1package eu.siacs.conversations.ui.adapter;
   2
   3import android.content.ActivityNotFoundException;
   4import android.content.Intent;
   5import android.content.pm.PackageManager;
   6import android.content.pm.ResolveInfo;
   7import android.content.res.Resources;
   8import android.graphics.Bitmap;
   9import android.graphics.Typeface;
  10import android.graphics.drawable.BitmapDrawable;
  11import android.graphics.drawable.Drawable;
  12import android.net.Uri;
  13import android.os.AsyncTask;
  14import android.support.v4.content.ContextCompat;
  15import android.text.Spannable;
  16import android.text.SpannableString;
  17import android.text.SpannableStringBuilder;
  18import android.text.Spanned;
  19import android.text.format.DateUtils;
  20import android.text.style.ForegroundColorSpan;
  21import android.text.style.RelativeSizeSpan;
  22import android.text.style.StyleSpan;
  23import android.text.util.Linkify;
  24import android.util.DisplayMetrics;
  25import android.view.ActionMode;
  26import android.view.Menu;
  27import android.view.MenuItem;
  28import android.view.View;
  29import android.view.View.OnClickListener;
  30import android.view.View.OnLongClickListener;
  31import android.view.ViewGroup;
  32import android.widget.ArrayAdapter;
  33import android.widget.Button;
  34import android.widget.ImageView;
  35import android.widget.LinearLayout;
  36import android.widget.RelativeLayout;
  37import android.widget.TextView;
  38import android.widget.Toast;
  39
  40import java.lang.ref.WeakReference;
  41import java.net.URL;
  42import java.util.List;
  43import java.util.Locale;
  44import java.util.concurrent.RejectedExecutionException;
  45import java.util.regex.Matcher;
  46import java.util.regex.Pattern;
  47
  48import eu.siacs.conversations.Config;
  49import eu.siacs.conversations.R;
  50import eu.siacs.conversations.crypto.axolotl.FingerprintStatus;
  51import eu.siacs.conversations.entities.Account;
  52import eu.siacs.conversations.entities.Conversation;
  53import eu.siacs.conversations.entities.DownloadableFile;
  54import eu.siacs.conversations.entities.Message;
  55import eu.siacs.conversations.entities.Message.FileParams;
  56import eu.siacs.conversations.entities.Transferable;
  57import eu.siacs.conversations.persistance.FileBackend;
  58import eu.siacs.conversations.services.MessageArchiveService;
  59import eu.siacs.conversations.services.NotificationService;
  60import eu.siacs.conversations.ui.ConversationActivity;
  61import eu.siacs.conversations.ui.service.AudioPlayer;
  62import eu.siacs.conversations.ui.text.DividerSpan;
  63import eu.siacs.conversations.ui.text.QuoteSpan;
  64import eu.siacs.conversations.ui.widget.ClickableMovementMethod;
  65import eu.siacs.conversations.ui.widget.CopyTextView;
  66import eu.siacs.conversations.ui.widget.ListSelectionManager;
  67import eu.siacs.conversations.utils.CryptoHelper;
  68import eu.siacs.conversations.utils.Emoticons;
  69import eu.siacs.conversations.utils.GeoHelper;
  70import eu.siacs.conversations.utils.Patterns;
  71import eu.siacs.conversations.utils.StylingHelper;
  72import eu.siacs.conversations.utils.UIHelper;
  73import eu.siacs.conversations.xmpp.mam.MamReference;
  74
  75public class MessageAdapter extends ArrayAdapter<Message> implements CopyTextView.CopyHandler {
  76
  77	private static final int SENT = 0;
  78	private static final int RECEIVED = 1;
  79	private static final int STATUS = 2;
  80	private static final int DATE_SEPARATOR = 3;
  81
  82	public static final String DATE_SEPARATOR_BODY = "DATE_SEPARATOR";
  83
  84	private static final Pattern XMPP_PATTERN = Pattern
  85			.compile("xmpp\\:(?:(?:["
  86					+ Patterns.GOOD_IRI_CHAR
  87					+ "\\;\\/\\?\\@\\&\\=\\#\\~\\-\\.\\+\\!\\*\\'\\(\\)\\,\\_])"
