更新Google地图上的位置

Question

I'm wondering what the best/suggested way to update my location on the map is. I'm trying to update my location once it changes and draw a line on the map for the route I've walked. I was thinking of using a thread who calls for my location method once every 5 sec (?) but I doubt this would be a recomended way to do this.

question: Best way to update my location on the map and how do I draw a route for the path I've taken.

If anyone could point me to the right direction I would highly appreciate that.

Answer 1

You can use this library. It's very useful and customize-able. You can set how frequently you want to get location. Just keep the reference of previous location. Define global instance of LocationTracker and then set it up like this.

private void setupLocationTracker() {
    TrackerSettings settings = new TrackerSettings()
            .setUseGPS(true)
            .setUseNetwork(true)
            .setUsePassive(true)
            .setTimeBetweenUpdates(1000 * 5)    //You can set it according to your needs
            .setMetersBetweenUpdates(10);    //Or you can set this too.
    if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED &&
            ActivityCompat.checkSelfPermission(this, 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;
    }
    locationTracker = new LocationTracker(this, settings) {
        @Override
        public void onLocationFound(@NonNull Location location) {
            LatLng currentLocation = new LatLng(location.getLatitude(), location.getLongitude());
            //if(latLngList.size() == 0) {
            mMap.addMarker(new MarkerOptions().position(currentLocation).title("Current Location"));
            mMap.animateCamera(CameraUpdateFactory.newLatLngZoom(currentLocation, 15.0f), 3000, null);
            //Write your function to draw line
            drawLine(previousLocation, currentLocation);
            previousLocation = currentLocation;
        }

        @Override
        public void onTimeout() {
            Log.d("MESSAGE", "Time out");
        }
    };
}

And then call locationTraker.startListening() and locationTracker.stopListening() whenever and wherever you want to. Just don't forget to call stopListening() inside onPause() .