nullオブジェクト参照で仮想メソッド 'int Android.text.Layout.getLineCount（）'を呼び出そうとしました
Nullポインターの例外がランダムに発生します。通常は機能し、クラッシュすることもあります。多くの検索を行いましたが、ヘルプが表示される適切な行がないため、ヘルプが表示されませんでした。
ハンドラーも使用しています。
私のlogcatエラーは次のとおりで、その下にコードが追加されています。
Java.lang.NullPointerException: Attempt to invoke virtual method 'int Android.text.Layout.getLineCount()' on a null object reference
at Android.widget.TextView.onMeasure(TextView.Java:6703)
at Android.view.View.measure(View.Java:17547)
at Android.view.ViewGroup.measureChildWithMargins(ViewGroup.Java:5535)
at Android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.Java:1436)
at Android.widget.LinearLayout.measureVertical(LinearLayout.Java:722)
at Android.widget.LinearLayout.onMeasure(LinearLayout.Java:613)
at Android.view.View.measure(View.Java:17547)
at Android.widget.RelativeLayout.measureChildHorizontal(RelativeLayout.Java:727)
at Android.widget.RelativeLayout.onMeasure(RelativeLayout.Java:463)
at Android.view.View.measure(View.Java:17547)
at Android.view.ViewGroup.measureChildWithMargins(ViewGroup.Java:5535)
at Android.widget.FrameLayout.onMeasure(FrameLayout.Java:436)
at Android.support.v7.internal.widget.ContentFrameLayout.onMeasure(ContentFrameLayout.Java:135)
at Android.view.View.measure(View.Java:17547)
at Android.view.ViewGroup.measureChildWithMargins(ViewGroup.Java:5535)
at Android.widget.FrameLayout.onMeasure(FrameLayout.Java:436)
at Android.view.View.measure(View.Java:17547)
at Android.view.ViewGroup.measureChildWithMargins(ViewGroup.Java:5535)
at Android.widget.FrameLayout.onMeasure(FrameLayout.Java:436)
at Android.view.View.measure(View.Java:17547)
at Android.view.ViewGroup.measureChildWithMargins(ViewGroup.Java:5535)
at Android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.Java:1436)
at Android.widget.LinearLayout.measureVertical(LinearLayout.Java:722)
at Android.widget.LinearLayout.onMeasure(LinearLayout.Java:613)
at Android.view.View.measure(View.Java:17547)
at Android.view.ViewGroup.measureChildWithMargins(ViewGroup.Java:5535)
at Android.widget.FrameLayout.onMeasure(FrameLayout.Java:436)
at com.Android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.Java:2615)
at Android.view.View.measure(View.Java:17547)
at Android.view.ViewRootImpl.performMeasure(ViewRootImpl.Java:2015)
at Android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.Java:1173)
at Android.view.ViewRootImpl.performTraversals(ViewRootImpl.Java:1379)
at Android.view.ViewRootImpl.doTraversal(ViewRootImpl.Java:1061)
at Android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.Java:5885)
at Android.view.Choreographer$CallbackRecord.run(Choreographer.Java:767)
at Android.view.Choreographer.doCallbacks(Choreographer.Java:580)
at Android.view.Choreographer.doFrame(Choreographer.Java:550)
at Android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.Java:753)
at Android.os.Handler.handleCallback(Handler.Java:739)
at Android.os.Handler.dispatchMessage(Handler.Java:95)
at Android.os.Looper.loop(Looper.Java:135)
at Android.app.ActivityThread.main(ActivityThread.Java:5254)
at Java.lang.reflect.Method.invoke(Native Method)
at Java.lang.reflect.Method.invoke(Method.Java:372)
at com.Android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.Java:903)
at com.Android.internal.os.ZygoteInit.main(ZygoteInit.Java:698)
これは次のような私のコードです。ここでは通常、最初のインストールで登録をクリックするかボタンを忘れるとクラッシュし、その後は通常は正常に動作しますが、エラーが発生することがあります。
public class Login extends AppCompatActivity implements View.OnClickListener,ProcessedResult
{
private Handler uiThreadHandler;
private Context context;
private EditText ed_password,ed_Username;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_login);
StorageManager storageManager=new StorageManager(this,"abc");
String accessTokenCheck=storageManager.getValue(Constants.SharedPreferences.LACCESSTOKEN, null);
if(accessTokenCheck!=null)
GeneralFunctions.moveToNextActivity(MainActivity.class,this);
uiThreadHandler = new UIThreadHandler();
new Thread(new Runnable() {
