AndroidでWebView
のスクロールリスナーを実装する方法
これを試しましたが、_Log.i
Webビューのスクロール。
package com.example.webview.full.width;
import Android.content.Context;
import Android.util.AttributeSet;
import Android.util.Log;
import Android.webkit.WebView;
import Android.widget.AbsListView;
import Android.widget.AbsListView.OnScrollListener;
public class scorllableWebview extends WebView implements OnScrollListener {
Context ctx;
AttributeSet atrs;
public scorllableWebview(Context context) {
super(context);
ctx = context;
}
public scorllableWebview(Context context, AttributeSet atters){
super(context, atters);
ctx = context;
atrs = atters;
}
@Override
public void onScroll(AbsListView view, int firstVisibleItem,
int visibleItemCount, int totalItemCount) {
Log.i("onScroll", "Called");
}
@Override
public void onScrollStateChanged(AbsListView view, int scrollState) {
Log.i("onScrollStateChanged", "Called");
}
}
これが私のMainActivity.Java
package com.example.webview.full.width;
import Android.app.Activity;
import Android.app.ProgressDialog;
import Android.os.Bundle;
import Android.view.Menu;
import Android.webkit.WebView;
import Android.webkit.WebViewClient;
import Android.widget.Toast;
public class MainActivity extends Activity {
ProgressDialog progressDialog;
scorllableWebview wv;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
wv = (scorllableWebview) findViewById(R.id.scorllableWebview);
wv.getSettings().setJavaScriptEnabled(true);
wv.getSettings().setBuiltInZoomControls(true);
wv.getSettings().supportZoom();
progressDialog = ProgressDialog.show(MainActivity.this,
"Loading Book...!", "Please Wait");
progressDialog.setCancelable(true);
String htnlString = "<!DOCTYPE html><html><body style = \"text-align:center\"><script type=\"text/javascript\">for(a=1;a<=10;a++)document.write('<img style=\"border-style:dotted;border-width:10px;border-color:black;\"src=\"http://myURL.com/books_snaps/EN567/'+a+'.jpg\" alt=\"Page Not Found\"/>');</script></body></html>";
// width=\"100%\"
wv.setWebViewClient(new WebViewClient() {
@Override
public void onPageFinished(WebView view, String url) {
progressDialog.dismiss();
Toast.makeText(MainActivity.this, "Completed",
Toast.LENGTH_SHORT).show();
wv.pageUp(true);
super.onPageFinished(view, url);
}
});
wv.loadDataWithBaseURL(null, htnlString, "text/html", "UTF-8", null);
}
}
これが私のXMLファイルです。
<RelativeLayout xmlns:Android="http://schemas.Android.com/apk/res/Android"
Android:layout_width="match_parent"
Android:layout_height="match_parent" >
<com.example.webview.full.width.scorllableWebview
xmlns:Android="http://schemas.Android.com/apk/res/Android"
Android:id="@+id/scorllableWebview"
Android:layout_width="match_parent"
Android:layout_height="match_parent" />
</RelativeLayout>
何かのようなもの:
public class ObservableWebView extends WebView
{
private OnScrollChangedCallback mOnScrollChangedCallback;
public ObservableWebView(final Context context)
{
super(context);
}
public ObservableWebView(final Context context, final AttributeSet attrs)
{
super(context, attrs);
}
public ObservableWebView(final Context context, final AttributeSet attrs, final int defStyle)
{
super(context, attrs, defStyle);
}
@Override
protected void onScrollChanged(final int l, final int t, final int oldl, final int oldt)
{
super.onScrollChanged(l, t, oldl, oldt);
if(mOnScrollChangedCallback != null) mOnScrollChangedCallback.onScroll(l, t, oldl, oldt);
}
public OnScrollChangedCallback getOnScrollChangedCallback()
{
return mOnScrollChangedCallback;
}
public void setOnScrollChangedCallback(final OnScrollChangedCallback onScrollChangedCallback)
{
mOnScrollChangedCallback = onScrollChangedCallback;
}
/**
* Impliment in the activity/fragment/view that you want to listen to the webview
*/
public static interface OnScrollChangedCallback
{
