Java tutorial
/* * Firetweet - Twitter client for Android * * 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 org.getlantern.firetweet.fragment.support; import android.app.Activity; import android.content.ContentResolver; import android.content.Context; import android.content.SharedPreferences; import android.content.res.Resources; import android.database.Cursor; import android.graphics.Rect; import android.net.Uri; import android.os.AsyncTask; import android.os.Bundle; import android.support.annotation.Nullable; import android.support.v4.app.FragmentActivity; import android.support.v4.app.LoaderManager.LoaderCallbacks; import android.support.v4.content.CursorLoader; import android.support.v4.content.Loader; import android.support.v4.util.LongSparseArray; import android.support.v4.widget.SwipeRefreshLayout; import android.support.v4.widget.SwipeRefreshLayout.OnRefreshListener; import android.support.v7.widget.FixedLinearLayoutManager; import android.support.v7.widget.LinearLayoutManager; import android.support.v7.widget.RecyclerView; import android.view.LayoutInflater; import android.view.MenuItem; import android.view.View; import android.view.ViewConfiguration; import android.view.ViewGroup; import com.squareup.otto.Bus; import com.squareup.otto.Subscribe; import org.getlantern.querybuilder.Columns.Column; import org.getlantern.querybuilder.Expression; import org.getlantern.querybuilder.RawItemArray; import org.getlantern.firetweet.R; import org.getlantern.firetweet.activity.iface.IControlBarActivity; import org.getlantern.firetweet.activity.iface.IControlBarActivity.ControlBarOffsetListener; import org.getlantern.firetweet.activity.support.BaseActionBarActivity; import org.getlantern.firetweet.adapter.MessageEntriesAdapter; import org.getlantern.firetweet.adapter.MessageEntriesAdapter.DirectMessageEntry; import org.getlantern.firetweet.adapter.MessageEntriesAdapter.MessageEntriesAdapterListener; import org.getlantern.firetweet.adapter.decorator.DividerItemDecoration; import org.getlantern.firetweet.app.FiretweetApplication; import org.getlantern.firetweet.fragment.iface.RefreshScrollTopInterface; import org.getlantern.firetweet.provider.FiretweetDataStore.Accounts; import org.getlantern.firetweet.provider.FiretweetDataStore.DirectMessages; import org.getlantern.firetweet.provider.FiretweetDataStore.DirectMessages.Inbox; import org.getlantern.firetweet.provider.FiretweetDataStore.Statuses; import org.getlantern.firetweet.util.AsyncTaskUtils; import org.getlantern.firetweet.util.AsyncTwitterWrapper; import org.getlantern.firetweet.util.ContentListScrollListener; import org.getlantern.firetweet.util.ContentListScrollListener.ContentListSupport; import org.getlantern.firetweet.util.MultiSelectManager; import org.getlantern.firetweet.util.ThemeUtils; import org.getlantern.firetweet.util.Utils; import org.getlantern.firetweet.util.content.SupportFragmentReloadCursorObserver; import org.getlantern.firetweet.util.message.GetMessagesTaskEvent; import org.getlantern.firetweet.util.message.TaskStateChangedEvent; import java.util.Collections; import java.util.HashSet; import java.util.Set; import static org.getlantern.firetweet.util.Utils.getActivatedAccountIds; import static org.getlantern.firetweet.util.Utils.openMessageConversation; public class DirectMessagesFragment extends BaseSupportFragment implements LoaderCallbacks<Cursor>, RefreshScrollTopInterface, OnRefreshListener, MessageEntriesAdapterListener, ControlBarOffsetListener, ContentListSupport { private final SupportFragmentReloadCursorObserver mReloadContentObserver = new SupportFragmentReloadCursorObserver( this, 0, this); private final LongSparseArray<Set<Long>> mUnreadCountsToRemove = new LongSparseArray<>(); private final Set<Integer> mReadPositions = Collections.synchronizedSet(new HashSet<Integer>()); private MultiSelectManager