Android TabLayout onCreate

TabLayout_onCreate.java

@Override
protected void onCreate(Bundle savedInstanceState) {
   super.onCreate(savedInstanceState);
   setContentView(R.layout.activity_main);

   toolbar = (Toolbar) findViewById(R.id.tool_bar);
   setSupportActionBar(toolbar);

   pager = (ViewPager) findViewById(R.id.pager);
   pager.setAdapter(new ViewPagerAdapter(getSupportFragmentManager()));
   tabs = (TabLayout) findViewById(R.id.tabs);
   tabs.setupWithViewPager(pager);
}