public void onViewClicked(View view) {        switch (view.getId()) {            case R.id.bt1:                img1.setColorFilter(getResources().getColor(R.color.color3));                break;            case R.id.bt2:                img1.setColorFilter(getResources().getColor(R.color.color1));                break;            case R.id.bt3:                img1.setColorFilter(getResources().getColor(R.color.color2));                break;        }    }