Android-Maps-Extensions异步加载标记图像

我正在尝试将图像(从服务器下载)显示为Google Map上的地图标记.我使用Android-Maps-Extensions是因为我对Google Map-Utils的性能不满意.

现在,我想知道如何使用AME异步加载地图标记图像.如果图像不是群集,则任务是显示图像本身.
如果它是一个群集,我想显示第一个标记的图像和群集中元素的数量.

到目前为止,我已经完成了以下操作：

1)设置地图群集器

private void setupMapClusterer() {
    mClusterOptions = new EClusterOptionsProvider(getContext());
    ClusteringSettings clusteringSettings = new ClusteringSettings();
    clusteringSettings.addMarkersDynamically(true);
    clusteringSettings.clusterOptionsProvider(mClusterOptions);
    mMap.setClustering(clusteringSettings);
}

2)创建群集选项提供程序

public EClusterOptionsProvider(Context context) {
    mClusterOptions = new ClusterOptions();
    mContext = context;
    mIconGenerator = new IconGenerator(context);

    // Inflate Layout
    View markerView = LayoutInflater.from(context).inflate(R.layout.map_marker, null);
    mImageView = (ImageView) markerView.findViewById(R.id.map_marker_image);
    mTextView = (TextView) markerView.findViewById(R.id.map_marker_text);

    // Setup Icon Generator
    mIconGenerator.setContentView(markerView);
}

public Bitmap createIcon(Bitmap bmp, String text) {
    mImageView.setImageBitmap(bmp);
    mTextView.setText(text);
    return mIconGenerator.makeIcon();
}

@Override
public ClusterOptions getClusterOptions(List<Marker> list) {
    // Get Bitmap from first marker
    Marker first = list.get(0);
    mClusterOptions.icon(BitmapDescriptorFactory.fromBitmap(mIconGenerator.makeIcon()));
    return mClusterOptions;
}

这为我提供了一个地图,其中群集具有我的自定义视图(这是正确的),但是我不知道要在哪里下载图像以及如何将它们放入单个标记中,尤其是群集中.

当然,我不想提前下载所有图像(我们谈论的是500张)图像.

在sidenode上：我正在使用Volley异步dl图像.

解决方法:

我创建了一个使用集群和异步加载标记的简单示例.
希望您在这里找到一些有用的信息. https://github.com/pengrad/android-maps-async-markers

我们将使用Glide加载图标,我发现它比Picasso更稳定.
为要添加到地图的每个标记调用loadIconMarker.

MarkerOptions markerOptions = ...
// you should pass some icon before new loaded, or leave default one
//markerOptions.icon(BitmapDescriptorFactory.fromResource(R.drawable.default_marker));
Marker marker = mMap.addMarker(markerOptions);
loadMarkerIcon(marker);


private void loadMarkerIcon(final Marker marker) {
    Glide.with(this).load("http://www.myiconfinder.com/uploads/iconsets/256-256-a5485b563efc4511e0cd8bd04ad0fe9e.png")
            .asBitmap().fitCenter().into(new SimpleTarget<Bitmap>() {
        @Override
        public void onResourceReady(Bitmap bitmap, GlideAnimation<? super Bitmap> glideAnimation) {
            BitmapDescriptor icon = BitmapDescriptorFactory.fromBitmap(bitmap);
            marker.setIcon(icon);
        }
    });
}

创建ClusterIcon有点困难.这是我的ClusterOptionsProvider.
我使用基本位图R.drawable.m1并在其上添加表示簇中标记数量的文本.

public class ClusterIconProvider implements ClusterOptionsProvider {

    Resources resources;
    Paint paint;
    Bitmap base;

    public ClusterIconProvider(Resources resources) {
        this.resources = resources;

        paint = new Paint(Paint.ANTI_ALIAS_FLAG);
        paint.setColor(Color.WHITE);
        paint.setTextAlign(Paint.Align.CENTER);
        paint.setTextSize(15);

        base = BitmapFactory.decodeResource(resources, R.drawable.m1);
    }

    @Override
    public ClusterOptions getClusterOptions(List<Marker> list) {
        Bitmap bitmap = base.copy(Bitmap.Config.ARGB_8888, true);

        Rect bounds = new Rect();
        String text = String.valueOf(list.size());
        paint.getTextBounds(text, 0, text.length(), bounds);
        float x = bitmap.getWidth() / 2.0f;
        float y = (bitmap.getHeight() - bounds.height()) / 2.0f - bounds.top;

        Canvas canvas = new Canvas(bitmap);
        canvas.drawText(text, x, y, paint);
        BitmapDescriptor icon = BitmapDescriptorFactory.fromBitmap(bitmap);

        return new ClusterOptions().anchor(0.5f, 0.5f).icon(icon);
    }
}

标签：android-maps-v2,google-maps,google-maps-markers,android-maps-extensions,android
来源： https://codeday.me/bug/20191119/2038986.html