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How to fix error in Dialog after dismiss and click again?

I'm developing webview app, the problem in OnJsAlert that when i click on the Dialog it opens after dismiss it and click again it stop my app, for sorry i can't get the problem from debugging.
This is my MainActivity.class
#Override
public boolean onJsAlert(WebView view, String url, final String alertSource, final JsResult alertResult) {
alertDialog.requestWindowFeature(Window.FEATURE_NO_TITLE);
alertDialog.setContentView(R.layout.activity_alert);
alertDialog.setCancelable(true);
TextView alertMessage = alertDialog.findViewById(R.id.alert_text);
alertMessage.setText(alertSource);
alertDialog.getWindow().setBackgroundDrawable(new ColorDrawable(Color.TRANSPARENT));
alertDialog.setOnCancelListener(new DialogInterface.OnCancelListener() {
#Override
public void onCancel(DialogInterface dialog) {
alertResult.cancel();
}
});
alertDialog.show();
return true;
}
Edited : Log
W/InputEventReceiver: Attempted to finish an input event but the input event receiver has already been disposed.
E/ViewRootImpl: sendUserActionEvent() mView == null
W/System.err: android.util.AndroidRuntimeException: requestFeature() must be called before adding content
W/System.err: at com.android.internal.policy.impl.PhoneWindow.requestFeature(PhoneWindow.java:331)
at android.app.Dialog.requestWindowFeature(Dialog.java:1057)
at com.xcoder.stepview.MainActivity$4.onJsAlert(MainActivity.java:285)
at com.android.webview.chromium.WebViewContentsClientAdapter.handleJsAlert(WebViewContentsClientAdapter.java:606)
at com.android.org.chromium.android_webview.AwContentsClientBridge.handleJsAlert(AwContentsClientBridge.java:73)
at com.android.org.chromium.base.SystemMessageHandler.nativeDoRunLoopOnce(Native Method)
at com.android.org.chromium.base.SystemMessageHandler.handleMessage(SystemMessageHandler.java:27)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:146)
at android.app.ActivityThread.main(ActivityThread.java:5641)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
W/System.err: at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1288)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1104)
at dalvik.system.NativeStart.main(Native Method)
A/libc: Fatal signal 6 (SIGABRT) at 0x00002c6d (code=-6), thread 11373 (xcoder.stepview)
Application terminated.

Your alertDialog is created before public boolean onJsAlert(...) method called and when it's called second time you got AndroidRuntimeException: requestFeature() must be called before adding content because of you can't use requestWindowFeature() with created dialog. You have to create new instance of dialog in this method or reuse global defined dialog.

Crash caused by animation cancel()

I have 2 animations, slide[1] and slide[3], and when I try to cancel them when the animation repeats itself, it causes a crash. here is some relevant code:
slide[1].setDuration(500); slide[1].setStartDelay(500);
slide[3].setDuration(500); slide[3].setStartDelay(500);
slide[1].addListener(new Animator.AnimatorListener() {
#Override
public void onAnimationStart(Animator animation) {
}
#Override
public void onAnimationCancel(Animator animation) {
}
#Override
public void onAnimationRepeat(Animator animation) {
if (!start) {
table[2][2].setBackgroundResource(R.drawable.black);
slide[1].setDuration(1000);
slide[1].setStartDelay(0);
slide[3].setDuration(1000);
slide[3].setStartDelay(0);
slide[1].removeAllListeners();
slide[3].cancel();
slide[1].cancel();
}
}
#Override
public void onAnimationEnd(Animator animation) {
}
}); slide[1].start(); slide[3].start();
The line which causes the crash is "slide[1].cancel();", and I don't know why.
Apparently the crash is being caused when the phone is running on JellyBean, but not Marshmallow for example.
How can I solve this problem?
Thanks!
UPDATE: here is the logcat:
03-13 16:18:01.943 1623-1623/com.example.ohad.squerz E/AndroidRuntime: FATAL EXCEPTION: main
java.lang.IndexOutOfBoundsException: Invalid index 0, size is 0
at java.util.ArrayList.throwIndexOutOfBoundsException(ArrayList.java:251)
at java.util.ArrayList.get(ArrayList.java:304)
at android.animation.ValueAnimator$AnimationHandler.doAnimationFrame(ValueAnimator.java:603)
at android.animation.ValueAnimator$AnimationHandler.run(ValueAnimator.java:639)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:725)
at android.view.Choreographer.doCallbacks(Choreographer.java:555)
at android.view.Choreographer.doFrame(Choreographer.java:524)
at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:711)
at android.os.Handler.handleCallback(Handler.java:615)
at android.os.Handler.dispatchMessage(Handler.java:92)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:4745)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
at dalvik.system.NativeStart.main(Native Method)

This crash has been fixed in AOSP in this commit.
If you want to support API 16, you need to cancel your animations somewhere else than in onAnimationUpdate/onAnimationRepeat.
In your case (if it matters, because this answer comes a long time after your question), you probably want to avoid the repeat on your first animator, using setRepeatCount(0).