@Override
public void run() {
init();
}
}).start();
}
//Initialization part
private final void init()
{
context=this;
FontsManager.initFormAssets(this, "fonts/Lato-Regular.ttf");
FontsManager.changeFonts(this);
TextView myTextView = GeneralFunctions.findViewByIdAndCast(this, R.id.login_tv_noAccount);
myTextView.setMovementMethod(new LinkTouchMovementMethod());
myTextView.setHighlightColor(getResources().getColor(Android.R.color.transparent));
SpannableString mySpannable = new SpannableString(myTextView.getText().toString());
TouchableSpan touchableSpan = new TouchableSpan(Color.parseColor("#606060"),getResources().getColor(R.color.colorBlue),Color.TRANSPARENT) {
@Override
public void onClick(View textView) {
GeneralFunctions.simpleMoveToNextActivity(Register.class, context);
}
};
mySpannable.setSpan(touchableSpan, GeneralFunctions.getText(myTextView).indexOf("Register"), GeneralFunctions.getText(myTextView).length(), 0);
myTextView.setText(mySpannable, TextView.BufferType.SPANNABLE);
TextView tv_forgetPassword = GeneralFunctions.findViewByIdAndCast(this,R.id.login_tv_foregetPassword);
GeneralFunctions.setTextColorSelector(Color.parseColor("#606060"),getResources().getColor(R.color.colorBlue),tv_forgetPassword);
tv_forgetPassword.setOnClickListener(this);
ed_password = (EditText) findViewById(R.id.login_ed_password);
ed_Username = (EditText) findViewById(R.id.login_ed_usrName);
ed_password.setTransformationMethod(new AsteriskPasswordTransformationMethod());
Button bt_Login= GeneralFunctions.findViewByIdAndCast(this,R.id.login_bt_signin);
setSelector(R.drawable.big_green_btn_normal, bt_Login);
Button bt_linkedInd= GeneralFunctions.findViewByIdAndCast(this,R.id.login_bt_linkedin);
setSelector(R.drawable.big_blue_btn_normal, bt_linkedInd);
}
private final void setSelector(final int resourceId,final Button button)
{
button.setOnClickListener(this);
try
{
String name = getNameofResyrce(activity,resourceId);
String newString=name.replace("normal","pressed");
StateListDrawable states = new StateListDrawable();
states.addState(new int[] {Android.R.attr.state_pressed}, getDrawablebyName(activity,newString));
states.addState(new int[] {Android.R.attr.state_focused},getDrawablebyName(activity, newString));
states.addState(new int[]{}, getDrawablebyName(activity, name));
if(view instanceof Button)
((Button)view).setBackground(states);
else
if(view instanceof ImageView)
((ImageView)view).setImageDrawable(states);
} catch (Exception e)
{
}
}
public static synchronized Drawable getDrawablebyName(Context context,String name)
{
Resources resources = context.getResources();
final int resourceId = resources.getIdentifier(name, "drawable", context.getPackageName());
return resources.getDrawable(resourceId);
}
@Override
public void onClick(View v) {
switch (v.getId())
{
case R.id.login_bt_linkedin:
{
DWebView transparentDialog = DWebView.newInstance();
showProgressDialog(transparentDialog, Constants.DialogConstants.WEB);
}
break;
case R.id.login_bt_signin:
uiThreadHandler.sendEmptyMessage(Constants.ActivityBasicsCode.VALIDATION);
break;
case R.id.login_tv_foregetPassword:
GeneralFunctions.simpleMoveToNextActivity_Without_history(ForgetPassword.class, context);
break;
}
}
//Listener part
@Override
public <IResponse, IMethod> void processedResult(IResponse iResponse, IMethod iMethod) {
switch (iMethod.toString())
{
case "back":
finish();
break;
case "showProgress":
uiThreadHandler.sendEmptyMessage(Constants.ActivityBasicsCode.SHOWDIALOG);
break;
case "hideProgress":
uiThreadHandler.sendEmptyMessage(Constants.ActivityBasicsCode.HIDEDIALOG);
break;
}
}
//Handler part
private class UIThreadHandler extends Handler {
@Override
public void handleMessage(Message msg)
{
switch (msg.what) {
case Constants.ActivityBasicsCode.SETERROR:
{
CustomException exception=(CustomException)msg.obj;
TextView editText=exception.getTextView();
editText.setError(exception.getMessage());
