1.android:clipChildren
Defines whether a child is limited to draw inside of its bounds or not. This is useful with animations that scale the size of the children to more than 100% for instance.
In such a case, this property should be set to false to allow the children to draw outside of their bounds. The default value of this property is true.
2.android:addStatesFromChildren
Sets whether this ViewGroup's drawable states also include its children's drawable states. This is used, for example, to make a group appear to be focused when its
child EditText or button is focused.
3.android:ellipsize
TextView及其子类，当字符内容太长显示不下时可以省略号代替未显示的字符