Question

I am developing an app that uses a kind of local background. The idea is to make this changable. I manage to change the “background” using this code.

Bitmap bMap = BitmapFactory.decodeFile(sharedPreferences.getString("PICTURE", ""));
        Drawable d =new BitmapDrawable(bMap);
        bac.setBackgroundDrawable(d);
        } 

The problem is that each time i return to the “background screen” the app crashes because of OutOfMemoryError. Then it shows the new background. I need some sort of code that makes that the app does not crash. I manage to this in a ImageView but not in LinearLayout. For ImageView I use this code:

Bitmap bMap = BitmapFactory.decodeFile(sharedPreferences.getString("PICTURE", ""));
    image.setImageBitmap(bMap);

And to avoid it from crashing:

@Override
protected void onPause() {
super.onPause();

unbindDrawables(findViewById(R.id.iv_pic));
System.gc();

}

private void unbindDrawables(View view) {
    if (view.getBackground() != null) {
    view.getBackground().setCallback(null);
    }
    if (view instanceof ViewGroup) {
        for (int i = 0; i < ((ViewGroup) view).getChildCount(); i++) {
        unbindDrawables(((ViewGroup) view).getChildAt(i));
        }
    ((ViewGroup) view).removeAllViews();
    }
}
@Override
protected void onDestroy() {
super.onDestroy();

unbindDrawables(findViewById(R.id.iv_pic));
System.gc();

}

How do I do the same for a LinearLayout?

Answer 1

There are a lot of questions asked on SO about the OOM exception and how to deal with it. Please search the forum before posting a question.

Some notes:

1. You can release the memory consumed by a Bitmap using the recycle method (in your code, you can call bMap.recycle())
2. You can retrieve the reference to your LinearLayout using findViewById and pass that to the unbindDrawables like unbindDrawables(findViewById(R.id.myLinearLayoutId));