public void onScroll(int l, int t, int oldl, int oldt);
}
}
動作するはずですが、これはテストされていませんが、Androidのほぼすべてのビューで動作します。
次のように実装します。
wv = (ObservableWebView) findViewById(R.id.scorllableWebview);
wv.setOnScrollChangedCallback(new OnScrollChangedCallback(){
public void onScroll(int l, int t, int oldl, int oldt){
if(t> oldt){
//Do stuff
System.out.println("Swipe UP");
//Do stuff
}
else if(t< oldt){
System.out.println("Swipe Down");
}
Log.d(TAG,"We Scrolled etc...");
}
});
API 23以降、これを行う必要はありません。WebViewを含むすべてのビューで利用可能な新しい OnScrollChangeListener を使用できます。ただし、古いバージョンをサポートする必要があるため、@ Chris.Jenkinsの提案を引き続き使用できます。新しいOnScrollChangeListenerインターフェイスとの互換性を高めるために、提案されたクラスを調整しました。
public class ObservableWebView extends WebView {
private OnScrollChangeListener onScrollChangeListener;
public ObservableWebView(Context context) {
super(context);
}
public ObservableWebView(Context context, AttributeSet attrs) {
super(context, attrs);
}
public ObservableWebView(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
}
@Override
protected void onScrollChanged(int l, int t, int oldl, int oldt) {
super.onScrollChanged(l, t, oldl, oldt);
if (onScrollChangeListener != null) {
onScrollChangeListener.onScrollChange(this, l, t, oldl, oldt);
}
}
public void setOnScrollChangeListener(OnScrollChangeListener onScrollChangeListener) {
this.onScrollChangeListener = onScrollChangeListener;
}
public OnScrollChangeListener getOnScrollChangeListener() {
return onScrollChangeListener;
}
public interface OnScrollChangeListener {
/**
* Called when the scroll position of a view changes.
*
* @param v The view whose scroll position has changed.
* @param scrollX Current horizontal scroll Origin.
* @param scrollY Current vertical scroll Origin.
* @param oldScrollX Previous horizontal scroll Origin.
* @param oldScrollY Previous vertical scroll Origin.
*/
void onScrollChange(WebView v, int scrollX, int scrollY, int oldScrollX, int oldScrollY);
}
}
これを試してください(必要なすべてのビューに対して):GestureDetectorを作成してからTouchListenerを作成し、スクロールするビューに設定します
OnCreate
private GestureDetector gestureDetector;
gestureDetector = new GestureDetector(this, new
GestureDetector.SimpleOnGestureListener() {
@Override
public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float
velocityY) {
if (velocityY < 0) {
collapse(frToolBar);
} else if (velocityY > 0) {
if (frToolBar.getVisibility()==View.GONE)
expand(frToolBar);
}
return super.onFling(e1, e2, velocityX, velocityY);
}
@Override
public boolean onDown(MotionEvent e) {
return super.onDown(e);
}
});
webView.setOnTouchListener((view, motionEvent) ->
gestureDetector.onTouchEvent(motionEvent));
Two method -
public static void expand(final View v) {
v.measure(WindowManager.LayoutParams.MATCH_PARENT,
indowManager.LayoutParams.WRAP_CONTENT);
// final int targetHeight = v.getMeasuredHeight();
final int targetHeight = v.getHeight();
v.getLayoutParams().height = 1;
v.setVisibility(View.VISIBLE);
Animation a = new Animation() {
@Override
protected void applyTransformation(float interpolatedTime, Transformation t)
{
v.getLayoutParams().height = interpolatedTime == 1
? WindowManager.LayoutParams.WRAP_CONTENT
: (int) (targetHeight * interpolatedTime);
v.requestLayout();
}
@Override
public boolean willChangeBounds() {
return true;
}
};
a.setDuration(300);
v.startAnimation(a);
}
public static void collapse(final View v) {
final int initialHeight = v.getMeasuredHeight();
Animation a = new Animation() {
@Override
protected void applyTransformation(float interpolatedTime, Transformation t)
{
if (interpolatedTime == 1) {
v.setVisibility(View.GONE);
} else {
v.getLayoutParams().height = initialHeight - (int) (initialHeight *
interpolatedTime);
v.requestLayout();
}
}
@Override
public boolean willChangeBounds() {
return true;
}
};
a.setDuration(300);
v.startAnimation(a);
}