如何使用Android中的MarkerOptions显示/绘制位置Google Maps API v2

我在如何显示/绘制地图中的位置时遇到问题。我想在每个特定的位置放一个标记。我创建了sqlite数据库来存储我的数据（MallName，地址，经度和纬度）。一切正常。它从我的sqlite返回值。我使用Log对其进行了测试。请参阅MallMarkers.java如何使用Android中的MarkerOptions显示/绘制位置Google Maps API v2

也许我在使用MarkerOptions时犯了一个错误。请帮帮我。这是我的代码。

类GoogleMapsApiActivity.java

public class GoogleMapsApiActivity extends FragmentActivity implements LocationListener{ 

private ArrayList<MallMarkers> malls = new ArrayList<MallMarkers>(); 
private LocationManager locationManager; 
private GoogleMap googleMap; 
private static final String DEBUG_TAG = "GoogleMapsApiActivity"; 
private Location myLocation = null; 
private UiSettings mapInterface; 
private boolean zoom = true; 
private static final long MIN_DISTANCE_CHANGE_FOR_UPDATES = 10; 
private static final long MIN_TIME_BW_UPDATES = 1000*60*1; 
private DataSource datasource; 
private SQLiteDatabase database; 
@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.map_api); 
    zoom = true; 
    GooglePlayServicesUtil.isGooglePlayServicesAvailable(getApplicationContext()); 
} 
private void setUpMapIfNeeded() { 
    if (googleMap == null) { 
     googleMap = ((SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map)).getMap(); 

     if (googleMap != null) { 
      setUpMapSetings();    
     } 
    } 
} 

private void setUpMapSetings(){   
    SharedPreferences sharedMapSettings = PreferenceManager.getDefaultSharedPreferences(this); 
    String mapViewLayout = sharedMapSettings.getString("map_layer", "Normal"); 
    Boolean mapTraffic = sharedMapSettings.getBoolean("key_mapTraffic", false); 
    Boolean mapCompass = sharedMapSettings.getBoolean("key_mapCompass", true); 
    boolean mapMyLocation = sharedMapSettings.getBoolean("key_mapMyLocation", true); 
    boolean mapButtonZoom = sharedMapSettings.getBoolean("key_mapButtonZoom", true); 
    mapInterface = googleMap.getUiSettings(); 
    //plotMalls(); 
    if(mapViewLayout.equals("Normal")){ 
     googleMap.setMapType(GoogleMap.MAP_TYPE_NORMAL); 
    } 
    else if(mapViewLayout.equals("Hybrid")){ 
     googleMap.setMapType(GoogleMap.MAP_TYPE_HYBRID); 
    } 
    else if(mapViewLayout.equals("Satellite")){ 
     googleMap.setMapType(GoogleMap.MAP_TYPE_SATELLITE); 
    } 
    else if(mapViewLayout.equals("Terrain")){ 
     googleMap.setMapType(GoogleMap.MAP_TYPE_TERRAIN); 
    } 

    googleMap.setTrafficEnabled(mapTraffic); 
    mapInterface.setCompassEnabled(mapCompass); 
    mapInterface.setMyLocationButtonEnabled(mapMyLocation); 
    mapInterface.setZoomControlsEnabled(mapButtonZoom); 

    googleMap.getUiSettings().setAllGesturesEnabled(true); 
    googleMap.setMyLocationEnabled(true); 
} 
//I used cursor to query my data from sqlite (Works fine) 
private void plotLocationMallMapsUI(){ 
    database=openOrCreateDatabase(com.example.sqlite.MySQLiteHelper.DATABASE_NAME, Context.MODE_PRIVATE, null); 
    String sqlcommand = "SELECT MallName, MallStreetAddress, MallCityAddress, MallContactNumber, MallLatitude, MallLongitude FROM mallsinfo"; 
    Cursor cursor = database.rawQuery(sqlcommand, null); 
    malls = new ArrayList<MallMarkers>(); 
    if(cursor.moveToFirst()){  
     do{ 
      MallMarkers markers = new MallMarkers(cursor.getString(0), 
      cursor.getString(1), 
      cursor.getString(2), 
      cursor.getString(3), 
      cursor.getString(4), 
      cursor.getString(5), this); 
      malls.add(markers); 
     }while(cursor.moveToNext());   
    } 
    cursor.close(); 
    database.close(); 
} 

