在Google地图API v3中长时间添加标记

Question

如何在Google地图API v3中针对android长按添加标记？在Stack Overflow本身有答案，但它们是针对Google Maps API v2的。

public class advertiserMap extends FragmentActivity implements OnMapReadyCallback { 

private GoogleMap mMap; 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_advertiser_map); 
    // Obtain the SupportMapFragment and get notified when the map is ready to be used. 
    SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager() 
      .findFragmentById(R.id.map); 
    mapFragment.getMapAsync(this); 
} 

//for searching for a location 
public void onMapSearch(View view) { 
    EditText locationSearch = (EditText) findViewById(R.id.editText); 
    String location = locationSearch.getText().toString(); 
    List<Address> addressList = null; 

    if (location != null || !location.equals("")) { 
     Geocoder geocoder = new Geocoder(this); 
     try { 
      addressList = geocoder.getFromLocationName(location, 1); 

     } catch (IOException e) { 
      e.printStackTrace(); 
     } 
     Address address = addressList.get(0); 
     LatLng latLng = new LatLng(address.getLatitude(), address.getLongitude()); 
     mMap.animateCamera(CameraUpdateFactory.newLatLng(latLng)); 
    } 
} 

@Override 
public void onMapReady(GoogleMap googleMap) { 
    mMap = googleMap; 

    // Add a marker in Sydney and move the camera 
    LatLng sydney = new LatLng(-34, 151); 
    mMap.addMarker(new MarkerOptions().position(sydney).title("Marker in Sydney")); 
    mMap.moveCamera(CameraUpdateFactory.newLatLng(sydney)); 
} 

}

Answer 1

由于@tyczj指出，有一个为Android的谷歌地图API V3没有，所以你可能正在使用V2。

这就是说，要完成你想要的，请在你的mMap对象中调用setOnMapLongClickListener，然后在MapLongClick中根据需要添加标记。你应该在onMapReady方法做到这一点：

@Override 
public void onMapReady(GoogleMap googleMap) { 

    ... 

    mMap.setOnMapLongClickListener(new GoogleMap.OnMapLongClickListener() { 
     @Override 
     public void onMapLongClick(LatLng latLng) { 
      googleMap.addMarker(new MarkerOptions() 
        .position(latLng) 
        .title("Your marker title") 
        .snippet("Your marker snippet")); 
     } 
    }); 
} 

//编辑：

如果你想保持目前在同一时间只有一个标志，你应该宣布在全球经济活动的范围的标记，然后在onMapLongClick，如果标志已经存在，而不是创建一个新的标记，只需更新它的位置：

public class advertiserMap extends FragmentActivity implements OnMapReadyCallback { 

    // Declare marker globally 
    Marker myMarker; 

    ... 

    @Override 
    public void onMapReady(GoogleMap googleMap) { 

     ... 

     mMap.setOnMapLongClickListener(new GoogleMap.OnMapLongClickListener() { 
      @Override 
      public void onMapLongClick(LatLng latLng) { 

       // First check if myMarker is null 
       if (myMarker == null) { 

        // Marker was not set yet. Add marker: 
        myMarker = googleMap.addMarker(new MarkerOptions() 
         .position(latLng) 
         .title("Your marker title") 
         .snippet("Your marker snippet")); 

       } else { 

        // Marker already exists, just update it's position 
        myMarker.setPosition(latLng); 

       } 
      } 
     }); 
    } 
} 

如果这样做，记得要经常检查，如果你的标志是不是在你的代码操作之前NULL。