Android学习笔记之Menu一级菜单、二级菜单的使用

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（1）布局文件没有做更改

（2）在res--menu目录下的main.xml文件中代码如下：

<menu xmlns:android="http://schemas.android.com/apk/res/android" >    <!-- 一级菜单 -->    <item        android:id="@+id/file"        android:title="@string/file">        <!-- 二级菜单 -->        <menu>            <item                android:id="@+id/create"                android:title="@string/create">            </item>            <item                android:id="@+id/open"                android:title="@string/open">            </item>        </menu>    </item>    <!-- 一级菜单 -->    <item        android:id="@+id/chioce"        android:title="@string/chioce">        <!-- 二级菜单 -->        <menu>            <item                android:id="@+id/create1"                android:title="@string/create">            </item>            <item                android:id="@+id/open1"                android:title="@string/open">            </item>        </menu>    </item></menu>

（3）values目录下的string.xml文件中：

<?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">文件</string>    <string name="create">新建</string>    <string name="open">打开</string>    <string name="chioce">选项</string></resources>

（3）MainActivity.java代码如下：

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 {@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);}@Overridepublic 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;}/* * 处理一级菜单 */@Overridepublic boolean onOptionsItemSelected(MenuItem item) {switch (item.getItemId()) {case R.id.file:Toast.makeText(MainActivity.this, "一级菜单file..", Toast.LENGTH_SHORT).show();break;case R.id.chioce:Toast.makeText(MainActivity.this, "一级菜单chioce..",Toast.LENGTH_SHORT).show();break;default:break;}return super.onOptionsItemSelected(item);}/* * 处理二级菜单的 */@Overridepublic boolean onMenuItemSelected(int featureId, MenuItem item) {switch (item.getItemId()) {case R.id.create1:Toast.makeText(MainActivity.this, "处理二级菜单create1..",Toast.LENGTH_SHORT).show();break;case R.id.open1:Toast.makeText(MainActivity.this, "处理二级菜单create1..",Toast.LENGTH_SHORT).show();break;case R.id.create:Toast.makeText(MainActivity.this, "处理二级菜单create..",Toast.LENGTH_SHORT).show();break;case R.id.open:Toast.makeText(MainActivity.this, "处理二级菜单open..",Toast.LENGTH_SHORT).show();break;default:break;}return super.onMenuItemSelected(featureId, item);}}

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