GoogleMap.InfoWindowAdapter中的毕加索图像加载问题

时间:2015-09-22 19:58:00

标签: android google-maps-markers google-maps-android-api-2 picasso

我正在使用Google Maps Api,并希望在点击标记时在InfoWindow中显示图像。我实现了它,但毕加索有一个问题。单击标记时,将显示infoWindow,imageView将显示占位符图像。如果我再次单击相同的标记,Picasso会成功加载图像。我必须点击两次,这太奇怪了。

为了更好地理解屏幕截图:

首先点击标记:

First Click

当我再次点击时:

Click again

我的代码如下:

InfoWindowAdapter(Picasso在这里加载)

mMap.setInfoWindowAdapter(new GoogleMap.InfoWindowAdapter() {
        @Override
        public View getInfoWindow(Marker marker) {
            return null;
        }

        @Override
        public View getInfoContents(Marker marker) {
            View myContentsView = getLayoutInflater().inflate(R.layout.map_info_content, null);
            ImageView imageView = (ImageView) myContentsView.findViewById(R.id.imgView_map_info_content);
            Picasso.with(MainActivity.this)
                    .load(marker.getSnippet())
                    .placeholder(R.drawable.ic_placeholder)
                    .into(imageView);
            return myContentsView;
        }
    });

设置标记(使用代码段传递图片网址)

for (MediaFeedData item : mItemList) {
        LatLng position = new LatLng(item.getLocation().getLatitude(),
                item.getLocation().getLongitude());
        mMap.addMarker(new MarkerOptions()
                .snippet(item.getImages().getLowResolution().getImageUrl())
                .icon(BitmapDescriptorFactory.fromResource(R.drawable.ic_point))
                .position(position));
    }

InfoWindow layout xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">

<ImageView
    android:id="@+id/imgView_map_info_content"
    android:layout_width="match_parent"
    android:layout_height="match_parent" />

</LinearLayout>

2 个答案:

答案 0 :(得分:11)

我解决了。实际上,post就是答案。但是我想解释一下如何做到这一点并提供更多细节来解决我的问题。

显示InfoWindow时,会捕获布局。这意味着InfoWindows不是动态的,它们只是一张图片,一张快照。这就是为什么我们必须在成功加载图像后刷新InfoWindow。我们可以使用Picasso的Callback来完成它。

我改变了我的代码如下:

我的新InfoWindowAdapter类:

public class MapInfoWindowAdapter implements GoogleMap.InfoWindowAdapter {
    private final Hashtable<String, Boolean> markerSet;
    private Context context;
    private View myContentsView;

    public MapInfoWindowAdapter(Context context, Hashtable<String, Boolean> markerSet) {
        this.context = context;
        this.markerSet = markerSet;
    }

    @Override
    public View getInfoWindow(Marker marker) {
        return null;
    }

    @Override
    public View getInfoContents(Marker marker) {
        LayoutInflater inflater = (LayoutInflater) context
                .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        myContentsView = inflater.inflate(R.layout.map_info_content, null);
        ImageView imageView = (ImageView) myContentsView.findViewById(R.id.imgView_map_info_content);
        boolean isImageLoaded = markerSet.get(marker.getId());
        if (isImageLoaded) {
            Picasso.with(context)
                    .load(marker.getSnippet())
                    .placeholder(R.drawable.ic_placeholder)
                    .into(imageView);
        } else {
            isImageLoaded = true;
            markerSet.put(marker.getId(), isImageLoaded);
            Picasso.with(context)
                    .load(marker.getSnippet())
                    .placeholder(R.drawable.ic_placeholder)
                    .into(imageView, new InfoWindowRefresher(marker));
        }

        return myContentsView;
    }
}

我传递了一个标记集,它包含标记ID和一个布尔值,以确定是否加载了该标记的图像。我正在检查这个以选择应该运行哪个Picasso代码。如果我不这样做,那将是递归。

<强> InfoWindowRefresher:

public class InfoWindowRefresher implements Callback {
    private Marker markerToRefresh;

    public InfoWindowRefresher(Marker markerToRefresh) {
        this.markerToRefresh = markerToRefresh;
    }

    @Override
    public void onSuccess() {
        markerToRefresh.showInfoWindow();
    }

    @Override
    public void onError() {}
}

设置标记(使用代码段传递图片网址):

Hashtable<String, Boolean> markerSet = new Hashtable<>();
for (MediaFeedData item : mItemList) {
    LatLng position = new LatLng(item.getLocation().getLatitude(),
            item.getLocation().getLongitude());
    MarkerOptions markerOptions = new MarkerOptions()
            .snippet(item.getImages().getLowResolution().getImageUrl())
            .icon(BitmapDescriptorFactory.fromResource(R.drawable.ic_point))
            .position(position);
    Marker marker = mMap.addMarker(markerOptions);
    markerSet.put(marker.getId(), false);
}

mMap.setInfoWindowAdapter(new MapInfoWindowAdapter(this, markerSet));

答案 1 :(得分:3)

对我有用的是:

getInfoWindow(标记标记)内部:

Picasso.with(getActivity())
                            .load(URL)
                            .error(R.drawable.my_loader)
                            .placeholder(R.drawable.my_loader)
                            .into(userPhoto, new MarkerCallback(marker,URL,userPhoto));

然后创建一个类:

public class MarkerCallback implements Callback {
Marker marker=null;
String URL;
ImageView userPhoto;


MarkerCallback(Marker marker, String URL, ImageView userPhoto) {
    this.marker=marker;
    this.URL = URL;
    this.userPhoto = userPhoto;
}

@Override
public void onError() {
    //Log.e(getClass().getSimpleName(), "Error loading thumbnail!");
}

@Override
public void onSuccess() {
    if (marker != null && marker.isInfoWindowShown()) {
        marker.hideInfoWindow();

        Picasso.with(getActivity())
                .load(URL)                        
                .into(userPhoto);

        marker.showInfoWindow();
    }
}

}