如何仅根据最低位置精度更新位置

Posted 2023-04-14

【中文标题】如何仅根据最低位置精度更新位置

【英文标题】：How to only update location based on minimum location accuracy

【发布时间】：2019-10-28 09:42:52

【问题描述】：

我目前正在开发一个需要高精度位置更新的位置跟踪应用。 这是我的第一个应用程序，我可能会不知所措，但我正在学习。 我在使用 location.distanceTo() 时从 fusedLocationProviderClient 获得的准确度在每次更新（5 秒间隔）之间移动 15 到 70+ 米，同时以恒定的速度行走。 有没有办法提高精度或设置最小精度？

我在文档中找到了 getAccuracy() 和 hasAccuracy() 方法，但到目前为止我还没有理解如何使用这些方法来消除波动的准确性。

编辑：我遇到了将条件添加到我的位置代码的选项。 您能否提供一个示例，说明如何将其合并到我的代码中以获得始终如一的高精度？

或者，将我的代码更改为专门使用 LocationManager 和 GPS 卫星会更好吗？因为我的所有会话都是在外面完成的？

 @Override
    public void onMapReady(GoogleMap googleMap) 
        mGoogleMap = googleMap;
        mGoogleMap.setMapType(GoogleMap.MAP_TYPE_NORMAL);
        mGoogleMap.setMinZoomPreference(8.0f);
        mGoogleMap.setMaxZoomPreference(25.0f);

        mLocationRequest = new LocationRequest();
        mLocationRequest.setInterval(3000); 
        mLocationRequest.setFastestInterval(1000);
        mLocationRequest.setPriority(LocationRequest.PRIORITY_HIGH_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) 
            float zoomLevel = mGoogleMap.getCameraPosition().zoom;
            List<Location> locationList = locationResult.getLocations();

            System.out.println(workoutLocationList);
            if (locationList.size() > 0) 
                //The last location in the list is the newest
                Location location = locationList.get(locationList.size() - 1);
                Location lastLocation = location;

                locationList.add(location);
                workoutLocationList.add(location);
                if(workoutLocationList.size() > 1) 
                     lastLocation = workoutLocationList.get(workoutLocationList.size() - 2);
                
                System.out.println(workoutLocationList.size());
                for (Location i : workoutLocationList) 
                    System.out.println(i);
                
                System.out.println("current location is: "+ location);
                System.out.println("previous location is: "+ lastLocation);
                distanceBetweenLocations += location.distanceTo(lastLocation);
                workoutTotalDistance+= distanceBetweenLocations;
                System.out.println((int)distanceBetweenLocations);

                Log.i("MapsActivity", "Location: " + location.getLatitude() + " " + location.getLongitude());
                mLastLocation = location;
                if (mCurrLocationMarker != null) 
                    mCurrLocationMarker.remove();
                


                LatLng latLng = new LatLng(location.getLatitude(), location.getLongitude());

        

【参考方案1】：

试试这个

  if (ActivityCompat.checkSelfPermission(DriverMap.this, android.Manifest.permission.ACCESS_FINE_LOCATION)
            != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(
                    DriverMap.this, android.Manifest.permission.ACCESS_COARSE_LOCATION)
            != PackageManager.PERMISSION_GRANTED) 
        ActivityCompat.requestPermissions(DriverMap.this, new String[]android.Manifest.
                permission.ACCESS_FINE_LOCATION, 1);
     else 
        if (!mMap.isMyLocationEnabled())
           mMap.setMyLocationEnabled(true);

        LocationManager lm = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
        myLocation = lm.getLastKnownLocation(LocationManager.PASSIVE_PROVIDER);

        if (myLocation == null) 
            Criteria criteria = new Criteria();
            criteria.setAccuracy(Criteria.ACCURACY_COARSE);
            String provider = lm.getBestProvider(criteria, true);
            myLocation = lm.getLastKnownLocation(provider);
        

        if (myLocation != null) 
            latitude = myLocation.getLatitude();
            lonitude = myLocation.getLongitude();
            userLocation = new LatLng(latitude, lonitude);
              mMap.animateCamera(CameraUpdateFactory.newLatLngZoom(userLocation, 12), 1500, null);
             pos = mMap.addMarker(new MarkerOptions().position(userLocation).title("ur loc"));
             pos.setDraggable(true);
              pos.setIcon(BitmapDescriptorFactory.fromResource(R.drawable.car));
            mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(userLocation, 17));
        
    

【讨论】：

所以根据您的回答，我认为我的概念无法使用 fusedLocationProviderClient？如果我切换到 LocationManager，是否还需要 LocationCallback 方法？

您可以同时使用 yes 或 OnLocationChanged ，