How to create an alarm wake screen in android and disable default back button? -

hello every 1 request please give me solution of question . have created alarm wake screen when alarm started has 2 buttons snooze , dismiss , work fine . problem started when user press button on phone disappears screen , sound still playing. if have solution please provide me. thank you

this alarmservice class

import android.app.service; import android.content.intent; import android.os.ibinder;  public class alarmservice extends service {      public static string tag = alarmservice.class.getsimplename();      @override     public ibinder onbind(intent intent) {         return null;     }      @override     public int onstartcommand(intent intent, int flags, int startid) {          intent alarmintent = new intent(getbasecontext(), alarmscreen.class);         alarmintent.addflags(intent.flag_activity_new_task);         try{         alarmintent.putextras(intent);          getapplication().startactivity(alarmintent);          alarmmanagerhelper.setalarms(this);         }catch(exception e)         {             e.printstacktrace();             system.out.println(" may null intent found if not snooz or dismiss button user on alarm screen");         }         return super.onstartcommand(intent, flags, startid);      }  } 

and 1 receiver class create alarm screen

public class alarmscreen extends activity{      public final string tag = this.getclass().getsimplename();      private wakelock mwakelock;     private mediaplayer mplayer;      public static final string id = "id";     public static final string name = "name";     public static final string time_hour = "timehour";     public static final string time_minute = "timeminute";     public static final string tone = "alarmtone";     public static final string note = "note";     public static final string user = "user";      static string name;      static string note;      static string username;      static string tone;      static int timehour;      static int timeminute;     private static final int wakelock_timeout = 60 * 1000;      @override     protected void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);          //setup layout         this.setcontentview(r.layout.activity_alarm_screen);          /*parentview.getbackground().setalpha(128);*/         name = getintent().getstringextra(alarmmanagerhelper.name);         note = getintent().getstringextra(alarmmanagerhelper.note);         username = getintent().getstringextra(alarmmanagerhelper.user);         timehour = getintent().getintextra(alarmmanagerhelper.time_hour, 0);         timeminute = getintent().getintextra(alarmmanagerhelper.time_minute, 0);         tone = getintent().getstringextra(alarmmanagerhelper.tone);          textview tvname = (textview) findviewbyid(r.id.alarm_screen_name);         textview tvnote = (textview) findviewbyid(r.id.alarm_screen_note);         textview tvuser = (textview) findviewbyid(r.id.txt_nameuser);         tvname.settext(name);         tvnote.settext(note);         tvuser.settext(username);         textview tvtime = (textview) findviewbyid(r.id.alarm_screen_time);         tvtime.settext(string.format("%02d : %02d", timehour, timeminute));          displaymetrics metrics = getresources().getdisplaymetrics();         final int screenwidth = (int) (metrics.widthpixels * 0.50);         final int screenheight = (int) (metrics.heightpixels * 0.50);          // instance of vibrator current context         final vibrator v = (vibrator) getsystemservice(context.vibrator_service);          // start without delay         // each element alternates between vibrate, sleep, vibrate, sleep...         long[] pattern = {0,800,200,1000,300,1000,200,4000};          if (v.hasvibrator()) {             log.v("can vibrate", "yes");         } else {             log.v("can vibrate", "no");         }          button dismissbutton = (button) findviewbyid(r.id.alarm_screen_button);         dismissbutton.setonclicklistener(new onclicklistener() {              @override             public void onclick(view view) {                 mplayer.stop();                 v.cancel();                 finish();             }         });          //adding snooz button         button btn_snooz = (button) findviewbyid(r.id.btn_snooz);         btn_snooz.setonclicklistener(new onclicklistener() {              @override             public void onclick(view view) {                 mplayer.stop();                 v.cancel();                 sooz_activity();                 system.out.println("snooz activity started");                 