My AsyncTask in another class is causing NullPointerException when it is called in this class

I am quite new to android development and I am facing a NullPointerException when I am trying to call an AsyncTask which is an inner class in another class.
I believe it is the way I am instantiating it but this is what I have:
// This onClick is in my adapter class - which is a separate Java File and class
#Override
public void onClick(View v) {
UploadRes uploadRes = new UploadRes();
UploadRes.UploadResConfirm uploadResConfirm = uploadRes.new UploadResConfirm(v.getContext());
uploadResConfirm.execute(fileName, filePath);
}
public class UploadResConfirm extends AsyncTask<String, String, String> {
Dialog dialog;
Context context;
public UploadResConfirm(Context context){
this.context = context;
}
#Override
protected void onPreExecute(){
dialog = new Dialog(UploadRes.this);
dialog.setTitle("Currently uploading");
dialog.show();
}
I believe it has got something to do with the dialog box itself being instantiated in the AsyncTask class.
The error stack trace on Logcat - its the Dialog, I think its in the wrong place...
java.lang.NullPointerException
at codeman.androapp.UploadRes$UploadResConfirm.onPreExecute(UploadRes.java:246)
at android.os.AsyncTask.executeOnExecutor(AsyncTask.java:586)
at android.os.AsyncTask.execute(AsyncTask.java:534)
at android.view.View.performClick(View.java:4240)
at android.view.View$PerformClick.run(View.java:17721)
at android.os.Handler.handleCallback(Handler.java:730)
at android.os.Handler.dispatchMessage(Handler.java:92)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:5103)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:525)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
at dalvik.system.NativeStart.main(Native Method)
Some help if any would be much obliged.

Instead of dialog = new Dialog(UploadRes.this);
Try
dialog = new Dialog(context);
your are passing a wrong context to create dialog.

java.lang.VerifyError while instantiating a fragment

In android versions earlier than Lollipop, I keep getting the VerifyError while trying to instantiate a fragment, leading to an app crash. Can someone explain to me the cause of this error?
12-19 17:46:52.510 28238-28238/com.greeblu.tootl2 E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: com.greeblu.tootl2, PID: 28238
java.lang.VerifyError: com/greeblu/tootl2/fragment/ProfileGridFragment
at com.greeblu.tootl2.activity.ProfileActivity.launchGridFragment(ProfileActivity.java:289)
at com.greeblu.tootl2.fragment.ProfileOverlayFragment$3.onClick(ProfileOverlayFragment.java:123)
at android.view.View.performClick(View.java:4438)
at android.view.View$PerformClick.run(View.java:18439)
at android.os.Handler.handleCallback(Handler.java:733)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5034)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:795)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:611)
at dalvik.system.NativeStart.main(Native Method)
This is how I'm calling the fragment for older android versions:
FragmentTransaction ft = getFragmentManager().beginTransaction();
ft.replace(R.id.profileContainer, new ProfileGridFragment(),fragmentTag); //Replaces the Fragment C previously in the right_container with a new Fragment B
ft.commit();
Edit:
The code for the onClick call is as follows. It is called from another fragment in the same activity
picContainer.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
((ProfileActivity) getActivity()).launchGridFragment(overlayDp, "all");
}
});

I've encountered this exact error because I had a try-catch block with exception class that is unavailable on old android versions. The block wasn't even in the constructor, it was in one of the onClick methods so the code wasn't even executed, but nevertheless app was always crashing with VerifyError as soon as I was trying to create the fragment.
Solver it by changing clause block with instanceof check:
Crashing:
try {
...
} catch (FileUriExposedException e) {
...
}
Works ok:
try {
...
} catch (Exception e) {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N && e instanceof FileUriExposedException) {
...
}
}

Are you using the support Fragment class from android.support.v4.app.Fragment? If so you need to be calling
getSupportFragmentManager()
instead of
getFragmentManager()
Note that the Fragment class from android.app.Fragment is now deprecated.

How can I access a function in another class?

I am developing an app for android that has to access another class, but i don't know why it doesn't work.
When run the App in android 2.3.3 it force closes, and I don't understand why. I think that the method is correct.
Log in the force close the phone android:
> app_vercode:1
device_model:u8800
build_version:111180
condition:1
processName:beta.tester
pid:13277
uid:10088
tag:null
shortMsg:java.lang.NullPointerException
longMsg:java.lang.NullPointerException: Unable to start activity ComponentInfo{beta.tester/beta.tester.BetaTesterActivity}: java.lang.NullPointerException
stackTrace:java.lang.RuntimeException: Unable to start activity ComponentInfo{beta.tester/beta.tester.BetaTesterActivity}: java.lang.NullPointerException
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1664)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1680)
at android.app.ActivityThread.access$1500(ActivityThread.java:117)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:931)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:130)
at android.app.ActivityThread.main(ActivityThread.java:3703)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:507)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:841)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:599)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.NullPointerException
at beta.tester.BetaTesterActivity.onCreate(BetaTesterActivity.java:23)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1628)
... 11 more
Detail logs:
EDIT: This code already is correctly.
The code:
class BetaTesterActivity:
package beta.tester;
import android.app.Activity;
import android.os.Bundle;
import android.widget.TextView;
public class BetaTesterActivity extends Activity {
public TextView text1;
private teste cmd;
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
text1 = (TextView) findViewById(R.id.text1);
//Start the function
cmd = new teste();
cmd.start(this);
}
}
class teste:
package beta.tester;
public class teste {
//Function that I will start
public void start(BetaTesterActivity zav){
zav.text1.setText("Hello");
}
//
}

In class teste, you are creating a new BetaTesterActivity, which is useless. You need to use the instance created by the framework. Change your class teste to this:
public class teste {
//Function that I will start
public void start(BetaTesterActivity zav){
zav.text1.setText("Hello");
}
}
Then in the onCreate method of your activity class, you need to initialize cmd and then call start like this:
cmd.start(this);