Java tutorial
/* * Tweetings - Twitter client for Android * * Copyright (C) 2012-2013 RBD Solutions Limited <apps@tweetings.net> * Copyright (C) 2012 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 com.dwdesign.tweetings.fragment; import static com.dwdesign.tweetings.util.HtmlEscapeHelper.unescape; import java.io.File; import java.io.FileOutputStream; import java.io.IOException; import java.io.ObjectOutputStream; import java.util.ArrayList; import java.util.List; import com.dwdesign.tweetings.adapter.ParcelableStatusesAdapter; import com.dwdesign.tweetings.loader.ParcelableStatusesLoader; import com.dwdesign.tweetings.model.ParcelableStatus; import com.dwdesign.tweetings.provider.TweetStore.Statuses; import com.dwdesign.tweetings.util.NoDuplicatesArrayList; import com.dwdesign.tweetings.util.SynchronizedStateSavedList; import android.content.BroadcastReceiver; import android.content.ContentResolver; import android.content.ContentValues; import android.content.Context; import android.content.Intent; import android.content.IntentFilter; import android.content.SharedPreferences; import android.os.Bundle; import android.os.Parcelable; import android.support.v4.content.Loader; import android.text.Html; import android.text.Spanned; import android.widget.ListView; public abstract class ParcelableStatusesListFragment extends BaseStatusesListFragment<SynchronizedStateSavedList<ParcelableStatus, Long>> { private SharedPreferences mPreferences; private ParcelableStatusesAdapter mAdapter; private ListView mListView; private final BroadcastReceiver mStateReceiver = new BroadcastReceiver() { @Override public void onReceive(final Context context, final Intent intent) { final String action = intent.getAction(); if (BROADCAST_STATUS_DESTROYED.equals(action)) { final long status_id = intent.getLongExtra(INTENT_KEY_STATUS_ID, -1); final boolean succeed = intent.getBooleanExtra(INTENT_KEY_SUCCEED, false); if (status_id > 0 && succeed) { deleteStatus(status_id); } } else if (BROADCAST_RETWEET_CHANGED.equals(action)) { final long status_id = intent.getLongExtra(INTENT_KEY_STATUS_ID, -1); final boolean retweeted = intent.getBooleanExtra(INTENT_KEY_RETWEETED, false); if (status_id > 0 && !retweeted) { deleteStatus(status_id); } } else if (BROADCAST_TWITLONGER_EXPANDED.equals(action)) { final String expanded_status_text = intent.getStringExtra(INTENT_KEY_TWITLONGER_EXPANDED_TEXT); final String original_url = intent.getStringExtra(INTENT_KEY_TWITLONGER_ORIGINAL_URL); final String user = intent.getStringExtra(INTENT_KEY_TWITLONGER_USER); NoDuplicatesArrayList<ParcelableStatus> statuses = mAdapter.getStatuses(); for (ParcelableStatus status : statuses) { if (status.text_html.contains(original_url) && status.screen_name.equals(user)) { status.text_html = expanded_status_text; status.text_plain = unescape(expanded_status_text); Spanned expanded_text = Html.fromHtml(expanded_status_text); status.text = expanded_text; getLoaderManager().restartLoader(0, null, ParcelableStatusesListFragment.this); break; } } } } }; public final void deleteStatus(final long status_id) { if (status_id <= 0 || mData == null) return; final ArrayList<ParcelableStatus> data_to_remove = new ArrayList<ParcelableStatus>(); for (final ParcelableStatus status : mData) { if (status.status_id == status_id || status.retweet_id == status_id) { data_to_remove.add(status); } } mData.removeAll(data_to_remove); mAdapter.setData(mData); } @Override public final long[] getLastStatusIds() { final int last_idx = mAdapter.getCount() - 1; final long last_id = last_idx >= 0 ? mAdapter.getItem(last_idx).status_id : -1; return last_id > 0 ? new long[] { last_id } : null; } @Override public final long[] getNewestStatusIds() { final long last_id = mAdapter.getCount() > 0 ? mAdapter.getItem(0).status_id : -1; return last_id > 0 ? new long[] { last_id } : null; } @Override public final