在google上获取用户当前位置mapview

Question

嗨，我一直在尝试获取并查明手机的位置（用户当前的位置），但是我没有运气。我希望有人能够帮助我解决这个问题。

只是添加一些，我收到“无法获取连接工厂客户端”错误。这是否与返回用户位置的能力有关？

如果有帮助，我一直在关注新手的教程。

或者这与我的API密钥有关吗？但是，我能够正确地接收的地图，但不能精确定位用户的当前位置

---

的主要代码：

public class Map extends MapActivity implements LocationListener{ 

MapView map; 
long start; 
long stop; 
MyLocationOverlay compass; 
MapController controller; 
int x,y; 
GeoPoint touchedPoint; 
Drawable d; 
List<Overlay> overlayList; 

LocationManager lm; 
LocationListener ll; 
String towers; 
int lat = 0; 
int longi = 0; 


@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_map); 
    map = (MapView)findViewById(R.id.mapview); 
    map.setBuiltInZoomControls(true); 

    touch t = new touch(); 
    overlayList = map.getOverlays(); 
    overlayList.add(t); 
    compass = new MyLocationOverlay(Map.this, map); 
    overlayList.add(compass); 
    controller = map.getController(); 
    GeoPoint point = new GeoPoint(832332,4121093); 
    controller.animateTo(point); 
    controller.setZoom(8); 


    d = getResources().getDrawable(R.drawable.pointer); 

    //placing location 
    lm =(LocationManager) getSystemService(Context.LOCATION_SERVICE); 

    Criteria crit = new Criteria(); 
    towers = lm.getBestProvider(crit, false); 
    Location loc = lm.getLastKnownLocation(towers); 

    if(loc != null){ 
     lat = (int) (loc.getLatitude() *1E6); 
     longi = (int)(loc.getLongitude()*1E6); 
     GeoPoint location = new GeoPoint(lat, longi); 
     OverlayItem overlayitem = new OverlayItem(location , "wassup", "2nd string"); 
     CustomPinPoint custom = new CustomPinPoint(d, Map.this); 
     custom.insertPinPoint(overlayitem); 
     overlayList.add(custom); 

    }else{ 
     Toast.makeText(Map.this, "Location is null", Toast.LENGTH_LONG).show(); 
     lm.requestLocationUpdates(towers, 1500, 1, this); 
    } 


} 


@Override 
protected void onPause() { 
    // TODO Auto-generated method stub 
    compass.disableCompass(); 
    super.onPause(); 
    lm.removeUpdates(this); 
} 

@Override 
protected void onResume() { 
    // TODO Auto-generated method stub 
    compass.enableCompass(); 
    super.onResume(); 
    lm.requestLocationUpdates(towers, 500, 1, this); 

} 

我认为你可以忽略alertdialog

public class touch extends Overlay { 

    public boolean onTouchEvent(MotionEvent e, MapView m){ 
     if(e.getAction()== MotionEvent.ACTION_DOWN){ 
      start = e.getEventTime(); 
      x = (int) e.getX(); 
      y = (int) e.getY(); 
      touchedPoint = map.getProjection().fromPixels(x, y); 

     } 
     if(e.getAction()== MotionEvent.ACTION_UP){ 
      stop = e.getEventTime(); 
     } 
     if(stop-start >1200){ 
      AlertDialog alert = new AlertDialog.Builder(Map.this).create(); 
      alert.setTitle("Option"); 
      alert.setMessage("Pick the option"); 
      alert.setCanceledOnTouchOutside(true); 
      alert.setButton("Place pointer pinpoint", 
        new DialogInterface.OnClickListener() { 

       @Override 
       public void onClick(DialogInterface dialog, int which) { 
        // TODO Auto-generated method stub 

        OverlayItem overlayitem = new OverlayItem(touchedPoint , "wassup", "2nd string"); 
        CustomPinPoint custom = new CustomPinPoint(d, Map.this); 
        custom.insertPinPoint(overlayitem); 
        overlayList.add(custom); 

       } 
      }); 

      alert.setButton2("Get address", 
        new DialogInterface.OnClickListener() { 

       @Override 
       public void onClick(DialogInterface dialog, int which) { 
        // TODO Auto-generated method stub 

        Geocoder geocoder = new Geocoder(getBaseContext(), Locale.getDefault()); 
         try{ 
          List<Address> address = geocoder.getFromLocation(touchedPoint.getLatitudeE6() 
            /1E6, touchedPoint.getLongitudeE6() /1E6, 1); 

          if (address.size()>0){ 
           String display = ""; 

           for(int i=0 ; i<address.get(0).getMaxAddressLineIndex(); i++){ 
            display +=address.get(0).getAddressLine(i) + "\n"; 
           } 
           Toast t = Toast.makeText(getBaseContext(), display, Toast.LENGTH_LONG); 
           t.show(); 
          } 
         } catch (IOException e) { 
          // TODO Auto-generated catch block 
          e.printStackTrace(); 
         }finally{ 

