Android学习笔记 一级二级菜单的使用

（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> （4）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 {

@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;
}

/*
* 处理一级菜单
*/
@Override
public 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
*/
@Override
public 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);
}
}