android - I am facing error to fetch FloatingSearchView result inside ArraList: (java.lang.String)' on a null object reference -

my fragment code.

private final string tag = "blankfragment";  public static final long find_suggestion_simulated_delay = 250;  private floatingsearchview msearchview; private appbarlayout mappbar; private textview transtextview; private translationdatasource translation_data_source;   private boolean misdarksearchtheme = false;  private string mlastquery = "";  public scrollingsearchexamplefragment() {     // required empty public constructor }  @override public view oncreateview(layoutinflater inflater, viewgroup container,                          bundle savedinstancestate) {      return inflater.inflate(r.layout.fragment_scrolling_search_example, container, false);  }  @override public void onviewcreated(view view, @nullable bundle savedinstancestate) {     super.onviewcreated(view, savedinstancestate);     msearchview = (floatingsearchview) view.findviewbyid(r.id.floating_search_view);     mappbar = (appbarlayout) view.findviewbyid(r.id.appbar);     transtextview = (textview) view.findviewbyid(r.id.wordtranslated);      mappbar.addonoffsetchangedlistener(this);      setupdrawer();     setupsearchbar(); }  private void setupsearchbar() {     msearchview.setonquerychangelistener(new floatingsearchview.onquerychangelistener() {          @override         public void onsearchtextchanged(string oldquery, final string newquery) {              if (!oldquery.equals("") && newquery.equals("")) {                 msearchview.clearsuggestions();             } else {                  //this shows top left circular progress                 //you can call ever want,                 //it makes sense when loading in                 //the background.                 msearchview.showprogress();                  //simulates query call data source                 //with new query.                 datahelper.findsuggestions(getactivity(), newquery, 5,                         find_suggestion_simulated_delay, new datahelper.onfindsuggestionslistener() {                              @override                             public void onresults(list<colorsuggestion> results) {                                  //this swap data ,                                 //render collapse/expand animations necessary                                 msearchview.swapsuggestions(results);                                  //let users know background                                 //process has completed                                 msearchview.hideprogress();                             }                         });             }              log.d(tag, "onsearchtextchanged()");         }     });      msearchview.setonsearchlistener(new floatingsearchview.onsearchlistener() {         @override         public void onsuggestionclicked(final searchsuggestion searchsuggestion) {              colorsuggestion colorsuggestion = (colorsuggestion) searchsuggestion;             datahelper.findcolors(getactivity(), colorsuggestion.getbody(),                     new datahelper.onfindcolorslistener() {                          @override                         public void onresults(list<colorwrapper> results) {                             //show search results                         }                      });             log.d(tag, "onsuggestionclicked()");              mlastquery = searchsuggestion.getbody();         }          @override         public void onsearchaction(string query) {             mlastquery = query;              toast.maketext(getactivity(), query, toast.length_short).show();              string searchword = query.tostring();              transtextview.settext("");              arraylist<translation> translation_array_long = translation_data_source.getengengtranslation(msearchview.getquery());              if(translation_array_long.size() > 0)             {                 transtextview.append(html.fromhtml("<p><b>" + msearchview.getquery() + "</b></p>"));                 // ("<p><b>source: wikipedia</b></p>"));                  for(int = 0; < translation_array_long.size(); i++)                 {                     transtextview.append(html.fromhtml("<p>" + translation_array_long.get(i).gettranslation() + "</p>"));                 }                  transtextview.append(html.fromhtml("<br/><br/>"));             }             else             {                 transtextview.append("word not found!");             }              /*             datahelper.findcolors(getactivity(), query,                     new datahelper.onfindcolorslistener() {                          @override                         public void onresults(list<colorwrapper> results) {                              //show search results                         }                      });                     */             log.d(tag, "onsearchaction()");         }     });      msearchview.setonfocuschangelistener(new floatingsearchview.onfocuschangelistener() {         @override         public void onfocus() {              //show suggestions when search bar gains focus (typically history suggestions)             msearchview.swapsuggestions(datahelper.gethistory(getactivity(), 3));              log.d(tag, "onfocus()");         }          @override         public void onfocuscleared() {              //set title of bar when focus returned new query begins             msearchview.setsearchbartitle(mlastquery);              //you can set setsearchtext(...) make keep query there when not focused , when focus returns             //msearchview.setsearchtext(searchsuggestion.getbody());              log.d(tag, "onfocuscleared()");         }     });       //handle menu clicks same way     //in regular activity     msearchview.setonmenuitemclicklistener(new floatingsearchview.onmenuitemclicklistener() {         @override         public void onactionmenuitemselected(menuitem item) {              if (item.getitemid() == r.id.action_change_colors) {                  misdarksearchtheme = true;                  //demonstrate setting colors items                 msearchview.setbackgroundcolor(color.parsecolor("#787878"));                 msearchview.setviewtextcolor(color.parsecolor("#e9e9e9"));                 msearchview.sethinttextcolor(color.parsecolor("#e9e9e9"));                 msearchview.setactionmenuoverflowcolor(color.parsecolor("#e9e9e9"));                 msearchview.setmenuitemiconcolor(color.parsecolor("#e9e9e9"));                 msearchview.setleftactioniconcolor(color.parsecolor("#e9e9e9"));                 msearchview.setclearbtncolor(color.parsecolor("#e9e9e9"));                 msearchview.setdividercolor(color.parsecolor("#bebebe"));                 msearchview.setleftactioniconcolor(color.parsecolor("#e9e9e9"));             } else {                  //just print action                 toast.maketext(getactivity().getapplicationcontext(), item.gettitle(),                         toast.length_short).show();             }          }     });      //use listener listen menu clicks when app:floatingsearch_leftaction="showhome"     msearchview.setonhomeactionclicklistener(new floatingsearchview.onhomeactionclicklistener() {         @override         public void onhomeclicked() {              log.d(tag, "onhomeclicked()");         }     });      /*      * here have access left icon , text of given suggestion      * item after bound suggestion list. can utilize      * callback change properties of left icon , text. example,      * can load left icon images using favorite image loading library, or change text color.      *      *      * important:      * keep in mind suggestion list recyclerview, views reused different      * items in list.      */     msearchview.setonbindsuggestioncallback(new searchsuggestionsadapter.onbindsuggestioncallback() {         @override         public void onbindsuggestion(view suggestionview, imageview lefticon,                                      textview textview, searchsuggestion item, int itemposition) {             colorsuggestion colorsuggestion = (colorsuggestion) item;              string textcolor = misdarksearchtheme ? "#ffffff" : "#000000";             string textlight = misdarksearchtheme ? "#bfbfbf" : "#787878";              if (colorsuggestion.getishistory()) {                 lefticon.setimagedrawable(resourcescompat.getdrawable(getresources(),                         r.drawable.ic_history_black_24dp, null));                  util.seticoncolor(lefticon, color.parsecolor(textcolor));                 lefticon.setalpha(.36f);             } else {                 lefticon.setalpha(0.0f);                 lefticon.setimagedrawable(null);             }              textview.settextcolor(color.parsecolor(textcolor));             string text = colorsuggestion.getbody()                     .replacefirst(msearchview.getquery(),                             "<font color=\"" + textlight + "\">" + msearchview.getquery() + "</font>");             textview.settext(html.fromhtml(text));         }      }); }  @override public void onoffsetchanged(appbarlayout appbarlayout, int verticaloffset) {     msearchview.settranslationy(verticaloffset); }  @override public boolean onactivitybackpress() {     //if msearchview.setsearchfocused(false) causes focused search     //to close, don't want close activity. if msearchview.setsearchfocused(false)     //returns false, know search closed call didn't change focus     //state , makes sense call supper onbackpressed() , close activity     if (!msearchview.setsearchfocused(false)) {         return false;     }     return true; }  private void setupdrawer() {     attachsearchviewactivitydrawer(msearchview); } 

