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 static de.vanita5.twittnuker.util.Utils.encodeQueryParams; import android.content.BroadcastReceiver; import android.content.Context; import android.content.Intent; import android.content.IntentFilter; import android.content.SharedPreferences; import android.os.Bundle; import android.support.v4.app.LoaderManager; import android.support.v4.content.Loader; import de.vanita5.twittnuker.adapter.ParcelableStatusesAdapter; import de.vanita5.twittnuker.adapter.iface.IStatusesAdapter; import de.vanita5.twittnuker.loader.support.DummyParcelableStatusesLoader; import de.vanita5.twittnuker.model.ParcelableStatus; import de.vanita5.twittnuker.util.ArrayUtils; import java.io.IOException; import java.util.ArrayList; import java.util.List; public abstract class ParcelableStatusesListFragment extends BaseStatusesListFragment<List<ParcelableStatus>> { protected SharedPreferences mPreferences; private boolean mStatusesRestored; private boolean mIsFirstCreated; private final BroadcastReceiver mStateReceiver = new BroadcastReceiver() { @Override public void onReceive(final Context context, final Intent intent) { if (getActivity() == null || !isAdded() || isDetached()) return; final String action = intent.getAction(); if (BROADCAST_STATUS_DESTROYED.equals(action)) { final long status_id = intent.getLongExtra(EXTRA_STATUS_ID, -1); final boolean succeed = intent.getBooleanExtra(EXTRA_SUCCEED, false); if (status_id > 0 && succeed) { deleteStatus(status_id); } } else if (BROADCAST_RETWEET_CHANGED.equals(action)) { final long status_id = intent.getLongExtra(EXTRA_STATUS_ID, -1); final boolean retweeted = intent.getBooleanExtra(EXTRA_RETWEETED, false); if (status_id > 0 && !retweeted) { deleteStatus(status_id); } } else if (BROADCAST_MULTI_MUTESTATE_CHANGED.equals(action)) { final Bundle args = getArguments(); final long account_id = args != null ? args.getLong(EXTRA_ACCOUNT_ID, -1) : -1; if (account_id <= 0) return; getStatuses(new long[] { account_id }, null, null); } } }; public final void deleteStatus(final long status_id) { final List<ParcelableStatus> data = getData(); if (status_id <= 0 || data == null) return; final ArrayList<ParcelableStatus> data_to_remove = new ArrayList<ParcelableStatus>(); for (final ParcelableStatus status : data) { if (status.id == status_id || status.retweet_id > 0 && status.retweet_id == status_id) { data_to_remove.add(status); } } data.removeAll(data_to_remove); getListAdapter().setData(data); } @Override public final int getStatuses(final long[] account_ids, final long[] max_ids, final long[] since_ids) { mStatusesRestored = true; 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 = new Bundle(getArguments()); args.putLong(EXTRA_MAX_ID, max_id); args.putLong(EXTRA_SINCE_ID, since_id); getLoaderManager().restartLoader(0, args, this); return -1; } @Override public void onActivityCreated(final Bundle savedInstanceState) { mStatusesRestored = false; if (savedInstanceState != null) { final List<ParcelableStatus> saved = savedInstanceState.getParcelableArrayList(EXTRA_DATA); if (saved != null) { setData(saved); } } super.onActivityCreated(savedInstanceState); mPreferences = getSharedPreferences(); mIsFirstCreated = savedInstanceState == null; } @Override public final Loader<List<ParcelableStatus>> onCreateLoader(final int id, final Bundle args) { setProgressBarIndeterminateVisibility(true); final List<ParcelableStatus> data = getData(); if (isInstanceStateSaved() && data != null && !mStatusesRestored) return new DummyParcelableStatusesLoader(getActivity(), data); final Loader<List<ParcelableStatus>> loader = newLoaderInstance(getActivity(), args); return loader != null ? loader : new DummyParcelableStatusesLoader(getActivity()); } @Override public void onLoadFinished(final Loader<List<ParcelableStatus>> loader, final List<ParcelableStatus> data) { super.onLoadFinished(loader, data); if (mIsFirstCreated && mPreferences.getBoolean(KEY_REFRESH_ON_START, false)) { onRefreshFromStart(); } } @Override public void onRefreshFromStart() { if (isRefreshing()) return; final IStatusesAdapter<List<ParcelableStatus>> adapter = getListAdapter(); final int count = adapter.getCount(); final ParcelableStatus status = count > 0 ? adapter.getStatus(0) : null; if (status != null) { getStatuses(new long[] { status.account_id }, null, new long[] { status.id }); } else { getStatuses(null, null, null); } } @Override public void onSaveInstanceState(final Bundle outState) { final List<ParcelableStatus> data = getData(); if (data != null) { outState.putParcelableArrayList(EXTRA_DATA, new ArrayList<ParcelableStatus>(data)); } super.onSaveInstanceState(outState); } @Override public void onStart() { super.onStart(); final IntentFilter filter = new IntentFilter(BROADCAST_STATUS_DESTROYED); filter.addAction(BROADCAST_RETWEET_CHANGED); registerReceiver(mStateReceiver, filter); } @Override public void onStop() { unregisterReceiver(mStateReceiver); super.onStop(); } @Override protected final long[] getNewestStatusIds() { final IStatusesAdapter<List<ParcelableStatus>> adapter = getListAdapter(); final long last_id = adapter.getCount() > 0 ? adapter.getStatus(0).id : -1; return last_id > 0 ? new long[] { last_id } : null; } @Override protected final long[] getOldestStatusIds() { final IStatusesAdapter<List<ParcelableStatus>> adapter = getListAdapter(); final ParcelableStatus status = adapter.getLastStatus(); final long last_id = status != null ? status.id : -1; return last_id > 0 ? new long[] { last_id } : null; } @Override protected final String getPositionKey() { final Object[] args = getSavedStatusesFileArgs(); if (args == null || args.length <= 0) return null; try { return encodeQueryParams(ArrayUtils.toString(args, '.', false) + "." + getTabPosition()); } catch (final IOException e) { e.printStackTrace(); } return null; } protected abstract Object[] getSavedStatusesFileArgs(); @Override protected void loadMoreStatuses() { if (isRefreshing()) return; final IStatusesAdapter<List<ParcelableStatus>> adapter = getListAdapter(); final ParcelableStatus status = adapter.getLastStatus(); if (status != null) { getStatuses(new long[] { status.account_id }, new long[] { status.id }, null); } } @Override protected ParcelableStatusesAdapter newAdapterInstance(final boolean compact, final boolean plain) { return new ParcelableStatusesAdapter(getActivity(), compact, plain); } protected abstract Loader<List<ParcelableStatus>> newLoaderInstance(Context context, Bundle args); @Override protected void updateRefreshState() { if (getActivity() == null || !getUserVisibleHint() || !isVisible()) return; final LoaderManager lm = getLoaderManager(); final boolean hasRunningLoaders = lm.hasRunningLoaders(); if (!hasRunningLoaders) { setRefreshing(true); } setRefreshing(hasRunningLoaders); } }