Android中未生成的菜单

Question

这是我的代码我试图实现一个简单的菜单onClick。菜单按钮没有响应。你能帮我解决错误吗？

package com.test; 

import android.app.Activity; 
import android.app.AlertDialog; 
import android.content.DialogInterface; 
import android.content.Intent; 
import android.os.Bundle; 
import android.view.Menu; 
import android.view.MenuInflater; 
import android.view.MenuItem; 
import android.view.View; 
import android.view.Window; 
import android.widget.ImageView; 
import android.widget.TextView; 

public class menuitem extends Activity { 
    @Override 
    public boolean onCreateOptionsMenu(Menu menu) { 
     MenuInflater inflater = getMenuInflater(); 
     inflater.inflate(R.menu.menuitem, menu); 
     return true; 

    }  

     public boolean onOptionsItemSelected(MenuItem item) { 
      // Handle item selection 
      switch (item.getItemId()) { 
      case R.id.About: 
       About(); 
       return true; 
      case R.id.Exit: 
       Exit(); 
       return true; 
      default: 
       return super.onOptionsItemSelected(item); 
      } 
     }  




    private void Exit() { 
     // TODO Auto-generated method stub 
     finish(); 
    } 

    private void About() { 
     // TODO Auto-generated method stub 
     AlertDialog.Builder builder = new AlertDialog.Builder(this); 
     builder.setMessage("APPLICATION VERSION-- 1.6") 
       .setCancelable(false) 
       .setPositiveButton("Ok", new DialogInterface.OnClickListener() { 
        public void onClick(DialogInterface dialog, int id) { 
         dialog.cancel(); 
        } 
       }); 

     AlertDialog alert = builder.create(); 
    } 
} 

Answer 1

你只创建对话框....你需要调用show（），以显示它..