Rotating images on android. Is there a better way?

Question

I have an app that displays quite a few images for the user, and we\'ve been seeing a lot of error reports with OutOfMemoryError exception.

What we curr

Answer 1

2 methods of rotating a large image:

1. using JNI , like on this post.

2. using a file : it's a very slow way (depending on the input and the device , but still very slow) , which puts the decoded rotated image into the disk first , instead of putting it into the memory .

code of using a file is below:

private void rotateCw90Degrees()
  {
  Bitmap bitmap=BitmapFactory.decodeResource(getResources(),INPUT_IMAGE_RES_ID);
  // 12 => 7531
  // 34 => 8642
  // 56 =>
  // 78 =>
  final int height=bitmap.getHeight();
  final int width=bitmap.getWidth();
  try
    {
    final DataOutputStream outputStream=new DataOutputStream(new BufferedOutputStream(openFileOutput(ROTATED_IMAGE_FILENAME,Context.MODE_PRIVATE)));
    for(int x=0;x=0;--y)
        {
        final int pixel=bitmap.getPixel(x,y);
        outputStream.writeInt(pixel);
        }
    outputStream.flush();
    outputStream.close();
    bitmap.recycle();
    final int newWidth=height;
    final int newHeight=width;
    bitmap=Bitmap.createBitmap(newWidth,newHeight,bitmap.getConfig());
    final DataInputStream inputStream=new DataInputStream(new BufferedInputStream(openFileInput(ROTATED_IMAGE_FILENAME)));
    for(int y=0;y