Android 图片比较

Bitmap actualBitmap = ((BitmapDrawable)actualDrawable).getBitmap();
Bitmap expectedBitmap = ((BitmapDrawable)expectedDrawable).getBitmap();
public static boolean isEqual(Activity activity, Bitmap expectedBitmap, Bitmap actualBitmap) {
int nonMatchingPixels = 0;
int allowedMaxNonMatchPixels = 10;
if(expectedBitmap == null || actualBitmap == null || activity == null) {return false;}
int[] expectedBmpPixels = new int[expectedBitmap.getWidth() * expectedBitmap.getHeight()];
expectedBitmap.getPixels(expectedBmpPixels, 0, expectedBitmap.getWidth(), 0, 0, expectedBitmap.getWidth(), expectedBitmap.getHeight());
int[] actualBmpPixels = new int[actualBitmap.getWidth() * actualBitmap.getHeight()];
actualBitmap.getPixels(actualBmpPixels, 0, actualBitmap.getWidth(), 0, 0, actualBitmap.getWidth(), actualBitmap.getHeight());
if (expectedBmpPixels.length != actualBmpPixels.length) {return false;}
for (int i = 0; i < expectedBmpPixels.length; i++) {
if (expectedBmpPixels[i] != actualBmpPixels[i]) {nonMatchingPixels++;}
}
if (nonMatchingPixels > allowedMaxNonMatchPixels) {return false;}
return true;
}