PhotoGalleryFragment.java
import android.content.Intent; import android.graphics.Bitmap; import android.graphics.drawable.BitmapDrawable; import android.graphics.drawable.Drawable; import android.net.Uri; import android.os.AsyncTask; import android.os.Bundle; import android.os.Handler; import android.support.v4.app.Fragment; import android.support.v7.widget.GridLayoutManager; import android.support.v7.widget.RecyclerView; import android.support.v7.widget.SearchView; import android.util.Log; import android.view.LayoutInflater; import android.view.Menu; import android.view.MenuInflater; import android.view.MenuItem; import android.view.View; import android.view.ViewGroup; import android.widget.ImageView; import java.util.ArrayList; import java.util.List; public class PhotoGalleryFragment extends VisibleFragment { private static final String TAG = "PhotoGalleryFragment"; private RecyclerView mPhotoRecyclerView; private List<GalleryItem> mItems = new ArrayList<>(); private ThumbnailDownloader<PhotoHolder> mThumbnailDownloader; public static PhotoGalleryFragment newInstance() { return new PhotoGalleryFragment(); } @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setRetainInstance(true); setHasOptionsMenu(true); updateItems(); Handler responseHandler = new Handler(); mThumbnailDownloader = new ThumbnailDownloader<>(responseHandler); mThumbnailDownloader.setThumbnailDownloadListener( new ThumbnailDownloader.ThumbnailDownloadListener<PhotoHolder>() { @Override public void onThumbnailDownloaded(PhotoHolder photoHolder, Bitmap bitmap) { Drawable drawable = new BitmapDrawable(getResources(), bitmap); photoHolder.bindDrawable(drawable); } } ); mThumbnailDownloader.start(); mThumbnailDownloader.getLooper(); Log.i(TAG, "Background thread started"); } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View v = inflater.inflate(R.layout.fragment_photo_gallery, container, false); mPhotoRecyclerView = (RecyclerView) v.findViewById(R.id.photo_recycler_view); mPhotoRecyclerView.setLayoutManager(new GridLayoutManager(getActivity(), 3)); setupAdapter(); return v; } @Override public void onDestroyView() { super.onDestroyView(); mThumbnailDownloader.clearQueue(); } @Override public void onDestroy() { super.onDestroy(); mThumbnailDownloader.quit(); Log.i(TAG, "Background thread destroyed"); } @Override public void onCreateOptionsMenu(Menu menu, MenuInflater menuInflater) { super.onCreateOptionsMenu(menu, menuInflater); menuInflater.inflate(R.menu.fragment_photo_gallery, menu); MenuItem searchItem = menu.findItem(R.id.menu_item_search); final SearchView searchView = (SearchView) searchItem.getActionView(); searchView.setOnQueryTextListener(new SearchView.OnQueryTextListener() { @Override public boolean onQueryTextSubmit(String s) { Log.d(TAG, "QueryTextSubmit: " + s); QueryPreferences.setStoredQuery(getActivity(), s); updateItems(); return true; } @Override public boolean onQueryTextChange(String s) { Log.d(TAG, "QueryTextChange: " + s); return false; } }); searchView.setOnSearchClickListener(new View.OnClickListener() { @Override public void onClick(View v) { String query = QueryPreferences.getStoredQuery(getActivity()); searchView.setQuery(query, false); } }); MenuItem toggleItem = menu.findItem(R.id.menu_item_toggle_polling); if (PollService.isServiceAlarmOn(getActivity())) { toggleItem.setTitle(R.string.stop_polling); } else { toggleItem.setTitle(R.string.start_polling); } } @Override public boolean onOptionsItemSelected(MenuItem item) { switch (item.getItemId()) { case R.id.menu_item_clear: QueryPreferences.setStoredQuery(getActivity(), null); updateItems(); return true; case R.id.menu_item_toggle_polling: boolean shouldStartAlarm = !PollService.isServiceAlarmOn(getActivity()); PollService.setServiceAlarm(getActivity(), shouldStartAlarm); getActivity().invalidateOptionsMenu(); return true; default: return super.onOptionsItemSelected(item); } } private void updateItems() { String query = QueryPreferences.getStoredQuery(getActivity()); new FetchItemsTask(query).execute(); } private void setupAdapter() { if (isAdded()) { mPhotoRecyclerView.setAdapter(new PhotoAdapter(mItems)); } } private class PhotoHolder extends RecyclerView.ViewHolder implements View.OnClickListener{ private ImageView mItemImageView; private GalleryItem mGalleryItem; public PhotoHolder(View itemView) { super(itemView); mItemImageView = (ImageView) itemView.findViewById(R.id.item_image_view); itemView.setOnClickListener(this); } public void bindDrawable(Drawable drawable) { mItemImageView.setImageDrawable(drawable); } public void bindGalleryItem(GalleryItem galleryItem) { mGalleryItem = galleryItem; } @Override public void onClick(View v) { Intent i = PhotoPageActivity .newIntent(getActivity(), mGalleryItem.getPhotoPageUri()); startActivity(i); } } private class PhotoAdapter extends RecyclerView.Adapter<PhotoHolder> { private List<GalleryItem> mGalleryItems; public PhotoAdapter(List<GalleryItem> galleryItems) { mGalleryItems = galleryItems; } @Override public PhotoHolder onCreateViewHolder(ViewGroup viewGroup, int viewType) { LayoutInflater inflater = LayoutInflater.from(getActivity()); View view = inflater.inflate(R.layout.list_item_gallery, viewGroup, false); return new PhotoHolder(view); } @Override public void onBindViewHolder(PhotoHolder photoHolder, int position) { GalleryItem galleryItem = mGalleryItems.get(position); photoHolder.bindGalleryItem(galleryItem); Drawable placeholder = getResources().getDrawable(R.drawable.bill_up_close); photoHolder.bindDrawable(placeholder); mThumbnailDownloader.queueThumbnail(photoHolder, galleryItem.getUrl()); } @Override public int getItemCount() { return mGalleryItems.size(); } } private class FetchItemsTask extends AsyncTask<Void,Void,List<GalleryItem>> { private String mQuery; public FetchItemsTask(String query) { mQuery = query; } @Override protected List<GalleryItem> doInBackground(Void... params) { if (mQuery == null) { return new FlickrFetchr().fetchRecentPhotos(); } else { return new FlickrFetchr().searchPhotos(mQuery); } } @Override protected void onPostExecute(List<GalleryItem> items) { mItems = items; setupAdapter(); } } }