[Android UI 教學(3)] 建立簡單的對話盒

原程式請參考[Android UI 教學(2)] 建立有圖示功能表請修訂下列文字

package com.example.menu;

import android.app.Activity;

import android.app.AlertDialog;
import android.content.DialogInterface;

import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;

public class MenuDesignActivity extends Activity {
    /** Called when the activity is first created. */
 public static final int ADD_ID = Menu.FIRST ;
 public static final int DELETE_ID = Menu.FIRST + 1;
 public static final int ABOUT_ID = Menu.FIRST + 2;
 public static final int EXIT_ID = Menu.FIRST + 3;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
    }

 @Override
 public boolean onCreateOptionsMenu(Menu menu) {
  // TODO Auto-generated method stub
  
     menu.add(0, ADD_ID, 0, "Add").setIcon(R.drawable.icon);
     menu.add(0, DELETE_ID, 1, "Del");
     menu.add(0, ABOUT_ID, 2, "About");
     menu.add(0, EXIT_ID, 3, "Exit");

  return super.onCreateOptionsMenu(menu);
 }

 @Override
 public boolean onOptionsItemSelected(MenuItem item) {
  // TODO Auto-generated method stub
     switch(item.getItemId()){
     case ADD_ID:
      setTitle("新增項目");
      break;
     case DELETE_ID:
      setTitle("刪除項目");
      break;
     case ABOUT_ID:
      setTitle("關於");

      openAboutDialog();

      break;
     case EXIT_ID:
      finish();
      break;
     }

  return super.onOptionsItemSelected(item);
 }


    public void openAboutDialog()
    {
     new AlertDialog.Builder(this)
     .setTitle("關於")
     .setMessage("南開科大")
     //按下確認按鈕後的事件
     .setPositiveButton("ok", 
       new DialogInterface.OnClickListener()
     {
      public void onClick(DialogInterface dialoginterface, int i)
      {
      }
     }
     )
     .show();
    }
 
}