finish();                }         });          //play alarm tone         mplayer = new mediaplayer();         try {             if (tone != null && !tone.equals("")) {                 uri toneuri = uri.parse(tone);                 if (toneuri != null) {                     mplayer.setdatasource(this, toneuri);                     mplayer.setaudiostreamtype(audiomanager.stream_alarm);                     mplayer.setlooping(true);                     mplayer.prepare();                     mplayer.start();                     v.vibrate(pattern, 0);                 }             }         } catch (exception e) {             e.printstacktrace();         }          //ensure wakelock release         runnable releasewakelock = new runnable() {              @override             public void run() {                  getwindow().clearflags(windowmanager.layoutparams.flag_turn_screen_on);                 getwindow().clearflags(windowmanager.layoutparams.flag_keep_screen_on);                 getwindow().clearflags(windowmanager.layoutparams.flag_show_when_locked);                 getwindow().clearflags(windowmanager.layoutparams.flag_dismiss_keyguard);              //  getwindow().setlayout(screenwidth, screenheight);              /*  getwindow().setflags(windowmanager.layoutparams.wrap_content,                          windowmanager.layoutparams.wrap_content);*/                    if (mwakelock != null && mwakelock.isheld()) {                     mwakelock.release();                 }             }         };          new handler().postdelayed(releasewakelock, wakelock_timeout);     }      @suppresswarnings("deprecation")     @override     protected void onresume() {         super.onresume();          // set window keep screen on         getwindow().addflags(windowmanager.layoutparams.flag_turn_screen_on);         getwindow().addflags(windowmanager.layoutparams.flag_keep_screen_on);         getwindow().addflags(windowmanager.layoutparams.flag_show_when_locked);         getwindow().addflags(windowmanager.layoutparams.flag_dismiss_keyguard);      //  getwindow().setlayout(screenwidth, screenheight);          // acquire wakelock         powermanager pm = (powermanager) getapplicationcontext().getsystemservice(context.power_service);         if (mwakelock == null) {             mwakelock = pm.newwakelock((powermanager.full_wake_lock | powermanager.screen_bright_wake_lock | powermanager.acquire_causes_wakeup), tag);         }          if (!mwakelock.isheld()) {             mwakelock.acquire();             log.i(tag, "wakelock aquired!!");         }      }      @override     protected void onpause() {         super.onpause();          if (mwakelock != null && mwakelock.isheld()) {             mwakelock.release();         }     }       public void sooz_activity(){         pendingintent pintent = creatependingintent(this);          long currenttimemillis = system.currenttimemillis();         long nextupdatetimemillis = currenttimemillis + 5 * dateutils.minute_in_millis;         time nextupdatetime = new time();         nextupdatetime.set(nextupdatetimemillis);         setalarm(this, nextupdatetimemillis, pintent);     }      private static pendingintent creatependingintent(context context) {         intent intent = new intent(context, alarmservice.class);         //intent.putextra(id, model.id);         intent.putextra(name,name);         intent.putextra(time_hour,timehour);         intent.putextra(time_minute,timeminute);         intent.putextra(tone,tone);         intent.putextra(note,note);         intent.putextra(user,username);         return pendingintent.getservice(context,1, intent, pendingintent.flag_update_current);     }       @suppresslint("newapi")     private static void setalarm(context context, long nextupdatetimemillis, pendingintent pintent) {         alarmmanager alarmmanager = (alarmmanager) context.getsystemservice(context.alarm_service);         if (android.os.build.version.sdk_int >= android.os.build.version_codes.kitkat) {             alarmmanager.setexact(alarmmanager.rtc_wakeup, nextupdatetimemillis, pintent);         } else {             alarmmanager.set(alarmmanager.rtc_wakeup, nextupdatetimemillis, pintent);         }     }  } 

and works fine when alarm screen appears on phone main screen , user pressed default phone button disappear main screen , sound , vibration continue until go stop running task.

i think "the new boston" has great video understanding going on here. https://www.youtube.com/watch?v=-g91hp3t6sg might looking onpause() stop sound. think video starting point monitoring how app behaving in different states.