I wrote a sample application which rotates and scales a bitmap on
clicking a key. When the bitmap is large (1280x1024) I quickly run
into an OutOfMemory exception at CreateBitmap and I need to Force
Close the application. No issues with smaller bitmaps.
I have already tried using bitmap.recycle and setting the bitmap to
null, but the memory does not get freed up. I have seen multiple posts
with similar issues, but could not find one that solves my issue. Do I
need to force the GC at some point? Here is the code I am using:
public class TransformAndroid extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
LinearLayout linLayout = new LinearLayout(this);
mBitmapOrg = BitmapFactory.decodeResource(getResources(),
R.drawable.sample);
mScaleWidth = 0.1f;
mScaleHeight = 0.1f;
mRotateAngle = 0;
mImageView = new ImageView(this);
TransformThePicture();
// center the Image
mImageView.setScaleType(ScaleType.CENTER);
// add ImageView to the Layout
linLayout.addView(mImageView,
new LinearLayout.LayoutParams(
LayoutParams.FILL_PARENT,
LayoutParams.FILL_PARENT
)
);
// set LinearLayout as ContentView
setContentView(linLayout);
}
private void TransformThePicture()
{
Matrix matrix = new Matrix();
matrix.postScale(mScaleWidth, mScaleHeight);
matrix.postRotate(mRotateAngle);
int width = mBitmapOrg.getWidth();
int height = mBitmapOrg.getHeight();
mResizedBitmap = Bitmap.createBitmap(mBitmapOrg, 0, 0,
width, height, matrix, true);
mImageView.setImageBitmap(mResizedBitmap);
mImageView.invalidate();
}
public boolean onKeyDown(int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_DPAD_CENTER) {
mScaleWidth += 0.08;
mScaleHeight += 0.05;
mRotateAngle += 5;
if (mScaleWidth >= 1.0f) mScaleWidth = 0.1f;
if (mScaleHeight >= 1.0f) mScaleHeight = 0.1f;
if (mRotateAngle >= 90) mRotateAngle = 0;
mResizedBitmap.recycle();
TransformThePicture();
return (true);
}
return super.onKeyDown(keyCode, event);
}
private Bitmap mBitmapOrg;
private float mScaleWidth;
private float mScaleHeight;
private int mRotateAngle;
private ImageView mImageView;
private Bitmap mResizedBitmap;
}
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