众所周知,默认状况下,从水平变为垂直,Android的操做过程为关闭Activity,再在当前方向打开此Activity。此过程通常而言没有什么不妥,只是会带来一个问题:用户数据丢失,也就是说,Activity 重启,必然使得内容初始化。补救措施是在变换方向时保存当前内容,如webview的url等。html
这种作法固然不够好玩。android
正确的作法是,配置Activity的变化状态(这么说可能不大准确。),在AndroidManifest.xml中,对于每个Activity的配置,有一个属性,android:configChanges=""。这个属性的官方解释是web
经过设置这个属性能够使Activity捕捉设备状态变化,如下是能够被识别的内容: app
CONFIG_FONT_SCALE那么,以下配置则能够完成咱们想要的结果:url
补充:spa
每个config的具体说明:code
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,每一个国家都有本身独立的MCC,能够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 |