这里SDK-栅格层不透明

Question

我正在使用此处的SDK的导航版进行Android。我正在添加自定义的栅格层，我的两个层是透明的（Lite Edition正确显示了这些图层），但是MapView显示了这些图层具有白色背景而不是透明的。这很糟糕，因为白色背景隐藏了基础地图。我是否缺少拥有透明层的东西？

这是我的代码：

    private RasterDataSource createRasterDataSource() {
    List<Integer> storageLevels = Arrays.asList(2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16);
    RasterDataSourceConfiguration.Provider rasterProviderConfig = new RasterDataSourceConfiguration.Provider(
            mTemplateUrl,
            TilingScheme.QUAD_TREE_MERCATOR,
            storageLevels);
    String path = "cache/raster/toner";
    long maxDiskSizeInBytes = 1024 * 1024 * 32;
    RasterDataSourceConfiguration.Cache cacheConfig = new RasterDataSourceConfiguration.Cache(path, maxDiskSizeInBytes);
    return new RasterDataSource(mMapView.getMapContext(),
            new RasterDataSourceConfiguration(mName, rasterProviderConfig, cacheConfig));
}

private MapLayer createMapLayer() {
    MapLayerPriority priority = new MapLayerPriorityBuilder()
            .renderedAfterLayer("ocm_cartography")
            .build();
    MapLayerVisibilityRange range = new MapLayerVisibilityRange(0, 22 + 1);
    try {
        MapLayer mapLayer = new MapLayerBuilder()
                .forMap(mMapView.getHereMap()) // mandatory parameter
                .withName(mName + "Layer") // mandatory parameter
                .withDataSource(mName, mMapContentType)
                .withPriority(priority)
                .withVisibilityRange(range)
                .build();
        return mapLayer;
    } catch (MapLayerBuilder.InstantiationException e) {
        throw new RuntimeException(e.getMessage());
    }
}

mmapContentType是mapconttype.raster_image

Answer 1

得到这里的支持（谢谢！），对于透明的层，我不得不为rasterdatasourceconfiguration.provider设置Hasalphachannel：

RasterDataSourceConfiguration.Provider rasterProviderConfig = new RasterDataSourceConfiguration.Provider(
            url,
            TilingScheme.QUAD_TREE_MERCATOR,
            storageLevels);
rasterProviderConfig.hasAlphaChannel = true;