Android programming Simple to achieve ImageView click on the background image modification method _android

The example of this article describes the Android programming simple implementation of ImageView click of the background image modification method. Share to everyone for your reference, specific as follows:

When using ImageView, when clicked, want the background image to be modified, so that the click effect is obvious. Here, a very simple method, at least a very clear way. Create an XML file under the Res/drawable folder. For example My.xml, the contents are as follows:

<?xml version= "1.0" encoding= "Utf-8"?> <selector xmlns:android=
"http://schemas.android.com/apk/res/" Android "> 
  <item android:state_pressed=" true "
    android:drawable=" @*android:drawable/btn_search_ Dialog_voice_pressed "/>
  <item android:state_pressed=" false "
    android:drawable=" @*android:drawable/ Btn_search_dialog_voice_default "/>
</selector>

Here to pay attention to a point, that is, in the above drawable is a reference to the system's picture resources, if the use of their own picture resources, to use the following format

Copy Code code as follows:

android:drawable= "@drawable/ic_desk_point_normal"

Then, in the XML file that defines the ImageView, set:

android:src= "@drawable/youpicture"
android:background= "@drawable/my"

The above can complete the effect.

Remember ImageView to add clickable= "true", otherwise its selector is not effective.

Save the following XML as an. xml file (such as List_item_bg.xml), and the runtime system uses the corresponding background image according to the status of the list items in the ListView.

Drawable/list_item_bg.xml

<?xml version= "1.0" encoding= "Utf-8"?> <selector xmlns:android=   
"http://schemas.android.com/apk/res/" Android > 
 <!--default background picture-->  
 <item android:drawable= "@drawable/pic1"/> 
 <!-- Background picture with no focus-->  
 <item android:state_window_focused= "false"  
    android:drawable= "@drawable/pic1"/>   
 < background picture-->  
 <item android:state_focused= "true" android:state_pressed= "true" when the focus is received in non-touch mode and clicked   
    android:drawable= "@drawable/pic2"/>  
 <!--touch mode when clicked background picture-->  
 <item android:state_focused = "false" android:state_pressed= "true"   
    android:drawable= "@drawable/pic3"/>   
 <!--picture background When selected-->  
 <item android:state_selected= "true"   
    android:drawable= "@drawable/pic4"/>   
 <!--the picture background when the focus is obtained -->  
 <item android:state_focused= "true"   
    android:drawable= "@drawable/pic5"/>   
</ Selector>

How to use:

The first is to configure in ListView

Copy Code code as follows:

Android:listselector= "@drawable/LIST_ITEM_BG"

The second is to add attributes to the ListView item

Copy Code code as follows:

android:background= "@drawable/LIST_ITEM_BG"

The third type is used in Java code:

drawable drawable = Getresources (). getdrawable (R.DRAWABLE.LIST_ITEM_BG);
Listview.setselector (drawable);

Note: The list is sometimes black, and the following code needs to be added to make it transparent:

Copy Code code as follows:

Android:cachecolorhint= "@android: Color/transparent"

I hope this article will help you with the Android program.