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

You can combine StateListDrawable and LayerDrawable for this.

public Drawable getDimmedDrawable(Drawable drawable) {
        Resources resources = getContext().getResources();
        StateListDrawable stateListDrawable = new StateListDrawable();
        LayerDrawable layerDrawable = new LayerDrawable(new Drawable[]{
                drawable,
                new ColorDrawable(resources.getColor(R.color.translucent_black))
        });
        stateListDrawable.addState(new int[]{android.R.attr.state_pressed}, layerDrawable);
        stateListDrawable.addState(new int[]{android.R.attr.state_focused}, layerDrawable);
        stateListDrawable.addState(new int[]{android.R.attr.state_selected}, layerDrawable);
        stateListDrawable.addState(new int[]{}, drawable);
        return stateListDrawable;
}

I assume our colors.xml looks like this

    #80000000