Activity中ConfigChanges属性的用法

通过设置这个属性可以使Activity捕捉设备状态变化，以下是可以被识别的内容： 

CONFIG_FONT_SCALE

CONFIG_MCC

CONFIG_MNC

CONFIG_LOCALE

CONFIG_TOUCHSCREEN

CONFIG_KEYBOARD

CONFIG_NAVIGATION

CONFIG_ORIENTATION

设置方法：将下列字段用“|”符号分隔开，例如：“locale|navigation|orientation

”

Value Description

“mcc“ The IMSI mobile country code (MCC) has changed — that is, a SIM hasbeen detected and updated the MCC.移动国家号码，由三位数字组成，每个国家都有自己独立的MCC，可以识别手机用户所属国家。

“mnc“ The IMSI mobile network code (MNC) has changed — that is, a SIM hasbeen detected and updated the MNC.移动网号，在一个国家或者地区中，用于区分手机用户的服务商。

“locale“ The locale has changed — for example, the user has selected a new language that text should be displayed in.用户所在地区发生变化。

“touchscreen“ The touchscreen has changed. (This should never normally happen.)

“keyboard“ The keyboard type has changed — for example, the user has plugged in an external keyboard.键盘模式发生变化，例如：用户接入外部键盘输入。

“keyboardHidden“ The keyboard accessibility has changed — for example, the user has slid the keyboard out to expose it.用户打开手机硬件键盘

“navigation“ The navigation type has changed. (This should never normally happen.)

“orientation“ The screen orientation has changed — that is, the user has rotated the device.设备旋转，横向显示和竖向显示模式切换。

“fontScale“ The font scaling factor has changed — that is, the user has selected a new global font size.全局字体大小缩放发生改变

通过一个例子介绍这个属性的用法： 首先需要修改项目的manifest:

?View Code XML

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

      package="com.androidres.ConfigChangedTesting"

      android:versionCode="1"

      android:versionName="1.0.0">

    <application android:icon="@drawable/icon" android:label="@string/app_name">

        <activity android:name=".ConfigChangedTesting"

                  android:label="@string/app_name"

                  android:configChanges="keyboardHidden|orientation">

            <intent-filter>

                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />

            </intent-filter>

        </activity>

    </application>

</manifest>

在Activity中添加了 android:configChanges属性，目的是当所指定属性(Configuration Changes)发生改变时，通知程序调用 onConfigurationChanged()函数。 创建一个Layout UI:

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

    android:orientation="vertical"

    android:layout_width="fill_parent"

    android:layout_height="fill_parent"

    >

<Button

        android:id="@+id/pick"

    android:layout_height="wrap_content"

    android:text="Pick"

    />

        android:id="@+id/view"

    android:text="View"

</LinearLayout>

这个简单的UI包含两个按钮，其中一个是通过Contact列表选择一个联系人，另外一个是查看当前选择联系人的详细内容

项目的Java源代码：