如何在android中的地圖上的當前位置上設置geopoint？

Question

* 請告訴我如何設置地理點到當前位置上的程序的開始？我想在標記爲「你在這裏」的程序開始時在模擬器中設置覆蓋氣球到當前用戶的位置。我的代碼是這裏 - *

package com.jbb; 

import java.util.List; 
import com.google.android.maps.GeoPoint; 
import com.google.android.maps.MapActivity; 
import com.google.android.maps.MapController; 
import com.google.android.maps.MapView; 
import com.google.android.maps.Overlay; 
import android.content.Context; 
import android.graphics.Bitmap; 
import android.graphics.BitmapFactory; 
import android.graphics.Canvas; 
import android.graphics.Point; 
import android.location.Location; 
import android.location.LocationListener; 
import android.location.LocationManager; 
import android.os.Bundle; 
import android.view.MotionEvent; 
import android.widget.Toast; 


public class jbb_latitudeActivity extends MapActivity 
{  
    LocationManager lm; 
    MyLocationListener locationListener; 
    MapView mapView; 
    MapController mc; 
    GeoPoint geoPoint; 
    /** Called when the activity is first created. */ 
    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     try{ 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.main); 
     geoPoint = new GeoPoint((int) (12.949997* 1E6), (int) (80.140213 * 1E6)); 
     mapView = (MapView) findViewById(R.id.name); 
     mc = mapView.getController(); 
     mc.animateTo(geoPoint); 
     mapView.setClickable(true); 
     mapView.setBuiltInZoomControls(true); 
     mapView.setSatellite(true); 
     mapView.setTraffic(true); 
     List<Overlay> overlays = mapView.getOverlays(); 
       overlays.clear(); 
     overlays.add(new MyLocationListener()); 
     //---use the LocationManager class to obtain GPS locations--- 
     lm = (LocationManager)getSystemService(Context.LOCATION_SERVICE);  
     lm.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0,new MyLocationListener()); 
     } 
    catch (Exception e) { 
     // TODO: handle exception 
     Toast.makeText(getApplicationContext(),e.toString() , 1).show(); 
    } 

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

    private class MyLocationListener extends Overlay implements LocationListener 
    { 
      public void draw(Canvas canvas, MapView mapView, boolean shadow) {        // 1 
      super.draw(canvas, mapView, shadow); 
       if (!shadow) {                    // 2 
        Point point = new Point(); 
        mapView.getProjection().toPixels(geoPoint, point);          // 3 
        Bitmap bmp = BitmapFactory.decodeResource(getResources(), R.drawable.marker_default); // 4 
        int x = point.x - bmp.getWidth()/2;             // 5     inty=point.ybmp.getHeight();              // 6   canvas.drawBitmap(bmp,x,y,null);              // 7 
       } 
      } 
     public boolean onTouchEvent(MotionEvent event, MapView mapView) 
     { 
      //---when user lifts his finger--- 
      if (event.getAction() == 1) {     
       GeoPoint p = mapView.getProjection().fromPixels(
        (int) event.getX(), 
        (int) event.getY()); 
      }        
      return false; 
     } 
     public boolean onTap(GeoPoint point, MapView mapView) 
     { 

      String msg = "Lat:: " + point.getLatitudeE6()/1E6 + " - " + 
         "Lon:: " + point.getLongitudeE6()/1E6; 
      Toast.makeText(mapView.getContext(), msg,1).show(); 
      return true; 
     } 
     @Override 
     public void onLocationChanged(Location loc) { 
      if (loc != null) {     
       Toast.makeText(mapView.getContext(), 
        "Location changed : Lat: " + loc.getLatitude() + 
        " Lng: " + loc.getLongitude(), 
        1).show(); 

       GeoPoint p = new GeoPoint(
         (int) (loc.getLatitude() * 1E6), 
         (int) (loc.getLongitude() * 1E6)); 
       mc.animateTo(p); 
       mc.setZoom(15);     
       mapView.invalidate();  
      } 
     } 
     @Override 
     public void onProviderDisabled(String provider) { 
      // TODO Auto-generated method stub 
      Toast.makeText(mapView.getContext(), "hee", 1).show(); 
     } 
     @Override 
     public void onProviderEnabled(String provider) { 
      // TODO Auto-generated method stub 
      Toast.makeText(mapView.getContext(), "hee", 1).show(); 
     } 
     @Override 
     public void onStatusChanged(String provider, int status, 
      Bundle extras) { 
      // TODO Auto-generated method stub 
      Toast.makeText(mapView.getContext(), "hee", 1).show(); 
     } 
    }  
} 

