTranslate(-x, 0);
}
}
}
}
else
{
matrix.postScale(mScaleFactor, mScaleFactor, detector.getFocusX(), detector.getFocusY());
matrix.getValues(m);
float x = m[Matrix.MTRANS_X];
float y = m[Matrix.MTRANS_Y];
if (mScaleFactor < 1) {
if (x < -right)
matrix.postTranslate(-(x + right), 0);
else if (x > 0)
matrix.postTranslate(-x, 0);
if (y < -bottom)
matrix.postTranslate(0, -(y + bottom));
else if (y > 0)
matrix.postTranslate(0, -y);
}
}
return true;
}
}
@Override
protected void onMeasure (int widthMeasureSpec, int heightMeasureSpec)
{
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
width = MeasureSpec.getSize(widthMeasureSpec);
height = MeasureSpec.getSize(heightMeasureSpec);
//Fit to screen.
float scale;
float scaleX = width / bmWidth;
float scaleY = height / bmHeight;
scale = Math.min(scaleX, scaleY);
matrix.setScale(scale, scale);
setImageMatrix(matrix);
saveScale = 1f;
// Center the image
redundantYSpace = height - (scale * bmHeight) ;
redundantXSpace = width - (scale * bmWidth);
redundantYSpace /= 2;
redundantXSpace /= 2;
matrix.postTranslate(redundantXSpace, redundantYSpace);
origWidth = width - 2 * redundantXSpace;
origHeight = height - 2 * redundantYSpace;
right = width * saveScale - width - (2 * redundantXSpace * saveScale);
bottom = height * saveScale - height - (2 * redundantYSpace * saveScale);
setImageMatrix(matrix);
}
}
次に、このような画像を追加します。
ZoomableImageView touch = (ZoomableImageView)findViewById(R.id.IMAGEID);
touch.setImageBitmap(bitmap);
次のようなビューをXMLで追加します。
<PACKAGE.ZoomableImageView
Android:id="@+id/IMAGEID"
Android:layout_width="match_parent"
Android:layout_height="match_parent"/>
簡単な方法：
PhotoViewAttacher pAttacher;
pAttacher = new PhotoViewAttacher(Your_Image_View);
pAttacher.update();
build.gradleに次の行を追加します。
compile 'com.commit451:PhotoView:1.2.4'
このクラスを使用してください： TouchImageView
これは、Nicolas Tylerが投稿したコードに基づくもう1つの実装です。
次のバグが修正されました。
minScaleを1未満の数値に設定するようになりましたsetImageBitmap()を使用して画像を設定する必要はありません（たとえば、setImageResource()を使用できます）- すべてのコンストラクターが正しく機能するようになりました
とりわけ、次のものが整理されています。
OnTouchListenerは使用されません。クラスはonTouchEvent()メソッドを実装するだけなので、必要ありません。right = width * saveScale - width - (2 * redundantXSpace * saveScale);の割り当てはright = (originalBitmapWidth * saveScale) - widthに簡素化されました。これは、私のオプションでは、それほど混乱しません。- いくつかのメンバー変数が削除されます（おそらく、このクラスからより多くの状態を削除できます）
それは完璧ではありませんが、ここに行きます：
import Android.content.Context;
import Android.graphics.Matrix;
import Android.graphics.PointF;
import Android.graphics.drawable.Drawable;
import Android.util.AttributeSet;
import Android.view.MotionEvent;
import Android.view.ScaleGestureDetector;
import Android.widget.ImageView;
/**
* Created by alex on 23/02/16.
* Based on code posted by Nicolas Tyler here:
* https://stackoverflow.com/questions/6650398/Android-imageview-zoom-in-and-zoom-out
*/
public class ZoomableImageView extends ImageView {
private class ScaleListener extends ScaleGestureDetector.SimpleOnScaleGestureListener {
@Override
public boolean onScaleBegin(ScaleGestureDetector detector) {
mode = ZOOM;
return true;
}
@Override
public boolean onScale(ScaleGestureDetector detector) {
float scaleFactor = detector.getScaleFactor();
float newScale = saveScale * scaleFactor;
if (newScale < maxScale && newScale > minScale) {
saveScale = newScale;
float width = getWidth();
float height = getHeight();
right = (originalBitmapWidth * saveScale) - width;
bottom = (originalBitmapHeight * saveScale) - height;
float scaledBitmapWidth = originalBitmapWidth * saveScale;
float scaledBitmapHeight = originalBitmapHeight * saveScale;
if (scaledBitmapWidth <= width || scaledBitmapHeight <= height) {
matrix.postScale(scaleFactor, scaleFactor, width / 2, height / 2);
} else {
matrix.postScale(scaleFactor, scaleFactor, detector.getFocusX(), detector.getFocusY());
}
}
return true;
}
}
static final int NONE = 0;
static final int DRAG = 1;
static final int ZOOM = 2;
static final int CLICK = 3;
private int mode = NONE;
private Matrix matrix = new Matrix();
private PointF last = new PointF();
private PointF start = new PointF();
private float minScale = 0.5f;
private float maxScale = 4f;
private float[] m;
private float redundantXSpace, redundantYSpace;
private float saveScale = 1f;
private float right, bottom, originalBitmapWidth, originalBitmapHeight;
private ScaleGestureDetector mScaleDetector;
public ZoomableImageView(Context context) {
super(context);
init(context);
}
public ZoomableImageView(Context context, AttributeSet attrs) {
super(context, attrs);
init(context);
}
public ZoomableImageView(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
init(context);
}
private void init(Context context) {
super.setClickable(true);
mScaleDetector = new ScaleGestureDetector(context, new ScaleListener());
m = new float[9];
setImageMatrix(matrix);
setScaleType(ScaleType.MATRIX);
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
int bmHeight = getBmHeight();
int bmWidth = getBmWidth();
float width = getMeasuredWidth();
float height = getMeasuredHeight();
//Fit to screen.
float scale = width > height ? height / bmHeight : width / bmWidth;
matrix.setScale(scale, scale);
saveScale = 1f;
originalBitmapWidth = scale * bmWidth;
originalBitmapHeight = scale * bmHeight;
// Center the image
redundantYSpace = (height - originalBitmapHeight);
redundantXSpace = (width - originalBitmapWidth);
matrix.postTranslate(redundantXSpace / 2, redundantYSpace / 2);
setImageMatrix(matrix);
}
@Override
public boolean onTouchEvent(MotionEvent event) {
mScaleDetector.onTouchEvent(event);
matrix.getValues(m);
float x = m[Matrix.MTRANS_X];
float y = m[Matrix.MTRANS_Y];
PointF curr = new PointF(event.getX(), event.getY());
switch (event.getAction()) {
//when one finger is touching
//set the mode to DRAG
case MotionEvent.ACTION_DOWN:
last.set(event.getX(), event.getY());
start.set(last);
mode = DRAG;
break;
//when two fingers are touching
//set the mode to ZOOM
case MotionEvent.ACTION_POINTER_DOWN:
last.set(event.getX(), event.getY());
start.set(last);
mode = ZOOM;
break;
//when a finger moves
//If mode is applicable move image
case MotionEvent.ACTION_MOVE:
//if the mode is ZOOM or
//if the mode is DRAG and already zoomed
if (mode == ZOOM || (mode == DRAG && saveScale > minScale)) {
float deltaX = curr.x - last.x;// x difference
float deltaY = curr.y - last.y;// y difference
float scaleWidth = Math.round(originalBitmapWidth * saveScale);// width after applying current scale
float scaleHeight = Math.round(originalBitmapHeight * saveScale);// height after applying current scale
boolean limitX = false;
boolean limitY = false;
//if scaleWidth is smaller than the views width
//in other words if the image width fits in the view
//limit left and right movement
if (scaleWidth < getWidth() && scaleHeight < getHeight()) {
// don't do anything
}
else if (scaleWidth < getWidth()) {
deltaX = 0;
limitY = true;
}
//if scaleHeight is smaller than the views height
//in other words if the image height fits in the view
//limit up and down movement
else if (scaleHeight < getHeight()) {
deltaY = 0;
limitX = true;
}
//if the image doesnt fit in the width or height
//limit both up and down and left and right
else {
limitX = true;
limitY = true;
}
if (limitY) {
if (y + deltaY > 0) {
deltaY = -y;
} else if (y + deltaY < -bottom) {
deltaY = -(y + bottom);
}
}
if (limitX) {
if (x + deltaX > 0) {
deltaX = -x;
} else if (x + deltaX < -right) {
deltaX = -(x + right);
}
}
//move the image with the matrix
matrix.postTranslate(deltaX, deltaY);
//set the last touch location to the current
last.set(curr.x, curr.y);
}
break;
//first finger is lifted
case MotionEvent.ACTION_UP:
mode = NONE;
int xDiff = (int) Math.abs(curr.x - start.x);
int yDiff = (int) Math.abs(curr.y - start.y);
if (xDiff < CLICK && yDiff < CLICK)
performClick();
break;
// second finger is lifted
case MotionEvent.ACTION_POINTER_UP:
mode = NONE;
break;
}
setImageMatrix(matrix);
invalidate();
return true;
}
public void setMaxZoom(float x) {
maxScale = x;
}
private int getBmWidth() {
Drawable drawable = getDrawable();
if (drawable != null) {
return drawable.getIntrinsicWidth();
}
return 0;
}
private int getBmHeight() {
Drawable drawable = getDrawable();
if (drawable != null) {
return drawable.getIntrinsicHeight();
}
return 0;
}
}
完璧なZOOM（2本の指）/ ROTATION（2本の指）/ DRAG（1本の指）のスタックから得た答えを改善しました。
// ============================ XMLコード==================
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:Android="http://schemas.Android.com/apk/res/Android"
xmlns:app="http://schemas.Android.com/apk/res-auto"
xmlns:tools="http://schemas.Android.com/tools"
Android:layout_width="match_parent"
Android:layout_height="match_parent"
