Android: Bitmap out of memory error

Question

I'm facing the following problem: When my app is destroyed and recreated several times (e.g. by locking and unlocking the screen), it crashes with the following error:

02-01 19:24:12.000: E/AndroidRuntime(22362): java.lang.OutOfMemoryError: (Heap Size=62755KB, Allocated=55237KB)
02-01 19:24:12.000: E/AndroidRuntime(22362):    at android.graphics.Bitmap.nativeCreateScaledBitmap(Native Method)
02-01 19:24:12.000: E/AndroidRuntime(22362):    at android.graphics.Bitmap.createScaledBitmap(Bitmap.java:744)

Now, I've read several posts about this error and how to fix it but none of them seemed to help so far. So here's how I deal with images in my app: My App has only one activity that looks somewhat like this:

public class MainActivity extends Activity {

static MenuView mv;

public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    [...]
    mv = (MenuView) findViewById(R.id.menuview);
    mv.setOnClickListener(new KlickLauscher());
}

public void onDestroy() {
    super.onDestroy();
    mv.destroy(); 
    System.gc();
}

The MenuView looks somewhat like this:

public class MenuView extends View {

MyBitmap button;

public MenuView(Context context, AttributeSet attrs) {
    super(context, attrs);
    initialize();
}

public void initialize() {
     button = new MyBitmap("R.drawable.bitmap1");
}

public void onDraw(Canvas c) {
    c.drawBitmap(button.getBmp(),0,0,mPaint);
}   

public void destroy() {
    button.destroy();
}

And, last but not least, the class MyBitmap looks like this:

class MyBitmap {

Bitmap bmp;

 public MyBitmap(int r) {
  bmp = MyBitmap.createBmp(r);
 }

 public Bitmap getBmp() {
  return bmp;
 }

 static Bitmap createBmp(int r) {
  // Some irrelevant code
  return Bitmap.createScaledBitmap(BitmapFactory.decodeResource(mv.getContext().getResources(),r), width, height, true);
 }

 public void destroy() {
  bmp.recycle();
 }
}

Every single Bitmap in my app is realized using this MyBitmap class, and every single one of them gets recycled when onDestroy() is called. Long story short: Has anyone any idea what else could cause the error?

onDestroy is not guaranteed to be called. Try recycling in onPause() instead. — Simon, Feb 02 '13 at 22:27
I've used Log.e(...) to find out when onDestroy is called, and so far, it has always been called when I locked my app. Also, button.getBmp().isRecycled() returns true. — vauge, Feb 02 '13 at 22:33
OK, see the answer here http://stackoverflow.com/questions/9461364/exception-in-unbinddrawables. The question is not relevant but the answer may be. — Simon, Feb 02 '13 at 22:46

score 0 · Answer 1 · edited Mar 14 '14 at 15:18

0

Try to downsample the bitmap and use the correct bitmap format according to your needs, as written here.

Also, I think the code in createBmp actually creates 2 bitmaps, so you could recycle the one that you don't use.

Why do you scale the bitmap in the first place? You can set the imageView to scale it instead.

edited Mar 14 '14 at 15:18

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answered Feb 02 '13 at 22:33

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Thanks for the link! But how to recycle the second bitmap created in createBmp? – vauge Feb 02 '13 at 22:42
First , i think you don't need to scale the bitmap at all this way . Second, if you insist of doing so , simply have a reference to the old bitmap (created by decodeResource) and the new one (created by createScaledBitmap ) . After scaling , you can recycle the old one. – android developer Feb 02 '13 at 22:45

Android: Bitmap out of memory error

1 Answers1