android - onLocationChanged 在每个时间间隔调用两次

Question

我正在编写一个基于位置的 Android 应用程序，我在其中应用位置监听器来捕获 GPS 坐标、速度和覆盖距离。问题是我的“onLocationChanged”回调函数在每个时间间隔被调用两次，导致将值相加 2 次而不是 1 次。这是我的 onLocationChanged 代码:

@Override
public void onLocationChanged(Location location) {

/*    currentLatitude = location.getLatitude();
    currentLongitude = location.getLongitude();

    driverLoc.setDriver_latitude(currentLatitude);
    driverLoc.setDriver_longitude(currentLongitude);

    Toast.makeText(this, currentLatitude + " WORKS " + currentLongitude + "" + (location.getSpeed() * 3.6f), Toast.LENGTH_LONG).show();
*/
    latitude = location.getLatitude();
    longitude = location.getLongitude();

    driverLoc.setDriver_latitude(latitude);
    driverLoc.setDriver_longitude(longitude);

    long elapsedMillis = SystemClock.elapsedRealtime();
    //Toast.makeText(JourneyStartActivity.this, "Elapsed milliseconds: " + (elapsedMillis/1000),
    //      Toast.LENGTH_SHORT).show();

    long Milis = previousMiliSecs;

    previousMiliSecs = elapsedMillis;

    int hours = (int) (elapsedMillis / 3600000);
    int minutes = (int) (elapsedMillis - hours * 3600000) / 60000;

    long secs = TimeUnit.MILLISECONDS.toSeconds((previousMiliSecs - Milis));

    long currentMilis = previousMiliSecs - Milis;

    if( location.getAccuracy() <=10  && (previousMiliSecs - Milis) >= 10000) {

        Location temp = mCurrentLocation;

        mCurrentLocation = location;

        float[] fArr;
        fArr = new float[3];

        double distance = mCurrentLocation.distanceTo(temp);

        //location.distanceBetween(temp.getLatitude(), temp.getLongitude(), mCurrentLocation.getLatitude(), mCurrentLocation.getLongitude(), fArr);

        //double distance = getDistanceFromLatLonInKm(temp.getLatitude(), temp.getLongitude(), mCurrentLocation.getLatitude(), mCurrentLocation.getLongitude());
        //double distance = fArr[0];

        float journeySpeed = (location.getSpeed() * 3.6f);
       //float journeySpeed = (float) ((distance / 10.0f) * 3.6f);
        //journeySpeed *= 3.6f;

        if (GPSTracker.inJourney) {
            journey.setTotalDistanceCovered(distance);
            journey.setJourneySpeedIntervals(journeySpeed);
        }
/*
    TextView txt = (TextView) ((Activity) mContext).findViewById(R.id.textView38);
    txt.setText(String.valueOf(journey.getTotalDistanceCovered()));
*/
        //Log.e("Home GPS Update","Lat: " + latitude + " Long: " + longitude + " Speed: " + journeySpeed + " Distance: " + journey.getTotalDistanceCovered());
        Log.e("Home GPS Update", "Lat: " + latitude + " Long: " + longitude + " Speed: " + journeySpeed + " Distance: " + journey.getTotalDistanceCovered() + " Accuracy: " + location.getAccuracy() + " Seconds: " + secs);
    }
}

自从过去 3 天以来，我一直卡在这里，请帮帮我...

这是我设置 Google API 客户端的代码:

@Override
public void onConnected(Bundle bundle) {

    if (ActivityCompat.checkSelfPermission(this, android.Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, android.Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
        // TODO: Consider calling
        //    ActivityCompat#requestPermissions
        // here to request the missing permissions, and then overriding
        //   public void onRequestPermissionsResult(int requestCode, String[] permissions,
        //                                          int[] grantResults)
        // to handle the case where the user grants the permission. See the documentation
        // for ActivityCompat#requestPermissions for more details.
        return;
    }

    mLocationRequest = LocationRequest.create();
    mLocationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
    mLocationRequest.setSmallestDisplacement(0);
    mLocationRequest.setInterval(1 * 10000);        // 10 seconds, in milliseconds
    mLocationRequest.setFastestInterval(1 * 10000); // 10 second, in milliseconds

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

    Location location = LocationServices.FusedLocationApi.getLastLocation(mGoogleApiClient);

    if (location == null) {
        LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient, mLocationRequest, this);
    } else {
        //If everything went fine lets get latitude and longitude
        currentLatitude = location.getLatitude();
        currentLongitude = location.getLongitude();

        driverLoc.setDriverLocation(location);

        driverLoc.setDriver_latitude(currentLatitude);
        driverLoc.setDriver_longitude(currentLongitude);

        //Toast.makeText(this, "Latitude: "+driverLoc.getDriver_latitude() + " Longitude: "+driverLoc.getDriver_longitude(), Toast.LENGTH_LONG).show();
    }
}


10-31 15:38:07.854 21996-21996/amidtech.android.optimusdrive E/Home GPS Update: Lat: 24.833515 Long: 67.0378417 Speed: 0.0 Distance: 0.0 Accuracy: 4.8 Seconds: 14
10-31 15:38:07.855 21996-21996/amidtech.android.optimusdrive E/Home GPS Update: Lat: 24.833515 Long: 67.0378417 Speed: 0.0 Distance: 0.0 Accuracy: 4.8 Seconds: 14
10-31 15:38:17.856 21996-21996/amidtech.android.optimusdrive E/Home GPS Update: Lat: 24.833515 Long: 67.0378417 Speed: 0.0 Distance: 0.0 Accuracy: 4.8 Seconds: 10
10-31 15:38:17.858 21996-21996/amidtech.android.optimusdrive E/Home GPS Update: Lat: 24.833515 Long: 67.0378417 Speed: 0.0 Distance: 0.0 Accuracy: 4.8 Seconds: 10
10-31 15:38:32.853 21996-21996/amidtech.android.optimusdrive E/Home GPS Update: Lat: 24.833515 Long: 67.0378417 Speed: 0.0 Distance: 0.0 Accuracy: 4.9 Seconds: 14
10-31 15:38:32.854 21996-21996/amidtech.android.optimusdrive E/Home GPS Update: Lat: 24.833515 Long: 67.0378417 Speed: 0.0 Distance: 0.0 Accuracy: 4.9 Seconds: 14

Answer 1

检查您是否注册了两次相同的回调，也许这就是问题所在。您两次添加相同的监听器:

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

    Location location = LocationServices.FusedLocationApi.getLastLocation(mGoogleApiClient);

    if (location == null) {
        LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient, mLocationRequest, this);
    } else { ...

位置管理器没有缓存值，第一次返回 null。此时您再次注册同一个监听器。你应该忽略第一个空值