tools:context="com.example.flochat.imageviewzoomforstack.MainActivity">
<ImageView
Android:id="@+id/imageview_trash"
Android:layout_width="wrap_content"
Android:layout_height="wrap_content"
Android:src="@drawable/trash" />
</LinearLayout>
// ============================ Javaコード================== =========
public class MainActivity extends AppCompatActivity {
ImageView photoview2;
float[] lastEvent = null;
float d = 0f;
float newRot = 0f;
private boolean isZoomAndRotate;
private boolean isOutSide;
private static final int NONE = 0;
private static final int DRAG = 1;
private static final int ZOOM = 2;
private int mode = NONE;
private PointF start = new PointF();
private PointF mid = new PointF();
float oldDist = 1f;
private float xCoOrdinate, yCoOrdinate;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
WindowManager.LayoutParams.FLAG_FULLSCREEN);
setContentView(R.layout.activity_main);
photoview2 = findViewById(R.id.imageview_trash);
photoview2.setOnTouchListener(new View.OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
ImageView view = (ImageView) v;
view.bringToFront();
viewTransformation(view, event);
return true;
}
});
}
private void viewTransformation(View view, MotionEvent event) {
switch (event.getAction() & MotionEvent.ACTION_MASK) {
case MotionEvent.ACTION_DOWN:
xCoOrdinate = view.getX() - event.getRawX();
yCoOrdinate = view.getY() - event.getRawY();
start.set(event.getX(), event.getY());
isOutSide = false;
mode = DRAG;
lastEvent = null;
break;
case MotionEvent.ACTION_POINTER_DOWN:
oldDist = spacing(event);
if (oldDist > 10f) {
midPoint(mid, event);
mode = ZOOM;
}
lastEvent = new float[4];
lastEvent[0] = event.getX(0);
lastEvent[1] = event.getX(1);
lastEvent[2] = event.getY(0);
lastEvent[3] = event.getY(1);
d = rotation(event);
break;
case MotionEvent.ACTION_UP:
isZoomAndRotate = false;
if (mode == DRAG) {
float x = event.getX();
float y = event.getY();
}
case MotionEvent.ACTION_OUTSIDE:
isOutSide = true;
mode = NONE;
lastEvent = null;
case MotionEvent.ACTION_POINTER_UP:
mode = NONE;
lastEvent = null;
break;
case MotionEvent.ACTION_MOVE:
if (!isOutSide) {
if (mode == DRAG) {
isZoomAndRotate = false;
view.animate().x(event.getRawX() + xCoOrdinate).y(event.getRawY() + yCoOrdinate).setDuration(0).start();
}
if (mode == ZOOM && event.getPointerCount() == 2) {
float newDist1 = spacing(event);
if (newDist1 > 10f) {
float scale = newDist1 / oldDist * view.getScaleX();
view.setScaleX(scale);
view.setScaleY(scale);
}
if (lastEvent != null) {
newRot = rotation(event);
view.setRotation((float) (view.getRotation() + (newRot - d)));
}
}
}
break;
}
}
private float rotation(MotionEvent event) {
double delta_x = (event.getX(0) - event.getX(1));
double delta_y = (event.getY(0) - event.getY(1));
double radians = Math.atan2(delta_y, delta_x);
return (float) Math.toDegrees(radians);
}
private float spacing(MotionEvent event) {
float x = event.getX(0) - event.getX(1);
float y = event.getY(0) - event.getY(1);
return (int) Math.sqrt(x * x + y * y);
}
private void midPoint(PointF point, MotionEvent event) {
float x = event.getX(0) + event.getX(1);
float y = event.getY(0) + event.getY(1);
point.set(x / 2, y / 2);
}
}
// ========================ズーム/回転/ドラッグしたいビューをviewTransformation（）メソッドに渡すだけです。 textviewズームに非常に適しています。テキストをピクセル化しません。
ピンチズームで独自のカスタム画像ビューを作成しました。 Chirag Raval sコードには制限/境界がないため、ユーザーは画面から画像をドラッグできます。
CustomImageViewクラスは次のとおりです。
public class CustomImageVIew extends ImageView implements OnTouchListener {
private Matrix matrix = new Matrix();
private Matrix savedMatrix = new Matrix();
static final int NONE = 0;
static final int DRAG = 1;
static final int ZOOM = 2;
private int mode = NONE;
private PointF mStartPoint = new PointF();
private PointF mMiddlePoint = new PointF();
private Point mBitmapMiddlePoint = new Point();
private float oldDist = 1f;
private float matrixValues[] = {0f, 0f, 0f, 0f, 0f, 0f, 0f, 0f, 0f};
private float scale;
private float oldEventX = 0;
private float oldEventY = 0;
private float oldStartPointX = 0;
private float oldStartPointY = 0;
private int mViewWidth = -1;
private int mViewHeight = -1;
private int mBitmapWidth = -1;
private int mBitmapHeight = -1;
private boolean mDraggable = false;
public CustomImageVIew(Context context) {
this(context, null, 0);
}
public CustomImageVIew(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public CustomImageVIew(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
this.setOnTouchListener(this);
}
@Override
public void onSizeChanged (int w, int h, int oldw, int oldh){
super.onSizeChanged(w, h, oldw, oldh);
mViewWidth = w;
mViewHeight = h;
}
public void setBitmap(Bitmap bitmap){
if(bitmap != null){
setImageBitmap(bitmap);
mBitmapWidth = bitmap.getWidth();
mBitmapHeight = bitmap.getHeight();
mBitmapMiddlePoint.x = (mViewWidth / 2) - (mBitmapWidth / 2);
mBitmapMiddlePoint.y = (mViewHeight / 2) - (mBitmapHeight / 2);
matrix.postTranslate(mBitmapMiddlePoint.x, mBitmapMiddlePoint.y);
this.setImageMatrix(matrix);
}
}
@Override
public boolean onTouch(View v, MotionEvent event){
switch (event.getAction() & MotionEvent.ACTION_MASK) {
case MotionEvent.ACTION_DOWN:
savedMatrix.set(matrix);
mStartPoint.set(event.getX(), event.getY());
mode = DRAG;
break;
case MotionEvent.ACTION_POINTER_DOWN:
oldDist = spacing(event);
if(oldDist > 10f){
savedMatrix.set(matrix);
midPoint(mMiddlePoint, event);
mode = ZOOM;
}
break;
case MotionEvent.ACTION_UP:
case MotionEvent.ACTION_POINTER_UP:
mode = NONE;
break;
case MotionEvent.ACTION_MOVE:
if(mode == DRAG){
drag(event);
} else if(mode == ZOOM){
zoom(event);
}
break;
}
return true;
}
public void drag(MotionEvent event){
matrix.getValues(matrixValues);
float left = matrixValues[2];
float top = matrixValues[5];
float bottom = (top + (matrixValues[0] * mBitmapHeight)) - mViewHeight;
float right = (left + (matrixValues[0] * mBitmapWidth)) -mViewWidth;
float eventX = event.getX();
float eventY = event.getY();
float spacingX = eventX - mStartPoint.x;
float spacingY = eventY - mStartPoint.y;
float newPositionLeft = (left < 0 ? spacingX : spacingX * -1) + left;
float newPositionRight = (spacingX) + right;
float newPositionTop = (top < 0 ? spacingY : spacingY * -1) + top;
float newPositionBottom = (spacingY) + bottom;
boolean x = true;
boolean y = true;
if(newPositionRight < 0.0f || newPositionLeft > 0.0f){
if(newPositionRight < 0.0f && newPositionLeft > 0.0f){
x = false;
} else{
eventX = oldEventX;
mStartPoint.x = oldStartPointX;
}
}
if(newPositionBottom < 0.0f || newPositionTop > 0.0f){
if(newPositionBottom < 0.0f && newPositionTop > 0.0f){
y = false;
} else{
eventY = oldEventY;
mStartPoint.y = oldStartPointY;
}
}
if(mDraggable){
matrix.set(savedMatrix);
matrix.postTranslate(x? eventX - mStartPoint.x : 0, y? eventY - mStartPoint.y : 0);
this.setImageMatrix(matrix);
if(x)oldEventX = eventX;
if(y)oldEventY = eventY;
if(x)oldStartPointX = mStartPoint.x;
if(y)oldStartPointY = mStartPoint.y;
}
}
public void zoom(MotionEvent event){
matrix.getValues(matrixValues);
float newDist = spacing(event);
float bitmapWidth = matrixValues[0] * mBitmapWidth;
float bimtapHeight = matrixValues[0] * mBitmapHeight;
boolean in = newDist > oldDist;
if(!in && matrixValues[0] < 1){
return;
}
if(bitmapWidth > mViewWidth || bimtapHeight > mViewHeight){
mDraggable = true;
} else{
mDraggable = false;
}
float midX = (mViewWidth / 2);
float midY = (mViewHeight / 2);
matrix.set(savedMatrix);
scale = newDist / oldDist;
matrix.postScale(scale, scale, bitmapWidth > mViewWidth ? mMiddlePoint.x : midX, bimtapHeight > mViewHeight ? mMiddlePoint.y : midY);
this.setImageMatrix(matrix);
}
/** Determine the space between the first two fingers */
private float spacing(MotionEvent event) {
float x = event.getX(0) - event.getX(1);
float y = event.getY(0) - event.getY(1);
return (float)Math.sqrt(x * x + y * y);
}
/** Calculate the mid point of the first two fingers */
private void midPoint(PointF point, MotionEvent event) {
float x = event.getX(0) + event.getX(1);
float y = event.getY(0) + event.getY(1);
point.set(x / 2, y / 2);
}
}
これはあなたの活動でそれを使用する方法です：
CustomImageVIew mImageView = (CustomImageVIew)findViewById(R.id.customImageVIew1);
mImage.setBitmap(your bitmap);
そしてレイアウト：
<your.package.name.CustomImageVIew
Android:id="@+id/customImageVIew1"
Android:layout_width="fill_parent"
Android:layout_height="fill_parent"
Android:layout_marginBottom="15dp"
Android:layout_marginLeft="15dp"
Android:layout_marginRight="15dp"
Android:layout_marginTop="15dp"
Android:layout_centerHorizontal="true"
Android:layout_centerVertical="true"
Android:scaleType="matrix"/> // important
チラグ・ラバルズの答えは素晴らしいと思います！
改善できる唯一のことは、このコードを次のようなクラス内に移動することです。
PinchZoomImageView extends ImageView {...
