我必须使用所有可用的传感器之一(例如WiFi,GPS,Data ECC)来实现一个函数,该函数返回用户的当前地理位置。
我在寻找有关它的信息,找到了几种解决方案,目前让我感兴趣的解决方案是使用"融合位置",但我没有找到指南或完整的使用示例。
这是我当前使用的代码:
public class LocationService extends Service {
private FusedLocationProviderClient mFusedLocationClient;
private SettingsClient mSettingsClient;
private LocationRequest mLocationRequest;
private LocationSettingsRequest mLocationSettingsRequest;
private LocationCallback mLocationCallback;
private Location mCurrentLocation;
private Boolean mRequestingLocationUpdates;
private WriteInLogFile wil = new WriteInLogFile();
@Override
public void onCreate() {
try {
DbGest db = DbGest.getInstance(getApplicationContext());
String deviceType = db.getSetting("deviceType");
long updateInterval;
if (deviceType.compareToIgnoreCase("smartphone") == 0) {
updateInterval = Long.parseLong(db.getSetting("pollGPSPhone"));
} else {
updateInterval = Long.parseLong(db.getSetting("pollGPSTablet"));
}
long updateInMillisecond = updateInterval / 2;
mLocationRequest = new LocationRequest();
mLocationRequest.setInterval(updateInterval);
mLocationRequest.setFastestInterval(updateInMillisecond);
mLocationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
mRequestingLocationUpdates = false;
mFusedLocationClient = LocationServices.getFusedLocationProviderClient(this);
mSettingsClient = LocationServices.getSettingsClient(this);
mLocationCallback = new LocationCallback() {
@Override
public void onLocationResult(LocationResult locationResult) {
super.onLocationResult(locationResult);
mCurrentLocation = locationResult.getLastLocation();
updateLocation();
}
};
LocationSettingsRequest.Builder builder = new LocationSettingsRequest.Builder();
builder.addLocationRequest(mLocationRequest);
builder.setNeedBle(true);
mLocationSettingsRequest = builder.build();
startLocationUpdates();
} catch (Exception e) {
wil.WriteFile("1)LocationService - Exception: " + e.toString());
}
}
public void startLocationUpdates() {
if (!mRequestingLocationUpdates) {
mRequestingLocationUpdates = true;
mSettingsClient.checkLocationSettings(mLocationSettingsRequest).addOnSuccessListener(new OnSuccessListener<LocationSettingsResponse>() {
@Override
public void onSuccess(LocationSettingsResponse locationSettingsResponse) {
if (ActivityCompat.checkSelfPermission(getApplicationContext(), Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(getApplicationContext(), Manifest.permission.ACCESS_COARSE_LOCATION) == PackageManager.PERMISSION_GRANTED) {
mFusedLocationClient.requestLocationUpdates(mLocationRequest, mLocationCallback, Looper.myLooper());
}
}
}).addOnFailureListener(new OnFailureListener() {
@Override
public void onFailure(@NonNull Exception e) {
wil.WriteFile("2)LocationService - Exception: " + e.toString());
}
});
}
}
private void stopLocationUpdates() {
if (!mRequestingLocationUpdates) {
return;
}
mFusedLocationClient.removeLocationUpdates(mLocationCallback).addOnCompleteListener(new OnCompleteListener<Void>() {
@Override
public void onComplete(@NonNull Task<Void> task) {
mRequestingLocationUpdates = false;
}
});
}
private void updateLocation() {
if (mCurrentLocation != null) {
DbGest.getInstance(getApplicationContext()).insertIntoLastPositionKnown(mCurrentLocation, getApplicationContext());
}
}
@Override
public void onDestroy() {
super.onDestroy();
stopLocationUpdates();
}
@Override
public IBinder onBind(Intent intent) {
return null;
} }
如果我通过Wi-Fi连接到网络,则代码工作在这种情况下都可以很好地工作,但是当我切换3G时,出现错误时:
com.google.android.gms.common.api.resolvablepiexception:6: Resolution_required
在gradle中:
compile 'com.google.android.gms:play-services-gcm:11.6.2'
compile 'com.google.android.gms:play-services-vision:11.6.2'
compile 'com.google.android.gms:play-services-location:11.6.2'
compile 'com.google.android.gms:play-services-maps:11.6.2'
我不知道解决这个问题...
获得位置可能会有一些时间,我建议在后台处理它会使体验更加顺畅。检查您是否获得了许可,并且在应用程序中已启用了权限。如果您需要进一步的帮助,请发布日志。我已经尝试了此代码,并且可以正常工作!
private void getUserLocation() {
FusedLocationProviderClient mFusedLocationClient = LocationServices.getFusedLocationProviderClient(this);
if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED) {
mFusedLocationClient.getLastLocation()
.addOnSuccessListener(new OnSuccessListener<Location>() {
@Override
public void onSuccess(Location location) {
if (location != null) {
latitude = location.getLatitude();
longitude = location.getLongitude();
}
}
});
}
}
捕获相同错误的任何人:当您致电
时会出现 new LocationSettingsRequest.Builder().addLocationRequest(mLocationRequest);
或
LocationSettingsRequest.Builder builder = new LocationSettingsRequest.Builder();
builder.addLocationRequest(mLocationRequest);
解决方案 - 不要致电.addlocationRequest(...)当我在添加请求的同时,我在builder.addLocationRequest
和task = client.checkLocationSettings(builder.build())
的同时致电时发生了此错误。请参阅https://developer.android.com/training/location/change-location-settings#get-settings