Java tutorial
/* * Copyright (C) 2011 The Stanford MobiSocial Laboratory * * This file is part of Musubi, a mobile social network. * * 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 2 * 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, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ package edu.stanford.mobisocial.dungbeetle.ui.fragments; import mobisocial.socialkit.musubi.DbObj; import android.app.Activity; import android.app.AlertDialog; import android.content.Context; import android.content.DialogInterface; import android.database.Cursor; import android.net.Uri; import android.os.Bundle; import android.support.v4.app.ListFragment; import android.support.v4.app.LoaderManager; import android.support.v4.content.CursorLoader; import android.support.v4.content.Loader; import android.util.Log; import android.view.LayoutInflater; import android.view.View; import android.view.View.OnClickListener; import android.view.ViewGroup; import android.widget.CursorAdapter; import android.widget.EditText; import android.widget.ListView; import android.widget.TextView; import edu.stanford.mobisocial.dungbeetle.DBHelper; import edu.stanford.mobisocial.dungbeetle.Helpers; import edu.stanford.mobisocial.dungbeetle.R; import edu.stanford.mobisocial.dungbeetle.feed.DbObjects; import edu.stanford.mobisocial.dungbeetle.feed.objects.StatusObj; import edu.stanford.mobisocial.dungbeetle.model.DbObject; import edu.stanford.mobisocial.dungbeetle.model.Feed; import edu.stanford.mobisocial.dungbeetle.model.Group; import edu.stanford.mobisocial.dungbeetle.util.Maybe; import edu.stanford.mobisocial.dungbeetle.util.Maybe.NoValError; /** * Displays a list of all user-accessible threads (feeds). * */ public class FeedListFragment extends ListFragment implements LoaderManager.LoaderCallbacks<Cursor> { private static final String TAG = "DungBeetle"; private FeedListCursorAdapter mFeeds; private DBHelper mHelper; private OnFeedSelectedListener mFeedSelectedListener; public interface OnFeedSelectedListener { public void onFeedSelected(Uri feedUri); } @Override public void onAttach(Activity activity) { super.onAttach(activity); try { mFeedSelectedListener = (OnFeedSelectedListener) activity; } catch (ClassCastException e) { throw new ClassCastException(activity.toString() + " must implement OnFeedSelectedListener"); } } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { return inflater.inflate(R.layout.fragment_feed_list, container, false); } @Override public void onActivityCreated(Bundle savedInstanceState) { super.onActivityCreated(savedInstanceState); if (null != getActivity().findViewById(R.id.feed_view)) { getListView().setChoiceMode(ListView.CHOICE_MODE_SINGLE); } mHelper = DBHelper.getGlobal(getActivity()); getLoaderManager().initLoader(0, null, this); } @Override public void onDetach() { super.onDetach(); } private class FeedListCursorAdapter extends CursorAdapter { public FeedListCursorAdapter(Context context, Cursor c) { super(context, c); } @Override public View newView(Context context, Cursor c, ViewGroup parent) { final LayoutInflater inflater = LayoutInflater.from(context); View v = inflater.inflate(R.layout.feed_entry, parent, false); bindView(v, context, c); return v; } @Override public void bindView(final View v, final Context context, final Cursor c) { String feedName = c.getString(c.getColumnIndexOrThrow(Group.FEED_NAME)); String groupName = c.getString(c.getColumnIndexOrThrow(Group.NAME)); int numUnread = c.getInt(c.getColumnIndexOrThrow(Group.NUM_UNREAD)); TextView labelView = (TextView) v.findViewById(R.id.feed_label); DbObject.bindView(v, context, c, false); Long groupId = c.getLong(c.getColumnIndex("group_id")); Maybe<Group> mg = Group.forId(context, groupId); v.setTag(R.id.feed_label, feedName); if (groupName != null) { try { Group g = mg.get(); v.setTag(R.id.group_name, g.name); v.setTag(R.id.group_id, g.id); v.setTag(R.id.group_uri, g.dynUpdateUri); if (numUnread > 0) { labelView.setText(g.name + " (" + numUnread + " unread)"); } else { labelView.setText(g.name); } } catch (NoValError e) { Log.w(TAG, "maybe... not"); } } else { if (numUnread > 0) { labelView.setText(feedName + " (" + numUnread + " unread)"); } else { labelView.setText(feedName); } } int color = Feed.colorFor(feedName); labelView.setBackgroundColor(color); //v.setBackgroundColor(color); //v.getBackground().setAlpha(Feed.BACKGROUND_ALPHA); } } @Override public void onListItemClick(ListView l, View v, int position, long id) { getListView().setItemChecked(position, true); String feedName = (String) v.getTag(R.id.feed_label); while (feedName == null) { v = (View) v.getParent(); if (v == null) { Log.w(TAG, "No feed information found."); break; } feedName = (String) v.getTag(R.id.feed_label); } Uri feedUri = Feed.uriForName(feedName); mFeedSelectedListener.onFeedSelected(feedUri); } private String getFeedObjectClause() { // TODO: Enumerate all Object classes, look for FeedRenderables. String[] types = DbObjects.getRenderableTypes(); StringBuffer allowed = new StringBuffer(); for (String type : types) { allowed.append(",'").append(type).append("'"); } return DbObject.TYPE + " in (" + allowed.substring(1) + ") AND " + DbObject.TABLE + "." + DbObject.FEED_NAME + " NOT IN ('direct', 'friend', '')"; } @SuppressWarnings("unused") private OnClickListener newFeed() { return new OnClickListener() { @Override public void onClick(View v) { AlertDialog.Builder alert = new AlertDialog.Builder(getActivity()); alert.setMessage("Enter group name:"); final EditText input = new EditText(getActivity()); alert.setView(input); alert.setPositiveButton("Ok", new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int whichButton) { String groupName = input.getText().toString(); Group g; if (groupName.length() > 0) { g = Group.create(getActivity(), groupName, mHelper); } else { g = Group.create(getActivity()); } Helpers.sendToFeed(getActivity(), StatusObj.from("Welcome to " + g.name + "!"), Feed.uriForName(g.feedName)); } }); alert.setNegativeButton("Cancel", new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int whichButton) { } }); alert.show(); } }; } private Loader<Cursor> mLoader; @Override public Loader<Cursor> onCreateLoader(int id, Bundle args) { if (mLoader == null) { mLoader = new CursorLoader(getActivity(), Feed.feedListUri(), new String[] { DbObject.TABLE + "." + DbObj.COL_ID + " as " + DbObj.COL_ID, Group.TABLE + "." + Group.FEED_NAME + " as " + Group.FEED_NAME, Group.TABLE + "." + Group.NAME + " as " + Group.NAME, Group.TABLE + "." + Group.NUM_UNREAD + " as " + Group.NUM_UNREAD, Group.TABLE + "." + Group._ID + " as group_id" }, getFeedObjectClause(), null, null); } return mLoader; } @Override public void onLoadFinished(Loader<Cursor> loader, Cursor cursor) { if (mFeeds == null) { mFeeds = new FeedListCursorAdapter(getActivity(), cursor); setListAdapter(mFeeds); } else { mFeeds.changeCursor(cursor); } } @Override public void onLoaderReset(Loader<Cursor> arg0) { } }