最初のタップ後のズームを防ぐために、初期イメージマトリックス初期化を追加します。
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
matrix = new Matrix(this.getImageMatrix());
}
ところで、これはMuhammad UmarとBazが言及したバグを修正します
追伸最大および最小ズーム制限を持つことも有用です。たとえば、最大ズームは2倍であり、最小ズームは画像が画面にフィットするときの元のスケールです：
static final int MAX_SCALE_FACTOR = 2;
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
// Getting initial Image matrix
mViewMatrix = new Matrix(this.getImageMatrix());
mMinScaleMatrix = new Matrix(mViewMatrix);
float initialScale = getMatrixScale(mViewMatrix);
if (initialScale < 1.0f) // Image is bigger than screen
mMaxScale = MAX_SCALE_FACTOR;
else
mMaxScale = MAX_SCALE_FACTOR * initialScale;
mMinScale = getMatrixScale(mMinScaleMatrix);
}
@Override
public boolean onTouch(View v, MotionEvent event) {
ImageView view = (ImageView) v;
// We set scale only after onMeasure was called and automatically fit image to screen
if(!mWasScaleTypeSet) {
view.setScaleType(ImageView.ScaleType.MATRIX);
mWasScaleTypeSet = true;
}
float scale;
dumpEvent(event);
switch (event.getAction() & MotionEvent.ACTION_MASK) {
case MotionEvent.ACTION_DOWN: // first finger down only
mCurSavedMatrix.set(mViewMatrix);
start.set(event.getX(), event.getY());
mCurrentMode = DRAG;
break;
case MotionEvent.ACTION_UP: // first finger lifted
case MotionEvent.ACTION_POINTER_UP: // second finger lifted
mCurrentMode = NONE;
float resScale = getMatrixScale(mViewMatrix);
if (resScale > mMaxScale) {
downscaleMatrix(resScale, mViewMatrix);
} else if (resScale < mMinScale)
mViewMatrix = new Matrix(mMinScaleMatrix);
else if ((resScale - mMinScale) < 0.1f) // Don't allow user to drag picture outside in case of FIT TO WINDOW zoom
mViewMatrix = new Matrix(mMinScaleMatrix);
else
break;
break;
case MotionEvent.ACTION_POINTER_DOWN: // first and second finger down
mOldDist = spacing(event);
Helper.LOGD(TAG, "oldDist=" + mOldDist);
if (mOldDist > 5f) {
mCurSavedMatrix.set(mViewMatrix);
midPoint(mCurMidPoint, event);
mCurrentMode = ZOOM;
Helper.LOGD(TAG, "mode=ZOOM");
}
break;
case MotionEvent.ACTION_MOVE:
if (mCurrentMode == DRAG) {
mViewMatrix.set(mCurSavedMatrix);
mViewMatrix.postTranslate(event.getX() - start.x, event.getY() - start.y); // create the transformation in the matrix of points
} else if (mCurrentMode == ZOOM) {
// pinch zooming
float newDist = spacing(event);
Helper.LOGD(TAG, "newDist=" + newDist);
if (newDist > 1.f) {
mViewMatrix.set(mCurSavedMatrix);
scale = newDist / mOldDist; // setting the scaling of the
// matrix...if scale > 1 means
// zoom in...if scale < 1 means
// zoom out
mViewMatrix.postScale(scale, scale, mCurMidPoint.x, mCurMidPoint.y);
}
}
break;
}
view.setImageMatrix(mViewMatrix); // display the transformation on screen
return true; // indicate event was handled
}
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////// PRIVATE SECTION ///////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// These matrices will be used to scale points of the image
private Matrix mViewMatrix = new Matrix();
private Matrix mCurSavedMatrix = new Matrix();
// These PointF objects are used to record the point(s) the user is touching
private PointF start = new PointF();
private PointF mCurMidPoint = new PointF();
private float mOldDist = 1f;
private Matrix mMinScaleMatrix;
private float mMinScale;
private float mMaxScale;
float[] mTmpValues = new float[9];
private boolean mWasScaleTypeSet;
/**
* Returns scale factor of the Matrix
* @param matrix
* @return
*/
private float getMatrixScale(Matrix matrix) {
matrix.getValues(mTmpValues);
return mTmpValues[Matrix.MSCALE_X];
}
/**
* Downscales matrix with the scale to maximum allowed scale factor, but the same translations
* @param scale
* @param dist
*/
private void downscaleMatrix(float scale, Matrix dist) {
float resScale = mMaxScale / scale;
dist.postScale(resScale, resScale, mCurMidPoint.x, mCurMidPoint.y);
}
このコードは機能し、ダブルタップを実装して元の画像サイズに戻します。
最初のステップ-xmlレイアウトで次のようにします：
<com.****.*****.TouchImageView
Android:id="@+id/action_infolinks_splash"
Android:layout_width="match_parent"
Android:layout_height="match_parent"
Android:src="@mipmap/myinfolinks_splash"
Android:layout_gravity="center"
Android:gravity="center"
Android:scaleType="fitCenter"
Android:contentDescription="@string/aboutSupport_description_image"/>
2番目のステップ-TouchImageViewクラスを使用してファイル（TouchImageView.Java）を作成します。
import Android.content.Context;
import Android.graphics.Bitmap;
import Android.graphics.BitmapFactory;
import Android.graphics.Matrix;
import Android.graphics.PointF;
import Android.util.AttributeSet;
import Android.view.GestureDetector;
import Android.view.MotionEvent;
import Android.view.ScaleGestureDetector;
import Android.view.View;
import Android.widget.ImageView;
public class TouchImageView extends ImageView {
Matrix matrix;
// We can be in one of these 3 states
static final int NONE = 0;
static final int DRAG = 1;
static final int ZOOM = 2;
int mode = NONE;
// Remember some things for zooming
PointF last = new PointF();
PointF start = new PointF();
float minScale = 1f;
float maxScale = 3f;
float[] m;
float redundantXSpace, redundantYSpace, origRedundantXSpace, origRedundantYSpace;
int viewWidth, viewHeight;
static final int CLICK = 3;
static final float SAVE_SCALE = 1f;
float saveScale = SAVE_SCALE;
protected float origWidth, origHeight;
int oldMeasuredWidth, oldMeasuredHeight;
float origScale, bottom, origBottom, right, origRight;
ScaleGestureDetector mScaleDetector;
GestureDetector mGestureDetector;
Context context;
public TouchImageView(Context context) {
super(context);
sharedConstructing(context);
}
public TouchImageView(Context context, AttributeSet attrs) {
super(context, attrs);
sharedConstructing(context);
}
private void sharedConstructing(Context context) {
super.setClickable(true);
this.context = context;
mScaleDetector = new ScaleGestureDetector(context, new ScaleListener());
matrix = new Matrix();
m = new float[9];
setImageMatrix(matrix);
setScaleType(ScaleType.MATRIX);
setOnTouchListener(new OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
boolean onDoubleTapEvent = mGestureDetector.onTouchEvent(event);
if (onDoubleTapEvent) {
// Reset Image to original scale values
mode = NONE;
bottom = origBottom;
right = origRight;
last = new PointF();
start = new PointF();
m = new float[9];
saveScale = SAVE_SCALE;
matrix = new Matrix();
matrix.setScale(origScale, origScale);
matrix.postTranslate(origRedundantXSpace, origRedundantYSpace);
setImageMatrix(matrix);
invalidate();
return true;
}
mScaleDetector.onTouchEvent(event);
PointF curr = new PointF(event.getX(), event.getY());
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
last.set(curr);
start.set(last);
mode = DRAG;
break;
case MotionEvent.ACTION_MOVE:
if (mode == DRAG) {
float deltaX = curr.x - last.x;
float deltaY = curr.y - last.y;
float fixTransX = getFixDragTrans(deltaX, viewWidth, origWidth * saveScale);
float fixTransY = getFixDragTrans(deltaY, viewHeight, origHeight * saveScale);
matrix.postTranslate(fixTransX, fixTransY);
fixTrans();
last.set(curr.x, curr.y);
}
break;
case MotionEvent.ACTION_UP:
mode = NONE;
int xDiff = (int) Math.abs(curr.x - start.x);
int yDiff = (int) Math.abs(curr.y - start.y);
if (xDiff < CLICK && yDiff < CLICK) performClick();
break;
case MotionEvent.ACTION_POINTER_UP:
mode = NONE;
break;
}
setImageMatrix(matrix);
invalidate();
return true; // indicate event was handled
}
});
mGestureDetector = new GestureDetector(context, new GestureDetector.SimpleOnGestureListener() {
@Override
public boolean onDoubleTapEvent(MotionEvent e) {
return true;
}
});
}
public void setMaxZoom(float x) {
maxScale = x;
}
private class ScaleListener extends ScaleGestureDetector.SimpleOnScaleGestureListener {
@Override
public boolean onScaleBegin(ScaleGestureDetector detector) {
mode = ZOOM;
return true;
}
@Override
public boolean onScale(ScaleGestureDetector detector) {
float mScaleFactor = detector.getScaleFactor();
//float mScaleFactor = (float) Math.min(Math.max(.95f, detector.getScaleFactor()), 1.05);
float origScale = saveScale;
saveScale *= mScaleFactor;
if (saveScale > maxScale) {
saveScale = maxScale;
mScaleFactor = maxScale / origScale;
} else if (saveScale < minScale) {
saveScale = minScale;
mScaleFactor = minScale / origScale;
}
right = viewWidth * saveScale - viewWidth - (2 * redundantXSpace * saveScale);
bottom = viewHeight * saveScale - viewHeight - (2 * redundantYSpace * saveScale);
if (origWidth * saveScale <= viewWidth || origHeight * saveScale <= viewHeight)
matrix.postScale(mScaleFactor, mScaleFactor, viewWidth / 2, viewHeight / 2);
else
matrix.postScale(mScaleFactor, mScaleFactor, detector.getFocusX(), detector.getFocusY());
fixTrans();
return true;
}
}
void fixTrans() {
matrix.getValues(m);
float transX = m[Matrix.MTRANS_X];
float transY = m[Matrix.MTRANS_Y];
float fixTransX = getFixTrans(transX, viewWidth, origWidth * saveScale);
float fixTransY = getFixTrans(transY, viewHeight, origHeight * saveScale);
if (fixTransX != 0 || fixTransY != 0)
matrix.postTranslate(fixTransX, fixTransY);
}
float getFixTrans(float trans, float viewSize, float contentSize) {
float minTrans, maxTrans;
if (contentSize <= viewSize) {
minTrans = 0;
maxTrans = viewSize - contentSize;
} else {
minTrans = viewSize - contentSize;
maxTrans = 0;
}
if (trans < minTrans)
return -trans + minTrans;
if (trans > maxTrans)
return -trans + maxTrans;
return 0;
}
float getFixDragTrans(float delta, float viewSize, float contentSize) {
if (contentSize <= viewSize) {
return 0;
}
return delta;
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
viewWidth = MeasureSpec.getSize(widthMeasureSpec);
viewHeight = MeasureSpec.getSize(heightMeasureSpec);
//
// Rescales image on rotation
//
if (oldMeasuredHeight == viewWidth && oldMeasuredHeight == viewHeight || viewWidth == 0 || viewHeight == 0) return;
oldMeasuredHeight = viewHeight;
oldMeasuredWidth = viewWidth;
if (saveScale == 1) {
// Fit to screen.
