I made a test about memory comsumption loading bitmaps. It runs fine on a
device - it doesn't occupy even 2 mb, but on the emulator it soon occupies
20 mb.
Both the device and the emulator have resolution 480 x 800 and both are
running Android 2.3.3. In both cases, I also outputted the dimenstions of
the loaded bitmaps, and they are the same - 640 x 588.
This is the test class:
public class TestActivity extends Activity {
ImageView imageView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
showDeviceResolution();
Log.d("memory", "stats before view");
showMemoryStats();
setContentView(R.layout.mylayout);
Log.d("memory", "stats after view");
showMemoryStats();
imageView = (ImageView)findViewById(R.id.image);
}
@Override
public void onWindowFocusChanged(boolean hasFocus) {
Log.d("memory", "stats before animation");
showMemoryStats();
initTest();
super.onWindowFocusChanged(hasFocus);
}
private void initTest() {
Drawable b1 = getResources().getDrawable(R.drawable.b1);
Log.d("test", "bitmap1 dim: " + ((BitmapDrawable)b1).getBitmap().getWidth()
+ " x " + ((BitmapDrawable)b1).getBitmap().getHeight());
imageView.setImageDrawable(b1);
showMemoryStats();
Drawable b2 = getResources().getDrawable(R.drawable.b2);
Log.d("test", "bitmap2 dim: " + ((BitmapDrawable)b2).getBitmap().getWidth()
+ " x " + ((BitmapDrawable)b2).getBitmap().getHeight());
imageView.setImageDrawable(b2);
showMemoryStats();
Drawable b3 = getResources().getDrawable(R.drawable.b3);
imageView.setImageDrawable(b3);
showMemoryStats();
Drawable b4 = getResources().getDrawable(R.drawable.b4);
imageView.setImageDrawable(b4);
showMemoryStats();
Drawable b5 = getResources().getDrawable(R.drawable.b5);
imageView.setImageDrawable(b5);
showMemoryStats();
Drawable b6 = getResources().getDrawable(R.drawable.b6);
imageView.setImageDrawable(b6);
showMemoryStats();
Drawable b7 = getResources().getDrawable(R.drawable.b7);
imageView.setImageDrawable(b7);
showMemoryStats();
Drawable b8 = getResources().getDrawable(R.drawable.b8);
imageView.setImageDrawable(b8);
showMemoryStats();
Drawable b9 = getResources().getDrawable(R.drawable.b9);
imageView.setImageDrawable(b9);
showMemoryStats();
Drawable b10 = getResources().getDrawable(R.drawable.b10);
imageView.setImageDrawable(b10);
showMemoryStats();
Drawable b11 = getResources().getDrawable(R.drawable.b11);
imageView.setImageDrawable(b11);
showMemoryStats();
Drawable b12 = getResources().getDrawable(R.drawable.b12);
imageView.setImageDrawable(b12);
showMemoryStats();
Drawable b13 = getResources().getDrawable(R.drawable.b13);
imageView.setImageDrawable(b13);
showMemoryStats();
Drawable b14 = getResources().getDrawable(R.drawable.b14);
imageView.setImageDrawable(b14);
showMemoryStats();
Drawable b15 = getResources().getDrawable(R.drawable.b15);
imageView.setImageDrawable(b15);
showMemoryStats();
Drawable b16 = getResources().getDrawable(R.drawable.b16);
imageView.setImageDrawable(b16);
showMemoryStats();
Drawable b17 = getResources().getDrawable(R.drawable.b17);
imageView.setImageDrawable(b17);
showMemoryStats();
}
public static void showMemoryStats() {
double nativeUsage = Debug.getNativeHeapAllocatedSize();
Log.i("memory", "nativeUsage: " + (nativeUsage / 1048576d));
}
public void showDeviceResolution() {
DisplayMetrics dm = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(dm);
String str = "resolution: " + dm.widthPixels + " x " + dm.heightPixels;
Log.d("memory", "resolution: " + str);
}
}
On the device the native usage increments only a bit each time, and as said
at the end is still under 2mb, on the other side the emulator loads more
than 1mb each time and at the end runs out of memory, because it loaded
more than 20mb...
Can somebody explain me what's going on here...
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