Update the data in the Adapter and notify the ListView to display

Click the button on the interface to call the notifyDatasetChanged() method of the Adapter to notify the ListView to update the display.
Example:

         Java code   
         
       
package  com.laili.apater;  
  
import java.util.ArrayList;   
import android.app.Activity;  
import android.os.Bundle;  
import android.view.View;  
import android.widget.ArrayAdapter;  
import android.widget.Button;  
import android.widget.ListView;  
  
public class ListAdapterActivity extends Activity {  
     
    private ListView list;  
    private ArrayAdapter<String> adapter;  
    private ArrayList<String> data;  
    private Button addBtn;  
    private int i = 0;  
    @Override  
    public void onCreate(Bundle savedInstanceState) {  
        super .onCreate (savedInstanceState);  
        setContentView(R.layout.main);  
          
        list = (ListView) findViewById(R.id.list);  
        data = new ArrayList<String>();  
        for (i = 0; i < 5; i++) {  
            data.add(new String("" + (i + 1)));  
        }  
          
        adapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, data);  
        list.setAdapter(adapter);  
          
          
        addBtn = (Button) findViewById(R.id.add);  
        addBtn.setOnClickListener(new View.OnClickListener() {  
              
            @Override  
            public void onClick(View v) {  
                System.out.println(i);  
                data.add(new String("" + (++i)));  
                System.out.println(i);  
                adapter.notifyDataSetChanged();  
            }  
        });  
          
    }  
}  

layout:

         Java code   
         
       
<?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:orientation="vertical" >  
  
    <TextView  
        android:layout_width="fill_parent"  
        android:layout_height="wrap_content"  
        android:text="@string/hello" />  
    <ListView   
        android:id="@+id/list"  
        android:layout_width="fill_parent"  
        android:layout_height="wrap_content"  
        android:layout_weight="1"/>  
    <Button   
        android:id="@+id/add"  
        android:layout_width="fill_parent"  
        android:layout_height="wrap_content"  
        android:text="添加"/>  
</LinearLayout>  

display effect:

View image attachment

Update the data in the Adapter and notify the ListView to display

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