@Override 
public void onRestart() { 
    super.onRestart(); 
    setUpMapSetings(); 
} 
@Override 
public void onResume() { 
    super.onResume(); 
    setUpMapIfNeeded(); 
    plotLocationMallMapsUI(); 

} 
@Override 
public void onPause() { 
    locationManager.removeUpdates(this); 
    super.onPause(); 
} 
@Override 
public void onLocationChanged(Location location) { 
    LatLng latlng = new LatLng(location.getLatitude(), location.getLongitude()); 
    locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE); 
    Criteria criteria = new Criteria(); 
    provider = locationManager.getBestProvider(criteria, false); 
    location = locationManager.getLastKnownLocation(provider); 
    double lat = (double) (location.getLatitude()); 
    double lng = (double) (location.getLongitude()); 
    Log.d(DEBUG_TAG, "Latitude: " + String.valueOf(lat)); 
    Log.d(DEBUG_TAG, "Longitude: " + String.valueOf(lng)); 
} 
@Override 
public void onProviderDisabled(String provider) { 

} 
@Override 
public void onProviderEnabled(String provider) { 

} 
@Override 
public void onStatusChanged(String provider, int status, Bundle extras) { 

}

}

它从源码返回值。我使用Log对其进行了测试。但它不显示情节。请帮帮我。如何使用标记显示它？

类MallMarkers.java

public class MallMarkers { 
private String mMallId = ""; 
private String mMallName = ""; 
private String mMallStreetAddress = ""; 
private String mMallCityAddress = ""; 
private String mMallContactNumber = ""; 
private String mMallLatitude = ""; 
private String mMallLongitude = ""; 
private Context mContext; 
private LatLng mMallCoordinates = null; 
private MarkerOptions mMallMarkerOptions=null; 
private Double mLatitude; 
private Double mLongitude; 
private GoogleMap googlemap; 
public MallMarkers(String mallname, String mallstreetaddress, String mallcityaddress, String mallcontactnumber, String malllatitude, String malllongitude, Context context){ 
    mContext = context; 
    mMallName = mallname; 
    mMallStreetAddress = mallstreetaddress; 
    mMallCityAddress = mallcityaddress; 
    mMallContactNumber = mallcontactnumber; 
    mMallLatitude = malllatitude; 
    mMallLongitude = malllongitude; 
    mLatitude = Double.parseDouble(mMallLatitude); 
    mLongitude = Double.parseDouble(mMallLongitude); 

    String FilterMallName; 
    String FilterMallStreetAddress; 
    String FilterMallCityAddress; 
    String FilterMallContacts; 
     if(mMallName.equals("")){ 
      FilterMallName = "Blank"; 
     }else{ 
      FilterMallName = mMallName; 
     } 

     if(mMallStreetAddress.equals("")){ 
      FilterMallStreetAddress = "Blank"; 
     }else{ 
      FilterMallStreetAddress = mMallStreetAddress; 
     } 

     if(mMallCityAddress.equals("")){ 
      FilterMallCityAddress = "Blank"; 
     }else{ 
      FilterMallCityAddress = mMallCityAddress; 
     } 

     if(mMallContactNumber.equals("")){ 
      FilterMallContacts = "Blank"; 
     }else{ 
      FilterMallContacts = mMallContactNumber; 
     } 


