Question

I would like my Button to draw with a transparent background by default, to draw with a dark blue background when pressed, and to draw with a light blue background when selected. I set the Button’s background to the below selector, and am calling Button.setSelected(!Button.isSelected()) when the button is clicked. The pressed state works properly, but the Button draws with a transparent background when selected.

<selector xmlns:android="http://schemas.android.com/apk/res/android">
  <item android:state_window_focused="false" android:state_enabled="true" android:drawable="@drawable/tranpsshape" /> 
  <item android:state_window_focused="false" android:state_enabled="false" android:drawable="@drawable/tranpsshape" /> 
  <item android:state_pressed="true" android:drawable="@drawable/pressedbuttonshape" /> 
  <item android:state_focused="true" android:state_enabled="true" android:drawable="@drawable/selectedshape" /> 
  <item android:state_enabled="true" android:drawable="@drawable/tranpsshape" /> 
  <item android:state_focused="true" android:drawable="@drawable/tranpsshape" /> 
  <item android:state_selected="true" android:drawable="@drawable/selectedshape" /> 
  <item android:drawable="@drawable/tranpsshape" /> 
</selector>

selectedshape.xml

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android" >
    <solid android:color="#A3DAF2"/>
</shape>

pressedbuttonshape.xml

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android" >
    <solid android:color="#4ABDE8/>
</shape>

tranpsshape.xml

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android" >
    <solid android:color="#00000000"/>

</shape>

Answer 1

Accordind to documentation

During each state change, the state list is traversed top to bottom and the first item that matches the current state will be used—the selection is not based on the “best match,” but simply the first item that meets the minimum criteria of the state.

So you need to place state_selected above state_focused. So your file will look like this

<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:state_window_focused="false" android:state_enabled="true" android:drawable="@drawable/tranpsshape" /> 
    <item android:state_window_focused="false" android:state_enabled="false" android:drawable="@drawable/tranpsshape" /> 
    <item android:state_pressed="true" android:drawable="@drawable/pressedbuttonshape" /> 
    <item android:state_selected="true" android:drawable="@drawable/selectedshape" />         
    <item android:state_focused="true" android:state_enabled="true" android:drawable="@drawable/selectedshape" /> 
    <item android:state_enabled="true" android:drawable="@drawable/tranpsshape" /> 
    <item android:state_focused="true" android:drawable="@drawable/tranpsshape" /> 
    <item android:drawable="@drawable/tranpsshape" /> 
</selector>