float scale;
int bmWidth,bmHeight;
Bitmap bm = BitmapFactory.decodeResource(context.getResources(), R.mipmap.myinfolinks_splash);
bmWidth = bm.getWidth();
bmHeight = bm.getHeight();
int w = bmWidth;
int h = bmHeight;
viewWidth = resolveSize(w, widthMeasureSpec);
viewHeight = resolveSize(h, heightMeasureSpec);
float scaleX = (float) viewWidth / (float) bmWidth;
float scaleY = (float) viewHeight / (float) bmHeight;
scale = Math.min(scaleX, scaleY);
matrix.setScale(scale, scale);
saveScale = SAVE_SCALE;
origScale = scale;
// Center the image
redundantYSpace = (float) viewHeight - (scale * (float) bmHeight);
redundantXSpace = (float) viewWidth - (scale * (float) bmWidth);
redundantYSpace /= (float) 2;
redundantXSpace /= (float) 2;
origRedundantXSpace = redundantXSpace;
origRedundantYSpace = redundantYSpace;
matrix.postTranslate(redundantXSpace, redundantYSpace);
origWidth = viewWidth - 2 * redundantXSpace;
origHeight = viewHeight - 2 * redundantYSpace;
right = viewWidth * saveScale - viewWidth - (2 * redundantXSpace * saveScale);
bottom = viewHeight * saveScale - viewHeight - (2 * redundantYSpace * saveScale);
origRight = right;
origBottom = bottom;
setImageMatrix(matrix);
}
fixTrans();
}
}
最後に、メインアクティビティで呼び出しを行います。
TouchImageView imgDisplay = (TouchImageView) messageView.findViewById(R.id.id_myImage);
imgDisplay.setMaxZoom(2f);
imgDisplay.setImageResource(R.drawable.myImage);
私はたくさんのコードを見ました、そして、私の調整の後、それは働いています。楽しい！
@Nicolas Tylerから最も役立つ回答を得ましたが、構文とロジックの動作に問題がありました。また、アルファ空間が欲しくなく、代数は錆びていました！ 3日後、私はこれを自分のバージョンにまとめました。
私の答えは、次の点で@Nicolas Tylerと異なります：
私が見つけたさまざまな変数名は、基本的なコンテキスト使用でより意味がありました
このピンチズーム画像クラスはアルファ空間を表示せず、ズームインおよびズームアウトできますが、画像のパン/アンダーパンやアルファ空間の表示はできません。
マトリックスセクションに深いコメントを追加して、関係する数学で何が起こっているかを説明しました
この画像クラスでは、resourceIdを渡すこともでき、そこからビットマップを作成します
スケーリングと変換の両方のためのはるかに単純なアルゴリズムといくつかの変数
これ内で画像を変更すると、新しい画像がビューコンテナを占有するようにズームイン/アウトします。
Algebraの優れたリソースリフレッシャーは、次の場所にあります： https://youtu.be/IiXB6tYtY4w?t=4m12s MTRANS_XとMTRANS_Yを理解してください）。質問がある場合、私は最善を尽くして回答します（ただし、代数の専門家ではありません）。
import Android.content.Context;
import Android.graphics.Bitmap;
import Android.graphics.BitmapFactory;
import Android.graphics.Matrix;
import Android.graphics.PointF;
import Android.view.MotionEvent;
import Android.view.ScaleGestureDetector;
import Android.view.View;
import Android.widget.ImageView;
public class iImage extends ImageView
{
static final int NONE_MODE = 0;
static final int DRAG_MODE = 1;
static final int ZOOM_MODE = 2;
int _mode = NONE_MODE;
Matrix _matrix = new Matrix();
PointF _previousPoint = new PointF();
PointF _startPoint = new PointF();
float _currentScale = 1f;
float _minScale = 1f;
float _maxScale = 3f;
float[] _arrayOf9Floats;
float _bitmapWidth, _bitmapHeight,_displayWidth, _displayHeight;
ScaleGestureDetector _scaleDetector;
Context _context;
public iImage(Context context)
{
super(context);
super.setClickable(true);
_context = context;
_scaleDetector = new ScaleGestureDetector(context, new ScaleListener());
_arrayOf9Floats = new float[9];
setScaleType(ScaleType.MATRIX);
setOnTouchListener(new OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
return handleTouch(v, event);
}
});
}
private boolean handleTouch(View v, MotionEvent event)
{
_scaleDetector.onTouchEvent(event);
//Contrary to how this line looks, the matrix is not setting the values from the arrayOf9Floats, but rather taking the
//matrix values and assigning them into the arrayOf9Floats. I extremely dislike this syntax and I think
//it should have been written as _arrayOf9Floats = _matrix.getValues() but that's Android for you!!!
_matrix.getValues(_arrayOf9Floats);
//Look at https://youtu.be/IiXB6tYtY4w?t=4m12s , it shows scale, rotate, and translate matrices
//If you look at the translate matrix, you'll see that the 3rd and 6th values are the values which represent x and y translations respectively
//this corresponds to the 2nd and 5th values in the array and hence why the MTRANS_X and MTRANS_Y have the constants 2 and 5 respectively
float xTranslate = _arrayOf9Floats[Matrix.MTRANS_X];
float yTranslate = _arrayOf9Floats[Matrix.MTRANS_Y];
PointF currentEventPoint = new PointF(event.getX(), event.getY());
switch (event.getAction())
{
//First finger down only
case MotionEvent.ACTION_DOWN:
_previousPoint.set(event.getX(), event.getY());
_startPoint.set(_previousPoint);
_mode = DRAG_MODE;
break;
//Second finger down
case MotionEvent.ACTION_POINTER_DOWN:
_previousPoint.set(event.getX(), event.getY());
_startPoint.set(_previousPoint);
_mode = ZOOM_MODE;
break;
case MotionEvent.ACTION_MOVE:
if (_mode == ZOOM_MODE || _mode == DRAG_MODE )
{
float deltaX = currentEventPoint.x - _previousPoint.x;
float deltaY = currentEventPoint.y - _previousPoint.y;
//In matrix terms, going right is + and going left is +
//Moving the image right past 0 means it will show alpha space on the left so we dont want that
//Keep in mind this is a TOP LEFT pivot point, so we dont want the top left to be past 0 lest we have alpha space
if(xTranslate + deltaX > 0)
{
//get absolute of how much into the negative we would have gone
float excessDeltaX = Math.abs(xTranslate + deltaX);
//take that excess away from deltaX so X wont got less than 0 after the translation
deltaX = deltaX - excessDeltaX;
}
//Going left we dont want the negative value to be less than the negative width of the Sprite, lest we get alpha space on the right
//The width is going to be the width of the bitmap * scale and we want the - of it because we are checking for left movement
//We also need to account for the width of the DISPLAY CONTAINER (i.e. _displayWidth) so that gets subtracted
//i.e. we want the max scroll width value
float maxScrollableWidth = _bitmapWidth * _currentScale - _displayWidth;
if(xTranslate + deltaX < -maxScrollableWidth)
{
//this forces the max possible translate to always match the - of maxScrollableWidth
deltaX = -maxScrollableWidth - xTranslate;
}
//repeat for Y
if(yTranslate + deltaY > 0)
{
float excessDeltaY = Math.abs(yTranslate + deltaY);
deltaY = deltaY - excessDeltaY;
}
float maxScrollableHeight = _bitmapHeight * _currentScale - _displayWidth;
if(yTranslate + deltaY < -maxScrollableHeight)
{
//this forces the max possible translate to always match the - of maxScrollableWidth
deltaY = -maxScrollableHeight - yTranslate;
}
_matrix.postTranslate(deltaX, deltaY);
_matrix.getValues(_arrayOf9Floats);
//System.out.println(_matrix);
_previousPoint.set(currentEventPoint.x, currentEventPoint.y);
}
break;
case MotionEvent.ACTION_POINTER_UP:
_mode = NONE_MODE;
break;
}
setImageMatrix(_matrix);
invalidate();
return true;
}
@Override
public void setImageBitmap(Bitmap bm)
{
super.setImageBitmap(bm);
_bitmapWidth = bm.getWidth();
_bitmapHeight = bm.getHeight();
invalidate();
}
@Override
public void setImageResource(int resid)
{
Bitmap bitmapImage = BitmapFactory.decodeResource(_context.getResources(), resid);
setImageBitmap(bitmapImage);
}
private class ScaleListener extends ScaleGestureDetector.SimpleOnScaleGestureListener
{
@Override
public boolean onScaleBegin(ScaleGestureDetector detector)
{
_mode = ZOOM_MODE;
return true;
}
@Override
public boolean onScale(ScaleGestureDetector detector)
{
float scaleFactor = detector.getScaleFactor();
float originalScale = _currentScale;
_currentScale *= scaleFactor;
//Zoom in too much
if (_currentScale > _maxScale) {
_currentScale = _maxScale;
scaleFactor = _maxScale / originalScale;
}//Zoom out too much
else if (_currentScale < _minScale) {
_currentScale = _minScale;
scaleFactor = _minScale / originalScale;
}