mMultiSelectManager; private SharedPreferences mPreferences; private RecyclerView mRecyclerView; private MessageEntriesAdapter mAdapter; private int mFirstVisibleItem; private RemoveUnreadCountsTask mRemoveUnreadCountsTask; private SwipeRefreshLayout mSwipeRefreshLayout; private View mProgressContainer; private LinearLayoutManager mLayoutManager; public final LongSparseArray<Set<Long>> getUnreadCountsToRemove() { return mUnreadCountsToRemove; } @Override public void onAttach(Activity activity) { super.onAttach(activity); if (activity instanceof IControlBarActivity) { ((IControlBarActivity) activity).registerControlBarOffsetListener(this); } } private Rect mSystemWindowsInsets = new Rect(); private int mControlBarOffsetPixels; @Override protected void fitSystemWindows(Rect insets) { super.fitSystemWindows(insets); mRecyclerView.setPadding(insets.left, insets.top, insets.right, insets.bottom); mSystemWindowsInsets.set(insets); updateRefreshProgressOffset(); } @Override public void onControlBarOffsetChanged(IControlBarActivity activity, float offset) { mControlBarOffsetPixels = Math.round(activity.getControlBarHeight() * (1 - offset)); updateRefreshProgressOffset(); } private void updateRefreshProgressOffset() { if (mSystemWindowsInsets.top == 0 || mSwipeRefreshLayout == null || isRefreshing()) return; final float density = getResources().getDisplayMetrics().density; final int progressCircleDiameter = mSwipeRefreshLayout.getProgressCircleDiameter(); final int swipeStart = (mSystemWindowsInsets.top - mControlBarOffsetPixels) - progressCircleDiameter; // 64: SwipeRefreshLayout.DEFAULT_CIRCLE_TARGET final int swipeDistance = Math.round(64 * density); mSwipeRefreshLayout.setProgressViewOffset(true, swipeStart, swipeStart + swipeDistance); } @Override public void onDetach() { final FragmentActivity activity = getActivity(); if (activity instanceof IControlBarActivity) { ((IControlBarActivity) activity).unregisterControlBarOffsetListener(this); } super.onDetach(); } @Override public void onEntryClick(int position, DirectMessageEntry entry) { Utils.openMessageConversation(getActivity(), entry.account_id, entry.conversation_id); } @Override public void onRefresh() { AsyncTaskUtils.executeTask(new AsyncTask<Object, Object, long[][]>() { @Override protected long[][] doInBackground(final Object... params) { final long[][] result = new long[2][]; result[0] = Utils.getActivatedAccountIds(getActivity()); result[1] = Utils.getNewestMessageIdsFromDatabase(getActivity(), DirectMessages.Inbox.CONTENT_URI); return result; } @Override protected void onPostExecute(final long[][] result) { final AsyncTwitterWrapper twitter = getTwitterWrapper(); if (twitter == null) return; twitter.getReceivedDirectMessagesAsync(result[0], null, result[1]); twitter.getSentDirectMessagesAsync(result[0], null, null); } }); } private void setListShown(boolean shown) { mProgressContainer.setVisibility(shown ? View.GONE : View.VISIBLE); mSwipeRefreshLayout.setVisibility(shown ? View.VISIBLE : View.GONE); } @Override public void onBaseViewCreated(View view, @Nullable Bundle savedInstanceState) { super.onBaseViewCreated(view, savedInstanceState); mProgressContainer = view.findViewById(R.id.progress_container); mSwipeRefreshLayout = (SwipeRefreshLayout) view.findViewById(R.id.swipe_layout); mRecyclerView = (RecyclerView) view.findViewById(R.id.recycler_view); } @Override public Loader<Cursor> onCreateLoader(final int id, final Bundle args) { final Uri uri = DirectMessages.ConversationEntries.CONTENT_URI; final long account_id = getAccountId(); final long[] account_ids = account_id > 0 ? new long[] { account_id } : getActivatedAccountIds(getActivity()); final boolean no_account_selected = account_ids.length == 0; // setEmptyText(no_account_selected ? getString(R.string.no_account_selected) : null); // if (!no_account_selected) { // getListView().setEmptyView(null); // } final Expression account_where = Expression.in(new Column(Statuses.ACCOUNT_ID), new RawItemArray(account_ids)); return new CursorLoader(getActivity(), uri, null, account_where.getSQL(), null, null); } @Override public void onLoadFinished(final Loader<Cursor> loader, final Cursor cursor) { if (getActivity() == null) return; mFirstVisibleItem = -1; mAdapter.setCursor(cursor); mAdapter.setLoadMoreIndicatorVisible(false); mAdapter.setLoadMoreSupported(cursor != null && cursor.getCount() > 0); mSwipeRefreshLayout.setEnabled(true); // mAdapter.setShowAccountColor(getActivatedAccountIds(getActivity()).length > 1); setListShown(true); } @Override public void onLoaderReset(final Loader<Cursor> loader) { mAdapter.setCursor(null); } @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(final Bundle savedInstanceState) { super.onActivityCreated(savedInstanceState); final View view = getView(); if (view == null) throw new AssertionError(); mPreferences = getSharedPreferences(SHARED_PREFERENCES_NAME, Context.MODE_PRIVATE); final Context viewContext = view.getContext(); mMultiSelectManager = getMultiSelectManager(); mAdapter = new MessageEntriesAdapter(viewContext); mAdapter.setListener(this); mLayoutManager = new FixedLinearLayoutManager(viewContext); mLayoutManager.setOrientation(LinearLayoutManager.VERTICAL); mSwipeRefreshLayout.setOnRefreshListener(this); mSwipeRefreshLayout.setColorSchemeColors(ThemeUtils.getUserAccentColor(viewContext)); mRecyclerView.setLayoutManager(mLayoutManager); mRecyclerView.setAdapter(mAdapter); final ContentListScrollListener scrollListener = new ContentListScrollListener(this); scrollListener.setTouchSlop(ViewConfiguration.get(viewContext).getScaledTouchSlop()); mRecyclerView.setOnScrollListener(scrollListener); final DividerItemDecoration itemDecoration = new DividerItemDecoration(viewContext, mLayoutManager.getOrientation()); final Resources res = viewContext.getResources(); final int decorPaddingLeft = res.getDimensionPixelSize(R.dimen.element_spacing_normal) * 3 + res.getDimensionPixelSize(R.dimen.icon_size_status_profile_image); itemDecoration.setPadding(decorPaddingLeft, 0, 0, 0); itemDecoration.setDecorationEndOffset(1); mRecyclerView.addItemDecoration(itemDecoration); getLoaderManager().initLoader(0, null, this); setListShown(false); } @Override public void onStart() { super.onStart(); final ContentResolver resolver = getContentResolver(); resolver.registerContentObserver(Accounts.CONTENT_URI, true, mReloadContentObserver); final Bus bus = FiretweetApplication.getInstance(getActivity()).getMessageBus(); bus.register(this); mAdapter.updateReadState(); updateRefreshState(); } @Subscribe public void onGetMessagesTaskChanged(GetMessagesTaskEvent event) { if (event.uri.equals(Inbox.CONTENT_URI) && !event.running) { setRefreshing(false); mAdapter.setLoadMoreIndicatorVisible(false); mSwipeRefreshLayout.setEnabled(true); } } @Override public void onStop() { final Bus bus = FiretweetApplication.getInstance(getActivity()).getMessageBus(); bus.unregister(this); final ContentResolver resolver = getContentResolver(); resolver.unregisterContentObserver(mReloadContentObserver); super.onStop(); } @Override public boolean onOptionsItemSelected(final MenuItem item) { switch (item.getItemId()) { case MENU_COMPOSE: { openMessageConversation(getActivity(), -1, -1); break; } } return super.onOptionsItemSelected(item); } @Override public boolean scrollToStart() { final AsyncTwitterWrapper twitter = getTwitterWrapper(); final int tabPosition = getTabPosition(); if (twitter != null && tabPosition >= 0) { twitter.clearUnreadCountAsync(tabPosition); } mRecyclerView.smoothScrollToPosition(0); return true; } @Override public boolean triggerRefresh() { return true; } @Override public void setUserVisibleHint(final boolean