Android 圆图，正方形图等各种样式的xml的定义

<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="oval">
<solid android:color="#94C5FF" />
<size
android:width="20dp"
android:height="20dp" />
</shape>

android:shape="oval"

android:shape="rectangle"