如何使用FusedLocationProviderClient获取GoogleMap中的当前位置 [英] How to get current Location in GoogleMap using FusedLocationProviderClient
本文介绍了如何使用FusedLocationProviderClient获取GoogleMap中的当前位置的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我想定期（比如说每2分钟）当前的位置更新我正在关注官方文档，我编写了这段代码，但它没有每两分钟给出当前的位置更新，即使在我正在通过的LocationRequest对象中指定在requestLocationUpdates（）中，这里是代码：
公共类MapsActivity扩展FragmentActivity实现OnMapReadyCallback，
GoogleApiClient.ConnectionCallbacks，GoogleApiClient .OnConnectionFailedListener {
private FusedLocationProviderClient FusedLocationClient;
私有GoogleApiClient mGoogleApiClient;
@Override
protected void onCreate（Bundle savedInstanceState）{
super.onCreate（savedInstanceState）;
setContentView（R.layout.activity_maps）;
if（mGoogleApiClient == null）{
mGoogleApiClient = new GoogleApiClient.Builder（this）
.addConnectionCallbacks（this）
.addOnConnectionFailedListener（this）
.addApi（ LocationServices.API）
.build（）;
}
SupportMapFragment map =
getSupportFragmentManager（）。findFragmentById（R.id.map））;
map.getMapAsync（this）;
FusedLocationClient LocationServices.getFusedLocationProviderClient（this）;
}
@Override
public void onConnected（Bundle bundle）{
FusedLocationClient.getLastLocation（）
.addOnSuccessListener（this，new OnSuccessListener< Location>（）{
@Override
public void onSuccess（Location location）{
if（location！= null）{
Log.i（ MainActivity，+ location.getLongitude（））
}
}
}）;
FusedLocationClient = LocationServices.getFusedLocationProviderClient（this）;
FusedLocationClient.requestLocationUpdates（requestLocation（），
new LocationCallback（）{
@Override
public void onLocationResult（LocationResult locationResult）{
for（Location location：locationResult。 getLocations（））{
Log.i（MainActivity，+ location.getLongitude（））;
//每2分钟没有获得当前位置更新
}
};
}，null）;
}
@Override
public void onConnectionSuspended（int i）{}
@Override
public void onConnectionFailed（ ConnectionResult connectionResult）{}
解决方案
这类似于我的< a href =https://stackoverflow.com/a/34582595/4409409>此处的其他答案，已更新为使用最近推出的
该位置将在应用启动时更新，每两分钟更新一次：
I want to get periodic (say every 2 minutes) current location updates for this I'm following official documentation, I wrote this code but its not giving current location updates every two minutes even specified in LocationRequest object that I'm passing in requestLocationUpdates(), here is code:
public class MapsActivity extends FragmentActivity implements OnMapReadyCallback,
GoogleApiClient.ConnectionCallbacks, GoogleApiClient.OnConnectionFailedListener{
private FusedLocationProviderClient FusedLocationClient;
private GoogleApiClient mGoogleApiClient;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_maps);
if (mGoogleApiClient == null) {
mGoogleApiClient = new GoogleApiClient.Builder(this)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.addApi(LocationServices.API)
.build();
}
SupportMapFragment map =
getSupportFragmentManager().findFragmentById(R.id.map));
map.getMapAsync(this);
FusedLocationClient LocationServices.getFusedLocationProviderClient(this);
}
@Override
public void onConnected(Bundle bundle) {
FusedLocationClient.getLastLocation()
.addOnSuccessListener(this, new OnSuccessListener<Location>() {
@Override
public void onSuccess(Location location) {
if (location != null) {
Log.i("MainActivity ", "" + location.getLongitude())
}
}
});
FusedLocationClient = LocationServices.getFusedLocationProviderClient(this);
FusedLocationClient.requestLocationUpdates(requestLocation(),
new LocationCallback(){
@Override
public void onLocationResult(LocationResult locationResult) {
for (Location location : locationResult.getLocations()) {
Log.i("MainActivity ", "" + location.getLongitude());
//not getting current location updates every 2 minutes
}
};
},null);
}
@Override
public void onConnectionSuspended(int i) {}
@Override
public void onConnectionFailed(ConnectionResult connectionResult) {}
解决方案
This is similar to my other answer here, updated to use the recently introduced FusedLocationProviderClient class.
In order to use a FusedLocationProviderClient in conjunction with a Google Map:
Wait until the Google Map is ready
Request the Location permission at runtime if needed
Request location updates once the permission is granted
Update the Google Map once the user's location is obtained
First ensure that you're using at least version 11 of Google Play Services, as older versions don't have the FusedLocationProviderClient class (newer versions will work as well):
dependencies {
compile 'com.google.android.gms:play-services-maps:11.6.0'
compile 'com.google.android.gms:play-services-location:11.6.0'
//........
}
Note that the FusedLocationProviderClient is present in version 11.0.2, but due to bugs in the initial implementation, it's recommended that you only use this class on 11.6.0 and later. From the documentation:
Note: It's recommended to use Google Play services version 11.6.0 or higher, which includes bug fixes for this class.
