java - Android - ArrayList and RecycleView.Adapter -

i have got chordslistactivity looks this:

public class chordslistactivity extends activity { private recyclerview chordslist; private recyclerview.layoutmanager listlayoutmanager;  private arraylist<accordo> getchords() {     arraylist<accordo> chords = new arraylist<>();      accordo a=new accordo();     a.setname("do maggiore");     a.setnote("do, mi, sol");     a.setimage(r.drawable.do_maggiore);     chords.add(a);      a=new accordo();     a.setname("do 5");     a.setnote("na, na, na");     a.setimage(r.drawable.do5);     chords.add(a);      return chords; }  @override protected void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);     setcontentview(r.layout.activity_chords_list);      chordslist = (recyclerview) findviewbyid(r.id.chords_recycler);      //use linear layout manager     listlayoutmanager = new linearlayoutmanager(this);     chordslist.setlayoutmanager(listlayoutmanager);       chordslistadapter adapter = new chordslistadapter(this, getchords());      /** start searchactivity when imagebutton pressed */     imagebutton cerca = (imagebutton) findviewbyid(r.id.search);     cerca.setonclicklistener(new view.onclicklistener() {         @override         public void onclick(view v) {             intent intent = new intent(getapplicationcontext(), searchactivity.class);              arraylist<accordo> chords = new arraylist<accordo>();             intent.putextra("chords", chords);               startactivity(intent);         }     });  } } 

there error on line:

chordslistadapter adapter = new chordslistadapter(this, getchords()); 

this error:

error:(126, 38) error: constructor chordslistadapter in class chordslistadapter cannot applied given types; required: arraylist found: chordslistactivity,arraylist reason: actual , formal argument lists differ in length

and chordslistadapter:

public class chordslistadapter extends recyclerview.adapter<chordslistadapter.myviewholder> { private arraylist<accordo> chordslist;  public class myviewholder extends recyclerview.viewholder {     public textview nome, note;     public imageview immagine;      public myviewholder(view view) {         super(view);         nome = (textview) view.findviewbyid(r.id.nome);         note = (textview) view.findviewbyid(r.id.note);         immagine = (imageview) view.findviewbyid(r.id.immagine_accordo);     } }  public chordslistadapter(arraylist<accordo> chordslist) {     this.chordslist = chordslist; }  @override public myviewholder oncreateviewholder(viewgroup parent, int viewtype) {     view itemview = layoutinflater.from(parent.getcontext()).inflate(r.layout.row, parent, false);      return new myviewholder(itemview); }  @override public void onbindviewholder(myviewholder holder, int position){     accordo chord = chordslist.get(position);     holder.nome.settext(chord.getnome());     holder.note.settext(chord.getnote());     holder.immagine.setimageresource(chord.getimage()); }  @override public int getitemcount() {     return chordslist.size(); } } 

could me figure out problem , how fix it?

this line

chordslistadapter adapter = new chordslistadapter(this, getchords()); 

is call constructor of chordslistadapter, looks in chordslistadapter.class:

public chordslistadapter(arraylist<accordo> chordslist) {     this.chordslist = chordslist;  } 

either you'll need change constructor accept context or activity.

public chordslistadapter(context context, arraylist<accordo> chordslist) {     this.chordslist = chordslist;  } 

or can delete first parameter in call:

chordslistadapter adapter = new chordslistadapter(getchords());