通过图片，获取颜色

mageView imageView = 
new
 ImageView(
this
);
imageView.setBackgroundResource(R.drawable.background);
final
 Bitmap bitmap = ((BitmapDrawable) imageView.getDrawable()).getBitmap();
int
 colorValue = bitmap.getPixel((
int
) event.getX(), (
int
) event.getY());
   @Override
    public
 
boolean
 onTouch(View v, MotionEvent event) {
        int
 colorValue = bitmap.getPixel((
int
) event.getX(), (
int
) event.getY());
        // red
        if
 (colorValue == 
0xff0000
) {
            // Something to do.

            return
 
true
;
        }
        // green
        if
 (colorValue == 
0x00ff00
) {
            // Something to do.

            return
 
true
;
        }
        // blue
        if
 (colorValue == 
0x0000ff
) {
            // Something to do.

            return
 
true
;
        }
        // transparent
        if
 (colorValue == 
0x000000
) {
            // Something to do.

            return
 
true
;
        }

        return
 
false
;
    }
});