Turning on screen and keep screen lon

Reference:

http://stackoverflow.com/questions/2891337/turning-on-screen-programmatically

Advance:
Turn on screen and dismiss keyguard
http://stackoverflow.com/questions/30246425/turning-on-screen-from-receiver-service

Code snippet:

在需要打開螢幕的地方加入下面的 code
WakeLock wl = ((PowerManager)getSystemService(POWER_SERVICE)).newWakeLock(
     PowerManager.SCREEN_BRIGHT_WAKE_LOCK | PowerManager.ACQUIRE_CAUSES_WAKEUP, "TAG");
wl.acquire();

在離開前要記得釋放 wake lock，以免螢幕保持開啟，造成耗電的問題
wl.release();

Note:
釋放 (release)的 wake lock要和獲取 (acquire)的是同一個，不要再重新建立一個新的wake lock，否則釋放 wake lock時會不能正常運作