android UI 布局

Question

上边的TextView是设置的水平居中，但是显示还是在左上角，怎么让它局中显示？

Answer 1

修改以下两个属性：
<TextView
 android:layout_width="match_parent"
 android:gravity="center_horizontal" />

Answer 2

clean一下，重新编译，运行一下

Answer 3

you should set orientation for LinearLayout,if you want to make TextView center horizontal,just setandroid:orientation="vertical" for LinearLayout is OK ~