【Activity】android:configChanges简介

来源:互联网 发布:周星驰演技 知乎 编辑:程序博客网 时间:2024/05/18 06:29

http://blog.sina.com.cn/s/blog_8d3b7b0f01016afa.html


android中的组件Activity在manifest.xml文件中可以指定参数android:ConfigChanges,用于捕获手机状态的改变。在Activity中添加了android:configChanges属性,在当所指定属性(ConfigurationChanges)发生改变时,通知程序调用onConfigurationChanged()函数。
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 SIMhasbeen detected and updated theMCC.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 SIMhasbeen detected and updated theMNC.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 anew language that text should be displayedin.用户所在地区发生变化。

touchscreen

The touchscreen has changed. (This should never normallyhappen.)

keyboard

The keyboard type has changed — for example, the user hasplugged in an externalkeyboard.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 userhas 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 normallyhappen.)

orientation

The screen orientation has changed — that is, the user hasrotated 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 hasselected a new global font size.全局字体大小缩放发生改变

  因为有些手机不配置这一项的话,在状态发生改变的时候,会容易报错。


但是,自从Android 3.2(API 13),在设置Activity的android:configChanges="orientation|keyboardHidden"后,还是一样会重新调用各个生命周期的。因为screen size也开始跟着设备的横竖切换而改变。所以,在AndroidManifest.xml里设置的MiniSdkVersion和 TargetSdkVersion属性大于等于13的情况下,如果你想阻止程序在运行时重新加载Activity,除了设置"orientation",你还必须设置"ScreenSize"。

解决方法:

AndroidManifest.xml中设置android:configChanges="orientation|screenSize“


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