我正在使用Fused location Api，我的位置精度约为10米。有时它可以提供4到8米的精度。我希望使用这个融合位置Api或任何其他方式更准确。有没有办法获得精度低于4米的位置。
我正以这种方式获得位置。
public class GetCurrentLocation implements
ConnectionCallbacks, OnConnectionFailedListener, LocationListener {
private static final String TAG = "location-updates-sample";
public static final long UPDATE_INTERVAL_IN_MILLISECONDS = 0;
public static final long FASTEST_UPDATE_INTERVAL_IN_MILLISECONDS =
UPDATE_INTERVAL_IN_MILLISECONDS / 2;
private final String REQUESTING_LOCATION_UPDATES_KEY = "requesting-location-updates-key";
private final String LOCATION_KEY = "location-key";
private final String LAST_UPDATED_TIME_STRING_KEY = "last-updated-time-string-key";
private GoogleApiClient mGoogleApiClient;
private LocationRequest mLocationRequest;
private Context mContext;
private getLocation mGetCurrentLocation;
public GetCurrentLocation(Context context) {
mContext = context;
buildGoogleApiClient();
}
private synchronized void buildGoogleApiClient() {
Log.i(TAG, "Building GoogleApiClient");
mGoogleApiClient = new GoogleApiClient.Builder(mContext)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.addApi(LocationServices.API)
.build();
createLocationRequest();
}
public interface getLocation{
public void onLocationChanged(Location location);
}
public void startGettingLocation(getLocation location) {
mGetCurrentLocation = location;
connect();
}
public void stopGettingLocation() {
stopLocationUpdates();
disconnect();
}
private void createLocationRequest() {
mLocationRequest = new LocationRequest();
mLocationRequest.setInterval(UPDATE_INTERVAL_IN_MILLISECONDS);
mLocationRequest.setFastestInterval(FASTEST_UPDATE_INTERVAL_IN_MILLISECONDS);
mLocationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
}
private void startLocationUpdates() {
if (mGoogleApiClient.isConnected()) {
LocationServices.FusedLocationApi.requestLocationUpdates(
mGoogleApiClient, mLocationRequest, this);
}
}
private void stopLocationUpdates() {
LocationServices.FusedLocationApi.removeLocationUpdates(mGoogleApiClient, this);
}
private void connect() {
mGoogleApiClient.connect();
}
private void disconnect() {
if (mGoogleApiClient.isConnected()) {
mGoogleApiClient.disconnect();
}
}
@Override
public void onConnected(Bundle connectionHint) {
Log.i(TAG, "Connected to GoogleApiClient");
startLocationUpdates();
}
@Override
public void onLocationChanged(Location location) {
mGetCurrentLocation.onLocationChanged(location);
}
@Override
public void onConnectionSuspended(int cause) {
Log.i(TAG, "Connection suspended");
mGoogleApiClient.connect();
}
@Override
public void onConnectionFailed(ConnectionResult result) {
Log.i(TAG, "Connection failed: ConnectionResult.getErrorCode() = " + result.getErrorCode());
}
}
我在我的活动代码中使用了这个类。
private GetCurrentLocation mListen;
mListen = new GetCurrentLocation(this);
mListen.startGettingLocation(new GetCurrentLocation.getLocation() {
@Override
public void onLocationChanged(Location location) {
// Here is my working with location object
}
});
如何优化此代码以获得准确的位置。 感谢。
答案 0 :(得分：5)
位置准确性基于GPS /网络提供商，您只能等待并从中获取位置。
您可以再次确定准确度
@Override
public void onLocationChanged(Location location) {
int suitableMeter = 20; // adjust your need
if (location.hasAccuracy() && location.getAccuracy() <= suitableMeter) {
// This is your most accurate location.
}
}
答案 1 :(得分：1)
2019年最佳官方解决方案
已弃用Google API Client / FusedLocationApi，并且位置管理器根本没有用。 因此Google首选使用Google Play服务位置API的融合位置提供商 “ FusedLocationProviderClientClient” 用于获取位置及其更好的节电和准确性的方式
以下是Kotlin中的示例代码，用于获取最近的已知位置/一次性位置（等于当前位置）
// declare a global variable of FusedLocationProviderClient
private lateinit var fusedLocationClient: FusedLocationProviderClient
// in onCreate() initialize FusedLocationProviderClient
fusedLocationClient = LocationServices.getFusedLocationProviderClient(context!!)
/**
* call this method for receive location
* get location and give callback when successfully retrieve
* function itself check location permission before access related methods
*
*/
fun getLastKnownLocation() {
fusedLocationClient.lastLocation
.addOnSuccessListener { location->
if (location != null) {
// use your location object
// get latitude , longitude and other info from this
}
}
}
如果您的应用可以连续跟踪位置，则您必须接收“接收位置更新”
检查样品中的kotlin
// declare a global variable FusedLocationProviderClient
private lateinit var fusedLocationClient: FusedLocationProviderClient
// in onCreate() initialize FusedLocationProviderClient
fusedLocationClient = LocationServices.getFusedLocationProviderClient(context!!)
// globally declare LocationRequest
private lateinit var locationRequest: LocationRequest
// globally declare LocationCallback
private lateinit var locationCallback: LocationCallback
/**
* call this method in onCreate
* onLocationResult call when location is changed
*/
private fun getLocationUpdates()
{
fusedLocationClient = LocationServices.getFusedLocationProviderClient(context!!)
locationRequest = LocationRequest()
locationRequest.interval = 50000
locationRequest.fastestInterval = 50000
locationRequest.smallestDisplacement = 170f // 170 m = 0.1 mile
locationRequest.priority = LocationRequest.PRIORITY_HIGH_ACCURACY //set according to your app function
locationCallback = object : LocationCallback() {
override fun onLocationResult(locationResult: LocationResult?) {
locationResult ?: return
if (locationResult.locations.isNotEmpty()) {
// latest location is on 0th index
val location =
LatLng(locationResult.locations[0].latitude, locationResult.locations[0].longitude)
// use your location object
// get latitude , longitude and other info from this
}
}
}
}
//start location updates
private fun startLocationUpdates() {
fusedLocationClient.requestLocationUpdates(
locationRequest,
locationCallback,
null /* Looper */
)
}
// stop location updates
private fun stopLocationUpdates() {
fusedLocationClient.removeLocationUpdates(locationCallback)
}
// stop receiving location update when activity not visible/foreground
override fun onPause() {
super.onPause()
stopLocationUpdates()
}
// start receiving location update when activity visible/foreground
override fun onResume() {
super.onResume()
startLocationUpdates()
}
确保您注意Mainfaist权限和位置的运行时权限
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
并为Gradle添加
implementation 'com.google.android.gms:play-services-location:17.0.0'
有关更多详细信息，请遵循以下官方文件
https://developer.android.com/training/location/retrieve-current
https://developer.android.com/training/location/receive-location-updates