android - Icons in TabLayout -

i have simple appcompatactivity 1 simple toolbar (android.support.v7.widget.toolbar), 1 design-library tablayout , 1 viewpager.

now have in case 4 fragments inside viewpager , can swiped sides. works fine. use mtablayout.setupwithviewpager(mviewpager);, icons disappear can tab on empty spaces works fine. if remove line, icons visible again, "swipe" works if tab icon, nothing happens.

my code

mainactivity

public class mainactivity extends appcompatactivity {      private toolbar mtoolbar;     private tablayout mtablayout;     private viewpager mviewpager;     private viewpageradapter madapter;       @override     protected void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         setcontentview(r.layout.activity_main);          inittoolbar();         inittablayout();         initviewpager();          mtablayout.setupwithviewpager(mviewpager);//here code above         mviewpager.addonpagechangelistener(new tablayout.tablayoutonpagechangelistener(mtablayout));      }      private void inittoolbar() {         mtoolbar = (toolbar) findviewbyid(r.id.app_bar);         setsupportactionbar(mtoolbar);         getsupportactionbar().setdisplayhomeasupenabled(false);      }      private void inittablayout() {         mtablayout = (tablayout) findviewbyid(r.id.tablayout);         mtablayout.addtab(mtablayout.newtab().seticon(r.drawable.ic_fire_white));         mtablayout.addtab(mtablayout.newtab().seticon(r.drawable.ic_apps_white));         mtablayout.addtab(mtablayout.newtab().seticon(r.drawable.ic_account_plus_white));         mtablayout.addtab(mtablayout.newtab().seticon(r.drawable.ic_help_white));      }      private void initviewpager() {         madapter = new viewpageradapter(getsupportfragmentmanager(), mainactivity.this);         mviewpager = (viewpager) findviewbyid(r.id.viewpager);         mviewpager.setadapter(madapter);      }      //menue stuff  }  //viewpageradapter class viewpageradapter extends fragmentstatepageradapter {      public static final int tabs_count = 4;     private context context;      public viewpageradapter(fragmentmanager fm, context context) {         super(fm);         this.context = context;     }      @override     public fragment getitem(int position) {         switch (position) {             case 0: return new homefragment1();             case 1: return new homefragment2();             case 2: return new homefragment3();             case 3: return new homefragment4();         }         return null;     }      @override     public int getcount() {         return tabs_count;     }  } 

activity_main.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"     xmlns:app="http://schemas.android.com/apk/res-auto"     android:orientation="vertical">      <include         android:id="@+id/app_bar"         layout="@layout/app_bar" />      <android.support.design.widget.tablayout         android:id="@+id/tablayout"         android:layout_width="match_parent"         android:layout_height="wrap_content"         android:background="@color/primary"         app:tabgravity="fill"         app:tabmode="fixed"         app:theme="@style/themeoverlay.appcompat.dark.actionbar" />      <android.support.v4.view.viewpager         android:id="@+id/viewpager"         android:layout_width="match_parent"         android:layout_height="0dp"         android:layout_weight="1" />  </linearlayout> 

setupwithviewpager() instantiate tab have title provided viewpager.adapter. of course can override method this:

public class iconictablayout extends tablayout {      private tabviewprovider mtabviewprovider;      public interface tabviewprovider {         tab newtabinstance(int tabposition);     }      public iconictablayout(context context) {         super(context);     }      public iconictablayout(context context, attributeset attrs) {         super(context, attrs);     }      public iconictablayout(context context, attributeset attrs, int defstyleattr) {         super(context, attrs, defstyleattr);     }      public void settabprovider(tabviewprovider provider){         mtabviewprovider = provider;     }      @override     public void setupwithviewpager(viewpager viewpager) {         pageradapter adapter = viewpager.getadapter();         if (adapter == null) {             throw new illegalargumentexception("viewpager not have pageradapter set");         } else {             this.settabsfrompageradapter(adapter);             viewpager.addonpagechangelistener(new tablayout.tablayoutonpagechangelistener(this));             this.setontabselectedlistener(new tablayout.viewpagerontabselectedlistener(viewpager));         }      }      @override     public void settabsfrompageradapter(pageradapter adapter) {         removealltabs();         mtabviewprovider = mtabviewprovider == null && adapter instanceof tabviewprovider? (tabviewprovider)adapter : null;   if(mtabviewprovider == null){            super.settabsfrompageradapter(adapter);     }else{         (int = 0, count = adapter.getcount(); < count; ++i) {             this.addtab(mtabviewprovider.newtabinstance(i));         }      }    } } 

usage:

 miconictablayout.settabprovider(new tabviewprovider() {         @override         public tab newtabinstance(int tabposition) {             return miconictablayout.newtab().seticon(icons[position]);         }     });     miconictablayout.setupwithviewpager(mviewpager); 

or

class viewpageradapter extends fragmentstatepageradapter implements tabviewprovider{     public void settablayout(tablayout t){       mtablayout = t;    }   //...      @override     public tab newtabinstance(int position) {                 return mtablayout.newtab().seticon(icons[position]);             }  } 

note: make sure first call settabprovider method or pageradapter implement tabviewprovider, otherwise call default implementation.