     Log.d("TAG", FilterMallName + ", \n" 
       + FilterMallStreetAddress + ", \n" 
       + FilterMallCityAddress+ ", \n" 
       + FilterMallContacts + "\n" 
       + String.valueOf(mLatitude) + " ," + String.valueOf(mLongitude) 
       + "\n------------------------\n"); 

     mMallCoordinates = new LatLng(mLatitude, mLongitude); 
     mMallMarkerOptions = new MarkerOptions(); 
     mMallMarkerOptions.position(mMallCoordinates); 
     mMallMarkerOptions.title(FilterMallName); 
     mMallMarkerOptions.snippet(FilterMallStreetAddress + ", " + FilterMallCityAddress + ", " + FilterMallContacts); 
     mMallMarkerOptions.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_RED)); 

}

}

来源

2013-05-07 Jarich

你永远不添加任何标记你的GoogleMap后，你怎么能指望他们出现在哪里？ – FWeigl 2013-05-07 15:14:12

感谢您的解决方案！它现在有效..你是对的。我从不添加任何标记。我现在有一个想法。谢谢！ – Jarich 2013-05-07 16:31:56

这里是一个循环，我设置标记在地图上，它为我的伟大工程：

for (Task tempTask : TasksListAppObj.getInstance().tasksRepository.getTasksRepository()) 
       { 
        LatLng latlng = new LatLng(tempTask.getLatitude(), tempTask.getLongtitude()); 
        if (tempTask.getStatus().contentEquals(TasksListActivity.STATUS_WAITING)) 
        { 
         newmarker = map.addMarker(new MarkerOptions().position(latlng).title(tempTask.getTitle()).icon(BitmapDescriptorFactory.fromResource(R.drawable.marker_for_map_blue))); 
        } 
        else if (tempTask.getStatus().contentEquals(TasksListActivity.STATUS_IN_PROGRESS)) 
        { 
         newmarker = map.addMarker(new MarkerOptions().position(latlng).title(tempTask.getTitle()).icon(BitmapDescriptorFactory.fromResource(R.drawable.marker_for_map_bordo))); 
        } 
        else if (tempTask.getStatus().contentEquals(TasksListActivity.STATUS_ON_THE_WAY)) 
        { 
         newmarker = map.addMarker(new MarkerOptions().position(latlng).title(tempTask.getTitle()).icon(BitmapDescriptorFactory.fromResource(R.drawable.marker_for_map_turkiz))); 
        } 
        else if (tempTask.getStatus().contentEquals(TasksListActivity.STATUS_COMPLETE)) 
        { 
         newmarker = map.addMarker(new MarkerOptions().position(latlng).title(tempTask.getTitle()).icon(BitmapDescriptorFactory.fromResource(R.drawable.marker_for_map_orange))); 
        } 
        else if (tempTask.getStatus().contentEquals(TasksListActivity.STATUS_FAILED)) 
        { 
         newmarker = map.addMarker(new MarkerOptions().position(latlng).title(tempTask.getTitle()).icon(BitmapDescriptorFactory.fromResource(R.drawable.marker_for_map_purpul))); 
        } 
}

看它是否可以帮助你。

if语句用于更改标记图标。

您正在丢失的是应用于地图的addMarker方法，以实际将Marker对象添加到GoogleMap对象。

来源

2013-05-07 15:14:41

谢谢！它的作品！..很好的解决方案。谢谢@Emil Adz现在我知道我忘了把addMarker .. :)谢谢。 – Jarich 2013-05-07 16:34:12

那么为什么不接受我的答案，如果它帮助你？ http://meta.stackexchange.com/questions/5234/how-does-accepting-an-answer-work – 2013-05-07 21:17:39

尝试这样的事情在你plotLocationMallMapsUI()database.close()

for (MallMarkers mm : malls) { 
     Marker marker = googlemap.addMarker(new MarkerOptions().position(mm.getmalllatitude, mm.getmalllongitude)); 
    }

来源

2013-05-07 15:18:57 FWeigl

如何使用Android中的MarkerOptions显示/绘制位置Google Maps API v2

回答

相关问题