How to Minimize Leaks in Activity in Android

Question

I am loading lots of bitmaps in every activity. I was getting lots of “java.lang.OutOfMemoryError" after switching between activities. My app is mostly on potrait orientation.

I tried many solutions and found a relatively better approach in one of the solutions on this website.

First, set the “id” attribute on the parent view of your XML layout:

    <?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
 android:layout_width="fill_parent"
 android:layout_height="fill_parent"
 android:id="@+id/RootView"
 >

Then, in the onDestroy() method of your Activity, call the unbindDrawables() method passing a refence to the parent View and then do a System.gc()

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

    unbindDrawables(findViewById(R.id.RootView));
    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();
        }
    }

But it does not completely remove java.lang.OutOfMemoryError. Now I randomly get this memory exception. I have read a few posts stating that for completely getting rid of this issue you have to load bitmaps from code and release them in activity onDestroy which in my case is not a practical solution because I am loading lots of bitmaps.

Does someone have any better solution to this problem?

i have set my images through xml only and that images are in drawable folder. — Rishi, Feb 20 '13 at 05:33
i have got the same error but it tried to use Bitmap to set images to imageview and trying to recycle it. Still getting OOM! — Manoj, Feb 20 '13 at 09:44
I think the problem is you rely on onDestroy() which is rarely, if at all, called. The documentation reads you are not guaranteed onDestroy will be called, sometimes the system just kills your app without even calling it. Maybe you should have placed this code in onPause/onStop — Kaloyan Roussev, Mar 07 '14 at 09:18

How to Minimize Leaks in Activity in Android

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