java - How to display the value of a HashMap key when user clicks autocom -

i'm new android development , java programming. in code (shown below), when user clicks search button, value of key displayed in displayfield textview. want value displayed when user clicks (touches) item on autocompletetextview dropdown items, without needing click search button.

import java.util.hashmap; import java.util.map; import android.content.context; import android.os.bundle; import android.support.v7.app.actionbaractivity; import android.view.view; import android.view.inputmethod.inputmethodmanager; import android.widget.arrayadapter; import android.widget.autocompletetextview; import android.widget.button; import android.widget.edittext; import android.widget.textview;  public class mainactivity extends actionbaractivity  {         map<string, string> map = new hashmap<string, string>();      private edittext autocomplete_searchfield;     private textview displayfield;     string note;      @override     protected  void oncreate(bundle savedinstancestate) {      super.oncreate(savedinstancestate);     setcontentview(r.layout.activity_main);     autocomplete_searchfield = (autocompletetextview) findviewbyid(r.id.autocomplete_searchfield);      // reference autocompletetextview in layout     autocompletetextview textview = (autocompletetextview) findviewbyid(r.id.autocomplete_searchfield);      // gets string array     string[] music_note = getresources().getstringarray(r.array.music_notes_array);      // creates adapter , set autocompletetextview      arrayadapter<string> adapter = new arrayadapter<string>(this, android.r.layout.simple_list_item_1, musicnote);     textview.setadapter(adapter);      displayfield = (textview) findviewbyid(r.id.displayfield);     button button = (button)findviewbyid(r.id.button); // want remove button     button.setonclicklistener(new view.onclicklistener() {      @override     public void onclick(view v) {          string note = autocomplete_searchfield.gettext().tostring();             displayfield.settext(map.get(note));       map.put("doe", "a deer, female deer");     map.put("ray", "a drop of golden sun"); } 

i didn't understand why needed autocomplete_searchfield in code, anyway, if understood need remove button.setonclicklistener , add following code:

textview.setonitemclicklistener(new adapterview.onitemclicklistener() {      @override     public void onitemclick(adapterview<?> adapterview, view view, int position, long id) {          displayfield.settext(map.get(adapterview.getitematposition(position).tostring()));      }  });