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pengdevpengdev
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Initial prototype.
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‎app/src/main/AndroidManifest.xml

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android:name="android.support.PARENT_ACTIVITY"
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android:value=".ExampleOverviewActivity" />
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</activity>
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<activity
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android:name=".examples.CustomLocationProviderActivity"
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android:description="@string/description_custom_location_provider"
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android:exported="true"
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android:label="@string/activity_custom_location_provider">
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<meta-data
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android:name="@string/category"
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android:value="@string/category_location" />
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<meta-data
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android:name="android.support.PARENT_ACTIVITY"
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android:value=".ExampleOverviewActivity" />
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</activity>
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<activity
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android:name=".TestMapActivity"
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android:exported="true" />

‎app/src/main/java/com/mapbox/maps/testapp/examples/CustomLocationProviderActivity.kt

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package com.mapbox.maps.testapp.examples
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import android.annotation.SuppressLint
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import android.os.Bundle
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import android.view.ViewGroup
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import android.widget.Button
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import androidx.appcompat.app.AppCompatActivity
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import com.mapbox.geojson.Point
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import com.mapbox.maps.CameraOptions
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import com.mapbox.maps.MapView
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import com.mapbox.maps.Style
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import com.mapbox.maps.plugin.LocationPuck3D
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import com.mapbox.maps.plugin.gestures.OnMapClickListener
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import com.mapbox.maps.plugin.gestures.gestures
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import com.mapbox.maps.plugin.locationcomponent.CustomLocationProvider
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import com.mapbox.maps.plugin.locationcomponent.location2
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/**
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* Example of using custom location provider.
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*/
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class CustomLocationProviderActivity : AppCompatActivity(), OnMapClickListener {
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private val customLocationProvider = CustomLocationProvider()
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private lateinit var mapView: MapView
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@SuppressLint("SetTextI18n")
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override fun onCreate(savedInstanceState: Bundle?) {
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super.onCreate(savedInstanceState)
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mapView = MapView(this)
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setContentView(mapView)
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mapView.addView(
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Button(this).apply {
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layoutParams = ViewGroup.LayoutParams(
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ViewGroup.LayoutParams.WRAP_CONTENT,
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ViewGroup.LayoutParams.WRAP_CONTENT
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)
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text = "Cancel"
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setOnClickListener {
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customLocationProvider.cancelPlayback()
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}
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}
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)
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mapView.getMapboxMap()
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.apply {
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setCamera(
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CameraOptions.Builder()
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.center(HELSINKI)
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.pitch(40.0)
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.zoom(14.0)
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.build()
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)
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loadStyleUri(Style.MAPBOX_STREETS) {
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initLocationComponent()
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initClickListeners()
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customLocationProvider.startPlayback()
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}
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}
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}
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private fun initClickListeners() {
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mapView.gestures.addOnMapClickListener(this)
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}
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private fun initLocationComponent() {
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val locationComponentPlugin2 = mapView.location2
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locationComponentPlugin2.setLocationProvider(customLocationProvider)
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locationComponentPlugin2.let {
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it.locationPuck = LocationPuck3D(
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modelUri = "asset://sportcar.glb",
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modelScale = listOf(0.1f, 0.1f, 0.1f),
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modelTranslation = listOf(0.1f, 0.1f, 0.1f),
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modelRotation = listOf(0.0f, 0.0f, 180.0f)
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)
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}
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locationComponentPlugin2.enabled = true
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locationComponentPlugin2.puckBearingEnabled = true
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}
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override fun onMapClick(point: Point): Boolean {
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customLocationProvider.queueLocationUpdate(point)
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return true
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}
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companion object {
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private val HELSINKI = Point.fromLngLat(24.9384, 60.1699)
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}
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}

‎app/src/main/res/values/example_descriptions.xml

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<string name="description_info_window">Legacy InfoWindow implementation using view annotations</string>
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<string name="description_viewport">Viewport camera showcase</string>
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<string name="description_advanced_viewport">Advanced viewport with gestures showcase</string>
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<string name="description_custom_location_provider">Showcase usage of custom location provider.</string>
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</resources>

‎app/src/main/res/values/example_titles.xml

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<string name="activity_info_window">View annotation as InfoWindow</string>
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<string name="activity_viewport">Viewport camera</string>
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<string name="activity_advanced_viewport">Advanced Viewport with gestures</string>
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<string name="activity_custom_location_provider">Custom location provider</string>
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</resources>

‎plugin-locationcomponent/src/main/java/com/mapbox/maps/plugin/locationcomponent/CustomLocationProvider.kt