isVisibleToUser) { super.setUserVisibleHint(isVisibleToUser); } protected long getAccountId() { final Bundle args = getArguments(); return args != null ? args.getLong(EXTRA_ACCOUNT_ID, -1) : -1; } protected void updateRefreshState() { final AsyncTwitterWrapper twitter = getTwitterWrapper(); setRefreshing(twitter != null && (twitter.isReceivedDirectMessagesRefreshing() || twitter.isSentDirectMessagesRefreshing())); } public void setRefreshing(boolean refreshing) { if (mAdapter == null || refreshing == mSwipeRefreshLayout.isRefreshing()) return; mSwipeRefreshLayout.setRefreshing(refreshing && !mAdapter.isLoadMoreIndicatorVisible()); } public boolean isRefreshing() { if (mSwipeRefreshLayout == null || mAdapter == null) return false; return mSwipeRefreshLayout.isRefreshing() || mAdapter.isLoadMoreIndicatorVisible(); } private void addReadPosition(final int firstVisibleItem) { if (mFirstVisibleItem != firstVisibleItem) { mReadPositions.add(firstVisibleItem); } mFirstVisibleItem = firstVisibleItem; } private void addUnreadCountsToRemove(final long accountId, final long id) { if (mUnreadCountsToRemove.indexOfKey(accountId) < 0) { final Set<Long> counts = new HashSet<>(); counts.add(id); mUnreadCountsToRemove.put(accountId, counts); } else { final Set<Long> counts = mUnreadCountsToRemove.get(accountId); counts.add(id); } } // private void loadMoreMessages() { if (isRefreshing()) return; mAdapter.setLoadMoreIndicatorVisible(true); mSwipeRefreshLayout.setEnabled(false); AsyncTaskUtils.executeTask(new AsyncTask<Object, Object, long[][]>() { @Override protected long[][] doInBackground(final Object... params) { final long[][] result = new long[3][]; result[0] = Utils.getActivatedAccountIds(getActivity()); result[1] = Utils.getOldestMessageIdsFromDatabase(getActivity(), DirectMessages.Inbox.CONTENT_URI); result[2] = Utils.getOldestMessageIdsFromDatabase(getActivity(), DirectMessages.Outbox.CONTENT_URI); return result; } @Override protected void onPostExecute(final long[][] result) { final AsyncTwitterWrapper twitter = getTwitterWrapper(); if (twitter == null) return; twitter.getReceivedDirectMessagesAsync(result[0], result[1], null); twitter.getSentDirectMessagesAsync(result[0], result[2], null); } }); } public MessageEntriesAdapter getAdapter() { return mAdapter; } @Override public void setControlVisible(boolean visible) { final FragmentActivity activity = getActivity(); if (activity instanceof BaseActionBarActivity) { ((BaseActionBarActivity) activity).setControlBarVisibleAnimate(visible); } } @Override public void onLoadMoreContents() { loadMoreMessages(); } private void removeUnreadCounts() { if (mRemoveUnreadCountsTask != null && mRemoveUnreadCountsTask.getStatus() == AsyncTask.Status.RUNNING) return; mRemoveUnreadCountsTask = new RemoveUnreadCountsTask(mReadPositions, this); AsyncTaskUtils.executeTask(mRemoveUnreadCountsTask); } static class RemoveUnreadCountsTask extends AsyncTask<Object, Object, Object> { private final Set<Integer> read_positions; private final MessageEntriesAdapter adapter; private final DirectMessagesFragment fragment; RemoveUnreadCountsTask(final Set<Integer> read_positions, final DirectMessagesFragment fragment) { this.read_positions = Collections.synchronizedSet(new HashSet<>(read_positions)); this.fragment = fragment; adapter = fragment.getAdapter(); } @Override protected Object doInBackground(final Object... params) { for (final int pos : read_positions) { final DirectMessageEntry entry = adapter.getEntry(pos); final long id = entry.conversation_id, account_id = entry.account_id; fragment.addUnreadCountsToRemove(account_id, id); } return null; } @Override protected void onPostExecute(final Object result) { final AsyncTwitterWrapper twitter = fragment.getTwitterWrapper(); if (twitter != null) { twitter.removeUnreadCountsAsync(fragment.getTabPosition(), fragment.getUnreadCountsToRemove()); } } } }