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Line manager won't show lines

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#1,155 2 comments 0 reactions 0 assignees View on GitHub

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Assessment

Difficulty
4/5
Estimated time
3-5 days
Newbie friendliness
32/100
Issue type
Bug
Clarity
Mostly clear
Activity status
Stale
Tech stack
android, kotlin
Domain
mobile-dev

Research direction

Start by reproducing the report through addOrEditRouteLines, first with LineManager and then with GeoJsonSource and LineLayer, on Android 6.0–7.0. Observe the brief appearance and disappearance after updating the source; done means route lines remain visible after updates, including when the data changes.

Written by the indexing model from the issue text.

Description

On Android 6.0 - Android 7.0 (I've tested on those versions) the lines are not displayed.

On Android 10.0 lines are normally showed with exact same implementation as on Android 6.0 - Android 7.0 (not sure for 8.0 - 10.0 versions).

 lineManager = LineManager(map, this, style).apply {
        lineCap = Property.LINE_CAP_ROUND
 }

 points.map { line ->
        val lineOptions = LineOptions()
            .withLineColor(linesColor)
            .withLineWidth(3f)
            .withGeometry(
                LineString.fromLngLats(line.map { Point.fromLngLat(it.longitude, it.latitude) })
            )
        lines.add(lineManager.create(lineOptions))
 }

Then I've just noticed that the line appeared for a brief second and then disappeared.

Then I tried with a different approach:
I tried adding GeoJsonSource and LineLayer. Lines are shown, but when I update GeoJsonSource with different data, lines are hidden again 👎 When I load the exact same data as previously into GeoJsonSource, lines are shown again.

This is also happening on Android 6.0 - Android 7.0

fun addOrEditRouteLines(style: Style?, color: String, data: List<List<LatLng>>) {
    with(style ?: return) {
        (sources.find { it.id == DEFAULT_LAYER_LINES } as? GeoJsonSource)?.apply {
            (getLayer(DEFAULT_LAYER_LINES) as LineLayer).apply {
                withProperties(PropertyFactory.lineColor(color))
            }
        
        clearLines(style)
            setGeoJson(
                fromFeatures(
                    data.map { line ->
                        Feature.fromGeometry(
                            LineString.fromLngLats(line.map { Point.fromLngLat(it.longitude, it.latitude) })
                        )
                    }
                )
            )
            return
        }
        val routeLines = GeoJsonSource(
            DEFAULT_LAYER_LINES,
                fromFeatures(
                    data.map { line ->
                        Feature.fromGeometry(
                            LineString.fromLngLats(line.map { Point.fromLngLat(it.longitude, it.latitude) })
                        )
                    }
                )
        )
        addSource(routeLines)

        addLayer(
            LineLayer(DEFAULT_LAYER_LINES, DEFAULT_LAYER_LINES).withProperties(
                    PropertyFactory.lineWidth(3f),
                    PropertyFactory.lineColor(color),
                    PropertyFactory.lineCap(Property.LINE_CAP_ROUND)
            )
        )
    }
}
Dominant language
Java
Stars
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Forks
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