Java tutorial
/* * Twidere - Twitter client for Android * * 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 org.mariotaku.twidere.fragment; import static org.mariotaku.twidere.util.Utils.buildActivatedStatsWhereClause; import static org.mariotaku.twidere.util.Utils.buildStatusFilterWhereClause; import static org.mariotaku.twidere.util.Utils.getActivatedAccountIds; import static org.mariotaku.twidere.util.Utils.getNewestStatusIdsFromDatabase; import static org.mariotaku.twidere.util.Utils.getOldestStatusIdsFromDatabase; import static org.mariotaku.twidere.util.Utils.getTableNameByUri; import org.mariotaku.twidere.activity.HomeActivity; import org.mariotaku.twidere.adapter.CursorStatusesAdapter; import org.mariotaku.twidere.provider.TweetStore.Statuses; import org.mariotaku.twidere.util.AsyncTask; import android.content.BroadcastReceiver; import android.content.Context; import android.content.Intent; import android.content.IntentFilter; import android.database.Cursor; import android.net.Uri; import android.os.Bundle; import android.support.v4.app.FragmentActivity; import android.support.v4.content.CursorLoader; import android.support.v4.content.Loader; import android.view.MotionEvent; import android.view.View; import android.widget.AbsListView; public abstract class CursorStatusesListFragment extends BaseStatusesListFragment<Cursor> implements View.OnTouchListener { protected CursorStatusesAdapter mAdapter; private final BroadcastReceiver mStatusReceiver = new BroadcastReceiver() { @Override public void onReceive(final Context context, final Intent intent) { final String action = intent.getAction(); if (BROADCAST_ACCOUNT_LIST_DATABASE_UPDATED.equals(action) || BROADCAST_FILTERS_UPDATED.equals(action)) { if (isAdded() && !isDetached()) { getLoaderManager().restartLoader(0, null, CursorStatusesListFragment.this); } } } }; public HomeActivity getHomeActivity() { final FragmentActivity activity = getActivity(); if (activity instanceof HomeActivity) return (HomeActivity) activity; return null; } @Override public CursorStatusesAdapter getListAdapter() { return mAdapter; } @Override public void onActivityCreated(final Bundle savedInstanceState) { mAdapter = new CursorStatusesAdapter(getActivity()); super.onActivityCreated(savedInstanceState); mListView.setOnTouchListener(this); } @Override public Loader<Cursor> onCreateLoader(final int id, final Bundle args) { final String[] cols = new String[] { Statuses._ID, Statuses.ACCOUNT_ID, Statuses.STATUS_ID, Statuses.USER_ID, Statuses.STATUS_TIMESTAMP, Statuses.TEXT, Statuses.NAME, Statuses.SCREEN_NAME, Statuses.PROFILE_IMAGE_URL, Statuses.IN_REPLY_TO_SCREEN_NAME, Statuses.IN_REPLY_TO_STATUS_ID, Statuses.LOCATION, Statuses.IS_RETWEET, Statuses.RETWEET_COUNT, Statuses.RETWEET_ID, Statuses.RETWEETED_BY_NAME, Statuses.RETWEETED_BY_SCREEN_NAME, Statuses.IS_FAVORITE, Statuses.IS_PROTECTED, Statuses.IS_VERIFIED, Statuses.IS_GAP, Statuses.IS_POSSIBLY_SENSITIVE }; final Uri uri = getContentUri(); final String sort_by = getSharedPreferences().getBoolean(PREFERENCE_KEY_SORT_TIMELINE_BY_TIME, false) ? Statuses.SORT_ORDER_TIMESTAMP_DESC : Statuses.SORT_ORDER_STATUS_ID_DESC; final String where = buildActivatedStatsWhereClause(getActivity(), null); final String table = getTableNameByUri(uri); return new CursorLoader(getActivity(), uri, cols, buildStatusFilterWhereClause(table, where), null, sort_by); } @Override public void onLoaderReset(final Loader<Cursor> loader) { super.onLoaderReset(loader); mAdapter.swapCursor(null); } @Override public void onLoadFinished(final Loader<Cursor> loader, final Cursor data) { final int first_visible_position = mListView.getFirstVisiblePosition(); final long last_viewed_id = mAdapter.findItemIdByPosition(first_visible_position); super.onLoadFinished(loader, data); mAdapter.swapCursor(data); final boolean remember_position = mPreferences.getBoolean(PREFERENCE_KEY_REMEMBER_POSITION, true); final int curr_first_visible_position = mListView.getFirstVisiblePosition(); final long curr_viewed_id = mAdapter.findItemIdByPosition(curr_first_visible_position); final long status_id; if (last_viewed_id <= 0) { if (!remember_position) return; status_id = mPreferences.getLong(getSavedTimelinePreferenceKey(), -1); } else if (first_visible_position > 0 && curr_viewed_id > 0 && last_viewed_id != curr_viewed_id) { status_id = last_viewed_id; } else return; final int position = mAdapter.findItemPositionByStatusId(status_id); if (position > -1 && position < mListView.getCount()) { mListView.setSelection(position); } } @Override public void onPostStart() { if (!isActivityFirstCreated()) { getLoaderManager().restartLoader(0, null, this); } } @Override public void onPullDownToRefresh() { saveReadPosition(); new AsyncTask<Void, Void, long[][]>() { @Override protected long[][] doInBackground(final Void... params) { final long[][] result = new long[3][]; result[0] = getActivatedAccountIds(getActivity()); result[2] = getNewestStatusIds(); return result; } @Override protected void onPostExecute(final long[][] result) { getStatuses(result[0], result[1], result[2]); } }.execute(); } @Override public void onPullUpToRefresh() { saveReadPosition(); new AsyncTask<Void, Void, long[][]>() { @Override protected long[][] doInBackground(final Void... params) { final long[][] result = new long[3][]; result[0] = getActivatedAccountIds(getActivity()); result[1] = getOldestStatusIds(); return result; } @Override protected void onPostExecute(final long[][] result) { getStatuses(result[0], result[1], result[2]); } }.execute(); } @Override public void onScrollStateChanged(final AbsListView view, final int scrollState) { super.onScrollStateChanged(view, scrollState); switch (scrollState) { case SCROLL_STATE_IDLE: saveReadPosition(); break; } } @Override public void onStart() { super.onStart(); final IntentFilter filter = new IntentFilter(BROADCAST_ACCOUNT_LIST_DATABASE_UPDATED); filter.addAction(BROADCAST_FILTERS_UPDATED); registerReceiver(mStatusReceiver, filter); } @Override public void onStop() { saveReadPosition(); unregisterReceiver(mStatusReceiver); super.onStop(); } @Override public boolean onTouch(final View view, final MotionEvent ev) { switch (ev.getAction()) { case MotionEvent.ACTION_DOWN: { mTwitterWrapper.clearNotification(getNotificationIdToClear()); break; } } return false; } abstract Uri getContentUri(); @Override long[] getNewestStatusIds() { return getNewestStatusIdsFromDatabase(getActivity(), getContentUri()); } abstract int getNotificationIdToClear(); @Override long[] getOldestStatusIds() { return getOldestStatusIdsFromDatabase(getActivity(), getContentUri()); } abstract String getSavedTimelinePreferenceKey(); void saveReadPosition() { final int first_visible_position = mListView.getFirstVisiblePosition(); final long status_id = getListAdapter().findItemIdByPosition(first_visible_position); mPreferences.edit().putLong(getSavedTimelinePreferenceKey(), status_id).commit(); } }