Exemple de code pour l'ajout et la suppression dynamiques de données dans Android ListView

Fichier 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:orientation="horizontal"  
     > 
     <LinearLayout 
       android:layout_width="fill_parent" 
      android:layout_height="fill_parent"    
      android:orientation="vertical" 
      > 
     <ListView  
      android:id="@+id/listview"     
      android:layout_width="fill_parent" 
      android:layout_height="wrap_content" 
     /> 
     <Button  
      android:id="@+id/add"     
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content"  
      android:text="添加" 
      /> 
     </LinearLayout> 
 </LinearLayout>

Fichier listview_item.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="wrap_content" 
     android:orientation="horizontal" 
     android:background="#000000" 
     android:padding="20dp" 
     > 
        
     <EditText 
     android:id="@+id/edit" 
     android:layout_width="200dp" 
     android:layout_height="wrap_content" 
     /> 
     <Button 
     android:id="@+id/del" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content"    
     android:text="删除" 
     /> 
        
 </LinearLayout>

MainActivity.java

 package com.yyy.testandroid; 
     
import java.util.ArrayList;  
    
import android.app.Activity; 
import android.content.Context; 
import android.os.Bundle; 
import android.view.LayoutInflater; 
import android.view.View; 
import android.view.View.OnClickListener; 
import android.view.View.OnFocusChangeListener; 
import android.view.ViewGroup; 
 import android.widget.BaseAdapter; 
 import android.widget.Button; 
 import android.widget.EditText; 
 import android.widget.ListView; 
 import android.widget.TextView; 
    
 public class TestAndroidActivity extends Activity { 
     /** Called when the activity is first created. */ 
        
     private Button button,add; 
     private TextView text; 
     private ListView listview; 
     public MyAdapter adapter; 
     @Override 
     public void onCreate(Bundle savedInstanceState) { 
         super.onCreate(savedInstanceState); 
         setContentView(R.layout.main); 
         listview = (ListView) findViewById(R.id.listview); 
         add = (Button) findViewById(R.id.add); 
         adapter = new MyAdapter(this); 
         listview.setAdapter(adapter); 
            
         add.setOnClickListener(new OnClickListener() { 
             @Override 
             public void onClick(View arg0) { 
                 // TODO Auto-generated method stub 
                 adapter.arr.add(""); 
                 adapter.notifyDataSetChanged(); 
             } 
         }); 
     }  
 
     private class MyAdapter extends BaseAdapter { 
    
         private Context context; 
         private LayoutInflater inflater; 
         public ArrayList<String> arr; 
         public MyAdapter(Context context) { 
             super(); 
             this.context = context; 
             inflater = LayoutInflater.from(context); 
             arr = new ArrayList<String>(); 
             for(int i=0;i<3;i++){    //listview初始化3个子项 
                 arr.add(""); 
             } 
         } 
         @Override 
         public int getCount() { 
             // TODO Auto-generated method stub 
             return arr.size(); 
         } 
         @Override 
         public Object getItem(int arg0) { 
             // TODO Auto-generated method stub 
             return arg0; 
         } 
         @Override 
         public long getItemId(int arg0) { 
             // TODO Auto-generated method stub 
             return arg0; 
         } 
         @Override 
         public View getView(final int position, View view, ViewGroup arg2) { 
             // TODO Auto-generated method stub 
             if(view == null){ 
                 view = inflater.inflate(R.layout.list_item, null); 
             } 
             final EditText edit = (EditText) view.findViewById(R.id.edit); 
             edit.setText(arr.get(position));    //在重构adapter的时候不至于数据错乱 
             Button del = (Button) view.findViewById(R.id.del); 
             edit.setOnFocusChangeListener(new OnFocusChangeListener() { 
                 @Override 
                 public void onFocusChange(View v, boolean hasFocus) { 
                     // TODO Auto-generated method stub 
                     if(arr.size()>0){ 
                         arr.set(position, edit.getText().toString()); 
                     } 
                 } 
             }); 
             del.setOnClickListener(new OnClickListener() { 
                 @Override 
                 public void onClick(View arg0) { 
                     // TODO Auto-generated method stub 
                     //从集合中删除所删除项的EditText的内容 
                     arr.remove(position); 
                     adapter.notifyDataSetChanged(); 
                 } 
             }); 
             return view; 
         } 
     } 
 }

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