Java tutorial
/* * Twittnuker - Twitter client for Android * * Copyright (C) 2013-2014 vanita5 <mail@vanita5.de> * * This program incorporates a modified version of Twidere. * Copyright (C) 2012-2014 Mariotaku Lee <mariotaku.lee@gmail.com> * * This program 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. * * This program 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 this program. If not, see <http://www.gnu.org/licenses/>. */ package de.vanita5.twittnuker.fragment.support; import android.content.Context; import android.content.Intent; import android.content.SharedPreferences; import android.graphics.Rect; import android.os.Bundle; import android.support.annotation.Nullable; import android.support.v4.app.LoaderManager.LoaderCallbacks; import android.support.v4.content.Loader; import android.support.v4.widget.SwipeRefreshLayout; import android.support.v4.widget.SwipeRefreshLayout.OnRefreshListener; import android.support.v7.widget.LinearLayoutManager; import android.support.v7.widget.PopupMenu; import android.support.v7.widget.RecyclerView; import android.support.v7.widget.RecyclerView.OnScrollListener; import android.view.Gravity; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import com.squareup.otto.Bus; import com.squareup.otto.Subscribe; import de.vanita5.twittnuker.R; import de.vanita5.twittnuker.adapter.AbsStatusesAdapter; import de.vanita5.twittnuker.adapter.AbsStatusesAdapter.StatusAdapterListener; import de.vanita5.twittnuker.adapter.decorator.DividerItemDecoration; import de.vanita5.twittnuker.app.TwittnukerApplication; import de.vanita5.twittnuker.fragment.iface.RefreshScrollTopInterface; import de.vanita5.twittnuker.loader.iface.IExtendedLoader; import de.vanita5.twittnuker.model.ParcelableStatus; import de.vanita5.twittnuker.util.AsyncTwitterWrapper; import de.vanita5.twittnuker.util.SimpleDrawerCallback; import de.vanita5.twittnuker.util.ThemeUtils; import de.vanita5.twittnuker.util.Utils; import de.vanita5.twittnuker.util.message.StatusListChangedEvent; import de.vanita5.twittnuker.view.HeaderDrawerLayout.DrawerCallback; import de.vanita5.twittnuker.view.holder.GapViewHolder; import de.vanita5.twittnuker.view.holder.StatusViewHolder; import static de.vanita5.twittnuker.util.Utils.setMenuForStatus; public abstract class AbsStatusesFragment<Data> extends BaseSupportFragment implements LoaderCallbacks<Data>, OnRefreshListener, DrawerCallback, RefreshScrollTopInterface, StatusAdapterListener { private final Object mStatusesBusCallback; private AbsStatusesAdapter<Data> mAdapter; private LinearLayoutManager mLayoutManager; private View mContentView; private SharedPreferences mPreferences; private View mProgressContainer; private SwipeRefreshLayout mSwipeRefreshLayout; private RecyclerView mRecyclerView; private SimpleDrawerCallback mDrawerCallback; private OnScrollListener mOnScrollListener = new OnScrollListener() { private int mScrollState; @Override public void onScrollStateChanged(RecyclerView recyclerView, int newState) { super.onScrollStateChanged(recyclerView, newState); mScrollState = newState; } @Override public void onScrolled(RecyclerView recyclerView, int dx, int dy) { final LinearLayoutManager layoutManager = (LinearLayoutManager) recyclerView.getLayoutManager(); if (isRefreshing()) return; if (mAdapter.hasLoadMoreIndicator() && mScrollState != RecyclerView.SCROLL_STATE_IDLE && layoutManager.findLastVisibleItemPosition() == mAdapter.getItemCount() - 1) { onLoadMoreStatuses(); } } }; private PopupMenu mPopupMenu; protected AbsStatusesFragment() { mStatusesBusCallback = createMessageBusCallback(); } @Override public boolean canScroll(float dy) { return mDrawerCallback.canScroll(dy); } @Override public void cancelTouch() { mDrawerCallback.cancelTouch(); } @Override public void fling(float velocity) { mDrawerCallback.fling(velocity); } @Override public boolean isScrollContent(float x, float y) { return