参考:http://stackoverflow.com/questions/25044085/when-drawing-outside-the-view-clip-bounds-with-android-how-do-i-prevent-underli 对父view设置:android:clipChildren="false"
参考:http://stackoverflow.com/questions/25044085/when-drawing-outside-the-view-clip-bounds-with-android-how-do-i-prevent-underli
对父view设置:android:clipChildren="false"