android MenuInflater 用XML文件布局

package my.com.testmenu;

import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;

public class TestmenuActivity extends Activity {
    private MenuInflater mi;
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        mi = new MenuInflater(this);
    }
    //创建菜单 
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // TODO Auto-generated method stub
        mi.inflate(R.menu.test_menu, menu);
        return super.onCreateOptionsMenu(menu);
    }
    //选择菜单Item
    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // TODO Auto-generated method stub
        switch (item.getItemId()) {
        case R.id.about:
            aboutAlert("本实例演示的是如何使用XML菜单资源来定义菜单！");
            break;
        case R.id.exit:
            exitAlert("真的要退出吗？");
            break;
        }
        return super.onOptionsItemSelected(item);
    }
    // 显示对话框
        private void exitAlert(String msg){
            AlertDialog.Builder builder = new AlertDialog.Builder(this);
            builder.setMessage(msg)
                   .setCancelable(false)
                   .setPositiveButton("确定", new DialogInterface.OnClickListener() {
                       public void onClick(DialogInterface dialog, int id) {
                           finish();
                       }
                   }).setNegativeButton("取消", new DialogInterface.OnClickListener() {
                       public void onClick(DialogInterface dialog, int id) {
                           return;
                       }
                   });
            AlertDialog alert = builder.create();
            alert.show();
        }
        
        // 显示对话框
        private void aboutAlert(String msg){
            AlertDialog.Builder builder = new AlertDialog.Builder(this);
            builder.setMessage(msg)
                   .setCancelable(false)
                   .setPositiveButton("确定", new DialogInterface.OnClickListener() {
                       public void onClick(DialogInterface dialog, int id) {
                       }
                   });
            AlertDialog alert = builder.create();
            alert.show();
        }

}

TestmenuActivity.java

test_Menu.xml

<?xml version="1.0" encoding="utf-8"?>

<menu xmlns:android="http://schemas.android.com/apk/res/android">
    <item 
        android:title="File"
        android:icon="@drawable/file">
        <menu>
            <group 
                android:id="@+id/noncheckable_group"
                android:checkableBehavior="none">
                
                <item 
                android:id="@+id/newFile"
                android:title="New" 
                android:alphabeticShortcut="n"/>
                
                <item 
                android:id="@+id/openFile"
                  android:title="Open" 
                  android:alphabeticShortcut="o"/>
                  
                <item 
                android:id="@+id/saveFile"
                android:title="Save" 
                android:alphabeticShortcut="s"/>
            </group>
        </menu>
    </item>

    <item android:title="Edit" android:icon="@drawable/edit">
        <menu>
            <group android:id="@+id/edit_group"
                    android:checkableBehavior="single">
                    
                <item android:id="@+id/cut"
                      android:title="Cut" />
                      
                <item android:id="@+id/copy"
                      android:title="Copy"/>
                      
                <item android:id="@+id/past"
                      android:title="Past"/>
            </group>
        </menu>
    </item>

    <item android:title="Help" android:icon="@drawable/help">
        <menu>
            <group android:id="@+id/help_group">
                <item android:id="@+id/about"
                        android:title="About" />
                <item android:id="@+id/exit"
                        android:title="Exit" />
            </group>
        </menu>
    </item>
    
</menu>