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我为我的按钮创建了 2 种不同的状态，并且为此购买创建了选择器： 

<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:state_focused="true" android:state_pressed="false" android:drawable="@drawable/level1_calm" />
    <item android:state_focused="true" android:state_pressed="true" android:drawable="@drawable/level1_on_click" />
    <item android:state_focused="false" android:state_pressed="true" android:drawable="@drawable/level1_on_click" />
    <item android:drawable="@drawable/level1_calm" />
</selector>

但是我怎样才能对所有按钮只使用一个选择器，或者它是被禁止的。
我的意思是我可以在这里使用一些变量，如下所示：

<?xml version="1.0" encoding="utf-8"?>

<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:state_focused="true" android:state_pressed="false" android:drawable="@drawable/level`$Number_button`_calm" />
    <item android:state_focused="true" android:state_pressed="true" android:drawable="@drawable/level`$Number_button`_on_click" />
    <item android:state_focused="false" android:state_pressed="true" android:drawable="@drawable/level`$Number_button`_on_click" />
    <item android:drawable="@drawable/level`$Number_button`_calm" />
</selector>
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