Skip to main content

View annotations - animation

Add view annotation to a point annotation.

There are several ways to add markers, annotations, and other shapes to the map using the Maps SDK. To choose the appropriate approach for your application, read the Markers and annotations guide.

ViewAnnotationAnimationActivity.kt
package com.mapbox.maps.testapp.examples.markersandcallouts.viewannotation

import android.animation.Animator
import android.animation.AnimatorListenerAdapter
import android.animation.TypeEvaluator
import android.animation.ValueAnimator
import android.animation.ValueAnimator.AnimatorUpdateListener
import android.graphics.Color
import android.os.Bundle
import android.view.View
import android.widget.TextView
import androidx.appcompat.app.AppCompatActivity
import com.mapbox.geojson.FeatureCollection
import com.mapbox.geojson.LineString
import com.mapbox.geojson.Point
import com.mapbox.maps.CameraOptions
import com.mapbox.maps.MapView
import com.mapbox.maps.Style
import com.mapbox.maps.ViewAnnotationOptions
import com.mapbox.maps.extension.style.layers.generated.lineLayer
import com.mapbox.maps.extension.style.sources.generated.geoJsonSource
import com.mapbox.maps.extension.style.style
import com.mapbox.maps.testapp.R
import com.mapbox.maps.testapp.databinding.ItemCalloutViewBinding
import com.mapbox.maps.testapp.examples.annotation.AnnotationUtils
import com.mapbox.maps.viewannotation.ViewAnnotationManager
import com.mapbox.maps.viewannotation.geometry
import com.mapbox.turf.TurfConstants.UNIT_DEFAULT
import com.mapbox.turf.TurfMeasurement
import kotlin.math.roundToLong

/**
* Example how to animate a view annotations on top of a route.
*/
class ViewAnnotationAnimationActivity : AppCompatActivity() {

private lateinit var viewAnnotationManager: ViewAnnotationManager
private lateinit var annotationView: View
private lateinit var textView: TextView
private var routeCoordinateList = mutableListOf<Point>()
private var currentRouteCoordinate = 0
private var totalLength = 0.0
private var currentAnimator: Animator? = null

override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
val mapView = MapView(this)
setContentView(mapView)

// load feature collection from assets file
val featureCollection = FeatureCollection.fromJson(
AnnotationUtils.loadStringFromAssets(
this, ROUTE_FILE_NAME
)!!
)

// calculate the route length, get coordinates from route geometry
val lineString = featureCollection.features()!![0].geometry() as LineString
routeCoordinateList = lineString.coordinates()
totalLength = TurfMeasurement.length(lineString, UNIT_DEFAULT)

// initialize the mapview
mapView.mapboxMap.apply {
loadStyle(
style(Style.LIGHT) {
// source for displaying the route
+geoJsonSource(SOURCE_ID) {
featureCollection(featureCollection)
}
// layer for displaying the route
+lineLayer(LINE_ID, SOURCE_ID) {
lineColor(Color.parseColor(COLOR_PINK_HEX))
lineWidth(4.0)
}
}
) {
// center camera around SF airport
setCamera(
CameraOptions.Builder()
.center(Point.fromLngLat(-122.3915, 37.6177))
.zoom(11.0)
.build()
)
// get initial point
val initialPoint = routeCoordinateList[0]

// create view annotation callout item
viewAnnotationManager = mapView.viewAnnotationManager
annotationView = viewAnnotationManager.addViewAnnotation(
R.layout.item_callout_view,
ViewAnnotationOptions.Builder()
.geometry(initialPoint)
.build()
)

ItemCalloutViewBinding.bind(annotationView).apply {
textView = textNativeView
}

animateNextStep()
}
}
}

override fun onStop() {
super.onStop()
currentAnimator?.removeAllListeners()
currentAnimator?.cancel()
}

private fun animateNextStep() {
currentRouteCoordinate %= (routeCoordinateList.size - 1)
val currentPoint = routeCoordinateList[currentRouteCoordinate]
val nextPoint = routeCoordinateList[currentRouteCoordinate + 1]

val progress = TurfMeasurement.distance(currentPoint, nextPoint) / totalLength
val animateDuration = progress * ANIMATION_DURATION_TOTAL_MS
currentAnimator = ValueAnimator.ofObject(pointEvaluator, currentPoint, nextPoint).apply {
duration = animateDuration.roundToLong()
addUpdateListener(animatorUpdateListener)
addListener(object : AnimatorListenerAdapter() {
override fun onAnimationEnd(animation: Animator) {
super.onAnimationEnd(animation)
currentRouteCoordinate++
animateNextStep()
}
})
start()
}
}

private val animatorUpdateListener =
AnimatorUpdateListener { valueAnimator ->
val animatedPosition: Point = valueAnimator.animatedValue as Point
viewAnnotationManager.updateViewAnnotation(
annotationView,
ViewAnnotationOptions.Builder().geometry(animatedPosition).build()
)
textView.text = "lat=%.4f\nlon=%.4f".format(
animatedPosition.latitude(),
animatedPosition.longitude()
)
}

private val pointEvaluator: TypeEvaluator<Point> =
TypeEvaluator<Point> { fraction, startValue, endValue ->
Point.fromLngLat(
(
startValue.longitude() +
((endValue.longitude() - startValue.longitude()) * fraction)
),
startValue.latitude() +
(endValue.latitude() - startValue.latitude()) * fraction
)
}

private companion object {
const val LINE_ID = "line"
const val SOURCE_ID = "source"
const val COLOR_PINK_HEX = "#F13C6E"
const val ANIMATION_DURATION_TOTAL_MS = 50000
const val ROUTE_FILE_NAME = "sf_airport_route.geojson"
}
}
Was this example helpful?