在drawable创建两个xml
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="oval">
<solid android:color="@android:color/black" />
<size
android:width="10dp"
android:height="10dp" />
</shape>
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="oval">
<solid android:color="@android:color/white"/>
<size
android:width="10dp"
android:height="10dp" />
</shape>
在drawable创建一个选择器
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_checked="true" android:drawable="@drawable/dot_normal"></item>
<item android:state_checked="false" android:drawable="@drawable/dot_normal"></item>
</selector>
给可控赋值
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/bu"
/>