如何从网络加载图像作为 android 中的标记图标？

Question

我需要从 URL 为标记加载图像。在从 URL 加载图像之前，我需要显示默认值 image.And 我的地图页面将如下所示：

标记背景图片为白色，其中的图标（例如：包和汽车）将来自网络URL。

我已通过使用 BitmapDescriptorFactory.fromBitmap 创建标记获得相关输出。

 if (isAdded()) {
            marker = googleMap.addMarker(new MarkerOptions().icon(BitmapDescriptorFactory.fromBitmap(createDrawableFromView(setMarkerFromlayout(result, false, false), 200, 200)))
                    .position(pinLocation)
                    .title(parser.mapLocationList.get(pos).location_id)
                    .snippet("")
            );
        }
public static Bitmap createDrawableFromView(View v, int requestedWidth, int requestedHeight) {
    // Because the view is never shown it does not have a size, but if shown don't resize it.
    if (v.getMeasuredHeight() <= 0) {

        // You may want to change these lines according to the behavior you need.
        int specWidth = View.MeasureSpec.makeMeasureSpec(requestedWidth, View.MeasureSpec.AT_MOST);
        int specHeight = View.MeasureSpec.makeMeasureSpec(requestedHeight, View.MeasureSpec.AT_MOST);
        v.measure(specWidth, specHeight);
    }
    Bitmap b = Bitmap.createBitmap(v.getMeasuredWidth(), v.getMeasuredHeight(), Bitmap.Config.ARGB_8888);
    Canvas c = new Canvas(b);
    v.layout(0, 0, v.getMeasuredWidth(), v.getMeasuredHeight());
    v.draw(c);
    return b;
}


private RelativeLayout setMarkerFromlayout(Bitmap resultImage, boolean isClickable, boolean isFirst) {

    LayoutInflater inflater = (LayoutInflater) getActivity().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    View view = inflater.inflate(R.layout.layout_map_custom_icon, null);
    RelativeLayout layoutIcon = (RelativeLayout) view.findViewById(R.id.layout_icon);
    ImageView imgBg = (ImageView) view.findViewById(R.id.bg_icon);
    ImageView imgdefault = (ImageView) view.findViewById(R.id.default_icon);

    if (isClickable) {
        layoutIcon.setBackground(ContextCompat.getDrawable(getActivity(), R.drawable.green_round_bg));
    }

    imgBg.setBackground(ContextCompat.getDrawable(getActivity(), R.drawable.map_bg));
    if(isFirst){
        imgdefault.setBackground(ContextCompat.getDrawable(getActivity(), R.drawable.marker_default));
    }
    final ImageView imgMap = (ImageView) view.findViewById(R.id.img_map_icon);

    if (!isFirst) {
        imgMap.setImageBitmap(resultImage);
    }

    RelativeLayout.LayoutParams layoutParams = (RelativeLayout.LayoutParams) imgMap.getLayoutParams();
    layoutParams.addRule(RelativeLayout.CENTER_IN_PARENT, RelativeLayout.TRUE);
    layoutParams.height = BDevice.getPixelFromDp(getActivity(), 30);
    layoutParams.width = BDevice.getPixelFromDp(getActivity(), 30);
    layoutParams.setMargins(BDevice.getPixelFromDp(getActivity(), 10), BDevice.getPixelFromDp(getActivity(), 10), BDevice.getPixelFromDp(getActivity(), 10), BDevice.getPixelFromDp(getActivity(), 20));
    imgMap.setLayoutParams(layoutParams);

    return layoutIcon;
}

layout_map_custom_icon.xml:

    <?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:id="@+id/layout_icon"

  >
  <ImageView
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:layout_centerInParent="true"
      android:id="@+id/bg_icon"
/>
  <ImageView
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:layout_centerInParent="true"
      android:id="@+id/default_icon"
      />
  <ImageView
     android:layout_width="wrap_content"
     android:layout_height="wrap_content"
     android:layout_centerInParent="true"
     android:id="@+id/img_map_icon" />
</RelativeLayout>

但是，如果我使用上述方法，标记渲染会有些慢，并且图像不会保留在缓存中。因此，每当我每次下载图像并设置为标记时退出应用程序。我们可以使用 Picasso 或 Fresco 或 Glide 等任何图像加载库来执行上述过程吗？因此该图像将保留在缓存中。

请指教。谢谢。

Answer 1

试试Picaso。

这是一个库，加载图像和维护缓存非常容易。

Picasso.with(context).load("http://i.imgur.com/DvpvklR.png").into(imageView);

关于：

But if i use the above method means, marker rendering is somewhat slow

这个原因可能与图像大小有关。尝试压缩图像以减少一些字节。这将使您的加载程序更快。

Online compressor for iamgens

如何从网络加载图像作为 android 中的标记图标？

How to load image from Network as marker icon in android?

android

google-maps-markers