title: How to move a map under a marker?
body: <p>Suppose that we have a centered marker on the map, when we move the map with our fingers we can see that marker would no longer displayed when you got out of bounds of the area. So how can we make a marker that would remain always on the center of the map although we move the map anywhere? There is an app named UBER and they provide this feature, you don't drag and drop the marker you just move the map and the marker remained it's position.</p>
  
  <p>Here is a screenshot:</p>
  
  <p><img src="https://i.stack.imgur.com/VAKgxm.jpg" alt="Uber Map Marker"></p>
  
  <p>As you can see green marker is on the center of screen when we move the map it remained its place but shows the new position when the user stop moving the map. How can we do like this?</p>
  
  <p>I have a code that shows the address when you drag&amp;drop the marker, how about displaying the address again but this time not by dragging, moving the map? Hope you can understand any ideas would be great.</p>
  
  <pre><code>public class MainActivity extends AbstractMapActivity implements
      OnNavigationListener, OnInfoWindowClickListener,
      OnMarkerDragListener {
    private static final String STATE_NAV="nav";
    private static final int[] MAP_TYPE_NAMES= { R.string.normal,
      R.string.hybrid, R.string.satellite, R.string.terrain };
    private static final int[] MAP_TYPES= { GoogleMap.MAP_TYPE_NORMAL,
      GoogleMap.MAP_TYPE_HYBRID, GoogleMap.MAP_TYPE_SATELLITE,
      GoogleMap.MAP_TYPE_TERRAIN };
  private GoogleMap map=null;
  String filterAddress = "";
  Marker marker;
  
  @Override
  protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
  
      if (readyToGo()) {
          setContentView(R.layout.activity_main);
  
          SupportMapFragment mapFrag=
              (SupportMapFragment)getSupportFragmentManager().findFragmentById(R.id.map);
  
          mapFrag.setRetainInstance(true);
          initListNav();
  
          map=mapFrag.getMap();
  
          if (savedInstanceState == null) {
              CameraUpdate center=
                  CameraUpdateFactory.newLatLng(new LatLng(
                          41.003739,
                          28.999572));
              CameraUpdate zoom=CameraUpdateFactory.zoomTo(10);
  
              map.moveCamera(center);
              map.animateCamera(zoom);
  
              addMarker(map, 41.003739, 28.999572, R.string.un, R.string.united_nations);
  
                map.setInfoWindowAdapter(new PopupAdapter(getLayoutInflater()));
                map.setOnInfoWindowClickListener(this);
                map.setOnMarkerDragListener(this);
          }
      }
  }
  
  @Override
  public boolean onNavigationItemSelected(int itemPosition, long itemId) {
      map.setMapType(MAP_TYPES[itemPosition]);
  
      return(true);
  }
  
  @Override
  public void onSaveInstanceState(Bundle savedInstanceState) {
      super.onSaveInstanceState(savedInstanceState);
  
      savedInstanceState.putInt(STATE_NAV,
              getSupportActionBar().getSelectedNavigationIndex());
  }
  
  @Override
  public void onRestoreInstanceState(Bundle savedInstanceState) {
      super.onRestoreInstanceState(savedInstanceState);
  getSupportActionBar().setSelectedNavigationItem(savedInstanceState.getInt(STATE_NAV));
  }
  
  @Override
  public void onInfoWindowClick(Marker marker) {
      Toast.makeText(this, marker.getTitle(), Toast.LENGTH_LONG).show();
  }
  
  @Override
  public void onMarkerDragStart(Marker marker) {
      LatLng position=marker.getPosition();
  
      Log.d(getClass().getSimpleName(), String.format("Drag from %f:%f",
              position.latitude,
              position.longitude));
  }
  
  @Override
  public void onMarkerDrag(Marker marker) {
      LatLng position=marker.getPosition();
  
      Log.d(getClass().getSimpleName(),
              String.format("Dragging to %f:%f", position.latitude,
                      position.longitude));
  }
  
  @Override
  public void onMarkerDragEnd(Marker marker) {
      LatLng position=marker.getPosition();
  
      String filterAddress = "";
      Geocoder geoCoder = new Geocoder(
              getBaseContext(), Locale.getDefault());
      try {
          List&lt;Address&gt; addresses = geoCoder.getFromLocation(
                  position.latitude, 
                  position.longitude, 1);
  
          if (addresses.size() &gt; 0) {
              for (int index = 0; 
              index &lt; addresses.get(0).getMaxAddressLineIndex(); index++)
                  filterAddress += addresses.get(0).getAddressLine(index) + " ";
          }
      }catch (IOException ex) {        
          ex.printStackTrace();
      }catch (Exception e2) {
          // TODO: handle exception
          e2.printStackTrace();
      } 
      Log.d(getClass().getSimpleName(),
              String.format("Dragging to %f:%f", position.latitude,
                      position.longitude));
      TextView myTextView = (TextView) findViewById(R.id.test);
  
      myTextView.setText("Address is: " + filterAddress);
  
  }
  
  private void initListNav() {
      ArrayList&lt;String&gt; items=new ArrayList&lt;String&gt;();
      ArrayAdapter&lt;String&gt; nav=null;
      ActionBar bar=getSupportActionBar();
  
      for (int type : MAP_TYPE_NAMES) {
          items.add(getString(type));
      }
  
      if (Build.VERSION.SDK_INT &gt;= Build.VERSION_CODES.ICE_CREAM_SANDWICH) {
          nav=
              new ArrayAdapter&lt;String&gt;(
                      bar.getThemedContext(),
                      android.R.layout.simple_spinner_item,
                      items);
      }
      else {
          nav=
              new ArrayAdapter&lt;String&gt;(
                      this,
                      android.R.layout.simple_spinner_item,
                      items);
      }
  
      nav.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
      bar.setNavigationMode(ActionBar.NAVIGATION_MODE_LIST);
      bar.setListNavigationCallbacks(nav, this);
  }
  
  private void addMarker(GoogleMap map, double lat, double lon,
          int title, int snippet)
  
  {
      map.addMarker(new MarkerOptions().position(new LatLng(lat, lon))
              .icon(BitmapDescriptorFactory.fromResource(R.drawable.pin))
  
              .draggable(true));
  }
      }
  </code></pre>
  
  <p>Here is the xml</p>
  
  <pre><code>&lt;RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:id="@+id/layout1"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  android:layout_below="@+id/img_header" &gt;
  
  &lt;fragment
      android:id="@+id/map"
      android:layout_width="match_parent"
      android:layout_height="match_parent"
      class="com.google.android.gms.maps.SupportMapFragment" /&gt;
  
  &lt;TextView
      android:id="@+id/test"
      android:layout_width="match_parent"
      android:layout_height="90dp"
      android:layout_alignParentRight="true"
      android:text="Address : "
      android:textColor="#FF0000"
      android:textSize="22sp" /&gt;
  &lt;/RelativeLayout&gt;
  </code></pre>