android ConfigChanges

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 displ ayed in.用户所在地区发生变化。
“ touchscreen “	The touchscreen has changed. (This should never normally happ en.)
“ 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