打开应用程序时自动获取当前位置

Question

我无法在 Google 地图活动中获取我的当前位置，我已确保在 Android 清单中实现了权限，但它仍然变为 0,0 而不是我当前的位置。在模拟器上，位置首选项设置为开启。

这是我的主要活动：

import android.support.v4.app.FragmentActivity;
import android.os.Bundle;

import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.SupportMapFragment;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.MarkerOptions;

public class RainstormMap extends FragmentActivity {

private GoogleMap mMap; 

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

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


private void setUpMapIfNeeded() {

    if (mMap == null) {
        // Try to obtain the map from the SupportMapFragment.
        mMap = ((SupportMapFragment)              getSupportFragmentManager().findFragmentById(R.id.map))
                .getMap();
        // Check if we were successful in obtaining the map.
        if (mMap != null) {
            setUpMap();
        }
    }
}

/**
 * This is where we can add markers or lines, add listeners or move the camera. In this case, we
 * just add a marker near Africa.
 * <p/>
 * This should only be called once and when we are sure that {@link #mMap} is not null.
 */
private void setUpMap() {
    mMap.addMarker(new MarkerOptions().position(new LatLng(0, 0)).title("Marker"));
}

Answer 1

你需要实现定位服务！

使用 LocationListener 和 GoogleApiClient 接口

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

    private final static int CONNECTION_FAILURE_RESOLUTION_REQUEST = 1000;

    /**
     * Map Settings
     */
    private static final int DEFAULT_ZOOM = 15;
    private static final int LOCATION_INTERVAL = 1000;

    /**
     * Map Properties and Utilities
     */
    private GoogleMap mMap;
    private GoogleApiClient mApiClient;
    private LocationRequest mLocationRequest;

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

        mApiClient = new GoogleApiClient.Builder(this)
                .addApi(LocationServices.API)
                .addConnectionCallbacks(this)
                .addOnConnectionFailedListener(this)
                .build();

        // Create the LocationRequest object
        mLocationRequest = LocationRequest.create()
                .setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY)
                .setInterval(LOCATION_INTERVAL)        // 10 seconds, in milliseconds
                .setFastestInterval(LOCATION_INTERVAL); // 1 second, in milliseconds

        // setup map
        ((MapFragment) getFragmentManager().findFragmentById(R.id.googleMap)).getMapAsync(this);
    }

    /**
     * When get User Geo point call this method to list places by location
     *
     * @param location
     *          User current location
     */
    private void handleNewLocation(Location location) {
        // go to user location
        mMap.animateCamera(CameraUpdateFactory.newLatLngZoom(
                new LatLng(location.getLatitude(),
                        location.getLongitude()),
                DEFAULT_ZOOM
        ));

        mMap.addMarker(new MarkerOptions()
                .title("Marker")
                .position(new LatLng(
                        location.getLatitude(),
                        location.getLongitude()));


    }

    /**
     * --------- Google API Connection and get Map if is ready ---------
     */

    @Override
    public void onConnected(Bundle bundle) {
        Location loc = LocationServices.FusedLocationApi.getLastLocation(mApiClient);

        if (loc != null) {
            handleNewLocation(loc);
        } else {
            LocationServices.FusedLocationApi.requestLocationUpdates(mApiClient, mLocationRequest, this);
        }
    }

    @Override
    public void onConnectionFailed(ConnectionResult connectionResult) {
        if (connectionResult.hasResolution()) {
            try {
                // Start an Activity that tries to resolve the error
                connectionResult.startResolutionForResult(this, CONNECTION_FAILURE_RESOLUTION_REQUEST);
            } catch (IntentSender.SendIntentException e) {
                e.printStackTrace();
            }
        } else {
            Log.i(Const.TAG, "Location services connection failed with code " + connectionResult.getErrorCode());
        }
    }

    @Override
    public void onConnectionSuspended(int i) {
        //TODO connection suspended implement
    }

    @Override
    public void onLocationChanged(Location location) {
        handleNewLocation(location);
    }

    @Override
    public void onMapReady(GoogleMap googleMap) {
        mMap = googleMap;
        mMap.setMyLocationEnabled(true);
    }

    /**
     * --------- Activity Life Cycle ---------
     */

    @Override
    public void onResume() {
        super.onResume();
        mApiClient.connect();
    }

    @Override
    public void onPause() {
        super.onPause();
        if (mApiClient.isConnected()) {
            mApiClient.disconnect();
        }
    }
}

activity_rainstorm_map.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:id="@+id/rootView">

    <fragment
        android:id="@+id/googleMap"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:tag="ftag_google_map"
        android:name="com.google.android.gms.maps.MapFragment"/>

</RelativeLayout>