Android 中的 osm 地图中出现未知标记

Question

我正在使用 Open Street View Maps 创建一个 Android 应用程序。我正在使用下面的库。

    implementation 'org.osmdroid:osmdroid-android:6.0.2'

我也在使用集群机制对集群中的标记进行分组。为此，我正在使用下面的奖励包库。

    implementation 'com.github.MKergall:osmbonuspack:6.5.2'

到目前为止一切正常。我有自己的集群图标和标记图标。下面是相同的代码

private void populateMarkers(final List<Datum> datumList) {
    if (datumList != null) {
        CustomMarkerClusterer poiMarkers = new CustomMarkerClusterer(this);
        map.getOverlays().add(poiMarkers);
        for (int i = 0; i < datumList.size(); i++) {
            Marker marker = new Marker(map);
            marker.setPosition(new GeoPoint(Double.parseDouble(datumList.get(i).getLat()), Double.parseDouble(datumList.get(i).getLng())));
            Drawable currentDraw = ResourcesCompat.getDrawable(getResources(), R.drawable.location_marker, null);

            marker.setIcon(currentDraw);
            final int finalI = i;
            marker.setOnMarkerClickListener((marker1, mapView) -> {
                if (marker1.isInfoWindowShown()) {
                    InfoWindow.closeAllInfoWindowsOn(mapView);
                } else {
                    mapView.getController().animateTo(new GeoPoint(marker1.getPosition().getLatitude(), marker1.getPosition().getLongitude()));
                    getMarkerDetails(marker1, datumList.get(finalI).getId());

                }
                return false;
            });

            poiMarkers.add(marker);
            poiMarkers.setRadius(300);
            poiMarkers.getTextPaint().setColor(Color.BLACK);

            map.invalidate();
        }
    }

    progressDialog.dismiss();
}

现在的问题是，当我放大查看集群中的标记时，地图上出现了未知类型的标记。未知我的意思是我没有为那种类型的标记编写任何代码，我的项目中也没有那种标记图标图像。

我目前不知道那个标记图标出现在哪里。看截图

查看屏幕截图中的绿色手形图标。我问的是那个图标。这个东西既不可点击也不会在点击时显示任何信息窗口，而我在标记点击时打开了一个信息窗口。

CustomMarkerClusterer class 代码

public class CustomMarkerClusterer extends MarkerClusterer {

private int mMaxClusteringZoomLevel = 17;
private int mRadiusInPixels = 100;
private double mRadiusInMeters;
private Paint mTextPaint;
private ArrayList<Marker> mClonedMarkers;
private Context context;
private long firstClick;
private long lastClick;
private int count;
/**
 * cluster icon anchor
 */
public float mAnchorU = Marker.ANCHOR_CENTER, mAnchorV = Marker.ANCHOR_CENTER;
/**
 * anchor point to draw the number of markers inside the cluster icon
 */
public float mTextAnchorU = Marker.ANCHOR_CENTER, mTextAnchorV = Marker.ANCHOR_CENTER;

public CustomMarkerClusterer(Context ctx) {
    super();
    mTextPaint = new Paint();
    mTextPaint.setColor(Color.BLACK);
    mTextPaint.setTextSize(15 * ctx.getResources().getDisplayMetrics().density);
    mTextPaint.setFakeBoldText(true);
    mTextPaint.setTextAlign(Paint.Align.CENTER);
    mTextPaint.setAntiAlias(true);
    this.context = ctx;
    Drawable clusterIconD = ctx.getResources().getDrawable(R.drawable.cluster2);
    Bitmap clusterIcon = ((BitmapDrawable) clusterIconD).getBitmap();
    setIcon(clusterIcon);
}

/**
 * If you want to change the default text paint (color, size, font)
 */
public Paint getTextPaint() {
    return mTextPaint;
}

/**
 * Set the radius of clustering in pixels. Default is 100px.
 */
public void setRadius(int radius) {
    mRadiusInPixels = radius;
}

/**
 * Set max zoom level with clustering. When zoom is higher or equal to this level, clustering is disabled.
 * You can put a high value to disable this feature.
 */
public void setMaxClusteringZoomLevel(int zoom) {
    mMaxClusteringZoomLevel = zoom;
}

/**
 * Radius-Based clustering algorithm
 */
@Override
public ArrayList<StaticCluster> clusterer(MapView mapView) {

    ArrayList<StaticCluster> clusters = new ArrayList<StaticCluster>();
    convertRadiusToMeters(mapView);

    mClonedMarkers = new ArrayList<Marker>(mItems); //shallow copy
    while (!mClonedMarkers.isEmpty()) {
        Marker m = mClonedMarkers.get(0);
        m.setIcon(context.getResources().getDrawable(R.drawable.location_marker));
        StaticCluster cluster = createCluster(m, mapView);
        clusters.add(cluster);
    }
    return clusters;
}

private StaticCluster createCluster(Marker m, MapView mapView) {
    GeoPoint clusterPosition = m.getPosition();

    StaticCluster cluster = new StaticCluster(clusterPosition);
    cluster.add(m);

    mClonedMarkers.remove(m);

    if (mapView.getZoomLevel() > mMaxClusteringZoomLevel) {
        //above max level => block clustering:
        return cluster;
    }

