Very strange exception ,IndexOutOfBoundsException in 4.4 but working well in 5.0 : Android

Question

in detail,

i have class A and in that class i have

  public static ArrayList<String> video_title = new ArrayList<String>();

and all the values of video_title are filled in class A

than i am going to class B from class A and accessing ArrayList as A.video_title.get(index).. ok thats working fine as excepted..

Now real problem occurs, I am opening Android default web view from link of class B and when i come back to my Activity (obviously when i press back from web view it opens my last activity class B), it gives IndexOutOfBoundsException and says that Invalid index 2, size is 0.

More strange is that, it gives error in Android 4.4.4 but working fine in

Android 5.0.2

my code of both class as below (i am sharing only necessary code because my app have some sensitive code ),

Class A:

public class A extends Activity{

public static ArrayList<String> video_title = new ArrayList<String>();

@Override
protected void onCreate(Bundle savedInstanceState)
{
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);
    this.requestWindowFeature(Window.FEATURE_NO_TITLE);
    setContentView(R.layout.list_of_video);


    new AsyncTask<Void, Void, Void>()
    {


        protected void onPreExecute()
        {
            video_title.clear();

        };

        @Override
        protected Void doInBackground(Void... params)
        {
            // TODO Auto-generated method stub

            try
            {
                JSONObject obj = Handle_json.HTTPGet(“here is my url from data is come“);

                nextPageToken = obj.getString("nextPageToken");

                JSONArray items = obj.getJSONArray("items");

                for (int i = 0; i < items.length(); i++)
                {

                    JSONObject jobj = items.getJSONObject(i);

                    video_title.add("" + omg.getString("title"));

                }

            }
            catch (Exception e)
            {
                e.printStackTrace();
            }

            return null;
        }

        protected void onPostExecute(Void result)
        {
            pDialog.dismiss();

        };

    }.execute();

}



@Override
public void onBackPressed()
{
    // TODO Auto-generated method stub
    super.onBackPressed();
    overridePendingTransition(R.drawable.in2, R.drawable.out2);
  }
 }

Class B:

public class B extends YouTubeFailureRecoveryActivity implements OnFullscreenListener{

TextView video_detail_title, video_detail_title2, video_detail_views,
    like_count, dislike_count, video_detail_desc;
ImageView video_detail_iv;

ProgressBar video_detail_pb;

int position = 0;

RelativeLayout main_content;

private View videoBox;
private View closeButton;
YouTubePlayerView youTubeView;

@Override
protected void onCreate(Bundle savedInstanceState)
{
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);
    this.requestWindowFeature(Window.FEATURE_NO_TITLE);
    setContentView(R.layout.video_detail);

    final Bundle bundle = getIntent().getExtras();
    position = bundle.getInt("position");

    main_content = (RelativeLayout) findViewById(R.id.main_content);

    videoBox = findViewById(R.id.video_box);
    closeButton = findViewById(R.id.close_button);
    videoBox.setVisibility(View.INVISIBLE);

    closeButton.setOnClickListener(new OnClickListener()
    {

        @Override
        public void onClick(View v)
        {
            // TODO Auto-generated method stub
            onClickClose();
        }
    });

    findViewById(R.id.video_detail_iv).setOnClickListener(new OnClickListener()
    {

        @Override
        public void onClick(View v)
        {
            // TODO Auto-generated method stub
            if (videoBox.getVisibility() != View.VISIBLE)
            {
                if (getResources().getConfiguration().orientation == Configuration.ORIENTATION_PORTRAIT)
                {
                    // Initially translate off the screen so that it can be animated in from below.
                    videoBox.setTranslationY(videoBox.getHeight());
                }
                videoBox.setVisibility(View.VISIBLE);
            }

            // If the fragment is off the screen, we animate it in.
            if (videoBox.getTranslationY() > 0)
            {
                videoBox.animate().translationY(0).setDuration(300);
            }

        }
    });


    youTubeView = (YouTubePlayerView) findViewById(R.id.youtube_view);
    youTubeView.initialize(DeveloperKey.DEVELOPER_KEY, this);

    video_detail_title = (TextView) findViewById(R.id.video_detail_title);
    video_detail_title.setText("" + A.video_title.get(position));


}

@Override
public void onBackPressed()
{
    // TODO Auto-generated method stub
    super.onBackPressed();
    overridePendingTransition(R.drawable.in2, R.drawable.out2);
}

@Override
public void onInitializationSuccess(Provider arg0, YouTubePlayer arg1, boolean arg2)
{
    // TODO Auto-generated method stub
    if (!arg2)
    {
        arg1.cueVideo(Show_List_Of_Video.video_id.get(position));
    }
}

@Override
protected Provider getYouTubePlayerProvider()
{
    // TODO Auto-generated method stub
    return (YouTubePlayerView) findViewById(R.id.youtube_view);
}

private boolean isFullscreen;

@Override
public void onFullscreen(boolean arg0)
{
    // TODO Auto-generated method stub
    this.isFullscreen = arg0;

    closeButton.setVisibility(isFullscreen ? View.GONE : View.VISIBLE);
    if (isFullscreen)
    {
        videoBox.setTranslationY(0);

    }

}

public void onClickClose()
{
    ViewPropertyAnimator animator = videoBox.animate().translationYBy(videoBox.getHeight()).setDuration(300);
    runOnAnimationEnd(animator, new Runnable()
    {
        @Override
        public void run()
        {
            videoBox.setVisibility(View.INVISIBLE);
        }
    });
}

@TargetApi(16)
private void runOnAnimationEnd(ViewPropertyAnimator animator, final Runnable runnable)
{
    if (Build.VERSION.SDK_INT >= 16)
    {
        animator.withEndAction(runnable);
    }
    else
    {
        animator.setListener(new AnimatorListenerAdapter()
        {
            @Override
            public void onAnimationEnd(Animator animation)
            {
                runnable.run();
            }
        });
    }
  }

 }

Added After :

i found that all variable of all activity is cleared when i back to the activity B. why this is happening? even i declare variable as a static. what is going wrong?

Answer 1

When you Pause your activity android kitkat 4.4.4 free memory by removing your arraylist. You can declare a static arraylist to avoid this problem. or on onPause save arraylist in preferences and load back on onResume.