Android turn on the screen -

i making application activity launch scheduled alarmmanager. appear if screen turned off , device locked.

to achive set window flags

final window win = getwindow(); win.addflags(windowmanager.layoutparams.flag_show_when_locked         | windowmanager.layoutparams.flag_dismiss_keyguard); win.addflags(windowmanager.layoutparams.flag_keep_screen_on         | windowmanager.layoutparams.flag_turn_screen_on         | windowmanager.layoutparams.flag_allow_lock_while_screen_on); 

and try obtain lock screen

if(_lock == null) {     powermanager pm = (powermanager)app.getappcontext()             .getsystemservice(context.power_service);      _lock = pm.newwakelock(             powermanager.full_wake_lock, "screenon");     _lock.acquire(); } 

the _lock powermanager.wakelock released in onpause

protected void onpause() {      if(_lock != null)      {           _lock.release();      } } 

this code executed in oncreate , onrestart. works ok if activity not launched yet.

but if launched earlier screen not turned off.

• onrestart called first
• onresume called
• onpause called immediately

so activity not launched. question how turn on screen in such situation. (i using api 15).

just use code :

final window win = getwindow(); win.addflags(windowmanager.layoutparams.flag_show_when_locked         | windowmanager.layoutparams.flag_dismiss_keyguard); 

in oncreate() , remove other activity-cycle methods if not doing else this.

i don't think need more code use perform it.