_matrix.postScale(scaleFactor,scaleFactor);
return true;
}
}
@Override
protected void onMeasure (int widthMeasureSpec, int heightMeasureSpec)
{
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
_displayWidth = MeasureSpec.getSize(widthMeasureSpec);
_displayHeight = MeasureSpec.getSize(heightMeasureSpec);
adjustScale();
}
private void adjustScale()
{
//Fit to display bounds with NO alpha space
float scale;
float scaleX = _displayWidth / _bitmapWidth;
float scaleY = _displayHeight / _bitmapHeight;
scale = Math.max(scaleX, scaleY);
_matrix.setScale(scale, scale);
setImageMatrix(_matrix);
_currentScale = scale;
_minScale = scale;
}
public void setMaxZoom(float maxZoom){_maxScale = maxZoom;}
public void setMinZoom(float minZoom) {_minScale = minZoom;}
}
画像をウェブビューに配置して、それを操作する必要があります。ズームイン/ズームアウトコントロールは、webviewで使用できます。
類似したものが必要でしたが、寸法を簡単に取得し、ドラッグ/ドロップする機能も必要でした。 @Nicolas Tylerが与えた答えを基に、そこから修正しました。
機能は、ピンチズームイン/アウト、長押しで振動/強調表示されたドラッグ/ドロップです。
それを使用するには、このCustomZoomViewクラスをプロジェクトに追加します。
public class CustomZoomView extends View implements View.OnTouchListener, View.OnLongClickListener{
private Paint mPaint;
Vibrator v;
static final int NONE = 0;
static final int DRAG = 1;
static final int ZOOM = 2;
static final int MOVE = 3;
private int mode = NONE;
Rect src;
Rect mTempDst = new Rect();
Rect dst = new Rect();
Bitmap mBitmap;
private int mBitmapWidth = -1;
private int mBitmapHeight = -1;
private PointF mStartPoint = new PointF();
private PointF mMiddlePoint = new PointF();
private PointF mStartDragPoint = new PointF();
private PointF mMovePoint = new PointF();
private float oldDist = 1f;
private float scale;
private float oldEventX = 0;
private float oldEventY = 0;
private float oldStartPointX = 0;
private float oldStartPointY = 0;
private int mViewWidth = -1;
private int mViewHeight = -1;
private boolean mDraggable = false;
public CustomZoomView(Context context) {
this(context, null, 0);
}
public CustomZoomView(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public CustomZoomView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
this.setOnTouchListener(this);
this.setOnLongClickListener(this);
v = (Vibrator) context.getSystemService(Context.VIBRATOR_SERVICE);
mPaint = new Paint();
mPaint.setColorFilter(new PorterDuffColorFilter(Color.argb(100,255,255,255), PorterDuff.Mode.SRC_IN));
}
@Override
public void onSizeChanged(int w, int h, int oldw, int oldh) {
super.onSizeChanged(w, h, oldw, oldh);
mViewWidth = w;
mViewHeight = h;
}
public void setBitmap(Bitmap bitmap) {
if (bitmap != null) {
src = new Rect();
src.left = 0;
src.top = 0;
src.right = bitmap.getWidth();
src.bottom = bitmap.getHeight();
mBitmap = bitmap;
mBitmapWidth = bitmap.getWidth() * 1;
mBitmapHeight = bitmap.getHeight() * 1;
dst = new Rect();
dst.left = (mViewWidth / 2) - (mBitmapWidth / 2);
dst.top = (mViewHeight / 2) - (mBitmapHeight / 2);
dst.right = (mViewWidth / 2) + (mBitmapWidth / 2);
dst.bottom = (mViewHeight / 2) + (mBitmapHeight / 2);
}
}
@Override
public boolean onTouch(View v, MotionEvent event) {
switch (event.getAction() & MotionEvent.ACTION_MASK) {
case MotionEvent.ACTION_DOWN:
mStartPoint.set(event.getX(), event.getY());
mStartDragPoint.set(event.getX(), event.getY());
mTempDst.set(dst.left, dst.top, dst.right, dst.bottom);
mode = DRAG;
break;
case MotionEvent.ACTION_POINTER_DOWN:
oldDist = spacing(event);
if (oldDist > 10f) {
midPoint(mMiddlePoint, event);
mode = ZOOM;
}
break;
case MotionEvent.ACTION_UP:
case MotionEvent.ACTION_POINTER_UP:
if (mode == ZOOM) {
mBitmapWidth = dst.right - dst.left;
mBitmapHeight = dst.bottom - dst.top;
}
mode = NONE;
break;
case MotionEvent.ACTION_MOVE:
if (mode == DRAG) {
mMovePoint.x = event.getX();
mMovePoint.y = event.getY();
drag(event);
} else if (mode == ZOOM) {
zoom(event);
} else if (mode == MOVE) {
move(event);
}
break;
}
return false;
}
public void move(MotionEvent event) {
int xChange = (int) (event.getX() - mStartPoint.x);
int yChange = (int) (event.getY() - mStartPoint.y);
dst.left = mTempDst.left + (xChange);
dst.top = mTempDst.top + (yChange);
dst.right = mTempDst.right + (xChange);
dst.bottom = mTempDst.bottom + (yChange);
invalidate();
}
public void drag(MotionEvent event) {
float eventX = event.getX();
float eventY = event.getY();
float spacingX = eventX - mStartDragPoint.x;
float spacingY = eventY - mStartDragPoint.y;
float newPositionLeft = (dst.left < 0 ? spacingX : spacingX * -1) + dst.left;
float newPositionRight = (spacingX) + dst.right;
float newPositionTop = (dst.top < 0 ? spacingY : spacingY * -1) + dst.top;
float newPositionBottom = (spacingY) + dst.bottom;
boolean x = true;
boolean y = true;
if (newPositionRight < 0.0f || newPositionLeft > 0.0f) {
if (newPositionRight < 0.0f && newPositionLeft > 0.0f) {
x = false;
} else {
eventX = oldEventX;
mStartDragPoint.x = oldStartPointX;
}
}
if (newPositionBottom < 0.0f || newPositionTop > 0.0f) {
if (newPositionBottom < 0.0f && newPositionTop > 0.0f) {
y = false;
} else {
eventY = oldEventY;
mStartDragPoint.y = oldStartPointY;
}
}
if (mDraggable) {
if (x) oldEventX = eventX;
if (y) oldEventY = eventY;
if (x) oldStartPointX = mStartDragPoint.x;
if (y) oldStartPointY = mStartDragPoint.y;
}
}
public void zoom(MotionEvent event) {
float newDist = spacing(event);
boolean in = newDist > oldDist;
if (!in && scale < .01f) {
return;
}
scale = newDist / oldDist;
int xChange = (int) ((mBitmapWidth * scale) / 2);
int yChange = (int) ((mBitmapHeight * scale) / 2);
if (xChange > 10 && yChange > 10) { //ADDED THIS TO KEEP IT FROM GOING INVERSE
int xMidPoint = ((dst.right - dst.left) / 2) + dst.left;
int yMidPoint = ((dst.bottom - dst.top) / 2) + dst.top;
dst.left = (int) (float) (xMidPoint - xChange);
dst.top = (int) (float) (yMidPoint - yChange);
dst.right = (int) (float) (xMidPoint + xChange);
dst.bottom = (int) (float) (yMidPoint + yChange);
}
invalidate();
}
/**
* Determine the space between the first two fingers
*/
private float spacing(MotionEvent event) {
float x = event.getX(0) - event.getX(1);
float y = event.getY(0) - event.getY(1);
return (float) Math.sqrt(x * x + y * y);
}
/**
* Calculate the mid point of the first two fingers
*/
private void midPoint(PointF point, MotionEvent event) {
float x = event.getX(0) + event.getX(1);
float y = event.getY(0) + event.getY(1);
point.set(x / 2, y / 2);
}
@Override
public boolean onLongClick(View view) {
if (mode == DRAG) {
if ((mStartPoint.x > dst.left && mStartPoint.x < dst.right) && (mStartPoint.y < dst.bottom && mStartPoint.y > dst.top)
&& (mMovePoint.x > dst.left && mMovePoint.x < dst.right) && (mMovePoint.y < dst.bottom && mMovePoint.y > dst.top)) {
mode = MOVE;
v.vibrate(500);
}
}
return true;
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
if (mode == MOVE) {
canvas.drawBitmap(mBitmap, src, dst, null);
canvas.drawBitmap(mBitmap, src, dst, mPaint);
} else {
canvas.drawBitmap(mBitmap, src, dst, null);
}
}
}
...次に、これをアクティビティに追加します
CustomZoomView customImageView = (CustomZoomView) findViewById(R.id.customZoomView);
customImageView.setBitmap(yourBitmap);
...そして、xmlのビューでこれを行います。
<your.package.name.CustomZoomView
Android:id="@+id/customZoomView"
Android:layout_width="fill_parent"
Android:layout_height="fill_parent"
Android:longClickable="true"/>
...そしてこれをマニフェストに追加します
<uses-permission Android:name="Android.permission.VIBRATE"/>
これが私の解決策です。@ alexbirkettの解決策に基づいています。
public class ZoomImageView extends ImageView {
// region . Static fields .
static final int NONE = 0;
static final int DRAG = 1;
static final int ZOOM = 2;
static final int CLICK = 3;
// endregion . Static fields .
