（1）佈局檔案沒有做更改

（2）在res--menu目錄下的main.xml檔案中程式碼如下：

<menu xmlns:android="http://schemas.android.com/apk/res/android" >

    <!-- 一級選單 -->
    <item
        android:id="@+id/file"
        android:title="@string/file">

        <!-- 二級選單 -->
        <menu>
            <item
                android:id="@+id/create"
                android:title="@string/create">
            </item>
            <item
                android:id="@+id/open"
                android:title="@string/open">
            </item>
        </menu>
    </item>
    <!-- 一級選單 -->
    <item
        android:id="@+id/chioce"
        android:title="@string/chioce">

        <!-- 二級選單 -->
        <menu>
            <item
                android:id="@+id/create1"
                android:title="@string/create">
            </item>
            <item
                android:id="@+id/open1"
                android:title="@string/open">
            </item>
        </menu>
    </item>

</menu>
 

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

    <string name="app_name">Menu_submenu</string>
    <string name="action_settings">Settings</string>
    <string name="hello_world">Hello world!</string>
    <string name="file">檔案</string>
    <string name="create">新建</string>
    <string name="open">開啟</string>
    <string name="chioce">選項</string>

</resources>
 

package com.example.menu_submenu;

import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.view.Menu;
import android.view.MenuItem;
import android.view.SubMenu;
import android.widget.Toast;

public class MainActivity extends Activity {

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

	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		// Inflate the menu; this adds items to the action bar if it is present.
		getMenuInflater().inflate(R.menu.main, menu);
		return true;
	}

	/*
	 * 處理一級選單
	 */
	@Override
	public boolean onOptionsItemSelected(MenuItem item) {
		switch (item.getItemId()) {
		case R.id.file:
			Toast.makeText(MainActivity.this, "一級選單file..", Toast.LENGTH_SHORT)
					.show();
			break;
		case R.id.chioce:
			Toast.makeText(MainActivity.this, "一級選單chioce..",
					Toast.LENGTH_SHORT).show();
			break;

		default:
			break;
		}
		return super.onOptionsItemSelected(item);
	}

	/*
	 * 處理二級選單的
	 */
	@Override
	public boolean onMenuItemSelected(int featureId, MenuItem item) {
		switch (item.getItemId()) {
		case R.id.create1:
			Toast.makeText(MainActivity.this, "處理二級選單create1..",
					Toast.LENGTH_SHORT).show();
			break;
		case R.id.open1:
			Toast.makeText(MainActivity.this, "處理二級選單create1..",
					Toast.LENGTH_SHORT).show();
			break;
		case R.id.create:
			Toast.makeText(MainActivity.this, "處理二級選單create..",
					Toast.LENGTH_SHORT).show();
			break;
		case R.id.open:
			Toast.makeText(MainActivity.this, "處理二級選單open..",
					Toast.LENGTH_SHORT).show();
			break;

		default:
			break;
		}
		return super.onMenuItemSelected(featureId, item);
	}
}