Tablayout with Icons on Android

mTabLayout.setupWithViewPager(mViewPager);
for (int i = 0; i < mTabLayout.getTabCount(); i++) {
  mTabLayout.getTabAt(i).setIcon(R.drawable.your_icon);
}

or

<android.support.design.widget.TabLayout
         app:tabTextColor="@color/gray"
         app:tabMode="fixed"
         app:tabBackground="@color/red"
         app:tabIndicatorHeight="4dp"
         app:tabIndicatorColor="@color/purple"
         app:tabPadding="2dp"
         app:tabSelectedTextColor="@color/white"
         app:tabMinWidth="64dp"
         android:layout_height="wrap_content"
         android:layout_width="match_parent">

     <!--add height and width to TabItem -->
     <android.support.design.widget.TabItem 
             android:text="@string/tab_text"/>

     <android.support.design.widget.TabItem
             android:icon="@drawable/ic_android"/>

 </android.support.design.widget.TabLayout>

References
https://stackoverflow.com/questions/30892545/tablayout-with-icons-only