android 中 FLAG_SHOW_WHEN_LOCKED 的用法及解释

如何让一个activity 浮在锁屏界面的上方，返回即进入解锁界面。譬如在锁屏界面，来电时是不需要先解锁才能接听电话的。这样能带来快捷。如果你想在android 上实现 iphone 4s 上面在锁屏界面就能进照相机的话也可以按此方式来进行。只需要在 Camera 的 activity 的 onResume 函数中添加如下 flag 即可实现。
import android.view.Window; import android.view.WindowManager;
final Window win = activity.getWindow(); final WindowManager.LayoutParams params = win.getAttributes(); params.flags |= WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED;
/** Window flag: special flag to let windows be shown when the screen
* is locked. This will let application windows take precedence over
* key guard or any other lock screens. Can be used with
* {@link #FLAG_KEEP_SCREEN_ON} to turn screen on and display windows
* directly before showing the key guard window. Can be used with
* {@link #FLAG_DISMISS_KEYGUARD} to automatically fully dismisss
* non-secure keyguards. This flag only applies to the top-most
* full-screen window.
*/
public static final int FLAG_SHOW_WHEN_LOCKED = 0x00080000;

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