android - RecyclerView not displaying without error -

i have started android development , till had no problem tried insert recyclerview layout , fine there no error recyclerview not displaying. code seems right me.

here's code:

mainactivity.java :

public class mainactivity extends appcompatactivity {  private toolbar toolbar; private rvadapter adapter;  private recyclerview recyclerview;  @override protected void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);     setcontentview(r.layout.activity_main);      toolbar = (toolbar) findviewbyid(r.id.app_bar);     setsupportactionbar(toolbar);      getsupportactionbar().setdisplayshowhomeenabled(true);     navigationdrawerfragment drawerfragment = (navigationdrawerfragment) getsupportfragmentmanager().findfragmentbyid(r.id.fragment_navigation_drawer);     drawerfragment.setup(r.id.fragment_navigation_drawer, (drawerlayout) findviewbyid(r.id.drawer_layout), (toolbar) findviewbyid(r.id.app_bar));      recyclerview = (recyclerview) findviewbyid(r.id.goallist);     recyclerview.sethasfixedsize(true);     adapter = new rvadapter(getapplication(), getdata());     recyclerview.setadapter(adapter);     recyclerview.setlayoutmanager(new linearlayoutmanager(getapplication()));  }  public static list<rvdata> getdata() {     list<rvdata> data = new arraylist<>();     string[] titles = {"dummy1", "dummy2", "dummy3"};      (int = 0; < titles.length; i++) {         rvdata current = new rvdata();         current.goaltitle = titles[i];         data.add(current);     }     return data; }  public void newgoal(view view) {     intent intent = new intent(mainactivity.this, newgoal.class);     startactivity(intent); }  @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); } } 

activity_main.xml:

<relativelayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" style="@style/defaultlayoutstyle" tools:context=".mainactivity">  <include     android:id="@+id/app_bar"     layout="@layout/app_bar" />   <android.support.design.widget.floatingactionbutton     android:id="@+id/fab"     style="@style/fabstyle"     android:onclick="newgoal"     android:src="@drawable/ic_add"     app:borderwidth="0dp" />  <android.support.v4.widget.drawerlayout     android:id="@+id/drawer_layout"     android:layout_width="match_parent"     android:layout_height="match_parent"     android:layout_below="@id/app_bar">      <relativelayout         android:layout_width="wrap_content"         android:layout_height="wrap_content">          <android.support.v7.widget.recyclerview             android:id="@+id/goallist"             android:layout_width="match_parent"             android:layout_height="wrap_content"             android:layout_gravity="center"></android.support.v7.widget.recyclerview>     </relativelayout>      <fragment         android:id="@+id/fragment_navigation_drawer"         android:name="com.kellarapps.zeal.navigationdrawerfragment"         android:layout_width="@dimen/nav_drawer_width"         android:layout_height="match_parent"         android:layout_gravity="start"         app:layout="@layout/fragment_navigation_drawer"         tools:layout="@layout/fragment_navigation_drawer" />  </android.support.v4.widget.drawerlayout> </relativelayout> 

goal_row.xml

<?xml version="1.0" encoding="utf-8"?> <linearlayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="horizontal">  <checkbox     android:id="@+id/goalrowcb"     android:layout_width="wrap_content"     android:layout_height="wrap_content" />  <textview     android:id="@+id/goalrowtitle"     android:textsize="17sp"     android:clickable="true"     android:layout_width="match_parent"     android:gravity="center_horizontal"     android:layout_height="wrap_content"     android:textcolor="@color/textcolor"     android:text="@string/dummytxt"/>  </linearlayout> 

rvdata.java:

public class rvdata {     checkbox checkbox;     string goaltitle;  } 

rvadapter.java

public class rvadapter extends recyclerview.adapter<rvadapter.myviewholder> {  list<rvdata> data = collections.emptylist(); private layoutinflater inflater;  public rvadapter(context context, list<rvdata> cdata) {     inflater = layoutinflater.from(context);     this.data = cdata; }  @override public myviewholder oncreateviewholder(viewgroup viewgroup, int i) {     view view = inflater.inflate(r.layout.goal_row, viewgroup, false);     myviewholder holder = new myviewholder(view);     return holder; }  @override public void onbindviewholder(myviewholder viewholder, int position) {     rvdata current = data.get(position);     viewholder.title.settext(current.goaltitle);  }  @override public int getitemcount() {     return 0; }  class myviewholder extends recyclerview.viewholder {     @bind(r.id.goalrowtitle)     textview title;     @bind(r.id.goalrowcb)     checkbox checkbox;      public myviewholder(view itemview) {         super(itemview);         title = (textview) itemview;         checkbox = (checkbox) itemview;         }     } } 

there no error there no recyclerview.

one thing stands out, item count hard coded return 0. should return data size in function this:

@override public int getitemcount() {     return data.size(); }