Android Control selector Selector

Take button as an example:

General Button has 2 states, pressed and normal state

1. Create a new drawable folder under Res to store your own drawable files

2. Create a new pressed and normal shape file under the Drawable folder (which is a picture resource, skip this step)

3. New Button Background Selector file

4. Specify drawable for the backgroud of the button

Code:

Button_noraml.xml

<?xml version= "1.0" encoding= "Utf-8"?>
<shape xmlns:android= "Http://schemas.android.com/apk/res/android" >

<stroke
Android:width= "1DP"
Android:color= "#00FF00"/>

<gradient
Android:angle= "270"
Android:endcolor= "#e5e5e5"
Android:startcolor= "#DCDCDC"/>

</shape>

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Button_press.xml

<?xml version= "1.0" encoding= "Utf-8"?>
<shape xmlns:android= "Http://schemas.android.com/apk/res/android" >

<!--strokes--
<stroke
Android:width= "1DP"
Android:color= "#00FF00"/>
<!--gradients--
<gradient
Android:angle= "270"
Android:endcolor= "#00FF00"
Android:startcolor= "#90EE90"/>

</shape>

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Button_selector.xml

<?xml version= "1.0" encoding= "Utf-8"?>
<selector xmlns:android= "Http://schemas.android.com/apk/res/android" >

<!--pressed state drawable--
<item android:drawable= "@drawable/button_press" android:state_pressed= "true" ></item>
<!--normal state of drawable---
<item android:drawable= "@drawable/button_noraml" ></item>

</selector>

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<?xml version= "1.0" encoding= "Utf-8"?
<linearlayout xmlns:android= "http://schemas.android.com/apk /res/android "
    android:layout_width=" match_parent "
    android:layout_ height= "Match_parent"
    android:orientation= "vertical";

    < Button
        android:layout_width= "match_parent"
         android:layout_height= "Wrap_content"
        Android:layout_margin= "30DP"
        android:background= "@drawable/button_selector"
        android:text= "button"/>

</LINEARLAYOUT>