// region . Fields .
private int mode = NONE;
private Matrix mMatrix = new Matrix();
private PointF mLastTouch = new PointF();
private PointF mStartTouch = new PointF();
private float minScale = 0.5f;
private float maxScale = 4f;
private float[] mCriticPoints;
private float mScale = 1f;
private float mRight;
private float mBottom;
private float mOriginalBitmapWidth;
private float mOriginalBitmapHeight;
private ScaleGestureDetector mScaleDetector;
//endregion . Fields .
// region . Ctor .
public ZoomImageView(Context context) {
super(context);
init(context);
}
public ZoomImageView(Context context, AttributeSet attrs) {
super(context, attrs);
init(context);
}
public ZoomImageView(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
init(context);
}
// endregion . Ctor .
// region . Overrider .
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
int bmHeight = getBmHeight();
int bmWidth = getBmWidth();
float width = getMeasuredWidth();
float height = getMeasuredHeight();
float scale = 1;
// If image is bigger then display fit it to screen.
if (width < bmWidth || height < bmHeight) {
scale = width > height ? height / bmHeight : width / bmWidth;
}
mMatrix.setScale(scale, scale);
mScale = 1f;
mOriginalBitmapWidth = scale * bmWidth;
mOriginalBitmapHeight = scale * bmHeight;
// Center the image
float redundantYSpace = (height - mOriginalBitmapHeight);
float redundantXSpace = (width - mOriginalBitmapWidth);
mMatrix.postTranslate(redundantXSpace / 2, redundantYSpace / 2);
setImageMatrix(mMatrix);
}
@Override
public boolean onTouchEvent(MotionEvent event) {
mScaleDetector.onTouchEvent(event);
mMatrix.getValues(mCriticPoints);
float translateX = mCriticPoints[Matrix.MTRANS_X];
float trnslateY = mCriticPoints[Matrix.MTRANS_Y];
PointF currentPoint = new PointF(event.getX(), event.getY());
switch (event.getAction()) {
//when one finger is touching
//set the mode to DRAG
case MotionEvent.ACTION_DOWN:
mLastTouch.set(event.getX(), event.getY());
mStartTouch.set(mLastTouch);
mode = DRAG;
break;
//when two fingers are touching
//set the mode to ZOOM
case MotionEvent.ACTION_POINTER_DOWN:
mLastTouch.set(event.getX(), event.getY());
mStartTouch.set(mLastTouch);
mode = ZOOM;
break;
//when a finger moves
//If mode is applicable move image
case MotionEvent.ACTION_MOVE:
//if the mode is ZOOM or
//if the mode is DRAG and already zoomed
if (mode == ZOOM || (mode == DRAG && mScale > minScale)) {
// region . Move image.
float deltaX = currentPoint.x - mLastTouch.x;// x difference
float deltaY = currentPoint.y - mLastTouch.y;// y difference
float scaleWidth = Math.round(mOriginalBitmapWidth * mScale);// width after applying current scale
float scaleHeight = Math.round(mOriginalBitmapHeight * mScale);// height after applying current scale
// Move image to lef or right if its width is bigger than display width
if (scaleWidth > getWidth()) {
if (translateX + deltaX > 0) {
deltaX = -translateX;
} else if (translateX + deltaX < -mRight) {
deltaX = -(translateX + mRight);
}
} else {
deltaX = 0;
}
// Move image to up or bottom if its height is bigger than display height
if (scaleHeight > getHeight()) {
if (trnslateY + deltaY > 0) {
deltaY = -trnslateY;
} else if (trnslateY + deltaY < -mBottom) {
deltaY = -(trnslateY + mBottom);
}
} else {
deltaY = 0;
}
//move the image with the matrix
mMatrix.postTranslate(deltaX, deltaY);
//set the last touch location to the current
mLastTouch.set(currentPoint.x, currentPoint.y);
// endregion . Move image .
}
break;
//first finger is lifted
case MotionEvent.ACTION_UP:
mode = NONE;
int xDiff = (int) Math.abs(currentPoint.x - mStartTouch.x);
int yDiff = (int) Math.abs(currentPoint.y - mStartTouch.y);
if (xDiff < CLICK && yDiff < CLICK)
performClick();
break;
// second finger is lifted
case MotionEvent.ACTION_POINTER_UP:
mode = NONE;
break;
}
setImageMatrix(mMatrix);
invalidate();
return true;
}
//endregion . Overrides .
// region . Privates .
private void init(Context context) {
super.setClickable(true);
mScaleDetector = new ScaleGestureDetector(context, new ScaleListener());
mCriticPoints = new float[9];
setImageMatrix(mMatrix);
setScaleType(ScaleType.MATRIX);
}
private int getBmWidth() {
Drawable drawable = getDrawable();
if (drawable != null) {
return drawable.getIntrinsicWidth();
}
return 0;
}
private int getBmHeight() {
Drawable drawable = getDrawable();
if (drawable != null) {
return drawable.getIntrinsicHeight();
}
return 0;
}
//endregion . Privates .
// region . Internal classes .
private class ScaleListener extends ScaleGestureDetector.SimpleOnScaleGestureListener {
@Override
public boolean onScaleBegin(ScaleGestureDetector detector) {
mode = ZOOM;
return true;
}
@Override
public boolean onScale(ScaleGestureDetector detector) {
float scaleFactor = detector.getScaleFactor();
float newScale = mScale * scaleFactor;
if (newScale < maxScale && newScale > minScale) {
mScale = newScale;
float width = getWidth();
float height = getHeight();
mRight = (mOriginalBitmapWidth * mScale) - width;
mBottom = (mOriginalBitmapHeight * mScale) - height;
float scaledBitmapWidth = mOriginalBitmapWidth * mScale;
float scaledBitmapHeight = mOriginalBitmapHeight * mScale;
if (scaledBitmapWidth <= width || scaledBitmapHeight <= height) {
mMatrix.postScale(scaleFactor, scaleFactor, width / 2, height / 2);
} else {
mMatrix.postScale(scaleFactor, scaleFactor, detector.getFocusX(), detector.getFocusY());
}
}
return true;
}
}
// endregion . Internal classes .
}
以下を試してください：
package com.example.nwssugeoinformationmobileapplication;
import Android.os.Bundle;
import Android.annotation.SuppressLint;
import Android.app.Activity;
import Android.content.Intent;
import Android.util.FloatMath;
import Android.util.Log;
import Android.view.Menu;
import Android.view.MenuInflater;
import Android.view.MenuItem;
import Android.view.MotionEvent;
import Android.view.View.OnTouchListener;
import Android.widget.TabHost;
import Android.widget.TabHost.TabSpec;
import Android.graphics.Matrix;
import Android.graphics.PointF;
import Android.graphics.RectF;
import Android.graphics.drawable.Drawable;
import Android.view.View;
import Android.widget.ImageView;
public class MainActivity extends Activity implements OnTouchListener {
private static final String TAG = "Touch";
Matrix matrix = new Matrix();
Matrix savedMatrix = new Matrix();
static final int NONE = 0;
static final int DRAG = 1;
static final int ZOOM = 2;
int mode = NONE;
PointF start = new PointF();
PointF mid = new PointF();
float oldDist = 1f;
private ImageView view;
private float[] matrixValues = new float[9];
private float maxZoom;
private float minZoom;
private float height;
private float width;
private RectF viewRect;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
TabHost th = (TabHost) findViewById (R.id.tabhost);
th.setup();
TabSpec specs = th.newTabSpec("tag1");
specs.setContent(R.id.tab1);
specs.setIndicator("Map");
th.addTab(specs);
specs = th.newTabSpec("tag2");
specs.setContent(R.id.tab2);
specs.setIndicator("Search");
th.addTab(specs);
view = (ImageView) findViewById(R.id.imageView1);
Drawable bitmap = getResources().getDrawable(R.drawable.map);
view.setImageDrawable(bitmap);
view.setOnTouchListener(this);
matrix.setTranslate(1f, 1f);
view.setImageMatrix(matrix);
}
@Override
public void onWindowFocusChanged(boolean hasFocus) {
super.onWindowFocusChanged(hasFocus);
if(hasFocus){
init();
}
}
private void init() {
maxZoom = 2;
minZoom = 1f;
height = view.getDrawable().getIntrinsicHeight();
width = view.getDrawable().getIntrinsicWidth();
viewRect = new RectF(0, 0, view.getWidth(), view.getHeight());
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.menus, menu);
return true;
}
public boolean onOptionsItemSelected(MenuItem item) {
if(item.getItemId()== R.id.item1){
Log.d("Tracks", "Track Us was Clicked");
startActivity(new Intent (MainActivity.this, Tracklocation.class ));
}
if(item.getItemId()== R.id.item2){
Log.d("Updates", "Updates was Clicked");
startActivity(new Intent (MainActivity.this, Updates.class ));
}
if(item.getItemId()== R.id.item3){
Log.d("About Us", "About Us was Clicked");
startActivity(new Intent (MainActivity.this, Horoscope.class ));
}
return super.onOptionsItemSelected(item);
}
@Override
public boolean onTouch(View v, MotionEvent rawEvent) {
ImageView view = (ImageView) v;
view.setScaleType(ImageView.ScaleType.MATRIX);
dumpEvent(rawEvent);
// Handle touch events here...
