背景选择器常见错误

1.button背景选择器必须加上形状:

<item android:state_pressed="true">
        <shape android:shape="rectangle">
            <solid android:color="#F39800"></solid>
        </shape>
    </item>

    <item android:state_pressed="false">
        <shape android:shape="rectangle">
            <solid android:color="#D7D7D7"></solid>
        </shape>
    </item>

2.不加形状,会报错的

<item android:state_pressed="true" android:color="#D7D7D7">
</item>

<item android:state_pressed="false" android:color="#97F765">
</item>