Android Programming The Big Nerd Ranch Guide by Bill Phillips, Chris Stewart, Kristin Marsicano (z-lib.org)

Chapter 33  Locations and Play Services

Find and Display an Image

Now that you have a location fix, it is time to use it. Write an async task to find a GalleryItem near
your location fix, download its associated image, and display it.

Put this code inside a new inner AsyncTask called SearchTask. Start by performing the search,
selecting the first GalleryItem that comes up.

Listing 33.22  Writing SearchTask (LocatrFragment.java)

private void findImage() {
...
LocationServices.FusedLocationApi
.requestLocationUpdates(mClient, request, new LocationListener() {
@Override
public void onLocationChanged(Location location) {
Log.i(TAG, "Got a fix: " + location);
new SearchTask().execute(location);
}
});
}

private boolean hasLocationPermission() {
int result = ContextCompat
.checkSelfPermission(getActivity(), LOCATION_PERMISSIONS[0]);
return result == PackageManager.PERMISSION_GRANTED;
}

private class SearchTask extends AsyncTask<Location,Void,Void> {
private GalleryItem mGalleryItem;

@Override
protected Void doInBackground(Location... params) {
FlickrFetchr fetchr = new FlickrFetchr();
List items = fetchr.searchPhotos(params[0]);

if (items.size() == 0) {
return null;
}

mGalleryItem = items.get(0);

return null;
}
}

Saving out the GalleryItem here accomplishes nothing for now. But it will save you a bit of typing in
the next chapter.

Next, download that GalleryItem’s associated image data and decode it. Then display it on
mImageView inside onPostExecute(Void).