How do I get the current GPS location programmatically in Android?

Question

I need to get my current location using GPS programmatically. How can i achieve it?

Answer 1

April 2020

Full steps to get current location, and avoid Last Known Location nullability.

According to official documentation, Last Known Location could be Null in case of:

• Location is turned off in the device settings. As it clears the cache.
• The device never recorded its location. (New device)
• Google Play services on the device has restarted.

In this case, you should requestLocationUpdates and receive the new location on the LocationCallback.

By the following steps your last known Location never null.

---

Pre-requisite: EasyPermission library

---

Step 1: In manifest file add this permission

---

Step 2:

    override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    setContentView(R.layout.activity_main)

    //Create location callback when it's ready.
    createLocationCallback()

    //createing location request, how mant request would be requested.
    createLocationRequest()

    //Build check request location setting request
    buildLocationSettingsRequest()

    //FusedLocationApiClient which includes location 
    mFusedLocationClient = LocationServices.getFusedLocationProviderClient(this)
    //Location setting client
    mSettingsClient = LocationServices.getSettingsClient(this)

    //Check if you have ACCESS_FINE_LOCATION permission
    if (!EasyPermissions.hasPermissions(
            this@MainActivity,
            Manifest.permission.ACCESS_FINE_LOCATION)) {
        requestPermissionsRequired()
    }
    else{
        //If you have the permission we should check location is opened or not
        checkLocationIsTurnedOn()
    }

}

---

Step 3: Create required functions to be called in onCreate()

private fun requestPermissionsRequired() {
    EasyPermissions.requestPermissions(
        this,
        getString(R.string.location_is_required_msg),
        LOCATION_REQUEST,
        Manifest.permission.ACCESS_FINE_LOCATION
    )
}

private fun createLocationCallback() {
    //Here the location will be updated, when we could access the location we got result on this callback.
    mLocationCallback = object : LocationCallback() {
        override fun onLocationResult(locationResult: LocationResult) {
            super.onLocationResult(locationResult)
            mCurrentLocation = locationResult.lastLocation
        }
    }
}

private fun buildLocationSettingsRequest() {
    val builder = LocationSettingsRequest.Builder()
    builder.addLocationRequest(mLocationRequest!!)
    mLocationSettingsRequest = builder.build()
    builder.setAlwaysShow(true)
}

private fun createLocationRequest() {
    mLocationRequest = LocationRequest.create()
    mLocationRequest!!.interval = 0
    mLocationRequest!!.fastestInterval = 0
    mLocationRequest!!.numUpdates = 1
    mLocationRequest!!.priority = LocationRequest.PRIORITY_HIGH_ACCURACY
}

public fun checkLocationIsTurnedOn() { // Begin by checking if the device has the necessary location settings.
    mSettingsClient!!.checkLocationSettings(mLocationSettingsRequest)
        .addOnSuccessListener(this) {
            Log.i(TAG, "All location settings are satisfied.")
            startLocationUpdates()
        }
        .addOnFailureListener(this) { e ->
            val statusCode = (e as ApiException).statusCode
            when (statusCode) {
                LocationSettingsStatusCodes.RESOLUTION_REQUIRED -> {
                    try {
                        val rae = e as ResolvableApiException
                        rae.startResolutionForResult(this@MainActivity, LOCATION_IS_OPENED_CODE)
                    } catch (sie: IntentSender.SendIntentException) {
                    }
                }
                LocationSettingsStatusCodes.SETTINGS_CHANGE_UNAVAILABLE -> {
                    mRequestingLocationUpdates = false
                }
            }
        }
}

private fun startLocationUpdates() {
    mFusedLocationClient!!.requestLocationUpdates(
        mLocationRequest,
        mLocationCallback, null
    )
}

---

Step 4:

Handle callbacks in onActivityResult() after ensuring the location is opened or the user accepts to open it in.

override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
    super.onActivityResult(requestCode, resultCode, data)
    when (requestCode) {
        LOCATION_IS_OPENED_CODE -> {
            if (resultCode == AppCompatActivity.RESULT_OK) {
                Log.d(TAG, "Location result is OK")
            } else {
                activity?.finish()
            }
        }
}

---

Step 5: Get last known location from FusedClientApi

override fun onMapReady(map: GoogleMap) {
    mMap = map
    mFusedLocationClient.lastLocation.addOnSuccessListener {
        if(it!=null){
            locateUserInMap(it)
        }
    }

}
   private fun locateUserInMap(location: Location) {
    showLocationSafetyInformation()
    if(mMap!=null){
        val currentLocation = LatLng(location.latitude,location.longitude )
        addMarker(currentLocation)
    }
}


private fun addMarker(currentLocation: LatLng) {
    val cameraUpdate = CameraUpdateFactory.newLatLng(currentLocation)
    mMap?.clear()
    mMap?.addMarker(
        MarkerOptions().position(currentLocation)
            .title("Current Location")
    )
    mMap?.moveCamera(cameraUpdate)
    mMap?.animateCamera(cameraUpdate)
    mMap?.setMinZoomPreference(14.0f);
}

I hope this would help.

Happy Coding