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文字


MenuInflater

版本:Android 2.3 r1

結(jié)構(gòu)

繼承關(guān)系

public class MenuInflater extends Object

????????

java.lang.Object

android.view.MenuInflater

子類及間接子類

直接子類

TabActivity

?

概述

這個類是用來實例化菜單XML文件成菜單對象。

由于性能的原因,由于程序創(chuàng)建時候就加載一些預(yù)處理XML文件,Menu過多就造成很重的負擔。因此,這是目前無法在運行時使用多于一個XmlPullParserxml文件去使用MenuInflater,它只能使用一個XmlPullParser返回的編譯過的資源(R.某些文件)

?

構(gòu)造函數(shù)

???????? public MenuInflater (Context context)

構(gòu)造填充(inflater)一個菜單

參見

getMenuInflater()

?

公共方法

???????? public void inflate (int menuRes, Menu menu)

菜單層次從一個指定的xml資源去填充,如果有錯誤會拋擲InflateException。

參數(shù)

menuRes ??????? 要加載XML布局文件中的資源ID(例如R.menu.main_activity

menu ????? 要填充的菜單,這些項目和子菜單就被添加到要填充菜單中

補充

文章精選

MenuInflater Android菜單從xml創(chuàng)建方法

???????? AndroidMenuInflater實例

???????? Android MenuInflater的使用(布局定義菜單)

示例代碼

新建一個android2.2的項目,項目文件列表

MenuInfalterTest.java

public class MenuInflaterTest extends Activity {

??? @Override

??? public void onCreate(Bundle savedInstanceState) {

?????? super.onCreate(savedInstanceState);

?????? setContentView(R.layout.main);

??? }

?

??? public boolean onCreateOptionsMenu(Menu menu) {

?????? // 獲取當前的菜單

?????? MenuInflater inflater = getMenuInflater();

?????? // 填充菜單

?????? inflater.inflate(R.menu.option_menu, menu);

?????? return true;

??? }

?

???

??? 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() {

?????? 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);

??? }

}

}

?

Main.xml

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

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

??? android:orientation="vertical"

??? android:layout_width="fill_parent"

??? android:layout_height="fill_parent"

??? >

<TextView?

??? android:layout_width="fill_parent"

??? android:layout_height="wrap_content"

??? android:text="@string/hello"

??? />

</LinearLayout>

?

Option_menu.xml

<?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>?

?


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