Android 中MenuInflater的运用(布局定义菜单)_Android

Android 中MenuInflater的使用(布局定义菜单)!

大家好，我们上一节讲的是LayoutInflater 的使用，而这一节我将讲一下MenuInflater ,顾名思义，LayoutInflater 是用来解析定义在layout 下的布局文件，那么MenuInflater 是不是用来解析定义在menu 目录下的菜单布局文件呢？恭喜你答对了！(*^__^*) 嘻嘻……

我们传统意义上的定义菜单感觉比较繁琐，当我们使用MenuInflater 来生成菜单，你会发现是多么的爽朗，呵呵，我今天的小Demo,是定义四个菜单，并且实现了一个菜单事件。就是我们点击设置 (Setting )菜单，进入手机设置状态！下面看一下效果图:

????

下面是实现Demo 的详细步骤:

一、建立一个Android 工程我们命名为MenuInflaterDemo .

二、在res 目录下创建menu 目录，并且创建options_menu.xml (我们定义的菜单)文件,代码如下:

view?plaincopy?to?clipboardprint? ?
<?xml?version="1.0"?encoding="utf-8"?>??? ?
<menu??? ?
??xmlns:android="http://schemas.android.com/apk/res/android">??? ?
????<item?android:id="@+id/menu_add"?? ?
??????????android:title="Add"?? ?
??????????android:icon="@android:drawable/ic_menu_add"?? ?
???????????/>??? ?
????<item?android:id="@+id/menu_wallaper"?? ?
??????????android:title="Wallpaper"?? ?
??????????android:icon="@android:drawable/ic_menu_gallery"?? ?
???????????/>??? ?
???<item?android:id="@+id/menu_search"?? ?
??????????android:title="Search"?? ?
??????????android:icon="@android:drawable/ic_search_category_default"?? ?
???????????/>??? ?
???<item?android:id="@+id/menu_setting"?? ?
??????????android:title="Settings"?? ?
??????????android:icon="@android:drawable/ic_menu_preferences"?? ?
???????????/>??? ?
</menu>?? ?
<?xml?version="1.0"?encoding="utf-8"?>?
<menu?
??xmlns:android="http://schemas.android.com/apk/res/android">?
????<item?android:id="@+id/menu_add"?
??????????android:title="Add"?
??????????android:icon="@android:drawable/ic_menu_add"?
???????????/>?
????<item?android:id="@+id/menu_wallaper"?
??????????android:title="Wallpaper"?
??????????android:icon="@android:drawable/ic_menu_gallery"?
???????????/>?
???<item?android:id="@+id/menu_search"?
??????????android:title="Search"?
??????????android:icon="@android:drawable/ic_search_category_default"?
???????????/>?
???<item?android:id="@+id/menu_setting"?
??????????android:title="Settings"?
??????????android:icon="@android:drawable/ic_menu_preferences"?
???????????/>?
</menu>?

三、主类MenuInflaterDemo.java 的编码，这里写的代码很少哦，我这里只写了第四个菜单(Settings )的响应事件.全部代码如下:

view?plaincopy?to?clipboardprint? ?
package?com.android.tutor;??? ?
import?android.app.Activity;??? ?
import?android.content.Intent;??? ?
import?android.os.Bundle;??? ?
import?android.view.Menu;??? ?
import?android.view.MenuInflater;??? ?
import?android.view.MenuItem;??? ?
public?class?MenuInflaterDemo?extends?Activity?{??? ?
????@Override?? ?
????public?void?onCreate(Bundle?savedInstanceState)?{??? ?
????????super.onCreate(savedInstanceState);??? ?
????????setContentView(R.layout.main);??? ?
????}??? ?
??????? ?
????@Override?? ?
????public?boolean?onCreateOptionsMenu(Menu?menu)?{??? ?
????????MenuInflater?inflater?=?getMenuInflater();??? ?
????????inflater.inflate(R.menu.options_menu,?menu);??????? ?
????????return?true;??? ?
????}??? ?
??????? ?
????@Override?? ?
????public?boolean?onOptionsItemSelected(MenuItem?item)?{??? ?
????????switch?(item.getItemId())?{??? ?
????????case?R.id.menu_add:??? ?
??????????????? ?
????????????break;??? ?
????????case?R.id.menu_wallaper:??? ?
????????????break;??? ?
????????case?R.id.menu_search:??? ?
????????????break;??? ?
????????case?R.id.menu_setting:??? ?
????????????showSettings();??? ?
????????????break;??? ?
????????}??? ?
????????return?super.onOptionsItemSelected(item);??? ?
????}??? ?
??????? ?
??????? ?
????private?void?showSettings(){??? ?
??????????? ?
?????final?Intent?settings?=?new?Intent(android.provider.Settings.ACTION_SETTINGS);??? ?
????????????settings.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK?|??? ?
????????????????????Intent.FLAG_ACTIVITY_RESET_TASK_IF_NEEDED);??? ?
??????????????? ?
????????startActivity(settings);??? ?
???}??? ?
}?? ?
package?com.android.tutor; ?
import?android.app.Activity; ?
import?android.content.Intent; ?
import?android.os.Bundle; ?
import?android.view.Menu; ?
import?android.view.MenuInflater; ?
import?android.view.MenuItem; ?
public?class?MenuInflaterDemo?extends?Activity?{ ?
????@Override?
????public?void?onCreate(Bundle?savedInstanceState)?{ ?
????????super.onCreate(savedInstanceState); ?
????????setContentView(R.layout.main); ?
????} ?
???? ?
????@Override?
????public?boolean?onCreateOptionsMenu(Menu?menu)?{ ?
?????MenuInflater?inflater?=?getMenuInflater(); ?
?????inflater.inflate(R.menu.options_menu,?menu);? ?
?????return?true; ?
????} ?
???? ?
????@Override?
????public?boolean?onOptionsItemSelected(MenuItem?item)?{ ?
?????switch?(item.getItemId())?{ ?
??case?R.id.menu_add: ?
??? ?
???break; ?
??case?R.id.menu_wallaper: ?
???break; ?
??case?R.id.menu_search: ?
???break; ?
??case?R.id.menu_setting: ?
???showSettings(); ?
???break; ?
??} ?
?????return?super.onOptionsItemSelected(item); ?
????} ?
???? ?
???? ?
????private?void?showSettings(){ ?
????? ?
?????final?Intent?settings?=?new?Intent(android.provider.Settings.ACTION_SETTINGS); ?
?????????settings.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK?| ?
?????????????????Intent.FLAG_ACTIVITY_RESET_TASK_IF_NEEDED); ?
????????? ?
?????startActivity(settings); ?
???} ?
}? ?