tablayout在中间显示

<android.support.design.widget.TabLayout
    android:id="@+id/tabLayout"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 app:tabTextAppearance="@style/TabLayoutTextStyle"
 app:tabGravity="center"
 app:tabMode="fixed"
 app:tabTextColor="@color/c7"
 app:tabSelectedTextColor="@color/c8"/>

关键是这两行代码

 app:tabGravity="center"
 app:tabMode="fixed"