转屏，ConfigChanges

通过设置ConfigChanges这个属性可以捕捉设备状态变化。

例转屏时，保存所做操作继续进行。具体设置如下：
1 在相关的AndroidMainfest.xml中
<activity
添加android:configChanges="orientation"
2 在相关的.java文件中添加方法

  @Override    public void onConfigurationChanged(Configuration newConfig) {            super.onConfigurationChanged(newConfig);            if (this.getResources().getConfiguration().orientation == Configuration.ORIENTATION_LANDSCAPE) {        //landscape表示横向            } else if (this.getResources().getConfiguration().orientation == Configuration.ORIENTATION_PORTRAIT) {       //portrait表示纵向            }    }

在android中每次屏幕的切换会重启Activity。加上configChanges=“keyboardHidden”属性，就不会重启activity，而是去调用onConfigurationChanged方法。

ConfigChanges设置方法：将下列字段用“|”分隔开，例：“orientation|keyboardHidden"

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

具体见android.content.res.configuration

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