Switch.java 文件源码

public void changeBackground() {
    if (iSchecked) {
        if (!isInEditMode()) {
            setBackgroundResource(R.drawable.background_checkbox);
            LayerDrawable layer = (LayerDrawable) getBackground();
            GradientDrawable shape = (GradientDrawable) layer
                    .findDrawableByLayerId(R.id.shape_bacground);
            shape.setColor(backgroundColor);
        }

    } else {
        if (!isInEditMode()) {
            setBackgroundResource(R.drawable.background_switch_ball_uncheck);
        }
    }
}