title: How to use a Google Map in a NavigationDrawer?
body: <p>I am relatively new to Coding but please bear with me. I am trying to put a Google Map in a navigation drawer. I figured the best way is to use fragments but despite my various attempts I keep getting this error: "Error:(35, 62) error: incompatible types: MapsActivity cannot be converted to Fragment".</p>
  
  <p>I have two Activities
  1. MainActiyity: where there's an error.
  2. MapsActivity: which is the default Activity when choosing to create google maps app on Android studio new project creation.</p>
  
  <pre><code>import android.os.Bundle;
  import android.support.design.widget.FloatingActionButton;
  import android.support.design.widget.Snackbar;
  import android.view.View;
  import android.support.design.widget.NavigationView;
  import android.support.v4.view.GravityCompat;
  import android.support.v4.widget.DrawerLayout;
  import android.support.v7.app.ActionBarDrawerToggle;
  import android.support.v7.app.AppCompatActivity;
  import android.support.v7.widget.Toolbar;
  import android.view.Menu;
  import android.view.MenuItem;
  
  import android.support.v4.app.Fragment;
  import android.support.v4.app.FragmentManager;
  import android.support.v4.app.FragmentTransaction;
  
  import android.support.v4.app.FragmentActivity;
  
  
  public class MainActivity extends AppCompatActivity
          implements NavigationView.OnNavigationItemSelectedListener {    
  
  NavigationView navigationView = null;
  Toolbar toolbar = null;
  
  @Override
  protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.activity_main);
  
      // Set to start with fragment
      MapsActivity fragment = new MapsActivity();
      android.support.v4.app.FragmentTransaction fragmentTransaction =
              getSupportFragmentManager().beginTransaction();
      fragmentTransaction.replace(R.id.fragment_container, fragment);
      fragmentTransaction.commit();
  
  
      toolbar = (Toolbar) findViewById(R.id.toolbar);
      setSupportActionBar(toolbar);
  
      FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
      fab.setOnClickListener(new View.OnClickListener() {
          @Override
          public void onClick(View view) {
              Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
                      .setAction("Action", null).show();
          }
      });
  
      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) findViewById(R.id.nav_view);
      navigationView.setNavigationItemSelectedListener(this);
  }
  
  @Override
  public void onBackPressed() {
      DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
      if (drawer.isDrawerOpen(GravityCompat.START)) {
          drawer.closeDrawer(GravityCompat.START);
      } else {
          super.onBackPressed();
      }
  }
  
  @Override
  public boolean onCreateOptionsMenu(Menu menu) {
      // Inflate the menu; this adds items to the action bar if it is present.
      getMenuInflater().inflate(R.menu.main, menu);
      return true;
  }
  
  @Override
  public boolean onOptionsItemSelected(MenuItem item) {
      // Handle action bar item clicks here. The action bar will
      // automatically handle clicks on the Home/Up button, so long
      // as you specify a parent activity in AndroidManifest.xml.
      int id = item.getItemId();
      return super.onOptionsItemSelected(item);
  }
  
  @SuppressWarnings("StatementWithEmptyBody")
  @Override
  public boolean onNavigationItemSelected(MenuItem item) {
      // Handle navigation view item clicks here.
      int id = item.getItemId();
  
      if (id == R.id.nav_building) {
          MapsActivity fragment = new MapsActivity();
          android.support.v4.app.FragmentTransaction fragmentTransaction =
                  getSupportFragmentManager().beginTransaction();
          fragmentTransaction.replace(R.id.fragment_container, fragment);
          fragmentTransaction.commit();
  
      } else if (id == R.id.nav_map) {
  
      } else if (id == R.id.nav_timetable) {
  
      } else if (id == R.id.nav_noticeboard) {
  
      } else if (id == R.id.nav_settings) {
  
      } else if (id == R.id.nav_placeholder) {
  
      }
  
      DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
      drawer.closeDrawer(GravityCompat.START);
      return true;
  }
  }
  </code></pre>
  
  <p>Also, the word 'fragment' in  fragmentTransaction.replace(R.id.fragment_container, fragment);
  is underlined red.
  I have tried to find different tutorials and guides but nothing solved my issue.</p>