sheishuoAPP/uikit/res/drawable/nim_bg_edittext_rectangle.xml

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:drawable="@drawable/nim_bg_edittext_rectangle_normal" android:state_window_focused="false" />
    <item android:drawable="@drawable/nim_bg_edittext_rectangle_focused" android:state_focused="true" />
</selector>