android - Failed to update existing theme for activity -

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i see error when execute code: 

e/instantrun: failed update existing theme activity com.example.android.getup.mainactivity@1ebe5a1           java.lang.nosuchfieldexception: no field mtheme in class landroid/content/res/resources$theme; (declaration of 'android.content.res.resources$theme' appears in /system/framework/framework.jar)               @ java.lang.class.getdeclaredfield(native method)               @ com.android.tools.fd.runtime.monkeypatcher.monkeypatchexistingresources(monkeypatcher.java:374)               @ com.android.tools.fd.runtime.server.restart(server.java:523)               @ com.android.tools.fd.runtime.server.access$600(server.java:61)               @ com.android.tools.fd.runtime.server$socketserverreplythread.handle(server.java:318)               @ com.android.tools.fd.runtime.server$socketserverreplythread.run(server.java:190)               @ com.android.tools.fd.runtime.server$socketserverthread.run(server.java:158)               @ java.lang.thread.run(thread.java:761)

what mean?

mainactivity.java

in general app alarm app if important , it's called getup 

package com.example.android.getup;  import android.content.broadcastreceiver; import android.content.context; import android.content.intent; import android.content.intentfilter; import android.os.build; import android.os.bundle; import android.support.design.widget.floatingactionbutton; import android.support.v7.app.appcompatactivity; import android.view.menu; import android.view.menuitem; import android.view.view; import android.widget.textview;  import com.example.android.getup.animations.resizeanimation; import com.example.android.getup.interfaces.fragmentcommunicator;  import java.text.simpledateformat; import java.util.calendar; import java.util.date;  public class mainactivity extends appcompatactivity implements fragmentcommunicator{  private textview displaytime, displaymonthyear, displaydayname; broadcastreceiver _broadcastreceiver; private final simpledateformat _sdfwatchtime = new simpledateformat("hh.mm");  @override protected void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);     setcontentview(r.layout.activity_main);      // initialization     displaytime = (textview) findviewbyid(r.id.display_time);     displaymonthyear = (textview) findviewbyid(r.id.display_month_year);     displaydayname = (textview) findviewbyid(r.id.display_day_name);      // setting day of month     displaytime.settext(_sdfwatchtime.format(new date()));     displaymonthyear.settext(new simpledateformat("mmm dd, yyyy").format(system.currenttimemillis()));     setdisplaydayname();      // coolest button ever :)     final floatingactionbutton fab = (floatingactionbutton) findviewbyid(r.id.fab);     final view myview = findviewbyid(r.id.ll_reveal);     myview.setvisibility(view.invisible);     /**      *      * when fab clicked      *      * **/     fab.setonclicklistener(new view.onclicklistener() {          boolean expandorcollapse = true; // seeing if adding alarm panel needs extended or collapsed         @override         public void onclick(view view) {               if (expandorcollapse) { // if panel extended                 resizeanimation.expand(myview); // expand animation                 if (build.version.sdk_int >= build.version_codes.lollipop) {                     fab.setimagedrawable(getresources().getdrawable(r.drawable.ic_clear_white_48dp, mainactivity.this.gettheme())); // changing fab's icon                 } else {                     fab.setimagedrawable(getresources().getdrawable(r.drawable.ic_clear_white_48dp));                 }                  expandorcollapse = false; // next time fab clicked, it'll collapse add alarm panel              }else{                 resizeanimation.collapse(myview);                 if (build.version.sdk_int >= build.version_codes.lollipop) {                     fab.setimagedrawable(getresources().getdrawable(r.drawable.ic_alarm_add_white_48dp, mainactivity.this.gettheme()));                 } else {                     fab.setimagedrawable(getresources().getdrawable(r.drawable.ic_alarm_add_white_48dp));                 }                 expandorcollapse = true;             }       } }); }  /**  * system send broadcast event @ exact beginning of every minutes based on system clock.  **/ @override public void onstart() {     super.onstart();     _broadcastreceiver = new broadcastreceiver() {         @override         public void onreceive(context ctx, intent intent) {             if (intent.getaction().compareto(intent.action_time_tick) == 0)                 displaytime.settext(_sdfwatchtime.format(new date()));      };      registerreceiver(_broadcastreceiver, new intentfilter(intent.action_time_tick)); }   @override public void onstop() {     super.onstop();     if (_broadcastreceiver != null)         unregisterreceiver(_broadcastreceiver); }  private void setdisplaydayname(){     string day = "";     switch (calendar.getinstance().get(calendar.day_of_week)){         case 1: day = "sunday"; break;         case 2: day = "monday"; break;         case 3: day = "tuesday"; break;         case 4: day = "wednesday"; break;         case 5: day = "thursday"; break;         case 6: day = "friday"; break;         case 7: day = "saturday"; break;     }     displaydayname.settext(day);  }  @override public void response(string[] alarminfo) {     alarmslistfragment alarmslistf = (alarmslistfragment) getfragmentmanager().findfragmentbyid(r.id.alarm_box_container_fragment);     alarmslistf.onrecvdata(alarminfo); }  @override public boolean oncreateoptionsmenu(menu menu) {     // inflate menu; adds items action bar if present.     getmenuinflater().inflate(r.menu.menu_main, menu);     return true; }  @override public boolean onoptionsitemselected(menuitem item) {     // handle action bar item clicks here. action bar     // automatically handle clicks on home/up button, long     // specify parent activity in androidmanifest.xml.     int id = item.getitemid();      //noinspection simplifiableifstatement     if (id == r.id.action_settings) {         return true;     }     return super.onoptionsitemselected(item);   } }

if need more code let me know because im not sure necessarily.

when getting error, solved in android studio going file > invalidate caches / restart....

source: this answer


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