Why This Image-switching Code Has Memory Leak?

I'm write a simple android application, which uses an ImageView to display an image. When click on a button, it will generate a new bitmap based on current image, and replace the o

Solution 1:

I'm not sure quite how Bitmap.createBitmap() works, but given the error is to do with the 'bitmap size'

java.lang.OutOfMemoryError: bitmap size exceeds VM budget

I would presume that the image is increasing in size with each click. Hence the error occurring on the 5th click.

I would suggest that the size increase is to do with the rotation matrix. When the image is rotated it appears that it isn't cropping the rotated image to the image width and height, but rather increasing the size of the image.

You would have to try some alternative methods for manipulating the rotation within the w/h bounds you desire.

An answer (two down) to this question shows how to crop the rotated image if you so wished. Android: How to rotate a bitmap on a center point

RectFrectF=newRectF(0, 0, source.getWidth(), source.getHeight());
matrix.mapRect(rectF);