Android-TQC105 MENU功能選單

學習重點:
(1)利用menu按鈕，改變setTitle

---

package COM.TQC.GDD01;

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 GDD01 extends Activity {
 
 // ...
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
    }
    protected static final int MENU_ADD=Menu.FIRST;
    protected static final int MENU_DEL=Menu.FIRST+1;
    protected static final int MENU_ABOUT=Menu.FIRST+2;
    protected static final int MENU_Quit=Menu.FIRST+3;
        
    
    @Override
    //建立menu選單的項目
    public boolean onCreateOptionsMenu(Menu menu){
     super.onCreateOptionsMenu(menu);
     //新增menu選單，再利用onOptionsItemSelected擷取選單選擇項目，處理相對應的事件
     menu.add(0,MENU_ADD,0,getString(R.string.menu_add));
     menu.add(0,MENU_DEL,0,getString(R.string.menu_delete));
     menu.add(0,MENU_ABOUT,0,getString(R.string.menu_about));
     menu.add(0,MENU_Quit,0,getString(R.string.menu_exit));
          
     return true ; 
    }
    //menu被選擇執行後的事件處理
    public boolean onOptionsItemSelected(MenuItem item){
     //點選menu，出現四個選擇，以switch區分點選何項，設定title並繫結至其功能
     switch(item.getItemId()){
     
     case MENU_ADD:
      setTitleAdd();
     break;
     
     case MENU_DEL:
      setTitleDEL();
     break;
          
     case MENU_ABOUT:
      openAboutDialog();
     break;
     
     case MENU_Quit:
      openExitDialog();
     break;
     
     
     }
     return super.onOptionsItemSelected(item) ;
    }
    
    
    
    
    private void setTitleAdd() {
  // TODO Auto-generated method stub
  setTitle(getString(R.string.menu_add));
 }
 private void setTitleDEL() {
  // TODO Auto-generated method stub
  setTitle(getString(R.string.menu_delete));
 }
 //點選「關於」功能
    public void openAboutDialog()
    {     
     setTitle(getString(R.string.menu_about));
     AlertDialog.Builder dialog=new AlertDialog.Builder(this);
     dialog.setTitle(R.string.menu_add); //新增項目
     dialog.setMessage(R.string.menu_about_msg); //TQC+ Android認證題庫
     dialog.setPositiveButton(R.string.str_ok,new DialogInterface.OnClickListener()
     {      //確認 
   @Override
   public void onClick(DialogInterface arg0, int arg1) {
    // TODO Auto-generated method stub
    
   }
  });
       dialog.show();
       
    }
    //點選「離開」功能
    public void openExitDialog()
    {
        //開啟視窗詢問【是否確認離開系統？】，於訊息視窗點選「確認」後，關閉程式
     //於訊息視窗點選「取消」，則關閉此詢問視窗，則回到MENU功能選單畫面
     AlertDialog.Builder dialog = new AlertDialog.Builder(this);
     dialog.setTitle(R.string.menu_exit);//離開
     dialog.setMessage(R.string.menu_exit_msg); //是否確認離開系統
     dialog.setPositiveButton(R.string.str_ok,new DialogInterface.OnClickListener(){
           //確認     
   @Override
   public void onClick(DialogInterface arg0, int arg1) {
    // TODO Auto-generated method stub
    finish();
   }
      
     });
     dialog.setNegativeButton(R.string.str_cancel, new DialogInterface.OnClickListener() {
        //取消
   @Override
   public void onClick(DialogInterface arg0, int arg1) {
    // TODO Auto-generated method stub
     //dialog.dismiss();
   }
  });
      dialog.show();
       }
}