editText.setFocusable(true);
editText.requestFocus();
}
break;
case Constants.ActivityBasicsCode.HIDEDIALOG:
hideProgressDialog(Constants.DialogConstants.Transparent);
break;
case Constants.ActivityBasicsCode.SHOWDIALOG: {
DTDialog dtDialog=DTDialog.newInstance();
showProgressDialog(dtDialog,Constants.DialogConstants.Transparent);
}
break;
case Constants.ActivityBasicsCode.VALIDATION: {
//Here validation is done in separate thread
new Thread(new Runnable() {
@Override
public void run() {
try
{
if (Validation.validate(Login.this))
GeneralFunctions.moveToNextActivity(MainActivity.class, context);
} catch (CustomException e)
{
//Catch exception for validation is thrown here
Message message = uiThreadHandler.obtainMessage(Constants.ActivityBasicsCode.SETERROR);
message.obj=e;
uiThreadHandler.sendMessage(message);
}finally {
uiThreadHandler.sendEmptyMessage(Constants.ActivityBasicsCode.HIDEDIALOG);
}
}
}).start();
break;
}
}
super.handleMessage(msg);
}
}
public final<T extends DialogFragment> void showProgressDialog(T currentDialog,String tagName)
{
FragmentManager fragmentManager =getSupportFragmentManager();
currentDialog.show(fragmentManager, tagName);
}
public final void hideProgressDialog(String tagName)
{
FragmentManager fragmentManager =getSupportFragmentManager();
DialogFragment transparentDialog = (DialogFragment)fragmentManager.findFragmentByTag(tagName);
if (transparentDialog == null) {
return;
}
transparentDialog.dismiss();
}
}
XMLファイル
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
Android:layout_width="match_parent"
Android:layout_height="match_parent"
Android:orientation="vertical"
Android:layout_gravity="center"
Android:gravity="center">
<ImageView style="@style/imageview"
Android:layout_marginTop="@dimen/_7sdp"
Android:src="@mipmap/ic_launcher"/>
<EditText
Android:tag="@string/login_emailId_phone"
Android:layout_marginTop="@dimen/_12sdp"
style="@style/edittext"
Android:drawableLeft="@drawable/user_icon"
Android:id="@+id/login_ed_emailPhone"
Android:inputType="text"/>
<EditText
Android:tag="@string/login_password"
Android:layout_marginTop="@dimen/_12sdp"
Android:drawableLeft="@drawable/password_icon"
Android:id="@+id/login_ed_password"
Android:inputType="textPassword"
Android:hint="@string/login_password"
style="@style/edittext"/>
<TextView
Android:layout_marginTop="@dimen/_11sdp"
Android:id="@+id/login_tv_foregetPassword"
Android:text="@string/login_forgetPassword"
style="@style/textView"
Android:textColor="#606060"
Android:textStyle="normal"/>
<Button
Android:layout_marginTop="@dimen/_30sdp"
Android:id="@+id/login_bt_signin"
style="@style/button"
Android:text="@string/login_singin"
Android:background="@drawable/big_green_btn_normal"
/>
<cl.tempclick.ui.custom_view.LineThroughTextView
Android:layout_marginTop="@dimen/_12sdp"
app:Android_textColor="#606060"
Android:gravity="center"
Android:layout_width="match_parent"
Android:layout_height="wrap_content"
app:lineHeight="@dimen/_2sdp"
app:lineColor="@color/colorGray"
app:Android_textSize="@dimen/_15sdp"
app:Android_text="@string/login_or"
app:textPadding="@dimen/_10sdp"/>
<Button
Android:layout_marginTop="@dimen/_12sdp"
Android:id="@+id/login_bt_linkedin"
style="@style/button"
Android:text="@string/login_linkedin"
Android:background="@drawable/big_blue_btn_normal"
/>
<TextView
Android:layout_marginTop="@dimen/_12sdp"
Android:id="@+id/login_tv_noAccount"
Android:text="@string/login_noAccount"
style="@style/textView"
Android:textStyle="normal"
Android:textColor="#606060"
Android:layout_marginBottom="@dimen/_7sdp"/>
</LinearLayout>
<ViewStub
Android:id="@+id/login_vs_empty"
Android:layout_width="match_parent"
Android:layout_height="match_parent"
Android:layout_gravity="center"
Android:gravity="center"
Android:layout="@layout/empty_view" />
textviewメジャーの後にtextviewgetLayout()を呼び出す必要があるため、でgetLayout()を呼び出すことをお勧めします。
textview.post(new Runnable() {
@Override
public void run() {
textview.getLayout()....
}
});