如何添加从服务器获取到Google Map Android的图像作为标记？

Question

请建议我

我正在获取图片的网址，需要将其放置在Google地图中作为标记

for(AtmInfo info :atmInfoList){
    //latitude   = Double.parseDouble(pub.getLatitude()) ;
    // longitude  =   Double.parseDouble(getIntent().getStringExtra("lon"));
    Marker source = mMap.addMarker(
                   new MarkerOptions()
        .position( 
            new LatLng(
                Double.parseDouble(info.getLatitude()), 
                Double.parseDouble(info.getLongitude())))
        .title(info.getBankName())
        .snippet(info.getBankAddress())    
        .icon(BitmapDescriptorFactory.fromResource(R.drawable.marker_green)));
}
mMap.setInfoWindowAdapter(new CustomInfoWindowAdapter());

Answer 1

首先，从URL获取图像。

其次，获取图像后，您可以使用叠加层在地图上添加自定义标记。

Answer 2

这是完整的解决方案。 像这样创建标记

Marker source = mMap.addMarker(
                   new MarkerOptions()
        .position( 
            new LatLng(
                Double.parseDouble(info.getLatitude()), 
                Double.parseDouble(info.getLongitude())))
        .title(info.getBankName())
        .snippet(info.getBankAddress())    
        .icon(BitmapDescriptorFactory.fromResource(getBitmap(url,this)))); //call getbitmap() method to download image from url 

从网址下载位图

在您的项目中添加方法getBitmap和解码方法（例如util类或通用函数）

public static Bitmap getBitmap(String url,Context context) 
    {
        FileCache fileCache=new FileCache(context);
        MemoryCache memoryCache=new MemoryCache();
        File f=fileCache.getFile(url);
        //from SD cache
        //CHECK : if trying to decode file which not exist in cache return null
        Bitmap b = decodeFile(f);
        if(b!=null)
            return b;
        // Download image file from web
        try {
            Bitmap bitmap=null;
            URL imageUrl = new URL(url);
            HttpURLConnection conn = (HttpURLConnection)imageUrl.openConnection();
            conn.setConnectTimeout(30000);
            conn.setReadTimeout(30000);
            conn.setInstanceFollowRedirects(true);
            InputStream is=conn.getInputStream();
            // Constructs a new FileOutputStream that writes to file
            // if file not exist then it will create file
            OutputStream os = new FileOutputStream(f);
            // See Utils class CopyStream method
            // It will each pixel from input stream and
            // write pixels to output stream (file)
            Utils.CopyStream(is, os);
            os.close();
            conn.disconnect();
            //Now file created and going to resize file with defined height
            // Decodes image and scales it to reduce memory consumption
            b = decodeFile(f);
            return bitmap;

        } catch (Throwable ex){
            ex.printStackTrace();
            if(ex instanceof OutOfMemoryError)
                memoryCache.clear();
            return null;
        }
    }

    //Decodes image and scales it to reduce memory consumption
    private static Bitmap decodeFile(File f){

        try {
            //Decode image size
            BitmapFactory.Options o = new BitmapFactory.Options();
            o.inJustDecodeBounds = true;
            FileInputStream stream1=new FileInputStream(f);
            BitmapFactory.decodeStream(stream1,null,o);
            stream1.close();
            //Find the correct scale value. It should be the power of 2.
            // Set width/height of recreated image
            final int REQUIRED_SIZE=85;
            int width_tmp=o.outWidth, height_tmp=o.outHeight;
            int scale=1;
            while(true){
                if(width_tmp/2<REQUIRED_SIZE || height_tmp/2<REQUIRED_SIZE)
                    break;
                width_tmp/=2;
                height_tmp/=2;
                scale*=2;
            }

            //decode with current scale values
            BitmapFactory.Options o2 = new BitmapFactory.Options();
            o2.inSampleSize=scale;
            FileInputStream stream2=new FileInputStream(f);
            Bitmap bitmap=BitmapFactory.decodeStream(stream2, null, o2);
            stream2.close();
            return bitmap;

        } catch (FileNotFoundException e) {
        } 
        catch (IOException e) {
            e.printStackTrace();
        }
        return null;
    }