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.feed.objects; import java.util.regex.Matcher; import java.util.regex.Pattern; import mobisocial.socialkit.Obj; import mobisocial.socialkit.SignedObj; import org.json.JSONException; import org.json.JSONObject; import android.app.Activity; import android.app.PendingIntent; import android.content.ActivityNotFoundException; import android.content.Context; import android.content.Intent; import android.net.Uri; import android.text.util.Linkify; import android.util.Log; import android.view.Gravity; import android.view.ViewGroup; import android.widget.LinearLayout; import android.widget.TextView; import android.widget.Toast; import edu.stanford.mobisocial.dungbeetle.feed.iface.Activator; import edu.stanford.mobisocial.dungbeetle.feed.iface.DbEntryHandler; import edu.stanford.mobisocial.dungbeetle.feed.iface.FeedRenderer; import edu.stanford.mobisocial.dungbeetle.model.Contact; import edu.stanford.mobisocial.dungbeetle.model.DbObject; import edu.stanford.mobisocial.dungbeetle.model.PresenceAwareNotify; public class LinkObj extends DbEntryHandler implements FeedRenderer, Activator { private static final String TAG = "dungbeetle"; public static final String TYPE = "send_file"; public static final String URI = "uri"; public static final String MIME_TYPE = "mimeType"; public static final String TITLE = "title"; @Override public String getType() { return TYPE; } public static DbObject from(String uri, String mimeType, String title) { return new DbObject(TYPE, json(uri, mimeType, title)); } public static JSONObject json(String uri, String mimeType, String title) { JSONObject obj = new JSONObject(); try { obj.put(MIME_TYPE, mimeType); obj.put(URI, uri); obj.put(TITLE, title); } catch (JSONException e) { } return obj; } public void handleDirectMessage(Context context, Contact from, JSONObject obj) { String mimeType = obj.optString(MIME_TYPE); Uri uri = Uri.parse(obj.optString(URI)); if (fileAvailable(mimeType, uri)) { Intent i = new Intent(); i.setAction(Intent.ACTION_VIEW); i.addCategory(Intent.CATEGORY_DEFAULT); i.setType(mimeType); i.setData(uri); i.putExtra(Intent.EXTRA_TEXT, uri); PendingIntent contentIntent = PendingIntent.getActivity(context, 0, i, PendingIntent.FLAG_CANCEL_CURRENT); (new PresenceAwareNotify(context)).notify("New content from Musubi", "New Content from Musubi", mimeType + " " + uri, contentIntent); } else { Log.w(TAG, "Received file, failed to handle: " + uri); } } private boolean fileAvailable(String mimeType, Uri uri) { if (uri != null && uri.getScheme().startsWith("http")) { return true; } Log.d(TAG, "TODO: Content corral for " + uri); return false; } public void render(Context context, ViewGroup frame, Obj obj, boolean allowInteractions) { JSONObject content = obj.getJson(); TextView valueTV = new TextView(context); String title; if (content.has(TITLE)) { title = "Link: " + content.optString(TITLE); } else { title = content.optString(URI); } valueTV.setText(title); valueTV.setLayoutParams(new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT)); valueTV.setGravity(Gravity.TOP | Gravity.LEFT); if (Linkify.addLinks(valueTV, Linkify.ALL)) { if (!allowInteractions) valueTV.setMovementMethod(null); } frame.addView(valueTV); } static final Pattern p = Pattern.compile("\\b[-0-9a-zA-Z+\\.]+:\\S+"); @Override public void activate(Context context, SignedObj obj) { JSONObject content = obj.getJson(); //linkify should have picked it up already but if we are in TV mode we //still need to activate Intent intent = new Intent(Intent.ACTION_VIEW); String text = content.optString(URI); //some shared links come in with two lines of text "title\nuri" //for example google maps does this and passes that same value as both the //uri and title //launch the first thing that looks like a link Matcher m = p.matcher(text); while (m.find()) { Uri uri = Uri.parse(m.group()); String scheme = uri.getScheme(); if (scheme != null && (scheme.equalsIgnoreCase("http") || scheme.equalsIgnoreCase("https"))) { String type = content.optString(MIME_TYPE); if (type != null && type.length() > 0) { intent.setDataAndType(uri, type); } else { intent.setData(uri); } if (!(context instanceof Activity)) { intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK); } try { context.startActivity(intent); } catch (ActivityNotFoundException e) { String msg; if (type != null) msg = "A third party application that supports " + type + " is required."; else msg = "A third party application that supports " + uri.getScheme() + " is required."; Toast.makeText(context, msg, Toast.LENGTH_SHORT).show(); } return; } } } }