switch (rawEvent.getAction() & MotionEvent.ACTION_MASK) {
case MotionEvent.ACTION_DOWN:
savedMatrix.set(matrix);
start.set(rawEvent.getX(), rawEvent.getY());
Log.d(TAG, "mode=DRAG");
mode = DRAG;
break;
case MotionEvent.ACTION_POINTER_DOWN:
oldDist = spacing(rawEvent);
Log.d(TAG, "oldDist=" + oldDist);
if (oldDist > 10f) {
savedMatrix.set(matrix);
midPoint(mid, rawEvent);
mode = ZOOM;
Log.d(TAG, "mode=ZOOM");
}
break;
case MotionEvent.ACTION_UP:
case MotionEvent.ACTION_POINTER_UP:
mode = NONE;
Log.d(TAG, "mode=NONE");
break;
case MotionEvent.ACTION_MOVE:
if (mode == DRAG) {
matrix.set(savedMatrix);
// limit pan
matrix.getValues(matrixValues);
float currentY = matrixValues[Matrix.MTRANS_Y];
float currentX = matrixValues[Matrix.MTRANS_X];
float currentScale = matrixValues[Matrix.MSCALE_X];
float currentHeight = height * currentScale;
float currentWidth = width * currentScale;
float dx = rawEvent.getX() - start.x;
float dy = rawEvent.getY() - start.y;
float newX = currentX+dx;
float newY = currentY+dy;
RectF drawingRect = new RectF(newX, newY, newX+currentWidth, newY+currentHeight);
float diffUp = Math.min(viewRect.bottom-drawingRect.bottom, viewRect.top-drawingRect.top);
float diffDown = Math.max(viewRect.bottom-drawingRect.bottom, viewRect.top-drawingRect.top);
float diffLeft = Math.min(viewRect.left-drawingRect.left, viewRect.right-drawingRect.right);
float diffRight = Math.max(viewRect.left-drawingRect.left, viewRect.right-drawingRect.right);
if(diffUp > 0 ){
dy +=diffUp;
}
if(diffDown < 0){
dy +=diffDown;
}
if( diffLeft> 0){
dx += diffLeft;
}
if(diffRight < 0){
dx += diffRight;
}
matrix.postTranslate(dx, dy);
} else if (mode == ZOOM) {
float newDist = spacing(rawEvent);
Log.d(TAG, "newDist=" + newDist);
if (newDist > 10f) {
matrix.set(savedMatrix);
float scale1 = newDist / oldDist;
matrix.getValues(matrixValues);
float currentScale = matrixValues[Matrix.MSCALE_X];
// limit zoom
if (scale1 * currentScale > maxZoom) {
scale1 = maxZoom / currentScale;
} else if (scale1 * currentScale < minZoom) {
scale1 = minZoom / currentScale;
}
matrix.postScale(scale1, scale1, mid.x, mid.y);
}
}
break;
}
view.setImageMatrix(matrix);
return true;
}
@SuppressWarnings("deprecation")
private void dumpEvent(MotionEvent event) {
String names[] = { "DOWN", "UP", "MOVE", "CANCEL", "OUTSIDE",
"POINTER_DOWN", "POINTER_UP", "7?", "8?", "9?" };
StringBuilder sb = new StringBuilder();
int action = event.getAction();
int actionCode = action & MotionEvent.ACTION_MASK;
sb.append("event ACTION_").append(names[actionCode]);
if (actionCode == MotionEvent.ACTION_POINTER_DOWN
|| actionCode == MotionEvent.ACTION_POINTER_UP) {
sb.append("(pid ").append(
action >> MotionEvent.ACTION_POINTER_ID_SHIFT);
sb.append(")");
}
sb.append("[");
for (int i = 0; i < event.getPointerCount(); i++) {
sb.append("#").append(i);
sb.append("(pid ").append(event.getPointerId(i));
sb.append(")=").append((int) event.getX(i));
sb.append(",").append((int) event.getY(i));
if (i + 1 < event.getPointerCount())
sb.append(";");
}
sb.append("]");
Log.d(TAG, sb.toString());
}
/** Determine the space between the first two fingers */
private float spacing(MotionEvent event) {
float x = event.getX(0) - event.getX(1);
float y = event.getY(0) - event.getY(1);
return FloatMath.sqrt(x * x + y * y);
}
/** Calculate the mid point of the first two fingers */
@SuppressLint("FloatMath")
private void midPoint(PointF point, MotionEvent event) {
float x = event.getX(0) + event.getX(1);
float y = event.getY(0) + event.getY(1);
point.set(x / 2, y / 2);
}
}
About＆supportダイアログを呼び出すメソッド
public void setupAboutSupport() {
try {
// The About&Support AlertDialog is active
activeAboutSupport=true;
View messageView;
int orientation=this.getResources().getConfiguration().orientation;
// Inflate the about message contents
messageView = getLayoutInflater().inflate(R.layout.about_support, null, false);
ContextThemeWrapper ctw = new ContextThemeWrapper(this, R.style.MyCustomTheme_AlertDialog1);
AlertDialog.Builder builder = new AlertDialog.Builder(ctw);
builder.setIcon(R.mipmap.ic_launcher);
builder.setTitle(R.string.action_aboutSupport);
builder.setView(messageView);
TouchImageView imgDisplay = (TouchImageView) messageView.findViewById(R.id.action_infolinks_about_support);
imgDisplay.setMaxZoom(3f);
Bitmap bitmap = BitmapFactory.decodeResource(getResources(), R.mipmap.myinfolinks_about_support);
int imageWidth = bitmap.getWidth();
int imageHeight = bitmap.getHeight();
int newWidth;
// Calculate the new About_Support image width
if(orientation==Configuration.ORIENTATION_PORTRAIT ) {
// For 7" up to 10" tablets
//if ((getResources().getConfiguration().screenLayout & Configuration.SCREENLAYOUT_SIZE_MASK) == Configuration.SCREENLAYOUT_SIZE_XLARGE) {
if (SingletonMyInfoLinks.isTablet) {
// newWidth = widthScreen - (two borders of about_support layout and 20% of width Screen)
newWidth = widthScreen - ((2 * toPixels(8)) + (int)(widthScreen*0.2));
} else newWidth = widthScreen - ((2 * toPixels(8)) + (int)(widthScreen*0.1));
} else {
// For 7" up to 10" tablets
//if ((getResources().getConfiguration().screenLayout & Configuration.SCREENLAYOUT_SIZE_MASK) == Configuration.SCREENLAYOUT_SIZE_XLARGE) {
if (SingletonMyInfoLinks.isTablet) {
newWidth = widthScreen - ((2 * toPixels(8)) + (int)(widthScreen*0.5));
} else newWidth = widthScreen - ((2 * toPixels(8)) + (int)(widthScreen*0.3));
}
// Get the scale factor
float scaleFactor = (float)newWidth/(float)imageWidth;
// Calculate the new About_Support image height
int newHeight = (int)(imageHeight * scaleFactor);
// Set the new bitmap corresponding the adjusted About_Support image
bitmap = Bitmap.createScaledBitmap(bitmap, newWidth, newHeight, true);
// Rescale the image
imgDisplay.setImageBitmap(bitmap);
dialogAboutSupport = builder.show();
TextView textViewVersion = (TextView) dialogAboutSupport.findViewById(R.id.action_strVersion);
textViewVersion.setText(Html.fromHtml(getString(R.string.aboutSupport_text1)+" <b>"+versionName+"</b>"));
TextView textViewDeveloperName = (TextView) dialogAboutSupport.findViewById(R.id.action_strDeveloperName);
textViewDeveloperName.setText(Html.fromHtml(getString(R.string.aboutSupport_text2)+" <b>"+SingletonMyInfoLinks.developerName+"</b>"));
TextView textViewSupportEmail = (TextView) dialogAboutSupport.findViewById(R.id.action_strSupportEmail);
textViewSupportEmail.setText(Html.fromHtml(getString(R.string.aboutSupport_text3)+" "+SingletonMyInfoLinks.developerEmail));
TextView textViewCompanyName = (TextView) dialogAboutSupport.findViewById(R.id.action_strCompanyName);
textViewCompanyName.setText(Html.fromHtml(getString(R.string.aboutSupport_text4)+" "+SingletonMyInfoLinks.companyName));
Button btnOk = (Button) dialogAboutSupport.findViewById(R.id.btnOK);
btnOk.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
dialogAboutSupport.dismiss();
}
});
dialogAboutSupport.setOnDismissListener(new DialogInterface.OnDismissListener() {
@Override
public void onDismiss(final DialogInterface dialog) {
// the About & Support AlertDialog is closed
activeAboutSupport=false;
}
});
dialogAboutSupport.getWindow().setBackgroundDrawable(new ColorDrawable(SingletonMyInfoLinks.atualBackgroundColor));
/* Effect that image appear slower */
// Only the fade_in matters
AlphaAnimation fade_out = new AlphaAnimation(1.0f, 0.0f);
AlphaAnimation fade_in = new AlphaAnimation(0.0f, 1.0f);
AlphaAnimation a = false ? fade_out : fade_in;
a.setDuration(2000); // 2 sec
a.setFillAfter(true); // Maintain the visibility at the end of animation
// Animation start
ImageView img = (ImageView) messageView.findViewById(R.id.action_infolinks_about_support);
img.startAnimation(a);
} catch (Exception e) {
//Log.e(SingletonMyInfoLinks.appNameText +"-" + getLocalClassName() + ": ", e.getMessage());
}
}
それは古いですが、これは他の誰かを助けるかもしれません。
TouchImageViewクラスの下では、ピンチまたはダブルタップでのズームイン/アウトの両方をサポートしています
import Android.content.Context;
import Android.graphics.Matrix;
import Android.graphics.PointF;
import Android.graphics.drawable.Drawable;
import Android.util.AttributeSet;
import Android.util.Log;
import Android.view.GestureDetector;
import Android.view.MotionEvent;
import Android.view.ScaleGestureDetector;
import Android.view.View;
import Android.widget.ImageView;
