在 XML中使用drawable和(Use drawable and in XML)

 是否可以使用带有drawable和<shape>属性的XML-Background资源？ 
 
 所以我有这个按钮 
 
        <Button
            android:layout_marginRight="5dp"
            android:id="@+id/send_button"
            android:layout_width="40dp"
            android:layout_height="40dp"
            android:background="@drawable/send_button" />
 
 其中有一个后台send_button.xml： 
 
<selector xmlns:android="http://schemas.android.com/apk/res/android">

    <item android:drawable="@drawable/ic_send_white_48dp" android:state_focused="true"/>
    <item android:drawable="@drawable/ic_send_white_48dp" android:state_pressed="true"/>
    <item android:drawable="@drawable/ic_send_black_48dp"/>

</selector>
 
 这个现在工作正常。 但我还想在可绘制和圆角后面添加背景颜色，如下所示： 
 
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle" >

    <corners android:radius="4dp" />

    <gradient
        android:angle="270"
        android:endColor="#88b823"
        android:startColor="#b0dc54" />

</shape>
 
 那么可以将这两个XML资源组合起来吗？ 到目前为止我尝试过，只显示drawable而不是形状： 
 
<selector xmlns:android="http://schemas.android.com/apk/res/android">

    <item android:drawable="@drawable/ic_send_white_48dp" android:state_focused="true"/>
    <item android:drawable="@drawable/ic_send_white_48dp" android:state_pressed="true"/>
    <item android:drawable="@drawable/ic_send_black_48dp">
        <shape xmlns:android="http://schemas.android.com/apk/res/android" android:shape="rectangle">
            <corners android:radius="4dp" />

            <gradient android:angle="270" 
                android:endColor="#88b823" 
                android:startColor="#b0dc54" />
        </shape>
    </item>

</selector>

Is it possible to use a XML-Background ressource with an drawable and a <shape> attribute?
 
So I have this button
 
        <Button
            android:layout_marginRight="5dp"
            android:id="@+id/send_button"
            android:layout_width="40dp"
            android:layout_height="40dp"
            android:background="@drawable/send_button" />
 
Which has a background send_button.xml:
 
<selector xmlns:android="http://schemas.android.com/apk/res/android">

    <item android:drawable="@drawable/ic_send_white_48dp" android:state_focused="true"/>
    <item android:drawable="@drawable/ic_send_white_48dp" android:state_pressed="true"/>
    <item android:drawable="@drawable/ic_send_black_48dp"/>

</selector>
 
This works fine right now. But I also want to add a background-color behind the drawable and rounded corners like this:
 
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle" >

    <corners android:radius="4dp" />

    <gradient
        android:angle="270"
        android:endColor="#88b823"
        android:startColor="#b0dc54" />

</shape>
 
So is it possible to combine these two XML ressources? What I've tried so far, just displays the drawable and not the shape:
 
<selector xmlns:android="http://schemas.android.com/apk/res/android">

    <item android:drawable="@drawable/ic_send_white_48dp" android:state_focused="true"/>
    <item android:drawable="@drawable/ic_send_white_48dp" android:state_pressed="true"/>
    <item android:drawable="@drawable/ic_send_black_48dp">
        <shape xmlns:android="http://schemas.android.com/apk/res/android" android:shape="rectangle">
            <corners android:radius="4dp" />

            <gradient android:angle="270" 
                android:endColor="#88b823" 
                android:startColor="#b0dc54" />
        </shape>
    </item>

</selector>

原文：https://stackoverflow.com/questions/33479692