08-18 15:58:49.443 5570-5570/com.arlib.floatingsearchviewdemo e/inputeventsender: exception dispatching finished signal. 08-18 15:58:49.443 5570-5570/com.arlib.floatingsearchviewdemo e/messagequeue-jni: exception in messagequeue callback: handlereceivecallback 08-18 15:58:49.444 5570-5570/com.arlib.floatingsearchviewdemo e/messagequeue-jni: java.lang.nullpointerexception: attempt invoke virtual method 'java.util.arraylist com.arlib.floatingsearchviewdemo.data.translationdatasource.getengengtranslation(java.lang.string)' on null object reference @ com.arlib.floatingsearchviewdemo.fragment.scrollingsearchexamplefragment$2.onsearchaction(scrollingsearchexamplefragment.java:141) @ com.arlib.floatingsearchview.floatingsearchview$9.onsearchkeyclicked(floatingsearchview.java:662) @ com.arlib.floatingsearchview.util.view.searchinputview$1.onkey(searchinputview.java:19) @ android.view.view.dispatchkeyevent(view.java:8406) @ android.view.viewgroup.dispatchkeyevent(viewgroup.java:1495) @ android.view.viewgroup.dispatchkeyevent(viewgroup.java:1495) @ android.view.viewgroup.dispatchkeyevent(viewgroup.java:1495) @ android.view.viewgroup.dispatchkeyevent(viewgroup.java:1495) @ android.view.viewgroup.dispatchkeyevent(viewgroup.java:1495) @ android.view.viewgroup.dispatchkeyevent(viewgroup.java:1495) @ android.view.viewgroup.dispatchkeyevent(viewgroup.java:1495) @ android.view.viewgroup.dispatchkeyevent(viewgroup.java:1495) @ android.view.viewgroup.dispatchkeyevent(viewgroup.java:1495) @ android.view.viewgroup.dispatchkeyevent(viewgroup.java:1495) @ android.view.viewgroup.dispatchkeyevent(viewgroup.java:1495) @ android.view.viewgroup.dispatchkeyevent(viewgroup.java:1495) @ android.view.viewgroup.dispatchkeyevent(viewgroup.java:1495) @ android.view.viewgroup.dispatchkeyevent(viewgroup.java:1495) @ android.view.viewgroup.dispatchkeyevent(viewgroup.java:1495) @ com.android.internal.policy.impl.phonewindow$decorview.superdispatchkeyevent(phonewindow.java:2361) @ com.android.internal.policy.impl.phonewindow.superdispatchkeyevent(phonewindow.java:1709) @ android.app.activity.dispatchkeyevent(activity.java:2702) @ android.support.v7.app.appcompatactivity.dispatchkeyevent(appcompatactivity.java:541) @ android.support.v7.view.windowcallbackwrapper.dispatchkeyevent(windowcallbackwrapper.java:59) @ android.support.v7.app.appcompatdelegateimplbase$appcompatwindowcallbackbase.dispatchkeyevent(appcompatdelegateimplbase.java:319) @ com.android.internal.policy.impl.phonewindow$decorview.dispatchkeyevent(phonewindow.java:2276) @ android.view.viewrootimpl$viewpostimeinputstage.processkeyevent(viewrootimpl.java:4020) @ android.view.viewrootimpl$viewpostimeinputstage.onprocess(viewrootimpl.java:3982) @ android.view.viewrootimpl$inputstage.deliver(viewrootimpl.java:3544) @ android.view.viewrootimpl$inputstage.ondelivertonext(viewrootimpl.java:3597) @ android.view.viewrootimpl$inputstage.forward(viewrootimpl.java:3563) @ android.view.viewrootimpl$asyncinputstage.forward(viewrootimpl.java:3680) @ android.view.viewrootimpl$inputstage.apply(viewrootimpl.java:3571) @ android.view.viewrootimpl$asyncinputstage.apply(viewrootimpl.java:3737) @ android.view.viewrootimpl$inputstage.deliver(viewrootimpl.java:3544) @ android.view.viewrootimpl$inputstage.ondelivertonext(viewrootimpl.java:3597) @ android.view.viewrootimpl$inputstage.forward(viewrootimpl.java:3563) @ android.view.viewrootimpl$inputstage.apply(viewrootimpl.java:3571) @ android.view.viewrootimpl$inputstage.deliver(viewrootimpl.java:3544) @ android.view.viewrootimpl$inputstage.ondelivertonext(viewrootimpl.java:3597) @ android.view.viewrootimpl$inputstage.forward(viewrootimpl.java:3563) @ android.view.viewrootimpl$asyncinputstage.forward(viewrootimpl.java:3713) @ android.view.viewrootimpl$imeinputstage.onfinishedinputevent(viewrootimpl.java:3874) @ android.view.inputmethod.inputmethodmanager$pendingevent.run(inputmethodmanager.java:2208) @ android.view.inputmethod.inputmethodmanager.invokefinishedinputeventcallback(inputmethodmanager.java:1849) @ android.view.inputmethod.inputmethodmanager.finishedinputevent(inputmethodmanager.java:1840) @ android.view.inputmethod.inputmethodmanager$imeinputeventsender.oninputeventfinished(inputmethodmanager.java:2185) @ android.view.inputeventsender.dispatchinputeventfinished