Tint / dim drawable on touch

Question

The app I\'m currently working on uses a lot of ImageViews as buttons. The graphics on these buttons use the alpha channel to fade out the edges of the button and make them look

Answer 1

I too have irregular looking buttons and needed the tint. In the end, I just resorted to having a state colorlist as my ImageButton background. Gives the impression that the button color is changing on press and is very straightforward and less compute intensive. I know that this isn't exactly a tint, but it does give it does give necessary visual feedback to the user in what usually is a fleeting moment.

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android" >
    <item
        android:state_pressed="true"
        android:drawable="@android:color/darker_gray" />
    <item android:drawable="@android:color/transparent" />
</selector>

Answer 2

Your answer was also excellent ;)

I am modifying little bit, it will give you result like this:

Rect rect;
Drawable background;
boolean hasTouchEventCompleted = false;

@Override
public boolean onTouch(View v, MotionEvent event) {
    if (event.getAction() == MotionEvent.ACTION_DOWN) {
        rect = new Rect(v.getLeft(), v.getTop(), v.getRight(),
                v.getBottom());
        hasTouchEventCompleted = false;
        background = v.getBackground();
        background.setColorFilter(0x99c7c7c7,
                android.graphics.PorterDuff.Mode.MULTIPLY);
        v.setBackgroundDrawable(background);
    } else if (event.getAction() == MotionEvent.ACTION_UP
            && !hasTouchEventCompleted) {
        background.setColorFilter(null);
        v.setBackgroundDrawable(background);

    } else if (event.getAction() == MotionEvent.ACTION_MOVE) {
        if (!rect.contains(v.getLeft() + (int) event.getX(), v.getTop()
                + (int) event.getY())) {
            // User moved outside bounds
            background.setColorFilter(null);
            v.setBackgroundDrawable(background);
            hasTouchEventCompleted = true;
        }
    }


    //Must return false, otherwise you need to handle Click events yourself.  
    return false;
}