如何写菜单

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Mainactivity

package com.example.menuDemo;import android.app.Activity;import android.os.Bundle;import android.view.ContextMenu;import android.view.Menu;import android.view.MenuItem;import android.view.View;import android.view.ContextMenu.ContextMenuInfo;import android.widget.Toast;public class MainActivity extends Activity {    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);    }    // 这个方法给menu文件打气为菜单界面    @Override    public boolean onCreateOptionsMenu(Menu menu) {        getMenuInflater().inflate(R.menu.main, menu);        return true;    }    // 当menu菜单打开时的操作    @Override    public boolean onMenuOpened(int featureId, Menu menu) {        Toast.makeText(getApplicationContext(), "菜单要打开了", 0).show();        return super.onMenuOpened(featureId, menu);    }    // 当点击某个菜单时，要做的操作    @Override    public boolean onOptionsItemSelected(MenuItem item) {        int id = item.getItemId();        if (id == R.id.action_settings1) {            Toast.makeText(getApplicationContext(), "你点击了菜单一", 0).show();            return true;        }        if (id == R.id.action_settings2) {            Toast.makeText(getApplicationContext(), "你点击了菜单二", 0).show();            return true;        }        return super.onOptionsItemSelected(item);    }//  当选项菜单关闭时调用的方法    @Override    public void onOptionsMenuClosed(Menu menu) {        Toast.makeText(getApplicationContext(), "菜单要关闭了", 0).show();        super.onOptionsMenuClosed(menu);    }}

布局

activity_main

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:paddingBottom="@dimen/activity_vertical_margin"    android:paddingLeft="@dimen/activity_horizontal_margin"    android:paddingRight="@dimen/activity_horizontal_margin"    android:paddingTop="@dimen/activity_vertical_margin"    tools:context="com.example.menuDemo.MainActivity" >    <TextView        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="@string/hello_world" /></RelativeLayout>

main.xml

<menu xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    tools:context="com.example.menuDemo.MainActivity" >    <item        android:id="@+id/action_settings1"        android:orderInCategory="100"        android:showAsAction="never"        android:title="菜单一"/>    <item        android:id="@+id/action_settings2"        android:orderInCategory="100"        android:showAsAction="never"        android:title="菜单二"/></menu>

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