public class MainActivity extends AppCompatActivity implements View.OnClickListener {


Button btnLogin;
EditText txtUser, txtPass;

@Override
public void onClick(View view) {
    Intent intent = new Intent(getApplicationContext(),searchtabs.class);
    startActivity(intent);
}

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

    txtUser = (EditText) findViewById(R.id.txtUser);
    txtPass = (EditText) findViewById(R.id.txtPass);
    btnLogin = (Button) findViewById(R.id.btnInicio);

    btnLogin.setOnClickListener(this);

 }
}

public class searchtabs extends AppCompatActivity {

private TabLayout tabLayout;
private AppBarLayout appBarLayout;
private ViewPager viewPager;

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

    tabLayout = (TabLayout) findViewById(R.id.tablayout_id);
    appBarLayout = (AppBarLayout) findViewById(R.id.appbarid);
    viewPager = (ViewPager) findViewById(R.id.viewpager_id);

    ViewPagerAdapter adapter = new ViewPagerAdapter(getSupportFragmentManager());
    // Añadiendo fragments
    adapter.AddFragment(new FragmentBuscar(), "Buscar");
    adapter.AddFragment(new FragmentPromo(), "Promociones");
    adapter.AddFragment(new FragmentPerfil(), "Perfil");
    // adaptador
    viewPager.setAdapter(adapter);
    tabLayout.setupWithViewPager(viewPager);
 }
}