android selector 的<item/>不能是空节点

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">

<item android:state_pressed="true"><shape android:shape="rectangle">
<solid android:color="@color/grey_light" />

<stroke android:width="1dp" android:color="#00000000" />
</shape></item>

</selector>

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">

<item android:state_pressed="true"><shape android:shape="rectangle">
<solid android:color="@color/grey_light" />

<stroke android:width="1dp" android:color="#00000000" />
</shape></item>
<item android:state_pressed="false"></item>
</selector>