Develop Reference

how to check if android going to recreate activity or destroy?

I have an android studio project. When I am rotating screen, android destroys and recreates main activity. How can I check during the destruction, if android going to recreate activity?

You can determine if the activity is finishing by user choice (user chooses to exit by pressing back for example) using isFinishing() in onDestroy.
#Override
protected void onDestroy() {
super.onDestroy();
if (isFinishing()) {
// wrap stuff up
} else {
//It's an orientation change.
}
}
Another alternative (if you're only targeting API>=11) is isChangingConfigurations.
#Override
protected void onDestroy() {
super.onDestroy();
if (isChangingConfigurations()) {
//It's an orientation change.
}
}

Override the Activity lifecycle methods to see the flow.And then use the appropriate method to check activity current state like isChangingConfigurations()
Example code snippet.
MainActivity.java
public class MainActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
#Override
protected void onStart() {
super.onStart();
Log.i(MainActivity.class.getSimpleName(),"OnStart Called");
}
#Override
protected void onRestart() {
super.onRestart();
Log.i(MainActivity.class.getSimpleName(),"OnRestart Called");
}
#Override
protected void onDestroy() {
super.onDestroy();
Log.i(MainActivity.class.getSimpleName(),"OnDestroy Called");
}
#Override
protected void onPause() {
super.onPause();
Log.i(MainActivity.class.getSimpleName(),"OnPause Called");
}
#Override
public void onConfigurationChanged(Configuration newConfig) {
super.onConfigurationChanged(newConfig);
Log.i(MainActivity.class.getSimpleName(),"OnConfiguration Changed Called");
}
}
For more details see the official page activity-lifecycle

VideoView leaks activity

I'm showing video in an app using the following code in the VideoActivity:
binding.videoView.setVideoURI(videoUri);
binding.videoView.requestFocus();
binding.videoView.start();
binding.videoView.setOnPreparedListener(new
MediaPlayer.OnPreparedListener() {
#Override
public void onPrepared(MediaPlayer mediaPlayer) {
binding.progressBar.progressOverlay.setVisibility(View.GONE);
}
});
binding.videoView.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
#Override
public void onCompletion(MediaPlayer mediaPlayer) {
binding.videoView.suspend();
binding.videoView.stopPlayback();
setResult(RESULT_OK);
finish();
}
});
binding.videoSkipButton.setOnClickListener(
new View.OnClickListener() {
#Override
public void onClick(View view) {
binding.videoView.suspend();
binding.videoView.stopPlayback();
setResult(RESULT_OK);
finish();
}
});
And after skipping / ending I get a report from leak canary that my activity:
How do I eliminate this leak?
I've also seen this question with similar leakcanary trace: VideoView memory leak
But there the problem was with ButterKnife unbinding. Do I need to do something similar with DataBinding?

Add VideoView's pause(), resume() and stopPlayback() in your activity's onPause(), onResume() and onDestroy() methods:
#Override
protected void onResume() {
binding.videoView.resume();
super.onResume();
}
#Override
protected void onPause() {
binding.videoView.pause();
super.onPause();
}
#Override
protected void onDestroy() {
binding.videoView.stopPlayback();
super.onDestroy();
}
Hope it will help you.
Thanks :)

Android videoview resume not working

I have been working on playing videos using VideoView in Android.
OnPause of fragment i am pausing the video and storing the seektime
#Override
public void onPause() {
super.onPause();
if (videoview != null && videoview.isPlaying()) {
videoview.pause();
seekTime = videoview.getCurrentPosition();
}
}
OnResume i am trying to resume the video using -
#Override
public void onResume() {
super.onResume();
videoview.seekTo(seekTime);
//vvOnboardingVideos.resume();// this is not working for now - need to investigate
videoview.start();
}
The video plays from the beginning.
Is there anything i am doing wrong. Please suggest.

