動態刪除列表視圖(ListView)的內容

跟進前一文"動態添加列表視圖(ListView)的內容"的帖子, 新增刪除的功能.

創建列表視圖(ListView)的 OnItemClickListener(), 當用戶點擊列表視圖的一個項目, 然後打開一個對話框, 如果用戶點擊"OK", 此一項目將被刪除.



佈局文件(main.xml)無需修改, 參閱前文"動態添加列表視圖(ListView)的內容".

修改主要代碼 AndroidDynList.java, 添加 listViewOnItemClickListener.

package com.AndroidDynList;

import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListView;

public class AndroidDynList extends Activity {
 
 EditText input;
 Button add, clear;
 ListView listview;
 ArrayAdapter<String> MyArrayAdapter;
 
   /** Called when the activity is first created. */
   @Override
   public void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       setContentView(R.layout.main);
       input = (EditText)findViewById(R.id.input);
    add = (Button)findViewById(R.id.add);
    clear = (Button)findViewById(R.id.clear);
    listview = (ListView)findViewById(R.id.list);
    
    MyArrayAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1);
    listview.setAdapter(MyArrayAdapter);
    
    add.setOnClickListener(addOnClickListener);
    clear.setOnClickListener(clearOnClickListener);
    
    listview.setOnItemClickListener(listViewOnItemClickListener);
   }
  
   private Button.OnClickListener addOnClickListener
   = new Button.OnClickListener(){

  @Override
  public void onClick(View arg0) {
   // TODO Auto-generated method stub
   String newInput = input.getText().toString();
   MyArrayAdapter.add(newInput);
           MyArrayAdapter.notifyDataSetChanged();
  }};
  
 private Button.OnClickListener clearOnClickListener
 = new Button.OnClickListener(){

  @Override
  public void onClick(View arg0) {
   // TODO Auto-generated method stub
   MyArrayAdapter.clear();
            MyArrayAdapter.notifyDataSetChanged();
  }};
  
 private ListView.OnItemClickListener listViewOnItemClickListener
 = new ListView.OnItemClickListener(){

  @Override
  public void onItemClick(AdapterView<?> parent, View view, int position,
    long id) {
   // TODO Auto-generated method stub
   final String strSelectedItem = parent.getItemAtPosition(position).toString();
   
   AlertDialog.Builder delAlertDialog = new AlertDialog.Builder(AndroidDynList.this);
   delAlertDialog.setTitle("- DELETE Selected Item? -");
   delAlertDialog.setMessage(strSelectedItem);
   delAlertDialog.setPositiveButton("OK", new DialogInterface.OnClickListener() {
           
               // do something when the button is clicked
               public void onClick(DialogInterface arg0, int arg1) {
                MyArrayAdapter.remove(strSelectedItem);
                   MyArrayAdapter.notifyDataSetChanged();
               }
           });
        delAlertDialog.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
         
               // do something when the button is clicked
               public void onClick(DialogInterface arg0, int arg1) {
                   //...
               }
           });
        delAlertDialog.show();
  }};
}

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