Java tutorial
/* * This file is part of Butter. * * Butter is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * Butter is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with Butter. If not, see <http://www.gnu.org/licenses/>. */ package butter.droid.tv.fragments; import android.app.Activity; import android.content.Context; import android.os.Bundle; import android.support.v17.leanback.app.VerticalGridFragment; import android.support.v17.leanback.widget.ArrayObjectAdapter; import android.support.v17.leanback.widget.ImageCardView; import android.support.v17.leanback.widget.OnItemViewClickedListener; import android.support.v17.leanback.widget.OnItemViewSelectedListener; import android.support.v17.leanback.widget.Presenter; import android.support.v17.leanback.widget.Row; import android.support.v17.leanback.widget.RowPresenter; import android.support.v17.leanback.widget.VerticalGridPresenter; import android.support.v4.app.ActivityOptionsCompat; import android.widget.Toast; import java.util.ArrayList; import java.util.List; import butter.droid.base.providers.media.MoviesProvider; import butter.droid.base.providers.media.TVProvider; import hugo.weaving.DebugLog; import butter.droid.base.providers.media.MediaProvider; import butter.droid.base.providers.media.models.Media; import butter.droid.base.providers.media.models.Movie; import butter.droid.base.providers.media.models.Show; import butter.droid.base.utils.StringUtils; import butter.droid.base.utils.ThreadUtils; import butter.droid.tv.R; import butter.droid.tv.activities.TVMediaDetailActivity; import butter.droid.tv.activities.TVMediaGridActivity; import butter.droid.tv.presenters.MediaCardPresenter; import butter.droid.tv.utils.BackgroundUpdater; import timber.log.Timber; /* * VerticalGridFragment shows a grid of videos */ public class TVMediaGridFragment extends VerticalGridFragment implements OnItemViewClickedListener, OnItemViewSelectedListener { private static final int NUM_COLUMNS = 6; private MediaProvider mProvider; private List<MediaCardPresenter.MediaCardItem> mItems = new ArrayList<>(); private ArrayObjectAdapter mAdapter; private Callback mCallback; private BackgroundUpdater mBackgroundUpdater; private int mCurrentPage = 1; public static TVMediaGridFragment newInstance() { return new TVMediaGridFragment(); } @Override public void onAttach(Context context) { super.onAttach(context); mCallback = (Callback) context; } @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setupFragment(); } @Override public void onActivityCreated(Bundle savedInstanceState) { super.onActivityCreated(savedInstanceState); Activity activity = getActivity(); setTitle(StringUtils.capWords((String) activity.getTitle())); if (activity instanceof Callback && mCallback == null) { mCallback = (Callback) getActivity(); } switch (mCallback.getType()) { case MOVIE: mProvider = new MoviesProvider(); break; case SHOW: mProvider = new TVProvider(); break; } loadItems(); } private void setupFragment() { //setup background updater mBackgroundUpdater = new BackgroundUpdater(); mBackgroundUpdater.initialise(getActivity(), R.color.black); VerticalGridPresenter gridPresenter = new VerticalGridPresenter(); gridPresenter.setNumberOfColumns(NUM_COLUMNS); setGridPresenter(gridPresenter); mAdapter = new ArrayObjectAdapter(new MediaCardPresenter(getActivity())); setAdapter(mAdapter); setOnItemViewClickedListener(this); setOnItemViewSelectedListener(this); } private MediaProvider.Filters getFilters() { MediaProvider.Filters filters = new MediaProvider.Filters(mCallback.getFilters()); filters.page = mCurrentPage; return filters; } private void loadItems() { if (mProvider == null) return; mProvider.getList(null, getFilters(), new MediaProvider.Callback() { @DebugLog @Override public void onSuccess(MediaProvider.Filters filters, ArrayList<Media> items, boolean changed) { mCurrentPage = filters.page; List<MediaCardPresenter.MediaCardItem> list = MediaCardPresenter.convertMediaToOverview(items); mItems.addAll(list); int previousSize = mAdapter.size(); mAdapter.addAll(previousSize, list); mAdapter.notifyArrayItemRangeChanged(previousSize, list.size()); } @DebugLog @Override public void onFailure(Exception e) { e.printStackTrace(); ThreadUtils.runOnUiThread(new Runnable() { @Override public void run() { Toast.makeText(getActivity(), "error getting show list", Toast.LENGTH_SHORT).show(); } }); } }); } private void loadMore() { mCurrentPage++; loadItems(); } @Override public void onItemClicked(Presenter.ViewHolder itemViewHolder, Object item, RowPresenter.ViewHolder rowViewHolder, Row row) { if (item instanceof MediaCardPresenter.MediaCardItem) { onMediaItemClicked((ImageCardView) itemViewHolder.view, (MediaCardPresenter.MediaCardItem) item); } } @Override public void onDestroy() { super.onDestroy(); if (null != mBackgroundUpdater) mBackgroundUpdater.destroy(); } private void onMediaItemClicked(ImageCardView view, MediaCardPresenter.MediaCardItem media) { if (media.isLoading()) return; Bundle options = ActivityOptionsCompat.makeSceneTransitionAnimation(getActivity(), view.getMainImageView(), TVMediaDetailActivity.SHARED_ELEMENT_NAME).toBundle(); if (media.getMedia() instanceof Movie) TVMediaDetailActivity.startActivity(getActivity(), options, media.getMedia()); else if (media.getMedia() instanceof Show) TVMediaDetailActivity.startActivity(getActivity(), options, media.getMedia()); } @SuppressWarnings("SuspiciousMethodCalls") @Override public void onItemSelected(Presenter.ViewHolder itemViewHolder, Object item, RowPresenter.ViewHolder rowViewHolder, Row row) { if (item instanceof MediaCardPresenter.MediaCardItem) { MediaCardPresenter.MediaCardItem overviewItem = (MediaCardPresenter.MediaCardItem) item; if (overviewItem.isLoading()) return; mBackgroundUpdater .updateBackgroundAsync(((MediaCardPresenter.MediaCardItem) item).getMedia().headerImage); } //really hacky way of making and 'endless' adapter //trigger items to update int itemPosition = mItems.indexOf(item); //when we are within 3 rows of the end, load more items if (itemPosition > getAdapter().size() - (NUM_COLUMNS * 3)) { Timber.d("Loading more items: page " + mCurrentPage); loadMore(); } } public interface Callback { MediaProvider.Filters getFilters(); TVMediaGridActivity.ProviderType getType(); } }