Xây dựng Car Location Tracking cho Android với Firebase

implementation 'com.google.android.gms:play-services-location:15.0.1'
implementation 'com.google.android.gms:play-services-maps:15.0.1'
implementation 'com.google.firebase:firebase-database:16.0.1'

<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />

<meta-data
    android:name="com.google.android.gms.version"
    android:value="@integer/google_play_services_version" />

<meta-data
    android:name="com.google.android.geo.API_KEY"
    android:value="@string/map_api_key" /> // Change it with your Google Maps API key.

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <FrameLayout
        android:id="@+id/driverStatusLayout"
        android:layout_width="match_parent"
        android:layout_height="50dp"
        android:background="@color/colorPrimary"
        android:orientation="horizontal">

        <TextView
            android:id="@+id/driverStatusTextView"
            android:layout_width="wrap_content"
            android:layout_height="match_parent"
            android:layout_marginStart="15dp"
            android:gravity="center"
            android:text="@string/offline"
            android:textColor="@color/colorIcons"
            android:textSize="22sp" />

       <android.support.v7.widget.SwitchCompat
           android:id="@+id/driverStatusSwitch"
           android:layout_width="wrap_content"
           android:layout_height="match_parent"
           android:layout_gravity="end"
           android:layout_marginEnd="15dp"
           android:checked="false"
           android:theme="@style/SCBSwitch" />

      </FrameLayout>

      <fragment
          android:id="@+id/supportMap"
          android:name="com.google.android.gms.maps.SupportMapFragment"
          android:layout_width="match_parent"
          android:layout_height="match_parent"
          android:layout_below="@+id/driverStatusLayout"
tools:context="spartons.com.frisbeeGo.fragments.MapFragment" />

</RelativeLayout>

class MainActivity : AppCompatActivity() {

    companion object {
        private const val MY_PERMISSIONS_REQUEST_ACCESS_FINE_LOCATION = 2200
    }

    private lateinit var googleMap: GoogleMap
    private lateinit var locationProviderClient: FusedLocationProviderClient
    private lateinit var locationRequest: LocationRequest
    private lateinit var locationCallback: LocationCallback
    private var locationFlag = true
    private var driverOnlineFlag = false
    private var currentPositionMarker: Marker? = null
    private val googleMapHelper = GoogleMapHelper()
    private val firebaseHelper = FirebaseHelper("0000")
    private val markerAnimationHelper = MarkerAnimationHelper()
    private val uiHelper = UiHelper()

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        val mapFragment: SupportMapFragment = supportFragmentManager.findFragmentById(R.id.supportMap) as SupportMapFragment
        mapFragment.getMapAsync { googleMap = it }
        createLocationCallback()
        locationProviderClient = LocationServices.getFusedLocationProviderClient(this)
        locationRequest = uiHelper.getLocationRequest()
        if (!uiHelper.isPlayServicesAvailable(this)) {
            Toast.makeText(this, "Play Services did not installed!", Toast.LENGTH_SHORT).show()
            finish()
        } else requestLocationUpdate()
        val driverStatusTextView = findViewById<TextView>(R.id.driverStatusTextView)
        findViewById<SwitchCompat>(R.id.driverStatusSwitch).setOnCheckedChangeListener { _, b ->
            driverOnlineFlag = b
            if (driverOnlineFlag) driverStatusTextView.text = resources.getString(R.string.online_driver)
            else {
                driverStatusTextView.text = resources.getString(R.string.offline)
                firebaseHelper.deleteDriver()
            }
        }
    }

    @SuppressLint("MissingPermission")
    private fun requestLocationUpdate() {
        if (!uiHelper.isHaveLocationPermission(this)) {
            ActivityCompat.requestPermissions(this, arrayOf(Manifest.permission.ACCESS_FINE_LOCATION), MY_PERMISSIONS_REQUEST_ACCESS_FINE_LOCATION)
            return
        }
        if (uiHelper.isLocationProviderEnabled(this))
            uiHelper.showPositiveDialogWithListener(this, resources.getString(R.string.need_location), resources.getString(R.string.location_content), object : IPositiveNegativeListener {
                override fun onPositive() {
startActivity(Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS))
                }
            }, "Turn On", false)
locationProviderClient.requestLocationUpdates(locationRequest, locationCallback, Looper.myLooper())
    }

    private fun createLocationCallback() {
        locationCallback = object : LocationCallback() {
            override fun onLocationResult(locationResult: LocationResult?) {
               super.onLocationResult(locationResult)
               if (locationResult!!.lastLocation == null) return
               val latLng = LatLng(locationResult.lastLocation.latitude, locationResult.lastLocation.longitude)
               Log.e("Location", latLng.latitude.toString() + " , " + latLng.longitude)
               if (locationFlag) {
                   locationFlag = false
                   animateCamera(latLng)
               }
               if (driverOnlineFlag) firebaseHelper.updateDriver(Driver(lat = latLng.latitude, lng = latLng.longitude))
               showOrAnimateMarker(latLng)
           }
       }
   }

   private fun showOrAnimateMarker(latLng: LatLng) {
       if (currentPositionMarker == null)
           currentPositionMarker = googleMap.addMarker(googleMapHelper.getDriverMarkerOptions(latLng))
       else markerAnimationHelper.animateMarkerToGB(currentPositionMarker!!, latLng, LatLngInterpolator.Spherical())
   }

   private fun animateCamera(latLng: LatLng) {
       val cameraUpdate = googleMapHelper.buildCameraUpdate(latLng)
       googleMap.animateCamera(cameraUpdate, 10, null)
   }

