java - Set a countdown till 4 hours after current time[App not working] -


i want timer runs 4 hours current time, , till wrong_answer bit set 0 again, should not stop in between if application closes.

i tried variations morning , still app crashes when reach activity.

public class activitywrong extends appcompatactivity {  countdownview countview; textview tv2,txttimerhour,txttimerminute,txttimersecond ; button tryagain; calendar future; date future_date; private handler handler; private runnable runnable;   @override protected void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);     setcontentview(r.layout.activity_wrong);     txttimerhour = (textview) findviewbyid(r.id.txttimerhour);     txttimerminute = (textview) findviewbyid(r.id.txttimerminute);     txttimersecond = (textview) findviewbyid(r.id.txttimersecond);     //countview = (countdownview) findviewbyid(r.id.countdownview);     if(get_wrong_bit() == 0) {         calendar cl = calendar.getinstance();         long nowplus4hours = cl.gettimeinmillis() + 14400000;     toast.maketext(activitywrong.this, string.valueof(nowplus4hours) , toast.length_short).show();         simpledateformat formatter = new simpledateformat("yyyy-mm-dd hh:mm:ss");     toast.maketext(activitywrong.this, formatter.format(future.gettime()) , toast.length_short).show();         store_countdown(formatter.format(future.gettime()));         set_wrong_bit(1);     }      countdownstart();      tryagain.setonclicklistener(new view.onclicklistener() {         @override         public void onclick(view v) {             set_wrong_bit(0);             intent stud = new intent(activitywrong.this,activityquiz.class);             startactivity(stud);             finish();         }     });  }  public void countdownstart() {      tv2 = (textview) findviewbyid(r.id.tv2);     tryagain = (button) findviewbyid(r.id.try_again);     handler = new handler();     runnable = new runnable() {         @override         public void run() {             handler.postdelayed(this, 1000);             try {                 simpledateformat dateformat = new simpledateformat("yyyy-mm-dd hh:mm:ss");                 date futuredate = dateformat.parse(get_countdown());                 date currentdate = new date();                 if (!currentdate.after(futuredate)) {                     long diff = futuredate.gettime()                             - currentdate.gettime();                     long hours = diff / (60 * 60 * 1000);                     diff -= hours * (60 * 60 * 1000);                     long minutes = diff / (60 * 1000);                     diff -= minutes * (60 * 1000);                     long seconds = diff / 1000;                     txttimerhour.settext("" + string.format("%02d", hours));                     txttimerminute.settext("" + string.format("%02d", minutes));                     txttimersecond.settext("" + string.format("%02d", seconds));                 } else {                      tv2.settext("punishment on :)");                     tryagain.setvisibility(view.visible);                 }             } catch (exception e) {                 e.printstacktrace();             }         }     };     handler.postdelayed(runnable, 1 * 1000); }  private void set_wrong_bit(int wrong_bit) {     sharedpreferences msharedpreferences = getsharedpreferences("main",mode_private);     sharedpreferences.editor meditor = msharedpreferences.edit();     meditor.putint("wrong_bit",wrong_bit);     meditor.apply(); } private int get_wrong_bit(){     sharedpreferences msharedpreferences = getsharedpreferences("main",mode_private);     int checker = msharedpreferences.getint("wrong_bit",0);     return checker; }  private void store_countdown(string countdown) {     sharedpreferences msharedpreferences = getsharedpreferences("main",mode_private);     sharedpreferences.editor meditor = msharedpreferences.edit();     meditor.putstring("countdown",countdown);     meditor.apply(); }  private string get_countdown(){     sharedpreferences msharedpreferences = getsharedpreferences("main",mode_private);     string checker = msharedpreferences.getstring("countdown","2017-09-21 17:20:00");     return checker; }  }

i know not efficient way still want know solution.

i feel way i'm parsing future date.

i have copy pasted code app working fine ,just setting fixed date other there :

simpledateformat dateformat = new simpledateformat("yyyy-mm-dd hh:mm");                 date futuredate = dateformat.parse("2017-09-12 1:21");                 date currentdate = new date();

instead of retrieving savedpreference method .

will saving long variable help??

thanks

this see on logcat logcat:

09-12 19:05:54.111 23653-23653/? i/fa: app measurement starting up, version: 10298

09-12 19:05:54.111 23653-23653/? i/fa: enable debug logging run: adb shell setprop log.tag.fa verbose

09-12 19:05:54.119 23653-23653/? i/fa: enable faster debug mode event logging run: adb shell setprop debug.firebase.analytics.app com.bitstrips.imoji

nevermind solved .

had use:

future_date = dateformat.format("yyyy-mm-dd hh:mm:ss", new date(nowplus4hours)).tostring();

instead of :

simpledateformat formatter = new simpledateformat("yyyy-mm-dd hh:mm:ss");

:)


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