Label.java 文件源码

@TargetApi(Build.VERSION_CODES.LOLLIPOP)
private Drawable createFillDrawable() {
    StateListDrawable drawable = new StateListDrawable();
    drawable.addState(new int[] {android.R.attr.state_pressed},
            createRectDrawable(mColorPressed)
    );
    drawable.addState(new int[] {}, createRectDrawable(mColorNormal));

    if(Util.hasLollipop() && mUsingRipple) {
        RippleDrawable ripple = new RippleDrawable(new ColorStateList(new int[][] {{}},
                new int[] {mColorRipple}
        ), drawable, null);
        setOutlineProvider(new ViewOutlineProvider() {
            @Override
            public void getOutline(View view, Outline outline) {
                outline.setOval(0, 0, view.getWidth(), view.getHeight());
            }
        });
        setClipToOutline(true);
        mBackgroundDrawable = ripple;
        return ripple;
    }

    mBackgroundDrawable = drawable;
    return drawable;
}