Binary XML file line #4: tag requires a 'drawable' attribute or child tag defining a drawable

在控件使用Selector出現了這個錯誤

Binary XML file line #4: <item> tag requires a 'drawable' attribute or child tag defining a drawable

Selector錯誤代碼

<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:color="@color/white" android:state_pressed="false"  />
    <item android:color="@color/gray_light" android:state_pressed="true"  />
</selector>

糾正——將android:color="" 改爲 android:drawable=""

<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:color="@color/white" android:state_pressed="false"  />
    <item android:color="@color/gray_light" android:state_pressed="true"  />
</selector>