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android:configChanges属性

时间:2016-09-13 13:08:38      阅读:220      评论:0      收藏:0      [点我收藏+]

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对android:configChanges属性,一般认为有以下几点:

1、不设置Activity的android:configChanges时,切屏会重新调用各个生命周期,切横屏时会执行一次,切竖屏时会执行两次

2、设置Activity的android:configChanges="orientation"时,切屏还是会重新调用各个生命周期,切横、竖屏时只会执行一次

3、设置Activity的android:configChanges="orientation|keyboardHidden"时,切屏不会重新调用各个生命周期,只会执行onConfigurationChanged方法

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“

 

扩张:

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


android:configChanges属性

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原文地址:http://www.cnblogs.com/liaojie970/p/5867881.html

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