RippleCompat.java 文件源码

@TargetApi(Build.VERSION_CODES.M)
@Override
public Drawable initBackgroundDrawable(View view, Drawable mBackgroundColorDrawable) {

    RippleDrawable mBackgroundRippleDrawable = new RippleDrawable(
            ColorStateList.valueOf(Color.TRANSPARENT),
            null,
            new ShapeDrawable(new RectShape())
    );

    view.setBackground(mBackgroundColorDrawable);
    view.setForeground(mBackgroundRippleDrawable);

    return mBackgroundRippleDrawable;

}