FloatingActionButton.java 文件源码

/**
 * @param circleRect the defined rectangle
 * @return StateListDrawable
 */
protected StateListDrawable createFillDrawable(RectF circleRect) {
    StateListDrawable drawable = new StateListDrawable();
    drawable.addState(new int[]{android.R.attr.state_pressed}, createCircleDrawable(circleRect, mColorPressed));
    drawable.addState(new int[]{}, createCircleDrawable(circleRect, mColorNormal));
    return drawable;
}