         } 
       } 
      }); 

      alert.setButton3("Toggle View", 
        new DialogInterface.OnClickListener() { 

       @Override 
       public void onClick(DialogInterface dialog, int which) { 
        // TODO Auto-generated method stub 

        if(map.isSatellite()){ 
         map.setSatellite(false); 
         map.setStreetView(true); 
        }else{ 
         map.setStreetView(false); 
         map.setSatellite(true); 
        } 

       } 
      }); 

      alert.show(); 
      return true; 


     } 
     return false; 

    } 

} 




@Override 
protected boolean isRouteDisplayed() { 
    // TODO Auto-generated method stub 
    return false; 
} 


@Override 
public boolean onCreateOptionsMenu(Menu menu) { 
    getMenuInflater().inflate(R.menu.activity_map, menu); 
    return true; 
} 


@Override 
public void onLocationChanged(Location l) { 
    // TODO Auto-generated method stub 
    lat = (int)(l.getLatitude()*1E6); 
    longi = (int)(l.getLongitude()*1E6); 
    GeoPoint location = new GeoPoint(lat, longi); 
    OverlayItem overlayitem = new OverlayItem(location , "wassup", "2nd string"); 
    CustomPinPoint custom = new CustomPinPoint(d, Map.this); 
    custom.insertPinPoint(overlayitem); 
    overlayList.add(custom); 

} 


@Override 
public void onProviderDisabled(String provider) { 
    // TODO Auto-generated method stub 

} 


@Override 
public void onProviderEnabled(String provider) { 
    // TODO Auto-generated method stub 

} 


@Override 
public void onStatusChanged(String provider, int status, Bundle extras) { 
    // TODO Auto-generated method stub 

} 


} 

---

CustomPinPoint代码：

public class CustomPinPoint extends ItemizedOverlay<OverlayItem> { 

private ArrayList<OverlayItem> pinpoints = new ArrayList<OverlayItem>(); 
private Context c; 

// tesst google code 
public CustomPinPoint(Drawable defaultMarker) { 
    super(boundCenterBottom(defaultMarker)); 
    // TODO Auto-generated constructor stub 
} 

public CustomPinPoint(Drawable defaultMarker, Context context) { 
    // TODO Auto-generated constructor stub 
    this(defaultMarker); //original code 


} 

@Override 
protected OverlayItem createItem(int i) { 
    // TODO Auto-generated method stub 
    return pinpoints.get(i); 

} 

@Override 
public int size() { 
    // TODO Auto-generated method stub 
    return pinpoints.size(); 
} 

public void insertPinPoint(OverlayItem item){ 
    pinpoints.add(item); 
// this.populate(); // original code 
// test code 
    populate(); 
} 

@Override 
protected boolean onTap(int index){ 
    OverlayItem item = pinpoints.get(index); 
    AlertDialog.Builder dialog = new AlertDialog.Builder(c); 
    dialog.setTitle(item.getTitle()); 
    dialog.setMessage(item.getSnippet()); 
    dialog.show(); 
    return true; 

} 

public void addOverlay(OverlayItem overlay) { 
    // TODO Auto-generated method stub 
    pinpoints.add(overlay); 
    populate(); 
} 



    } 

---

XML代码：

  <com.google.android.maps.MapView xmlns:android="http://schemas.android.com/apk/res/android" 
      xmlns:tools="http://schemas.android.com/tools" 
      android:id="@+id/mapview" 
      android:enabled="true" 
      android:clickable="true" 
      android:layout_width="fill_parent" 
      android:layout_height="fill_parent" 
      android:apiKey="0t9rHfGlUPgisa8P9MRAsSxhRXTVCL0XJog7uiA" 
      /> 

Answer 1

嗯，这是令人尴尬的，事实证明我的代码是正确的，问题在于设备的GPS未打开。那么我希望我的代码可以帮助有需要的人。干杯!

Answer 2

这里是如何做到这一点很容易，尝试实现这个逻辑到项目的例子：

public class MyMapActivity extends MapActivity { 
private MapView map; 
private MapController controller; 
@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 

    setContentView(R.layout.mymap); 
    initMapView(); 
    initMyLocation(); 

      map.invalidate(); 
} 

    private void initMapView() { 
    map = (MapView) findViewById(R.id.map); 
    controller = map.getController(); 
    map.setSatellite(true); 
    map.setBuiltInZoomControls(true); 
} 
private void initMyLocation() { 
    final MyLocationOverlay overlay = new MyLocationOverlay(this, map); 
    overlay.enableMyLocation(); 
    //overlay.enableCompass(); // does not work in emulator 
    overlay.runOnFirstFix(new Runnable() { 
     public void run() { 
      // Zoom in to current location 
      controller.setZoom(15); 
      controller.animateTo(overlay.getMyLocation()); 
    }}); 
} 

}