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package com.mapbox.maps.plugin.locationcomponent
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import android.os.Handler
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import android.os.Looper
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import android.view.animation.LinearInterpolator
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import com.mapbox.geojson.Point
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import com.mapbox.maps.MapboxExperimental
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import java.util.concurrent.ConcurrentLinkedQueue
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import java.util.concurrent.CopyOnWriteArraySet
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import kotlin.math.*
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/**
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* A custom location provider implementation that allows to play location updates at constant speed.
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*/
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@MapboxExperimental
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class CustomLocationProvider : LocationProvider {
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private var locationConsumers = CopyOnWriteArraySet<LocationConsumer>()
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private var bearingAnimateDuration = 100L
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private var isPlaying = false
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private val handler = Handler(Looper.getMainLooper())
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private val locationList = ConcurrentLinkedQueue<Triple<Point, Double, Long>>()
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private var lastLocation: Point? = null
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/**
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* Playback speed in m/s.
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*/
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var speed = 60.0
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/**
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* Return the remaining locations in the queue.
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*/
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val remainingLocationsInQueue: List<Point>
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get() {
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with(locationList) {
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return this.map { it.first }
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}
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}
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/**
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* Queue a list of geo locations to be played at constant speed.
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*/
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fun queueLocationUpdates(locations: List<Point>) {
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locations.forEach {
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queueLocationUpdate(it)
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}
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}
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/**
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* Queue a new location update event to be played at constant speed.
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*/
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fun queueLocationUpdate(
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location: Point
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) {
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val bearing = (locationList.lastOrNull()?.first ?: lastLocation)?.let {
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bearing(it, location)
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} ?: 0.0
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val animationDurationMs = (locationList.lastOrNull()?.first ?: lastLocation)?.let {
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(distanceInMeter(it, location) / speed) * 1000.0
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} ?: 1000L
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locationList.add(Triple(location, bearing, animationDurationMs.toLong()))
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if (locationList.size == 1 && isPlaying) {
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drainQueue()
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}
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}
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/**
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* Start the playback, any incoming location updates will be queued and played sequentially.
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*/
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fun startPlayback() {
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isPlaying = true
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}
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/**
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* Cancel any ongoing playback, new incoming location updates will be queued but not played.
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*/
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fun pausePlayback() {
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isPlaying = false
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handler.removeCallbacksAndMessages(null)
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}
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/**
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* Cancel any ongoing playback and clear remaining location queue.
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* New incoming location updates will be queued but not played.
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*/
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fun cancelPlayback() {
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isPlaying = false
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locationList.clear()
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handler.removeCallbacksAndMessages(null)
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}
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private fun drainQueue() {
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locationList.peek()?.let {
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emitLocationUpdated(it.first, it.second, it.third) {
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lastLocation = locationList.poll()?.first
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drainQueue()
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}
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}
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}
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private fun emitLocationUpdated(
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location: Point,
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bearing: Double,
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animationDuration: Long,
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finished: () -> Unit
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) {
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locationConsumers.forEach {
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it.onBearingUpdated(bearing) {
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duration = bearingAnimateDuration
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}
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it.onLocationUpdated(location) {
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duration = animationDuration
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interpolator = LinearInterpolator()
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}
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}
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handler.postDelayed(finished, animationDuration)
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}
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override fun registerLocationConsumer(locationConsumer: LocationConsumer) {
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this.locationConsumers.add(locationConsumer)
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}
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override fun unRegisterLocationConsumer(locationConsumer: LocationConsumer) {
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this.locationConsumers.remove(locationConsumer)
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}
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private companion object {
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/**
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* Takes two [Point] and finds the geographic bearing between them.
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*
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* @param point1 first point used for calculating the bearing
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* @param point2 second point used for calculating the bearing
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* @return bearing in decimal degrees
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*/
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fun bearing(point1: Point, point2: Point): Double {
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val lon1: Double = degreesToRadians(point1.longitude())
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val lon2: Double = degreesToRadians(point2.longitude())
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val lat1: Double = degreesToRadians(point1.latitude())
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val lat2: Double = degreesToRadians(point2.latitude())
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val value1 = sin(lon2 - lon1) * cos(lat2)
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val value2 = cos(lat1) * sin(lat2) - (sin(lat1) * cos(lat2) * cos(lon2 - lon1))
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return radiansToDegrees(atan2(value1, value2))
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}
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fun radiansToDegrees(radians: Double): Double {
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val degrees = radians % (2 * Math.PI)
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return degrees * 180 / Math.PI
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}
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fun degreesToRadians(degrees: Double): Double {
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val radians = degrees % 360
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return radians * Math.PI / 180
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}
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fun distanceInMeter(point1: Point, point2: Point): Double {
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val radius = 6370000.0
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val lat = degreesToRadians(point2.latitude() - point1.latitude())
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val lon = degreesToRadians(point2.longitude() - point1.longitude())
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val a = sin(lat / 2) * sin(lat / 2) + cos(degreesToRadians(point1.latitude())) * cos(
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degreesToRadians(point2.latitude())
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) * sin(lon / 2) * sin(lon / 2)
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val c = 2 * atan2(sqrt(a), sqrt(1 - a))
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return abs(radius * c)
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}
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}
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}

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