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.io.ByteArrayOutputStream; import java.io.IOException; import java.io.InputStream; import mobisocial.socialkit.Obj; import mobisocial.socialkit.SignedObj; import org.json.JSONException; import org.json.JSONObject; import org.mobisocial.corral.ContentCorral; import org.mobisocial.corral.CorralClient; import android.app.Activity; import android.content.ContentResolver; import android.content.Context; import android.content.Intent; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.graphics.Matrix; import android.net.Uri; import android.provider.MediaStore; import android.util.Log; import android.util.Pair; import android.view.ViewGroup; import android.widget.ImageView; import android.widget.LinearLayout; import android.widget.Toast; import edu.stanford.mobisocial.dungbeetle.R; 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.feed.iface.OutgoingMessageHandler; import edu.stanford.mobisocial.dungbeetle.feed.iface.UnprocessedMessageHandler; import edu.stanford.mobisocial.dungbeetle.model.Contact; import edu.stanford.mobisocial.dungbeetle.model.DbObject; import edu.stanford.mobisocial.dungbeetle.util.Base64; import edu.stanford.mobisocial.dungbeetle.util.CommonLayouts; public class VideoObj extends DbEntryHandler implements FeedRenderer, Activator, UnprocessedMessageHandler, OutgoingMessageHandler { public static final String TAG = "VideoObj"; public static final String TYPE = "video"; public static final String DATA = "data"; public static final String MIME_TYPE = "mimeType"; public static final String LOCAL_URI = "localUri"; @Override public String getType() { return TYPE; } /** * This does NOT do any SCALING! */ public static DbObject from(byte[] data) { return new DbObject(TYPE, new JSONObject(), data); } public static DbObject from(JSONObject base, byte[] data) { return new DbObject(TYPE, base, data); } @Override public Pair<JSONObject, byte[]> splitRaw(JSONObject json) { byte[] raw = Base64.decode(json.optString(DATA)); json.remove(DATA); return new Pair<JSONObject, byte[]>(json, raw); } public static DbObject from(Context context, Uri videoUri) throws IOException { // Query gallery for camera picture via // Android ContentResolver interface ContentResolver cr = context.getContentResolver(); BitmapFactory.Options options = new BitmapFactory.Options(); options.inSampleSize = 1; long videoId = Long.parseLong(videoUri.getLastPathSegment()); Bitmap curThumb = MediaStore.Video.Thumbnails.getThumbnail(cr, videoId, MediaStore.Video.Thumbnails.MINI_KIND, options); int targetSize = 200; int width = curThumb.getWidth(); int height = curThumb.getHeight(); int cropSize = Math.min(width, height); float scaleSize = ((float) targetSize) / cropSize; Matrix matrix = new Matrix(); matrix.postScale(scaleSize, scaleSize); curThumb = Bitmap.createBitmap(curThumb, 0, 0, width, height, matrix, true); JSONObject base = new JSONObject(); String localIp = ContentCorral.getLocalIpAddress(); if (localIp != null) { try { // TODO: Security breach hack? base.put(Contact.ATTR_LAN_IP, localIp); base.put(LOCAL_URI, videoUri.toString()); base.put(MIME_TYPE, cr.getType(videoUri)); } catch (JSONException e) { Log.e(TAG, "impossible json error possible!"); } } ByteArrayOutputStream baos = new ByteArrayOutputStream(); curThumb.compress(Bitmap.CompressFormat.JPEG, 90, baos); byte[] data = baos.toByteArray(); return from(base, data); } public void render(Context context, ViewGroup frame, Obj obj, boolean allowInteractions) { JSONObject content = obj.getJson(); byte[] raw = obj.getRaw(); if (raw == null) { Pair<JSONObject, byte[]> p = splitRaw(content); content = p.first; raw = p.second; } LinearLayout inner = new LinearLayout(context); inner.setLayoutParams(CommonLayouts.FULL_WIDTH); inner.setOrientation(LinearLayout.HORIZONTAL); frame.addView(inner); ImageView imageView = new ImageView(context); imageView.setLayoutParams(new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT)); BitmapFactory bf = new BitmapFactory(); imageView.setImageBitmap(bf.decodeByteArray(raw, 0, raw.length)); inner.addView(imageView); ImageView iconView = new ImageView(context); iconView.setImageResource(R.drawable.play); iconView.setLayoutParams(new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT)); inner.addView(iconView); } public Pair<JSONObject, byte[]> handleUnprocessed(Context context, JSONObject msg) { byte[] bytes = Base64.decode(msg.optString(DATA)); msg.remove(DATA); return new Pair<JSONObject, byte[]>(msg, bytes); } @Override public void activate(final Context context, final SignedObj obj) { if (ContentCorral.CONTENT_CORRAL_ENABLED) { final CorralClient client = CorralClient.getInstance(context); Log.d(TAG, "Corraling video"); if (client.fileAvailableLocally(obj)) { try { Uri contentUri = client.fetchContent(obj); startViewer(context, contentUri); } catch (IOException e) { Log.e(TAG, "The corral tricked me", e); } } else { Log.e(TAG, "trying to pull video"); new Thread() { @Override public void run() { try { Uri contentUri = client.fetchContent(obj); startViewer(context, contentUri); } catch (IOException e) { Log.e(TAG, "Failed to corral", e); } } }.start(); } } } private void startViewer(Context context, Uri contentUri) { Log.d(TAG, "Launching viewer for " + contentUri); Intent i = new Intent(Intent.ACTION_VIEW); if (!(context instanceof Activity)) { i.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK); } i.setDataAndType(contentUri, "video/*"); context.startActivity(i); } public JSONObject mergeRaw(JSONObject objData, byte[] raw) { try { if (raw != null) objData = objData.put(DATA, Base64.encodeToString(raw, false)); } catch (JSONException e) { e.printStackTrace(); } return objData; } @Override public void handleDirectMessage(Context context, Contact from, JSONObject msg) { } private static byte[] getBytesFromFile(InputStream is) { try { ByteArrayOutputStream buffer = new ByteArrayOutputStream(); int nRead; byte[] data = new byte[16384]; while ((nRead = is.read(data, 0, data.length)) != -1) { buffer.write(data, 0, nRead); } buffer.flush(); return buffer.toByteArray(); } catch (IOException e) { Log.e(TAG, "Error reading bytes from file", e); return null; } } @Override public Pair<JSONObject, byte[]> handleOutgoing(JSONObject json) { byte[] bytes = Base64.decode(json.optString(DATA)); json.remove(DATA); return new Pair<JSONObject, byte[]>(json, bytes); } private final void toast(final Context context, final String text) { ((Activity) context).runOnUiThread(new Runnable() { @Override public void run() { Toast.makeText(context, text, Toast.LENGTH_SHORT); } }); } }