mDrawerCallback.isScrollContent(x, y); } @Override public void scrollBy(float dy) { mDrawerCallback.scrollBy(dy); } @Override public boolean shouldLayoutHeaderBottom() { return mDrawerCallback.shouldLayoutHeaderBottom(); } @Override public void topChanged(int offset) { mDrawerCallback.topChanged(offset); } public AbsStatusesAdapter<Data> getAdapter() { return mAdapter; } public SharedPreferences getSharedPreferences() { if (mPreferences != null) return mPreferences; return mPreferences = getSharedPreferences(SHARED_PREFERENCES_NAME, Context.MODE_PRIVATE); } public abstract int getStatuses(long[] accountIds, long[] maxIds, long[] sinceIds); public boolean isRefreshing() { return mSwipeRefreshLayout.isRefreshing(); } public void setRefreshing(boolean refreshing) { mSwipeRefreshLayout.setRefreshing(refreshing); } @Override public final Loader<Data> onCreateLoader(int id, Bundle args) { final boolean fromUser = args.getBoolean(EXTRA_FROM_USER); args.remove(EXTRA_FROM_USER); return onCreateStatusesLoader(getActivity(), args, fromUser); } @Override public final void onLoadFinished(Loader<Data> loader, Data data) { setRefreshing(false); final SharedPreferences preferences = getSharedPreferences(); final boolean readFromBottom = preferences.getBoolean(KEY_READ_FROM_BOTTOM, false); final long lastReadId; final int lastVisiblePos, lastVisibleTop; if (readFromBottom) { lastVisiblePos = mLayoutManager.findLastVisibleItemPosition(); } else { lastVisiblePos = mLayoutManager.findFirstVisibleItemPosition(); } if (lastVisiblePos != -1) { lastReadId = mAdapter.getItemId(lastVisiblePos); if (readFromBottom) { lastVisibleTop = mLayoutManager.getChildAt(mLayoutManager.getChildCount() - 1).getTop(); } else { lastVisibleTop = mLayoutManager.getChildAt(0).getTop(); } } else { lastReadId = -1; lastVisibleTop = 0; } mAdapter.setData(data); if (!(data instanceof IExtendedLoader) || ((IExtendedLoader) data).isFromUser()) { mAdapter.setLoadMoreIndicatorEnabled(hasMoreData(data)); int pos = -1; for (int i = 0; i < mAdapter.getItemCount(); i++) { if (lastReadId == mAdapter.getItemId(i)) { pos = i; break; } } if (pos != -1 && mAdapter.isStatus(pos) && (readFromBottom || lastVisiblePos != 0)) { mLayoutManager.scrollToPositionWithOffset(pos, lastVisibleTop - mLayoutManager.getPaddingTop()); } } if (data instanceof IExtendedLoader) { ((IExtendedLoader) data).setFromUser(false); } setListShown(true); } @Override public void onLoaderReset(Loader<Data> loader) { } public abstract Loader<Data> onCreateStatusesLoader(final Context context, final Bundle args, final boolean fromUser); @Override public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) { return inflater.inflate(R.layout.fragment_recycler_view, container, false); } @Override public void onActivityCreated(@Nullable Bundle savedInstanceState) { super.onActivityCreated(savedInstanceState); final View view = getView(); if (view == null) throw new AssertionError(); final Context context = view.getContext(); final boolean compact = Utils.isCompactCards(context); mDrawerCallback = new SimpleDrawerCallback(mRecyclerView); mSwipeRefreshLayout.setOnRefreshListener(this); mSwipeRefreshLayout.setColorSchemeColors(ThemeUtils.getUserAccentColor(context)); mAdapter = onCreateAdapter(context, compact); mLayoutManager = new LinearLayoutManager(context); mLayoutManager.setOrientation(LinearLayoutManager.VERTICAL); mRecyclerView.setLayoutManager(mLayoutManager); if (compact) { mRecyclerView.addItemDecoration(new DividerItemDecoration(context, mLayoutManager.getOrientation())); } mRecyclerView.setAdapter(mAdapter); mRecyclerView.setOnScrollListener(mOnScrollListener); mAdapter.setListener(this); final Bundle loaderArgs = new Bundle(getArguments()); loaderArgs.putBoolean(EXTRA_FROM_USER, true); getLoaderManager().initLoader(0, loaderArgs, this); setListShown(false); } @Override public void onStart() { super.onStart(); final Bus bus = TwittnukerApplication.getInstance(getActivity()).getMessageBus(); bus.register(mStatusesBusCallback); } @Override public void onStop() { final Bus bus = TwittnukerApplication.getInstance(getActivity()).getMessageBus(); bus.unregister(mStatusesBusCallback); super.onStop(); } @Override public void onDestroyView() { if (mPopupMenu != null) { mPopupMenu.dismiss(); } super.onDestroyView(); } @Override public void onGapClick(GapViewHolder holder, int position) { final ParcelableStatus status = mAdapter.getStatus(position); final long sinceId = position + 1 < mAdapter.getStatusCount() ? mAdapter.getStatus(position + 1).id : -1; final long[] accountIds = { status.account_id }; final long[] maxIds = { status.id }; final long[] sinceIds = { sinceId }; getStatuses(accountIds, maxIds, sinceIds); } @Override public void onStatusActionClick(StatusViewHolder holder, int id, int position) { final ParcelableStatus status = mAdapter.getStatus(position); if (status == null) return; switch (id) { case R.id.reply_count: { final Context context = getActivity(); final Intent intent = new Intent(INTENT_ACTION_REPLY); intent.setPackage(context.getPackageName()); intent.putExtra(EXTRA_STATUS, status); context.startActivity(intent); break; } case R.id.retweet_count: { RetweetQuoteDialogFragment.show(getFragmentManager(), status); break; } case R.id.favorite_count: { final AsyncTwitterWrapper twitter = getTwitterWrapper(); if (twitter == null) return; if (status.is_favorite) { twitter.destroyFavoriteAsync(status.account_id, status.id); } else { twitter.createFavoriteAsync(status.account_id, status.id); } break; } } } @Override public void onStatusClick(StatusViewHolder holder, int position) { Utils.openStatus(getActivity(), mAdapter.getStatus(position), null); } @Override public void onStatusMenuClick(StatusViewHolder holder, View menuView, int position) { if (mPopupMenu != null) { mPopupMenu.dismiss(); } final PopupMenu popupMenu = new PopupMenu(mAdapter.getContext(), menuView, Gravity.NO_GRAVITY, R.attr.actionOverflowMenuStyle, 0); popupMenu.inflate(R.menu.action_status); setMenuForStatus(mAdapter.getContext(), popupMenu.getMenu(), mAdapter.getStatus(position)); popupMenu.show(); mPopupMenu = popupMenu; } @Override public void onRefresh() { triggerRefresh(); } @Override public void onViewCreated(View view, @Nullable Bundle savedInstanceState) { mContentView = view.findViewById(R.id.fragment_content); mProgressContainer = view.findViewById(R.id.progress_container); mSwipeRefreshLayout = (SwipeRefreshLayout) view.findViewById(R.id.swipe_layout); mRecyclerView = (RecyclerView) view.findViewById(R.id.recycler_view); super.onViewCreated(view, savedInstanceState); } @Override protected void fitSystemWindows(Rect insets) { super.fitSystemWindows(insets); mContentView.setPadding(insets.left, insets.top, insets.right, insets.bottom); } @Override public boolean scrollToStart() { final AsyncTwitterWrapper twitter = getTwitterWrapper(); final int tabPosition = getTabPosition(); if (twitter != null && tabPosition != -1) { twitter.clearUnreadCountAsync(tabPosition); } mRecyclerView.smoothScrollToPosition(0); return true; } protected Object createMessageBusCallback() { return new StatusesBusCallback(); } protected abstract long[] getAccountIds(); protected Data getAdapterData() { return mAdapter.getData(); } protected void setAdapterData(Data data) { mAdapter.setData(data); } protected abstract boolean hasMoreData(Data data); protected abstract AbsStatusesAdapter<Data> onCreateAdapter(Context context, boolean compact); protected abstract void onLoadMoreStatuses(); private void setListShown(boolean shown) { mProgressContainer.setVisibility(shown ? View.GONE : View.VISIBLE); mSwipeRefreshLayout.setVisibility(shown ? View.VISIBLE : View.GONE); } protected final class StatusesBusCallback { protected StatusesBusCallback() { } @Subscribe public void notifyStatusListChanged(StatusListChangedEvent event) { mAdapter.notifyDataSetChanged(); } } }