谷歌地图API位置更新

Question

我在我的Android应用程序中使用地图，但我想使用位置更新并在地图上显示它，我正在跟踪谷歌开发人员有关使用LocationRequest（）位置更新的文档，但不知道如何在地图中使用它。 这里是我的activity.java

import android.content.Context; 
import android.location.Criteria; 
import android.location.Location; 
import android.location.LocationManager; 
import android.support.v4.app.FragmentActivity; 
import android.os.Bundle; 
import android.util.Log; 

import com.google.android.gms.common.ConnectionResult; 
import com.google.android.gms.common.api.GoogleApiClient; 
import com.google.android.gms.location.LocationListener; 
import com.google.android.gms.location.LocationRequest; 
import com.google.android.gms.location.LocationServices; 
import com.google.android.gms.maps.CameraUpdateFactory; 
import com.google.android.gms.maps.GoogleMap; 
import com.google.android.gms.maps.MapFragment; 
import com.google.android.gms.maps.OnMapReadyCallback; 
import com.google.android.gms.maps.SupportMapFragment; 
import com.google.android.gms.maps.model.LatLng; 
import com.google.android.gms.maps.model.MarkerOptions; 
import com.google.android.gms.common.api.GoogleApiClient; 
import com.google.android.gms.common.api.GoogleApiClient.ConnectionCallbacks; 
import com.google.android.gms.common.api.GoogleApiClient.OnConnectionFailedListener; 

public class MapaActivity extends FragmentActivity implements OnMapReadyCallback,ConnectionCallbacks,OnConnectionFailedListener, LocationListener { 

    private GoogleMap mMap; // Might be null if Google Play services APK is not available. 

    private GoogleApiClient mGoogleApiClient; 
    // Request code to use when launching the resolution activity 
    private static final int REQUEST_RESOLVE_ERROR = 1001; 
    // Unique tag for the error dialog fragment 
    private static final String DIALOG_ERROR = "dialog_error"; 
    // Bool to track whether the app is already resolving an error 
    private boolean mResolvingError = false; 
    // etiqueta para logs 
    private final String TAG="Mapas"; 
    //coordenadas------------------- 
    private String lat; 
    private String lon; 
    //variables para localizacion 
    Location mLastLocation; 
    Location mCurrentLocation; 
    LocationRequest mLocationRequest; 
    String mLastUpdateTime; 
    //// posicion anterior/////////////// 
    LocationManager locationManager; 



    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_mapa); 
     // Create a GoogleApiClient instance 
     // Kick off the process of building a GoogleApiClient and requesting the LocationServices 
     // API. 
     buildGoogleApiClient(); 
//nuevo codigo 
     SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager() 
       .findFragmentById(R.id.map); 
     mapFragment.getMapAsync(this); 


    } 

    protected synchronized void buildGoogleApiClient() { 
     Log.v(TAG, "Lanzando GoogleApiClient"); 
     mGoogleApiClient = new GoogleApiClient.Builder(this) 
       .addConnectionCallbacks(this) 
       .addOnConnectionFailedListener(this) 
       .addApi(LocationServices.API) 
       .build(); 
     createLocationRequest(); 
    } 
    //location request 
    // actualiza cada 40 segundos min 20 segundos 
    protected void createLocationRequest() { 
     mLocationRequest = new LocationRequest(); 
     mLocationRequest.setInterval(40000); 
     mLocationRequest.setFastestInterval(20000); 
     //prioridad alta precision 
     mLocationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY); 
     // Log.v(TAG,"se ingresa al locationRequest"); 
    } 

    @Override 
    protected void onResume() { 
     super.onResume(); 
     // setUpMapIfNeeded(); 
    } 
    @Override 
    protected void onPause(){ 
     super.onPause(); 
     Log.v(TAG, "evento onPause"); 
    } 

    @Override 
    protected void onStop(){ 
     super.onStop(); 
     Log.v(TAG, "evento onStop"); 

    } 
    @Override 
    protected void onDestroy(){ 
     super.onDestroy(); 
     Log.v(TAG, "evento onDestroy"); 
    }; 
    @Override 
    public void onMapReady(GoogleMap googleMap) { 
     // Add a marker in Sydney, Australia, and move the camera. 

