"Android" Android background selector selector Usage Summary

A. Create XML file, location:drawable/xxx.xml, in the same directory remember to put related pictures

<?XML version= "1.0" encoding= "Utf-8"?>   <selectorxmlns:android= "Http://schemas.android.com/apk/res/android"> <!--background picture by default -    <Itemandroid:drawable= "@drawable/pic1" />    <!--background picture When there is no focus -    <Itemandroid:state_window_focused= "false"android:drawable= "@drawable/pic1" />   <!--background picture When you get focus in non-touch mode and click -    <Itemandroid:state_focused= "true"android:state_pressed= "true"android:drawable= "@drawable/pic2" /> <!--background picture when clicked in touch mode -  <Itemandroid:state_focused= "false"android:state_pressed= "true"android:drawable= "@drawable/pic3" />  <!--picture Background When selected -    <Itemandroid:state_selected= "true"android:drawable= "@drawable/pic4" />   <!--picture background when getting focus -    <Itemandroid:state_focused= "true"android:drawable= "@drawable/pic5" />   </selector>

two . Use XML File:

1. Method One: in listview in configuration android:listselector = "@drawable/xxx
or in listview item Add Property android : background= "@drawable/xxx"

2. Method Two: drawable drawable = Getresources (). getdrawable (r.drawable. xxx);
Listview.setselector (drawable); However, this will appear when the list is sometimes black, need to add:android:cachecolorhint= "@android: Color/transparent" make it transparent.

Related properties:

android:state_selected is selected
Android:state_focused is gaining focus
Android:state_pressed is click
Android:state_enabled is the set response event , which refers to all events

The selector effect of the button can also be set according to these states . You can also set selector to change The state of text in a button.

Here is the configuration Button the text effect in:

Drawable/button_font.xml<?XML version= "1.0" encoding= "Utf-8"?><selectorxmlns:android= "Http://schemas.android.com/apk/res/android">    <Itemandroid:state_selected= "true"Android:color= "#FFF" />    <Itemandroid:state_focused= "true"Android:color= "#FFF" />    <Itemandroid:state_pressed= "true"Android:color= "#FFF" />    <ItemAndroid:color= "#000" /></selector>button can also achieve more complex effects, such as gradient drawable/button_color.xml<?XML version= "1.0" encoding= "Utf-8"?><selectorxmlns:android= "Http://schemas.android.com/apk/res/android">        / <Itemandroid:state_pressed= "true">//Defines the pattern when the button is in the pressed state. <Shape>                <GradientAndroid:startcolor= "#8600ff" />                       <StrokeAndroid:width= "2DP"Android:color= "#000000" />                        <CornersAndroid:radius= "5DP" />                         <paddingAndroid:left= "10DP"Android:top= "10DP"Android:bottom= "10DP"Android:right= "10DP"/>                   </Shape> </Item> <Itemandroid:state_focused= "true">//define the shape when the button gets focus<Shape>                        <GradientAndroid:startcolor= "#eac100"/>                         <StrokeAndroid:width= "2DP"Android:color= "#333333"Color= "#ffffff"/>                          <CornersAndroid:radius= "8DP" />                            <paddingAndroid:left= "10DP"Android:top= "10DP"Android:bottom= "10DP"Android:right= "10DP"/>                                   </Shape>  </Item></selector> 

Finally, you need to include  button xml file added two items. For example main.xml   files, required in < button/> riga two android : focusable= "true"  android:background= "@drawable/button_color"