    Iterator<Marker> it = mClonedMarkers.iterator();
    while (it.hasNext()) {
        Marker neighbour = it.next();
        double distance = clusterPosition.distanceToAsDouble(neighbour.getPosition());
        if (distance <= mRadiusInMeters) {
            cluster.add(neighbour);
            it.remove();
        }
    }

    return cluster;
}

@Override
public Marker buildClusterMarker(StaticCluster cluster, MapView mapView) {

    Marker m = new Marker(mapView);
    m.setPosition(cluster.getPosition());
    m.setInfoWindow(null);
    m.setAnchor(mAnchorU, mAnchorV);
    Bitmap mutableBitmap=null;

    if (cluster.getSize() < 10) {
        Bitmap icon = Bitmap.createBitmap(((BitmapDrawable) context.getResources().getDrawable(R.drawable.cluster1)).getBitmap());
        mutableBitmap = icon.copy(Bitmap.Config.ARGB_8888, true);

        Canvas iconCanvas = new Canvas(mutableBitmap);
       // iconCanvas.drawBitmap(mClusterIcon, 0, 0, null);
        String text = "" + cluster.getSize();
        int textHeight = (int) (mTextPaint.descent() + mTextPaint.ascent());
        iconCanvas.drawText(text,
                mTextAnchorU * icon.getWidth(),
                mTextAnchorV * icon.getHeight() - textHeight / 2,
                mTextPaint);
        m.setIcon(new BitmapDrawable(mapView.getContext().getResources(), mutableBitmap));
    } else if (cluster.getSize() > 10 && cluster.getSize() < 100) {
        Bitmap icon = Bitmap.createBitmap(((BitmapDrawable) context.getResources().getDrawable(R.drawable.cluster3)).getBitmap());
        mutableBitmap = icon.copy(Bitmap.Config.ARGB_8888, true);
        Canvas iconCanvas = new Canvas(mutableBitmap);
        //iconCanvas.drawBitmap(mClusterIcon, 0, 0, null);
        String text = "" + cluster.getSize();
        int textHeight = (int) (mTextPaint.descent() + mTextPaint.ascent());
        iconCanvas.drawText(text,
                mTextAnchorU * icon.getWidth(),
                mTextAnchorV * icon.getHeight() - textHeight / 2,
                mTextPaint);
        m.setIcon(new BitmapDrawable(mapView.getContext().getResources(), mutableBitmap));
    } else if (cluster.getSize() > 100) {
        Bitmap icon = Bitmap.createBitmap(((BitmapDrawable) context.getResources().getDrawable(R.drawable.cluster2)).getBitmap());
        mutableBitmap = icon.copy(Bitmap.Config.ARGB_8888, true);
        Canvas iconCanvas = new Canvas(mutableBitmap);
        //iconCanvas.drawBitmap(mClusterIcon, 0, 0, null);
        String text = "" + cluster.getSize();
        int textHeight = (int) (mTextPaint.descent() + mTextPaint.ascent());
        iconCanvas.drawText(text,
                mTextAnchorU * icon.getWidth(),
                mTextAnchorV * icon.getHeight() - textHeight / 2,
                mTextPaint);
        m.setIcon(new BitmapDrawable(mapView.getContext().getResources(), mutableBitmap));

    }
    m.setOnMarkerClickListener(new Marker.OnMarkerClickListener() {
        @Override
        public boolean onMarkerClick(Marker marker, MapView mapView) {
            mapView.getController().setZoom(mapView.getZoomLevelDouble()+2);

            return true;
        }
    });
   // m.setIcon(new BitmapDrawable(mapView.getContext().getResources(), mutableBitmap));

    return m;
}

@Override
public void renderer(ArrayList<StaticCluster> clusters, Canvas canvas, MapView mapView) {
    for (StaticCluster cluster : clusters) {
        if (cluster.getSize() == 1) {
            //cluster has only 1 marker => use it as it is:
            cluster.setMarker(cluster.getItem(0));
        } else {
            //only draw 1 Marker at Cluster center, displaying number of Markers contained
            Marker m = buildClusterMarker(cluster, mapView);
            cluster.setMarker(m);
        }
    }
}

private void convertRadiusToMeters(MapView mapView) {

    Rect mScreenRect = mapView.getIntrinsicScreenRect(null);

    int screenWidth = mScreenRect.right - mScreenRect.left;
    int screenHeight = mScreenRect.bottom - mScreenRect.top;

    BoundingBox bb = mapView.getBoundingBox();

    double diagonalInMeters = bb.getDiagonalLengthInMeters();
    double diagonalInPixels = Math.sqrt(screenWidth * screenWidth + screenHeight * screenHeight);
    double metersInPixel = diagonalInMeters / diagonalInPixels;

    mRadiusInMeters = mRadiusInPixels * metersInPixel;
}

}

Answer 1

您的 buildClusterMarker 有问题：看看当簇大小为 = 10 或 = 100 时会发生什么：两种情况下都没有 "if"。所以 m.setIcon 没有被调用，你仍然有默认的 osmdroid 标记图标：这个有趣的 "green color hand icon"。

顺便说一句，为什么你复制整个 RadiusMarkerClusterer 代码，当你可以从它继承并（正确地）实现你自己的 buildClusterMarker ???永远不应该做的事情的完美例子。

Android 中的 osm 地图中出现未知标记

Unknown marker appearing in osm maps in Android

android

osmdroid

osmbonuspack