     // habilitar controles de zoom 
     googleMap.getUiSettings().setZoomControlsEnabled(true); 
     googleMap.setMapType(GoogleMap.MAP_TYPE_NORMAL); 
     //habilitar brujula 
     googleMap.getUiSettings().setCompassEnabled(true); 
     googleMap.setMyLocationEnabled(true); 

     // para pasar a funcion 
     locationManager = (LocationManager)getSystemService(Context.LOCATION_SERVICE); 
     // Create a criteria object needed to retrieve the provider 
     Criteria criteria = new Criteria(); 
     // Get the name of the best available provider 
     String provider = locationManager.getBestProvider(criteria, true); 

     // We can use the provider immediately to get the last known location 
     Location location = locationManager.getLastKnownLocation(provider); 
     googleMap.clear(); 
     // convert the location object to a LatLng object that can be used by the map API 
     LatLng currentPosition = new LatLng(location.getLatitude(), location.getLongitude()); 
     Log.v(TAG, "Latitud :" + location.getLatitude()); 
     googleMap.addMarker(new MarkerOptions().position(currentPosition).title("Yo")); 
     // zoom to the current location 
     googleMap.animateCamera(CameraUpdateFactory.newLatLngZoom(currentPosition, 13)); 
     googleMap.setMyLocationEnabled(true); 
     Log.v(TAG, currentPosition.toString()); 
     //pasar la posicion para grabar en el servidor 

    } 

    @Override 
    public void onConnected(Bundle bundle) { 
    } 
    @Override 
    public void onConnectionSuspended(int i) { 
    } 
    @Override 
    public void onLocationChanged(Location location) { 
    } 
    @Override 
    public void onConnectionFailed(ConnectionResult connectionResult) { 

    } 
} 

，这里是我的观点

<fragment xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:tools="http://schemas.android.com/tools" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:id="@+id/map" 
    tools:context=".MapaActivity" 
    android:name="com.google.android.gms.maps.SupportMapFragment" /> 

Answer 1

它看起来像你的老开源位置API混合FusedLocationProviderApi。如果您使用FusedLocationProviderApi，只需坚持。

您错过了两个关键部分，致电mGoogleApiClient.connect()，致电requestLocationUpdates()。

这里是你的代码应该是什么样子的一般结构：

public class MainActivity extends FragmentActivity 
     implements OnMapReadyCallback, 
     GoogleApiClient.ConnectionCallbacks, GoogleApiClient.OnConnectionFailedListener, 
     LocationListener { 

    private GoogleMap map; 
    private LocationRequest mLocationRequest; 
    private GoogleApiClient mGoogleApiClient; 
    private Location mLastLocation; 
    private Marker marker; 

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

    @Override 
    protected void onResume() { 
     super.onResume(); 

     buildGoogleApiClient(); 
     mGoogleApiClient.connect(); 

     if (map == null) { 
      SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager() 
        .findFragmentById(R.id.map); 

      mapFragment.getMapAsync(this); 
     } 
    } 

    @Override 
    public void onMapReady(GoogleMap retMap) { 

     map = retMap; 

     setUpMap(); 

    } 

    public void setUpMap(){ 

     map.setMapType(GoogleMap.MAP_TYPE_HYBRID); 
     map.setMyLocationEnabled(true); 
    } 

    @Override 
    protected void onPause(){ 
     super.onPause(); 
     if (mGoogleApiClient != null) { 
      LocationServices.FusedLocationApi.removeLocationUpdates(mGoogleApiClient, this); 
     } 
    } 

    protected synchronized void buildGoogleApiClient() { 
     Toast.makeText(this, "buildGoogleApiClient", Toast.LENGTH_SHORT).show(); 
     mGoogleApiClient = new GoogleApiClient.Builder(this) 
       .addConnectionCallbacks(this) 
       .addOnConnectionFailedListener(this) 
       .addApi(LocationServices.API) 
       .build(); 
    } 

    @Override 
    public void onConnected(Bundle bundle) { 
     Toast.makeText(this,"onConnected",Toast.LENGTH_SHORT).show(); 

     mLocationRequest = new LocationRequest(); 
     mLocationRequest.setInterval(1000); 
     mLocationRequest.setFastestInterval(1000); 
     mLocationRequest.setPriority(LocationRequest.PRIORITY_BALANCED_POWER_ACCURACY); 

     //mLocationRequest.setSmallestDisplacement(0.1F); 

     LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient, mLocationRequest, this); 
    } 

    @Override 
    public void onConnectionSuspended(int i) { 
     Toast.makeText(this,"onConnectionSuspended",Toast.LENGTH_SHORT).show(); 
    } 

    @Override 
    public void onConnectionFailed(ConnectionResult connectionResult) { 
     Toast.makeText(this,"onConnectionFailed",Toast.LENGTH_SHORT).show(); 
    } 

    @Override 
    public void onLocationChanged(Location location) { 
     mLastLocation = location; 

     //remove previous current location Marker 
     if (marker != null){ 
      marker.remove(); 
     } 

     double dLatitude = mLastLocation.getLatitude(); 
     double dLongitude = mLastLocation.getLongitude(); 
     marker = map.addMarker(new MarkerOptions().position(new LatLng(dLatitude, dLongitude)) 
       .title("My Location").icon(BitmapDescriptorFactory 
         .defaultMarker(BitmapDescriptorFactory.HUE_RED))); 
     map.moveCamera(CameraUpdateFactory.newLatLngZoom(new LatLng(dLatitude, dLongitude), 8)); 

    } 

}