用于计算位置的 Gps 和网络状态在建筑物内不准确

Question

位置管理器没有提供建筑物内准确的位置数据，并且很难同时处理 gps 和网络状态。对于这个问题，是否有任何解决方案可以比 this.i 想在出租车计价器应用程序中使用它更好地计算精确数据。

public Location getLocation() {
        try {
            mLocationManager = (LocationManager) context.getSystemService(LOCATION_SERVICE);

            // getting GPS status
            boolean isGPSEnabled = mLocationManager.isProviderEnabled(LocationManager.GPS_PROVIDER);

            // getting network status
            boolean isNetworkEnabled = mLocationManager.isProviderEnabled(LocationManager.NETWORK_PROVIDER);

            if (!isGPSEnabled && !isNetworkEnabled) {
                // no network provider is enabled
            } else {
                // First get location from Network Provider
                if (isNetworkEnabled) {
                    mLocationManager.requestLocationUpdates( LocationManager.NETWORK_PROVIDER,  MIN_TIME_BW_UPDATES,  MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
                    Log.d("Network", "Network");
                    if (mLocationManager != null) {
                        location = mLocationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
                        if (location != null) {
                            lat = location.getLatitude();
                            lng = location.getLongitude();
                        }
                    }
                }
                //get the location by gps
                if (isGPSEnabled) {
                    if (location == null) {
                        mLocationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER,MIN_TIME_BW_UPDATES,MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
                        Log.d("GPS Enabled", "GPS Enabled");
                        if (mLocationManager != null) {location = mLocationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
                            if (location != null) {
                                lat = location.getLatitude();
                                lng = location.getLongitude();
                            }
                        }
                    }
                }
            }

        } catch (Exception e) {
            e.printStackTrace();
        }

        return location;
    }

Answer 1

使用 google 开发人员开发的融合 API 融合 GPS 传感器、磁力计、加速度计，还可以使用 Wifi 或小区定位来计算或估计位置。它还能够准确地提供建筑物内的位置更新。

package com.example.ashis.gpslocation;

import android.app.Activity;
import android.location.Location;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.widget.TextView;
import android.widget.Toast;

import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.GooglePlayServicesUtil;
import com.google.android.gms.common.api.GoogleApiClient;
import com.google.android.gms.common.api.GoogleApiClient.ConnectionCallbacks;
import com.google.android.gms.common.api.GoogleApiClient.OnConnectionFailedListener;
import com.google.android.gms.location.LocationListener;
import com.google.android.gms.location.LocationRequest;
import com.google.android.gms.location.LocationServices;

import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;

/**
 * Location sample.
 *
 * Demonstrates use of the Location API to retrieve the last known location for a device.
 * This sample uses Google Play services (GoogleApiClient) but does not need to authenticate a user.
 * See https://github.com/googlesamples/android-google-accounts/tree/master/QuickStart if you are
 * also using APIs that need authentication.
 */

public class MainActivity extends Activity implements LocationListener,
        GoogleApiClient.ConnectionCallbacks,
        GoogleApiClient.OnConnectionFailedListener {

    private static final long ONE_MIN = 500;
    private static final long TWO_MIN = 500;
    private static final long FIVE_MIN = 500;
    private static final long POLLING_FREQ = 1000 * 20;
    private static final long FASTEST_UPDATE_FREQ = 1000 * 5;
    private static final float MIN_ACCURACY = 1.0f;
    private static final float MIN_LAST_READ_ACCURACY = 1;

    private LocationRequest mLocationRequest;
    private Location mBestReading;
TextView tv;
    private GoogleApiClient mGoogleApiClient;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        if (!servicesAvailable()) {
            finish();
        }

        setContentView(R.layout.activity_main);
tv= (TextView) findViewById(R.id.tv1);
        mLocationRequest = LocationRequest.create();
        mLocationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
        mLocationRequest.setInterval(POLLING_FREQ);
        mLocationRequest.setFastestInterval(FASTEST_UPDATE_FREQ);

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


        if (mGoogleApiClient != null) {
            mGoogleApiClient.connect();
        }
    }

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

        if (mGoogleApiClient != null) {
            mGoogleApiClient.connect();
        }
    }

    @Override
    protected void onPause() {d
        super.onPause();

        if (mGoogleApiClient != null && mGoogleApiClient.isConnected()) {
            mGoogleApiClient.disconnect();
        }
    }


        tv.setText(location + "");
        // Determine whether new location is better than current best
        // estimate
        if (null == mBestReading || location.getAccuracy() < mBestReading.getAccuracy()) {
            mBestReading = location;


            if (mBestReading.getAccuracy() < MIN_ACCURACY) {
                LocationServices.FusedLocationApi.removeLocationUpdates(mGoogleApiClient, this);
            }
        }
    }

    @Override
    public void onConnected(Bundle dataBundle) {
        // Get first reading. Get additional location updates if necessary
        if (servicesAvailable()) {

            // Get best last location measurement meeting criteria
            mBestReading = bestLastKnownLocation(MIN_LAST_READ_ACCURACY, FIVE_MIN);

            if (null == mBestReading
                    || mBestReading.getAccuracy() > MIN_LAST_READ_ACCURACY
                    || mBestReading.getTime() < System.currentTimeMillis() - TWO_MIN) {

                LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient, mLocationRequest, this);

               //Schedule a runnable to unregister location listeners

                    @Override
                    public void run() {
                        LocationServices.FusedLocationApi.removeLocationUpdates(mGoogleApiClient, MainActivity.this);

                    }

                }, ONE_MIN, TimeUnit.MILLISECONDS);

            }

        }
    }

    @Override
    public void onConnectionSuspended(int i) {

    }


    private Location bestLastKnownLocation(float minAccuracy, long minTime) {
        Location bestResult = null;
        float bestAccuracy = Float.MAX_VALUE;
        long bestTime = Long.MIN_VALUE;

        // Get the best most recent location currently available
        Location mCurrentLocation = LocationServices.FusedLocationApi.getLastLocation(mGoogleApiClient);
        //tv.setText(mCurrentLocation+"");
        if (mCurrentLocation != null) {
            float accuracy = mCurrentLocation.getAccuracy();
            long time = mCurrentLocation.getTime();

            if (accuracy < bestAccuracy) {
                bestResult = mCurrentLocation;
                bestAccuracy = accuracy;
                bestTime = time;
            }
        }

        // Return best reading or null
        if (bestAccuracy > minAccuracy || bestTime < minTime) {
            return null;
        }
        else {
            return bestResult;
        }
    }

    @Override
    public void onConnectionFailed(ConnectionResult connectionResult) {

    }

    private boolean servicesAvailable() {
        int resultCode = GooglePlayServicesUtil.isGooglePlayServicesAvailable(this);

        if (ConnectionResult.SUCCESS == resultCode) {
            return true;
        }
        else {
            GooglePlayServicesUtil.getErrorDialog(resultCode, this, 0).show();
            return false;
        }
    }
}

用于计算位置的 Gps 和网络状态在建筑物内不准确

Gps and Network state to calculate location is not accurate inside buildings

android

gps

locationmanager

fusion