android.support.design.widget.TabLayout not showing tabs -

build.gradle

 dependencies {   compile filetree(dir: 'libs', include: ['*.jar'])   compile 'com.android.support:design:22.2.0'   compile 'com.android.support:support-v4:22.2.0' } 

activity_main.xml

<relativelayout       xmlns:android="http://schemas.android.com/apk/res/android"  xmlns:tools="http://schemas.android.com/tools"  android:layout_width="match_parent"  android:layout_height="match_parent"  tools:context=".mainactivity">    <android.support.design.widget.appbarlayout     android:id="@+id/abl_top"     android:layout_width="match_parent"     android:layout_height="?attr/actionbarsize">      <android.support.v7.widget.toolbar         android:id="@+id/toolbar"         android:layout_width="match_parent"         android:layout_height="wrap_content"         android:background="?attr/colorprimary" />      <android.support.design.widget.tablayout         android:id="@+id/tab_layout"         android:layout_width="match_parent"         android:layout_height="wrap_content" />   </android.support.design.widget.appbarlayout>    <android.support.v4.view.viewpager     android:id="@+id/pager"     android:layout_width="match_parent"     android:layout_height="match_parent"     android:layout_below="@+id/abl_top" /> </relativelayout> 

mainactivity.java

 import android.os.bundle; import android.support.design.widget.tablayout; import android.support.v4.app.fragment; import android.support.v4.app.fragmentmanager; import android.support.v4.app.fragmentpageradapter; import android.support.v4.view.viewpager; import android.support.v7.app.appcompatactivity; import android.support.v7.widget.toolbar; import android.view.menu; import android.view.menuitem;  public class mainactivity extends appcompatactivity {      @override     protected void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         setcontentview(r.layout.activity_main);          toolbar toolbar = (toolbar) findviewbyid(r.id.toolbar);         tablayout tl = (tablayout) findviewbyid(r.id.tab_layout);         viewpager viewpager = (viewpager) findviewbyid(r.id.pager);          if (toolbar != null) {             setsupportactionbar(toolbar);         }          //tl.addtab(tl.newtab().settext("tab 1"));         //tl.addtab(tl.newtab().settext("tab 2"));          viewpager.setadapter(new mypageradapter(getsupportfragmentmanager()));         tl.setupwithviewpager(viewpager);     }      public class mypageradapter extends fragmentpageradapter {         public mypageradapter(fragmentmanager fm) { super(fm); }         @override         public fragment getitem(int position) {             switch (position) {                 case 0: return new fragmentone();                 case 1: return new fragmentone();                 default: return null;             }         }         @override         public int getcount() { return 2; }         @override         public charsequence getpagetitle(int position) {             switch (position) {                 case 0: return "first tab";                 case 1: return "second tab";                 default: return "not found";             }         }     } } 

fragmentone.java

 import android.os.bundle; import android.support.v4.app.fragment; import android.util.log; import android.view.layoutinflater; import android.view.view; import android.view.viewgroup; import android.widget.arrayadapter; import android.widget.listview;  public class fragmentone extends fragment {     private final string tag = getclass().getsimplename();     private static final string murl = "http://goanuj.freeshell.org/txt2lrn/bollywood/box_office.json";      @override     public view oncreateview(layoutinflater inflater, viewgroup container, bundle savedinstancestate) {         log.d(tag, "[oncreateview]");         final view v = inflater.inflate(r.layout.fragment_one, container, false);         // setup listview         listview lv = (listview) v.findviewbyid(r.id.lv_items);          // defined array values show in listview         string[] values = new string[] { "apple", "banana", "cherry", "dog", "earth",                 "farther", "grape", "horseradish", "ice cream", "janitor", "kangaroo","lemon"         };          arrayadapter adapter = new arrayadapter(v.getcontext(),                 android.r.layout.simple_list_item_1, android.r.id.text1, values);         lv.setadapter(adapter);          return v;     }  } 

the mistake in activity_main.xml

android:layout_height="?attr/actionbarsize" <!-- wrong --> 

the best way have found fix far is

android:layout_height="wrap_content" <!-- right -->