如何在地圖上跟蹤和顯示用戶的位置

Question

標題幾乎涵蓋了它。 我想使用手機的GPS來跟蹤用戶的位置，並在他們的位置在地圖上顯示標記。 我希望此標記幾乎可以不斷更新其位置，以便用戶移動標記時也會隨之移動。

我可以很好地顯示地圖，但是在弄清楚如何使用位置服務時遇到了麻煩。 我用來顯示地圖的代碼如下。

布局：

<?xml version="1.0" encoding="utf-8"?>
<!-- The layout for the MainMap class -->
<fragment xmlns:android="http://schemas.android.com/apk/res/android"
          android:id="@+id/map"
          android:layout_width="match_parent"
          android:layout_height="match_parent"
          android:name="com.google.android.gms.maps.SupportMapFragment"/>

地圖活動：

public class MainMap extends FragmentActivity {
    GoogleMap map;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main_map);


        // Get a handle to the Map Fragment
        map = ((SupportMapFragment) getSupportFragmentManager()
                .findFragmentById(R.id.map)).getMap();

        map.setMyLocationEnabled(true);
    }


    private void setUpMapIfNeeded() {
        // Do a null check to confirm that we have not already instantiated the map.
        if (map == null) {
            map = ((SupportMapFragment) getSupportFragmentManager().
                  findFragmentById(R.id.map)).getMap();
            // Check if we were successful in obtaining the map.
            if (map != null) {
               // The Map is verified. It is now safe to manipulate the map.
            }
        }          
    }
}//MainMap

任何幫助表示贊賞。 謝謝。

Answer 1

您需要為此添加LocationListener。

public class MainMap extends FragmentActivity{

public LocationManager locationManager;
public LocationUpdateListener listener;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main_map);

    // Get a handle to the Map Fragment
    map = ((SupportMapFragment) getSupportFragmentManager()
            .findFragmentById(R.id.map)).getMap();

    map.setMyLocationEnabled(true);

    locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
    listener = new LocationUpdateListener();        
    locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 0, 0, listener);
    locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, listener);
}
private void setUpMapIfNeeded() {
    // Do a null check to confirm that we have not already instantiated the map.
    if (map == null) {
        map = ((SupportMapFragment) getSupportFragmentManager().
              findFragmentById(R.id.map)).getMap();
        // Check if we were successful in obtaining the map.
        if (map != null) {
           // The Map is verified. It is now safe to manipulate the map.
        }
    }          
}
class LocationUpdateListener implements LocationListener{

    @Override
    public void onLocationChanged(Location location) {
        // TODO Auto-generated method stub

        // update your marker here
    }

    @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

    }

}

}

Answer 2

http://www.javacodegeeks.com/2010/09/android-location-based-services.html

您可以使用此項目來幫助您獲取位置，然后可以在該位置添加標記。