   override fun onRequestPermissionsResult(requestCode: Int, permissions: Array<out String>, grantResults: IntArray) {
       super.onRequestPermissionsResult(requestCode, permissions, grantResults)
       if (requestCode == MY_PERMISSIONS_REQUEST_ACCESS_FINE_LOCATION) {
           val value = grantResults[0]
           if (value == PERMISSION_DENIED) {
               Toast.makeText(this, "Location Permission denied", Toast.LENGTH_SHORT).show()
               finish()
           } else if (value == PERMISSION_GRANTED) requestLocationUpdate()
       }
    }
}

class UiHelper {

    fun isPlayServicesAvailable(context: Context): Boolean {
        val googleApiAvailability = GoogleApiAvailability.getInstance()
        val status = googleApiAvailability.isGooglePlayServicesAvailable(context)
        return ConnectionResult.SUCCESS == status
    }

    fun isHaveLocationPermission(context: Context): Boolean {
        return Build.VERSION.SDK_INT < Build.VERSION_CODES.M || ActivityCompat.checkSelfPermission(context, android.Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED || ActivityCompat.checkSelfPermission(context, android.Manifest.permission.ACCESS_COARSE_LOCATION) == PackageManager.PERMISSION_GRANTED
    }

    fun isLocationProviderEnabled(context: Context): Boolean {
        val locationManager = context.getSystemService(Context.LOCATION_SERVICE) as LocationManager
        return !locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER) && !locationManager.isProviderEnabled(LocationManager.NETWORK_PROVIDER)
    }

    fun showPositiveDialogWithListener(callingClassContext: Context, title: String, content: String, positiveNegativeListener: IPositiveNegativeListener, positiveText: String, cancelable: Boolean) {
        buildDialog(callingClassContext, title, content)
                .builder
                .positiveText(positiveText)
                .positiveColor(getColor(R.color.colorPrimary, callingClassContext))
                .onPositive { _, _ -> positiveNegativeListener.onPositive() }
                .cancelable(cancelable)
                .show()
    }

    private fun buildDialog(callingClassContext: Context, title: String, content: String): MaterialDialog {
         return MaterialDialog.Builder(callingClassContext)
                 .title(title)
                 .content(content)
                 .build()
    }


    private fun getColor(color: Int, context: Context): Int {
        return ContextCompat.getColor(context, color)
    }

    fun getLocationRequest() : LocationRequest {
        val locationRequest = LocationRequest.create()
        locationRequest.priority = LocationRequest.PRIORITY_HIGH_ACCURACY
        locationRequest.interval = 3000
        return locationRequest
    }
}

class GoogleMapHelper {

    companion object {
        private const val ZOOM_LEVEL = 18
        private const val TILT_LEVEL = 25
    }

    /**
     * @param latLng in which position to Zoom the camera.
     * @return the [CameraUpdate] with Zoom and Tilt level added with the given position.
     */

    fun buildCameraUpdate(latLng: LatLng): CameraUpdate {
        val cameraPosition = CameraPosition.Builder()
                .target(latLng)
                .tilt(TILT_LEVEL.toFloat())
                .zoom(ZOOM_LEVEL.toFloat())
                .build()
        return CameraUpdateFactory.newCameraPosition(cameraPosition)
    }

    /**
     * @param position where to draw the [com.google.android.gms.maps.model.Marker]
     * @return the [MarkerOptions] with given properties added to it.
     */

    fun getDriverMarkerOptions(position: LatLng): MarkerOptions {
        val options = getMarkerOptions(R.drawable.car_icon, position)
        options.flat(true)
        return options
    }

    private fun getMarkerOptions(resource: Int, position: LatLng): MarkerOptions {
        return MarkerOptions()

 .icon(BitmapDescriptorFactory.fromResource(resource))
                 .position(position)
    }
}

class MarkerAnimationHelper {

    fun animateMarkerToGB(marker: Marker, finalPosition: LatLng, latLngInterpolator: LatLngInterpolator) {
        val startPosition = marker.position
        val handler = Handler()
        val start = SystemClock.uptimeMillis()
        val interpolator = AccelerateDecelerateInterpolator()
        val durationInMs = 2000f
        handler.post(object : Runnable {
            var elapsed: Long = 0
            var t: Float = 0.toFloat()
            var v: Float = 0.toFloat()
            override fun run() {
                // Calculate progress using interpolator
                elapsed = SystemClock.uptimeMillis() - start
                t = elapsed / durationInMs
                v = interpolator.getInterpolation(t)
                marker.position = latLngInterpolator.interpolate(v, startPosition, finalPosition)
                // Repeat till progress is complete.
                if (t < 1) {
                    // Post again 16ms later.
                    handler.postDelayed(this, 16)
                }
            }
        })
    }
}

class FirebaseHelper constructor(driverId: String) {

    companion object {
        private const val ONLINE_DRIVERS = "online_drivers"
    }

    private val onlineDriverDatabaseReference: DatabaseReference = FirebaseDatabase
            .getInstance()
            .reference
            .child(ONLINE_DRIVERS)
            .child(driverId)

    init {
        onlineDriverDatabaseReference
                .onDisconnect()
                .removeValue()
    }

    fun updateDriver(driver: Driver) {
        onlineDriverDatabaseReference
                .setValue(driver)
        Log.e("Driver Info", " Updated")
    }

    fun deleteDriver() {
        onlineDriverDatabaseReference
               .removeValue()
    }
}

data class Driver(val lat: Double, val lng: Double, val driverId: String = "0000")