android ConfigChanges
在一个Activity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，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。
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 |
但是显然，大部分应用不会去覆盖onConfigurationChanged方法，太累！但是我们还是必须有android：ConfigChanges，因为有些手机不配置这一项的话，在状态发生改变的时候，居然会报错……
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