ParcelableStatusesAdapter getListAdapter() { return mAdapter; } @Override public final int getStatuses(final long[] account_ids, final long[] max_ids, final long[] since_ids) { final long max_id = max_ids != null && max_ids.length == 1 ? max_ids[0] : -1; final long since_id = since_ids != null && since_ids.length == 1 ? since_ids[0] : -1; final Bundle args = (Bundle) getArguments().clone(); args.putLong(INTENT_KEY_MAX_ID, max_id); args.putLong(INTENT_KEY_SINCE_ID, since_id); getLoaderManager().restartLoader(0, args, this); return -1; } public boolean isLoaderUsed() { return true; } public abstract Loader<SynchronizedStateSavedList<ParcelableStatus, Long>> newLoaderInstance(Bundle args); @Override public void onActivityCreated(final Bundle savedInstanceState) { if (savedInstanceState != null) { final List<ParcelableStatus> saved = savedInstanceState.getParcelableArrayList(INTENT_KEY_DATA); if (saved != null) { mData = new SynchronizedStateSavedList<ParcelableStatus, Long>(saved); } } mAdapter = new ParcelableStatusesAdapter(getActivity()); mAdapter.setData(mData); super.onActivityCreated(savedInstanceState); mListView = getListView(); mPreferences = getSharedPreferences(); } @Override public final Loader<SynchronizedStateSavedList<ParcelableStatus, Long>> onCreateLoader(final int id, final Bundle args) { if (isLoaderUsed()) { setProgressBarIndeterminateVisibility(true); } return newLoaderInstance(args); } public void onDataLoaded(final Loader<SynchronizedStateSavedList<ParcelableStatus, Long>> loader, final ParcelableStatusesAdapter adapter) { if (loader instanceof ParcelableStatusesLoader) { final Long last_viewed_id = ((ParcelableStatusesLoader) loader).getLastViewedId(); if (last_viewed_id != null && mPreferences.getBoolean(PREFERENCE_KEY_REMEMBER_POSITION, true)) { final int position = adapter.findItemPositionByStatusId(last_viewed_id); if (position > -1 && position < mListView.getCount()) { mListView.setSelection(position); } } } } @Override public void onDestroyView() { super.onDestroyView(); } @Override public final void onLoaderReset(final Loader<SynchronizedStateSavedList<ParcelableStatus, Long>> loader) { super.onLoaderReset(loader); if (!isLoaderUsed()) return; onRefreshComplete(); setProgressBarIndeterminateVisibility(false); } @Override public final void onLoadFinished(final Loader<SynchronizedStateSavedList<ParcelableStatus, Long>> loader, final SynchronizedStateSavedList<ParcelableStatus, Long> data) { super.onLoadFinished(loader, data); if (!isLoaderUsed()) return; mAdapter.setData(data); onDataLoaded(loader, mAdapter); onRefreshComplete(); setProgressBarIndeterminateVisibility(false); } @Override public final void onPostStart() { if (isActivityFirstCreated()) { getLoaderManager().restartLoader(0, getArguments(), this); } } @Override public void onPullDownToRefresh() { final int count = mAdapter.getCount(); final ParcelableStatus status = count > 0 ? mAdapter.getItem(0) : null; if (status != null) { getStatuses(new long[] { status.account_id }, null, new long[] { status.status_id }); } } @Override public void onPullUpToRefresh() { final int count = mAdapter.getCount(); final ParcelableStatus status = count > 0 ? mAdapter.getItem(count - 1) : null; if (status != null) { getStatuses(new long[] { status.account_id }, new long[] { status.status_id }, null); } } @Override public void onSaveInstanceState(final Bundle outState) { if (mData != null) { outState.putParcelableArrayList(INTENT_KEY_DATA, new ArrayList<ParcelableStatus>(mData)); } super.onSaveInstanceState(outState); } @Override public void onStart() { super.onStart(); final IntentFilter filter = new IntentFilter(BROADCAST_STATUS_DESTROYED); filter.addAction(BROADCAST_RETWEET_CHANGED); filter.addAction(BROADCAST_TWITLONGER_EXPANDED); registerReceiver(mStateReceiver, filter); } @Override public void onStop() { unregisterReceiver(mStateReceiver); super.onStop(); } }