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ImageButtonの背景を透明にしたときのクリック感を出す

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切り替え画像にこだわらないのであれば↓でサクッと。

class SimulateButtonClick implements OnTouchListener {
    @Override
    public boolean onTouch(View v, MotionEvent event) {
        if (event.getAction() == MotionEvent.ACTION_DOWN) {
            ((ImageView) v).setColorFilter(Color.argb(100, 0, 0, 0));
        } else if (event.getAction() == MotionEvent.ACTION_UP) {
            ((ImageView) v).setColorFilter(null);
        }
        return false;
    }
}
ImageButton.setOnTouchListener(new SimulateButtonClick());
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