最佳答案
当选择 'tab_selected.xml' 时
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item>
<shape
android:shape="ring"
android:useLevel="false"
android:thickness="4dp"
android:innerRadius="0dp">
<solid android:color="#000"/>
</shape>
</item>
</selector>
未选中时 'tab_unselected'
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item>
<shape
android:shape="ring"
android:useLevel="false"
android:thickness="4dp"
android:innerRadius="0dp">
<solid android:color="#3b000000"/>
</shape>
</item>
</selector>
现在当 state_presses 为真或不是 'tab' 时
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:drawable="@drawable/tab_selected"
android:state_selected="true"/>
<item android:drawable="@drawable/tab_unseleted"/>
</selector>
现在在tablayout中
<android.support.design.widget.TabLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/tablayout"
android:layout_alignParentBottom="true"
app:tabIndicatorHeight="0dp"
app:tabGravity="center"
app:tabBackground="@drawable/tab"/>
关于android - 如何沿 Viewpager 显示圆形标签指示器?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/45255780/