从 Android 中的 Google Places API 检索图像

Question

在一个片段中，我实现了一个 Google PlaceAutoCompleteFragment。选择地点后，我想将该地点的图像上传到 Parse 服务器，所以我一直关注this guide。

在 OnCreateView() 中，我已经初始化了 GeoDataClient mGeoDataClient 使用

mGeoDataClient = Places.getGeoDataClient(getActivity());

我将正确的 placeId 传递给以下方法，调试器说 photoMetadataResponse 是 zzu@6303（我认为这没问题？）。似乎 onComplete 永远不会被执行，并且 bitmapArray 最后的大小为 0，因此 bitmap 返回为 null。

       // Request photos and metadata for the specified place.
private Bitmap getPhotos(String placeId) {
    final ArrayList<Bitmap> bitmapArray = new ArrayList<Bitmap>();
    final Task<PlacePhotoMetadataResponse> photoMetadataResponse = mGeoDataClient.getPlacePhotos(placeId);
    photoMetadataResponse.addOnCompleteListener(new OnCompleteListener<PlacePhotoMetadataResponse>() {
        @Override
        public void onComplete(@NonNull Task<PlacePhotoMetadataResponse> task) {
            // Get the list of photos.
            PlacePhotoMetadataResponse photos = task.getResult();
            // Get the PlacePhotoMetadataBuffer (metadata for all of the photos).
            PlacePhotoMetadataBuffer photoMetadataBuffer = photos.getPhotoMetadata();
            // Get the first photo in the list.
            PlacePhotoMetadata photoMetadata = photoMetadataBuffer.get(0);
            // Get the attribution text.
            CharSequence attribution = photoMetadata.getAttributions();
            // Get a full-size bitmap for the photo.
            Task<PlacePhotoResponse> photoResponse = mGeoDataClient.getPhoto(photoMetadata);
            photoResponse.addOnCompleteListener(new OnCompleteListener<PlacePhotoResponse>() {
                @Override
                public void onComplete(@NonNull Task<PlacePhotoResponse> task) {
                    PlacePhotoResponse photo = task.getResult();
                    Bitmap bitmap = photo.getBitmap();
                    bitmapArray.add(bitmap); // Add a bitmap
                }
            });
        }
    });
    return bitmapArray.get(0);
}

任何建议将不胜感激！

Answer 1

您在 onCompleteListener 完成之前返回 bitmapArray.get(0);。您应该在片段顶部设置一个变量bitmapArray，并在照片完成侦听器完成后将位图添加到 ArrayList。

public class ExampleFragment extends Fragment {

//Google places
protected GeoDataClient mGeoDataClient;

//vars
prvivate ArrayList<Bitmap> bitmapArray = new ArrayList<>();

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    View view = inflater.inflate(R.layout.example_fragment, container, false);

    mGeoDataClient = Places.getGeoDataClient(ExampleFragment.this, null);

    return view;
}

// Request photos and metadata for the specified place.
private void getPhotos(String placeId) {
    final Task<PlacePhotoMetadataResponse> photoMetadataResponse = mGeoDataClient.getPlacePhotos(placeId);
    photoMetadataResponse.addOnCompleteListener(new OnCompleteListener<PlacePhotoMetadataResponse>() {
        @Override
        public void onComplete(@NonNull Task<PlacePhotoMetadataResponse> task) {
            // Get the list of photos.
            PlacePhotoMetadataResponse photos = task.getResult();
            // Get the PlacePhotoMetadataBuffer (metadata for all of the photos).
            PlacePhotoMetadataBuffer photoMetadataBuffer = photos.getPhotoMetadata();
            // Get the first photo in the list.
            PlacePhotoMetadata photoMetadata = photoMetadataBuffer.get(0);
            // Get the attribution text.
            CharSequence attribution = photoMetadata.getAttributions();
            // Get a full-size bitmap for the photo.
            Task<PlacePhotoResponse> photoResponse = mGeoDataClient.getPhoto(photoMetadata);
            photoResponse.addOnCompleteListener(new OnCompleteListener<PlacePhotoResponse>() {
                @Override
                public void onComplete(@NonNull Task<PlacePhotoResponse> task) {
                    PlacePhotoResponse photo = task.getResult();
                    Bitmap bitmap = photo.getBitmap();
                    bitmapArray.add(bitmap); // Add a bitmap to array
                    //handle the new bitmap here

                }
            });
        }
    });
}
}