如何在主要活动中添加片段

Question

I want to add a fragment called today in my main activity But im using a drawer in this activity

public class MainActivity extends AppCompatActivity
        implements NavigationView.OnNavigationItemSelectedListener, ActionBar.TabListener{

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);

        DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
        ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
            this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
        drawer.setDrawerListener(toggle);
        toggle.syncState();

        NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
        navigationView.setNavigationItemSelectedListener(this);
        //codi

    }

Answer 1

Like mentioned in the comments, you should just read a tutorial about that. Put that in the oncreate() method

 getFragmentManager().beginTransaction()
                .add(R.id.container, yourFragment()                            
                .commit();

The first paramter of the add() method is the ViewGroup in the activities XML. where the Fragment should be placed (R.layout.activity_main in your case).