按下电源按钮时，通常会启动屏幕锁定.这可能会触发当前前台活动的配置更改(通常是屏幕锁定在纵向模式下)，导致它被销毁并重新创建.

When you press the power button, the screen lock usually kicks in. This may trigger a configuration change on the activity currently in the foreground (the screen lock is usually in portrait mode), causing it to be destroyed and recreated.

在AndroidManifest.xml中为此类活动声明android:configChanges="keyboardHidden|orientation"可以防止销毁这些活动并重新创建它们，但也意味着您可以通过覆盖

Declaring android:configChanges="keyboardHidden|orientation" for such activities in AndroidManifest.xml prevents them to be destroyed and recreated but also implies that you will handle the configuration changes by yourself (if necessary) by overriding onConfigurationChanged