Introduction to Android Development (12) List Control 12.3 ListView Summary Example

Use an example to summarize the basic use of ListView.

1. A new project: Listviewdemo.

2. Code in the Main.xml.

<?xml version= "1.0" encoding= "Utf-8"?> <linearlayout xmlns:android=    
"http://schemas.android.com/apk/" Res/android " 
    android:layout_width=" fill_parent " 
    android:layout_height=" fill_parent " 
    android:o" rientation= "vertical" >    
           
<button android:id= " 
    @+id/btn" android:layout_width= "Fill_parent" android:layout_height= "Wrap_content" 
    android:text= "Show selected items"  
    android:onclick= "OnClick"/>    
       
<listview  
    android:id= "@+id/android:list" 
    android:layout_width= "Wrap_content" 
    android: layout_height= "Wrap_content"/>    
       
</LinearLayout>

3. Code in the Strings.xml.

<?xml version= "1.0" encoding= "Utf-8"?>    
<resources>    
    <string name= "Hello" >hello world, basicviews5activity!</string>    
    <string name= "app_name" >BasicViews5</string>    
    < String-array name= "Presidents_array" >    
        <item>dwight D. eisenhower</item>    
        <item>john F. Kennedy</item>    
        <item>lyndon B. johnson</item>    
        <item>richard Nixon</item>    
        <item>gerald ford</item>    
        <item>jimmy carter</item>    
        <item>ronald Reagan</item>    
        <item>george H. bush</item>    
        <item>bill clinton</item>    
        <item>george W. bush</item>    
        <item>barack obama</item>    
    </string-array >            
</resources>

4. Code in the Listviewdemo.

public class Listviewdemo extends Listactivity {string[] presidents; /** called the activity is a.            
               
        * * @Override public void onCreate (Bundle savedinstancestate) {super.oncreate (savedinstancestate);    
       
        Setcontentview (R.layout.main);    
                               
        ListView Lstview = Getlistview ();     
        Lstview.setchoicemode (Listview.choice_mode_none);     
        Lstview.setchoicemode (Listview.choice_mode_single);            
        Lstview.setchoicemode (listview.choice_mode_multiple);    
       
        Lstview.settextfilterenabled (TRUE);    
       
        Presidents = Getresources (). Getstringarray (R.array.presidents_array); Setlistadapter New Arrayadapter<string> (this, Android.    
    R.layout.simple_list_item_checked, Presidents)); } public void Onlistitemclick (    
    ListView Parent, View v, int position, long id) {Toast.maketext (this, "H    
    Ave selected "+ presidents[position], toast.length_short). Show (); }//For button click event public void OnClick (view view) {ListView Lstview = ge    
               
        TListView ();    
        String itemsselected = "Selected items: \ n"; for (int i=0; I<lstview.getcount (); i++) {if (lstview.isitemchecked (i)) {Itemssel    
            ected + + + lstview.getitematposition (i) + "\ n";    
    } toast.maketext (this, itemsselected, Toast.length_long). Show (); }    
       
}

5. Press F11 to debug on the simulator. Select objects in the ListView and click the button above to show which objects are selected.

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