Answer 1

首先，你應該補充許可

<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/> 
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/> 
<uses-permission android:name="android.permission.INTERNET"></uses-permission> 

然後嘗試，

Criteria criteria = new Criteria(); 
String bestProvider = locationManager.getBestProvider(criteria, true); 
Location location = locationManager.getLastKnownLocation(bestProvider); 
locationManager.requestLocationUpdates(bestProvider, 0, 0, new TestLocationListener()); 

代替，

lm = (LocationManager)getSystemService(Context.LOCATION_SERVICE);  
lm.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0,new MyLocationListener()); 

Answer 2

http://mobiforge.com/developing/story/using-google-maps-android

這是谷歌地圖在Android的例子最好的網站。

Answer 3

這對我的作品。我希望這將有助於ü。如果喜歡的話。

public class MyGoogleMapActivity extends MapActivity implements LocationListener { 
/** Called when the activity is first created. */ 
EditText  txted   = null; 
Button   btnSimple  = null; 
MapView   gMapView  = null; 
MapController mc    = null; 
Drawable  defaultMarker = null; 
GeoPoint  p    = null; 
double lattitude=18.5297 ; 
double longitude=73.8491 ; 
@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.main); 

    txted=(EditText)findViewById(R.id.id1); 
    String currentLocation="Lattitude :"+lattitude+" Longitude :"+longitude; 
    txted.setText(currentLocation); 

    gMapView=(MapView)findViewById(R.id.myGMap); 
    p= new GeoPoint((int)(lattitude * 1E6), (int)(longitude * 1E6)); 


    Canvas canvas=new Canvas(); 
    MyLocationOverlay locationOverlay=new MyLocationOverlay(); 

    List<Overlay> list=gMapView.getOverlays(); 
    list.add(locationOverlay); 

    ZoomControls zoomControls=(ZoomControls) gMapView.getZoomControls(); 
    zoomControls.setLayoutParams(new ViewGroup.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT)); 
    gMapView.addView(zoomControls); 
    gMapView.displayZoomControls(true); 
    mc=gMapView.getController(); 
    mc.setCenter(p); 
    mc.animateTo(p); 
    mc.setZoom(14); 
    LocationManager locationManager=(LocationManager) getSystemService(Context.LOCATION_SERVICE); 
    locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 1000L, 500.0f, this); 
} 

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

@Override 
public void onLocationChanged(Location location) { 
    if(location!=null){ 
     double lat=location.getLatitude(); 
     double lng=location.getLongitude(); 
     String currentLocation="Lattitude :"+lat+" Longitude :"+lng; 
      txted.setText(currentLocation); 
      mc.animateTo(p); 

    } 

} 

@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 

} 
protected class MyLocationOverlay extends com.google.android.maps.Overlay{ 

    @Override 
    public boolean draw(Canvas canvas, MapView mapView, boolean shadow, 
      long when) { 
     Paint paint=new Paint(); 
     super.draw(canvas, mapView, shadow, when); 
     Point myScreenCords= new Point(); 
     mapView.getProjection().toPixels(p, myScreenCords); 
     paint.setStrokeWidth(1); 
     paint.setARGB(255, 255, 255, 255); 
     paint.setStyle(Paint.Style.STROKE); 
     Bitmap bmp=BitmapFactory.decodeResource(getResources(), R.drawable.marker); 
     canvas.drawBitmap(bmp, myScreenCords.x, myScreenCords.y, paint); 
     canvas.drawText("I m here...", myScreenCords.x,myScreenCords.y, paint); 
     return true; 

    } 

    @Override 
    public boolean onTouchEvent(MotionEvent e, MapView mapView) { 
     super.onTouchEvent(e, mapView); 
     if(e.getAction()==1){ 
      GeoPoint gp=gMapView.getProjection().fromPixels((int)e.getX(),(int)e.getY()); 
     } 
     return true; 
    } 


}