public class TouchImageView extends ImageView implements GestureDetector.OnGestureListener, GestureDetector.OnDoubleTapListener {
Matrix matrix;
// We can be in one of these 3 states
static final int NONE = 0;
static final int DRAG = 1;
static final int ZOOM = 2;
int mode = NONE;
// Remember some things for zooming
PointF last = new PointF();
PointF start = new PointF();
float minScale = 1f;
float maxScale = 3f;
float[] m;
int viewWidth, viewHeight;
static final int CLICK = 3;
float saveScale = 1f;
protected float origWidth, origHeight;
int oldMeasuredWidth, oldMeasuredHeight;
ScaleGestureDetector mScaleDetector;
Context context;
public TouchImageView(Context context) {
super(context);
sharedConstructing(context);
}
public TouchImageView(Context context, AttributeSet attrs) {
super(context, attrs);
sharedConstructing(context);
}
GestureDetector mGestureDetector;
private void sharedConstructing(Context context) {
super.setClickable(true);
this.context = context;
mGestureDetector = new GestureDetector(context, this);
mGestureDetector.setOnDoubleTapListener(this);
mScaleDetector = new ScaleGestureDetector(context, new ScaleListener());
matrix = new Matrix();
m = new float[9];
setImageMatrix(matrix);
setScaleType(ScaleType.MATRIX);
setOnTouchListener(new OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
mScaleDetector.onTouchEvent(event);
mGestureDetector.onTouchEvent(event);
PointF curr = new PointF(event.getX(), event.getY());
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
last.set(curr);
start.set(last);
mode = DRAG;
break;
case MotionEvent.ACTION_MOVE:
if (mode == DRAG) {
float deltaX = curr.x - last.x;
float deltaY = curr.y - last.y;
float fixTransX = getFixDragTrans(deltaX, viewWidth,
origWidth * saveScale);
float fixTransY = getFixDragTrans(deltaY, viewHeight,
origHeight * saveScale);
matrix.postTranslate(fixTransX, fixTransY);
fixTrans();
last.set(curr.x, curr.y);
}
break;
case MotionEvent.ACTION_UP:
mode = NONE;
int xDiff = (int) Math.abs(curr.x - start.x);
int yDiff = (int) Math.abs(curr.y - start.y);
if (xDiff < CLICK && yDiff < CLICK)
performClick();
break;
case MotionEvent.ACTION_POINTER_UP:
mode = NONE;
break;
}
setImageMatrix(matrix);
invalidate();
return true; // indicate event was handled
}
});
}
public void setMaxZoom(float x) {
maxScale = x;
}
@Override
public boolean onSingleTapConfirmed(MotionEvent e) {
return false;
}
@Override
public boolean onDoubleTap(MotionEvent e) {
// Double tap is detected
Log.i("MAIN_TAG", "Double tap detected");
float origScale = saveScale;
float mScaleFactor;
if (saveScale == maxScale) {
saveScale = minScale;
mScaleFactor = minScale / origScale;
} else {
saveScale = maxScale;
mScaleFactor = maxScale / origScale;
}
matrix.postScale(mScaleFactor, mScaleFactor, viewWidth / 2,
viewHeight / 2);
fixTrans();
return false;
}
@Override
public boolean onDoubleTapEvent(MotionEvent e) {
return false;
}
@Override
public boolean onDown(MotionEvent e) {
return false;
}
@Override
public void onShowPress(MotionEvent e) {
}
@Override
public boolean onSingleTapUp(MotionEvent e) {
return false;
}
@Override
public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY) {
return false;
}
@Override
public void onLongPress(MotionEvent e) {
}
@Override
public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {
return false;
}
private class ScaleListener extends
ScaleGestureDetector.SimpleOnScaleGestureListener {
@Override
public boolean onScaleBegin(ScaleGestureDetector detector) {
mode = ZOOM;
return true;
}
@Override
public boolean onScale(ScaleGestureDetector detector) {
float mScaleFactor = detector.getScaleFactor();
float origScale = saveScale;
saveScale *= mScaleFactor;
if (saveScale > maxScale) {
saveScale = maxScale;
mScaleFactor = maxScale / origScale;
} else if (saveScale < minScale) {
saveScale = minScale;
mScaleFactor = minScale / origScale;
}
if (origWidth * saveScale <= viewWidth
|| origHeight * saveScale <= viewHeight)
matrix.postScale(mScaleFactor, mScaleFactor, viewWidth / 2,
viewHeight / 2);
else
matrix.postScale(mScaleFactor, mScaleFactor,
detector.getFocusX(), detector.getFocusY());
fixTrans();
return true;
}
}
void fixTrans() {
matrix.getValues(m);
float transX = m[Matrix.MTRANS_X];
float transY = m[Matrix.MTRANS_Y];
float fixTransX = getFixTrans(transX, viewWidth, origWidth * saveScale);
float fixTransY = getFixTrans(transY, viewHeight, origHeight
* saveScale);
if (fixTransX != 0 || fixTransY != 0)
matrix.postTranslate(fixTransX, fixTransY);
}
float getFixTrans(float trans, float viewSize, float contentSize) {
float minTrans, maxTrans;
if (contentSize <= viewSize) {
minTrans = 0;
maxTrans = viewSize - contentSize;
} else {
minTrans = viewSize - contentSize;
maxTrans = 0;
}
if (trans < minTrans)
return -trans + minTrans;
if (trans > maxTrans)
return -trans + maxTrans;
return 0;
}
float getFixDragTrans(float delta, float viewSize, float contentSize) {
if (contentSize <= viewSize) {
return 0;
}
return delta;
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
viewWidth = MeasureSpec.getSize(widthMeasureSpec);
viewHeight = MeasureSpec.getSize(heightMeasureSpec);
//
// Rescales image on rotation
//
if (oldMeasuredHeight == viewWidth && oldMeasuredHeight == viewHeight
|| viewWidth == 0 || viewHeight == 0)
return;
oldMeasuredHeight = viewHeight;
oldMeasuredWidth = viewWidth;
if (saveScale == 1) {
// Fit to screen.
float scale;
Drawable drawable = getDrawable();
if (drawable == null || drawable.getIntrinsicWidth() == 0
|| drawable.getIntrinsicHeight() == 0)
return;
int bmWidth = drawable.getIntrinsicWidth();
int bmHeight = drawable.getIntrinsicHeight();
Log.d("bmSize", "bmWidth: " + bmWidth + " bmHeight : " + bmHeight);
float scaleX = (float) viewWidth / (float) bmWidth;
float scaleY = (float) viewHeight / (float) bmHeight;
scale = Math.min(scaleX, scaleY);
matrix.setScale(scale, scale);
// Center the image
float redundantYSpace = (float) viewHeight
- (scale * (float) bmHeight);
float redundantXSpace = (float) viewWidth
- (scale * (float) bmWidth);
redundantYSpace /= (float) 2;
redundantXSpace /= (float) 2;
matrix.postTranslate(redundantXSpace, redundantYSpace);
origWidth = viewWidth - 2 * redundantXSpace;
origHeight = viewHeight - 2 * redundantYSpace;
setImageMatrix(matrix);
}
fixTrans();
}
}
使用法： XMLとJavaの両方でImageViewをTouchImageViewに置き換えることができます
1。XMLの場合
<?xml version="1.0" encoding="utf-8"?>
<com.example.Android.myapp.TouchImageView
xmlns:Android="http://schemas.Android.com/apk/res/Android"
Android:id="@+id/imViewedImage"
Android:layout_width="match_parent"
Android:layout_height="match_parent"
Android:clickable="true"
Android:focusable="true" />
2。Javaの場合
TouchImageView imViewedImage = findViewById(R.id.imViewedImage);
表示する前に画像のスケールを設定する場合、このクラスを使用します： https://github.com/MikeOrtiz/TouchImageView/ blob/master/src/com/ortiz/touch/TouchImageView.Java 。
また、画像はダブルタップでサイズ変更できます。
ImageView内でViewPagerを使用する場合、この修正を適用します： https://github.com/MikeOrtiz/TouchImageView/issues/125 。
ZoomLibリンク： https://drive.google.com/uc?export=download&id=0B34PUThnUsjVaHpkaGk0Z1hSR
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.dummy_layout_for_zooming);// Activity layout
mZoomLinearLayout = (LinearLayout) findViewById(R.id.mZoomLinearLayout);// LinearLayout inside Activity layout
View v = ((LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE)).inflate(R.layout.layout_for_zoom, null, false);// View wants to zoom
v.setLayoutParams(new LinearLayout.LayoutParams(LinearLayout.LayoutParams.FILL_PARENT, LinearLayout.LayoutParams.FILL_PARENT));
ZoomView zoomView = new ZoomView(this);// intialize lib
zoomView.addView(v);
mZoomLinearLayout.addView(zoomView);
}
この回答に少し遅れていることは知っていますが、誰かの助けになることを願っています。
私は同じものを探していました（ピンチを使用してズームし、画像をドラッグします） this Android Developers Blog link を見つけました。
完璧に動作します。アーティファクトはありません。 ScaleGestureDetectorを使用します。
変更するだけACTION_MOVE_EVENT in Chirag Raval Answer ZOOM_IN LIMITを設定するため
float[] values = new float[9]; matrix.getValues(values);
//0.37047964 is limit for zoom in
if(values[Matrix.MSCALE_X]>0.37047964) {
matrix.set(savedMatrix);
matrix.postScale(scale, scale, mid.x, mid.y);
view.setImageMatrix(matrix);
}else if (scale>1){
matrix.set(savedMatrix);
matrix.postScale(scale, scale, mid.x, mid.y);
view.setImageMatrix(matrix);
}