Here is the full Activity class:
public class MapsActivity extends AppCompatActivity
implements OnMapReadyCallback {
GoogleMap mGoogleMap;
SupportMapFragment mapFrag;
LocationRequest mLocationRequest;
Location mLastLocation;
Marker mCurrLocationMarker;
FusedLocationProviderClient mFusedLocationClient;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
getSupportActionBar().setTitle("Map Location Activity");
mFusedLocationClient = LocationServices.getFusedLocationProviderClient(this);
mapFrag = (SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map);
mapFrag.getMapAsync(this);
}
@Override
public void onPause() {
super.onPause();
//stop location updates when Activity is no longer active
if (mFusedLocationClient != null) {
mFusedLocationClient.removeLocationUpdates(mLocationCallback);
}
}
@Override
public void onMapReady(GoogleMap googleMap) {
mGoogleMap = googleMap;
mGoogleMap.setMapType(GoogleMap.MAP_TYPE_HYBRID);
mLocationRequest = new LocationRequest();
mLocationRequest.setInterval(120000); // two minute interval
mLocationRequest.setFastestInterval(120000);
mLocationRequest.setPriority(LocationRequest.PRIORITY_BALANCED_POWER_ACCURACY);
if (android.os.Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
if (ContextCompat.checkSelfPermission(this,
Manifest.permission.ACCESS_FINE_LOCATION)
== PackageManager.PERMISSION_GRANTED) {
//Location Permission already granted
mFusedLocationClient.requestLocationUpdates(mLocationRequest, mLocationCallback, Looper.myLooper());
mGoogleMap.setMyLocationEnabled(true);
} else {
//Request Location Permission
checkLocationPermission();
}
}
else {
mFusedLocationClient.requestLocationUpdates(mLocationRequest, mLocationCallback, Looper.myLooper());
mGoogleMap.setMyLocationEnabled(true);
}
}
LocationCallback mLocationCallback = new LocationCallback() {
@Override
public void onLocationResult(LocationResult locationResult) {
List<Location> locationList = locationResult.getLocations();
if (locationList.size() > 0) {
//The last location in the list is the newest
Location location = locationList.get(locationList.size() - 1);
Log.i("MapsActivity", "Location: " + location.getLatitude() + " " + location.getLongitude());
mLastLocation = location;
if (mCurrLocationMarker != null) {
mCurrLocationMarker.remove();
}
//Place current location marker
LatLng latLng = new LatLng(location.getLatitude(), location.getLongitude());
MarkerOptions markerOptions = new MarkerOptions();
markerOptions.position(latLng);
markerOptions.title("Current Position");
markerOptions.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_MAGENTA));
mCurrLocationMarker = mGoogleMap.addMarker(markerOptions);
//move map camera
mGoogleMap.moveCamera(CameraUpdateFactory.newLatLngZoom(latLng, 11));
}
}
};
public static final int MY_PERMISSIONS_REQUEST_LOCATION = 99;
private void checkLocationPermission() {
if (ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION)
!= PackageManager.PERMISSION_GRANTED) {
// Should we show an explanation?
if (ActivityCompat.shouldShowRequestPermissionRationale(this,
Manifest.permission.ACCESS_FINE_LOCATION)) {
// Show an explanation to the user *asynchronously* -- don't block
// this thread waiting for the user's response! After the user
// sees the explanation, try again to request the permission.
new AlertDialog.Builder(this)
.setTitle("Location Permission Needed")
.setMessage("This app needs the Location permission, please accept to use location functionality")
.setPositiveButton("OK", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialogInterface, int i) {
//Prompt the user once explanation has been shown
ActivityCompat.requestPermissions(MapsActivity.this,
new String[]{Manifest.permission.ACCESS_FINE_LOCATION},
MY_PERMISSIONS_REQUEST_LOCATION );
}
})
.create()
.show();
} else {
// No explanation needed, we can request the permission.
ActivityCompat.requestPermissions(this,
new String[]{Manifest.permission.ACCESS_FINE_LOCATION},
MY_PERMISSIONS_REQUEST_LOCATION );
}
}
}
@Override
public void onRequestPermissionsResult(int requestCode,
String permissions[], int[] grantResults) {
switch (requestCode) {
case MY_PERMISSIONS_REQUEST_LOCATION: {
// If request is cancelled, the result arrays are empty.
if (grantResults.length > 0
&& grantResults[0] == PackageManager.PERMISSION_GRANTED) {
// permission was granted, yay! Do the
// location-related task you need to do.
if (ContextCompat.checkSelfPermission(this,
Manifest.permission.ACCESS_FINE_LOCATION)
== PackageManager.PERMISSION_GRANTED) {
mFusedLocationClient.requestLocationUpdates(mLocationRequest, mLocationCallback, Looper.myLooper());
mGoogleMap.setMyLocationEnabled(true);
}
} else {
// permission denied, boo! Disable the
// functionality that depends on this permission.
Toast.makeText(this, "permission denied", Toast.LENGTH_LONG).show();
}
return;
}
// other 'case' lines to check for other
// permissions this app might request
}
}
}
The user will be prompted to accept the Location permission:
The location will be updated on app launch, and every two minutes:
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