cut the portion of bitmap [duplicate]

Answer 1

Easiest way I am aware of is to use XFer mode processing from the Graphics package. Function below cuts region starting from (30,30) till (100,100) to the 320x480 image loaded from resources. Adapt coordinates to change dynamically:

private Bitmap cropBitmap1() {
    Bitmap bmp2 = BitmapFactory.decodeResource(this.getResources(), R.drawable.image1); 
    Bitmap bmOverlay = Bitmap.createBitmap(320, 480, Bitmap.Config.ARGB_8888);

    Paint paint = new Paint();
    paint.setXfermode(new PorterDuffXfermode(Mode.CLEAR));

    Canvas canvas = new Canvas(bmOverlay); 
    canvas.drawBitmap(bmp2, 0, 0, null); 
    canvas.drawRect(30, 30, 100, 100, paint);

    return bmOverlay;
}

Answer 2

Just in case someone is trying to solve same problem, there is a better solution: Bitmap.createBitmap(Bitmap, int x, int y, int width, int height). For example, if you need to crop 10 pixels from each side of a bitmap then use this:

Bitmap croppedBitmap = Bitmap.createBitmap(originalBitmap, 10, 10, originalBitmap.getWidth() - 20, originalBitmap.getHeight() - 20);