android ListView内数据的动态添加与删除

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本例中使用的方法是重写了一个Adapter类，比较灵活

 

main.xml 文件：

<?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>

 

listview_item.xml文件：

<?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;  
        }  
    }  
}