Try to reverse order of operations :
#Override
public void onResume() {
super.onResume();
videoview.start();
videoview.seekTo(seekTime);
}

try this:
save the video position when onpause() called
// This gets called before onPause
#Override
public void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
stopPosition = videoView.getCurrentPosition();
videoView.pause();
outState.putInt("video_position", stopPosition);
}
Then in your onCreate() load the stopPosition from the bundle
#Override
protected void onCreate(Bundle args) {
super.onCreate(args);
if( args != null ) {
stopPosition = args.getInt("video_position");
}
}
Resume the video using:
#Override
public void onResume() {
super.onResume();
Log.d("Tag", "onResume");
videoView.seekTo(stopPosition);
videoView.start(); //Or use videoView.resume() if it doesn't work.
}

VideoView stopping on Dialog Open of anykind

I have a video view in an activity.
private void videoInit() {
videoView = (VideoView)findViewById(R.id.videoView);
videoView.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {
#Override
public void onPrepared(MediaPlayer mp) {
videoView.start();
mp.setLooping(true);
}
});
videoView.setVideoPath("android.resource://com.aplos.ideliver2/raw/iphone_inner_animation");//src/main/res/raw
videoView.requestFocus();
videoView.start();
}
This is my function, and the dialog is opened with an intent to the other class.
This is executed for a scenario.
private void processError(Response mResponse) {
try {
AlertDialog.strMessage = mResponse.getResponseMessage();
AlertDialog.strTitle = "Alert";
AlertDialog.strButtonTitle = "OK";
startActivity(new Intent(context, AlertDialog.class));
overridePendingTransition(R.anim.fade_in, R.anim.fade_out);
} catch (Exception e) {
H.Handle(e);
}
}
When the dialog is opened the video stops. I want to have the video running continuosly.
#Override
public void onBackPressed() {
super.onBackPressed();
videoView.stopPlayback();
}
#Override
protected void onPause() {
super.onPause();
videoView.stopPlayback();
}
#Override
protected void onResume() {
super.onResume();
videoView.start();
}
#Override
protected void onRestoreInstanceState(Bundle savedInstanceState) {
super.onRestoreInstanceState(savedInstanceState);
videoView.start();
}

Remove these two
#Override
protected void onPause() {
super.onPause();
videoView.stopPlayback();
}
#Override
protected void onResume() {
super.onResume();
videoView.start();
}
And add
#Override
protected void onStop() {
super.onPause();
videoView.stopPlayback();
}
#Override
protected void onRestart() {
super.onResume();
videoView.start();
}
Because onPause will be called when your window is even partially obscured, like a pop up appearing.
Edit: Since you asked me to explain why it works you need to understand the activty life cycle. OnStart() will be called when the activity is completly not visible to the user, but onPause will be called when the activity is even partially invisible, like an alert box showing on the activity, or when you pull down to see your notifications etc.
To know more about activity life cycle check this out

Use
onStop() instead of onPause()
and
onRestart() instead of onResume()
Good Luck...!

MediaController is not shown after onResume()

This is my activity for a video player:
public class myActivity extends Activity
implements MediaPlayer.OnPreparedListener,
MediaController.MediaPlayerControl {
....
}
and in its onPause method I don't release the MediaPlayer and I just pause it:
#Override
protected void onPause() {
super.onPause();
lastPlaybackInfo.IsPlaying = mMediaPlayer.isPlaying();
mMediaPlayer.pause();
lastPlaybackInfo.SeekPosition = mMediaPlayer.getCurrentPosition();
}
and in onResume
#Override
protected void onResume() {
super.onResume();
if (mMediaPlayer != null) {
if (lastPlaybackInfo.IsPlaying) {
mMediaPlayer.start();
} else {
mMediaPlayer.seekTo(lastPlaybackInfo.SeekPosition);
}
mMediaController.show();
}
}
and the onTouchEvent:
#Override
public boolean onTouchEvent(MotionEvent event) {
mMediaController.show();
return true;
}
I have two problems:
The first problem is that the once the app is resumed, the MediaController which is tied to MediaPlayer is shown only one time (the call in onResume), and after that, the calls in onTouchEvent doesn't show MediaController.
The second one is that, if MediaPlayer was paused before app getting paused, after resuming the app, the SurfaceView tied to MediaPlayer is black and doesn't show the very last rendered frame.

In fact I found out if we run the code inside onResume with a delay to let the layout refresh itself, both of the problems would get resolved.
Here's how:
protected void onResume() {
super.onResume();
try {
if (IsMediaReady && IsSubtitleReady) {
if (mMediaPlayer != null) {
handler.postDelayed(new Runnable() {
#Override
public void run() {
if (lastPlaybackInfo.IsPlaying) {
mMediaPlayer.start();
} else {
mMediaPlayer.seekTo(lastPlaybackInfo.SeekPosition);
}
mMediaController.show();
}
}, 100);
}
}
} catch (NullPointerException e) {
Log.e(TAG, "Exception in resume");
}
}