  88					+ "|(?:\\%[a-fA-F0-9]{2}))+");
  89
  90	private static final Linkify.TransformFilter WEBURL_TRANSFORM_FILTER = new Linkify.TransformFilter() {
  91		@Override
  92		public String transformUrl(Matcher matcher, String url) {
  93			if (url == null) {
  94				return null;
  95			}
  96			final String lcUrl = url.toLowerCase(Locale.US);
  97			if (lcUrl.startsWith("http://") || lcUrl.startsWith("https://")) {
  98				return url;
  99			} else {
 100				return "http://"+url;
 101			}
 102		}
 103	};
 104	private static final Linkify.MatchFilter WEBURL_MATCH_FILTER = new Linkify.MatchFilter() {
 105		@Override
 106		public boolean acceptMatch(CharSequence cs, int start, int end) {
 107			return start < 1 || (cs.charAt(start-1) != '@' && cs.charAt(start-1) != '.' && !cs.subSequence(Math.max(0,start - 3),start).equals("://"));
 108		}
 109	};
 110
 111	private final ConversationActivity activity;
 112
 113	private DisplayMetrics metrics;
 114
 115	private OnContactPictureClicked mOnContactPictureClickedListener;
 116	private OnContactPictureLongClicked mOnContactPictureLongClickedListener;
 117
 118	private boolean mIndicateReceived = false;
 119	private boolean mUseGreenBackground = false;
 120
 121	private OnQuoteListener onQuoteListener;
 122
 123	private final ListSelectionManager listSelectionManager = new ListSelectionManager();
 124
 125	private final AudioPlayer audioPlayer;
 126
 127	public MessageAdapter(ConversationActivity activity, List<Message> messages) {
 128		super(activity, 0, messages);
 129		this.audioPlayer = new AudioPlayer(this);
 130		this.activity = activity;
 131		metrics = getContext().getResources().getDisplayMetrics();
 132		updatePreferences();
 133	}
 134
 135	public void setOnContactPictureClicked(OnContactPictureClicked listener) {
 136		this.mOnContactPictureClickedListener = listener;
 137	}
 138
 139	public void setOnContactPictureLongClicked(
 140			OnContactPictureLongClicked listener) {
 141		this.mOnContactPictureLongClickedListener = listener;
 142			}
 143
 144	public void setOnQuoteListener(OnQuoteListener listener) {
 145		this.onQuoteListener = listener;
 146	}
 147
 148	@Override
 149	public int getViewTypeCount() {
 150		return 4;
 151	}
 152
 153	public int getItemViewType(Message message) {
 154		if (message.getType() == Message.TYPE_STATUS) {
 155			if (DATE_SEPARATOR_BODY.equals(message.getBody())) {
 156				return DATE_SEPARATOR;
 157			} else {
 158				return STATUS;
 159			}
 160		} else if (message.getStatus() <= Message.STATUS_RECEIVED) {
 161			return RECEIVED;
 162		}
 163
 164		return SENT;
 165	}
 166
 167	@Override
 168	public int getItemViewType(int position) {
 169		return this.getItemViewType(getItem(position));
 170	}
 171
 172	public int getMessageTextColor(boolean onDark, boolean primary) {
 173		if (onDark) {
 174			return ContextCompat.getColor(activity, primary ? R.color.white : R.color.white70);
 175		} else {
 176			return ContextCompat.getColor(activity, primary ? R.color.black87 : R.color.black54);
 177		}
 178	}
 179
 180	private void displayStatus(ViewHolder viewHolder, Message message, int type, boolean darkBackground) {
 181		String filesize = null;
 182		String info = null;
 183		boolean error = false;
 184		if (viewHolder.indicatorReceived != null) {
 185			viewHolder.indicatorReceived.setVisibility(View.GONE);
 186		}
 187
 188		if (viewHolder.edit_indicator != null) {
 189			if (message.edited()) {
 190				viewHolder.edit_indicator.setVisibility(View.VISIBLE);
 191				viewHolder.edit_indicator.setImageResource(darkBackground ? R.drawable.ic_mode_edit_white_18dp : R.drawable.ic_mode_edit_black_18dp);
 192				viewHolder.edit_indicator.setAlpha(darkBackground ? 0.7f : 0.57f);
 193			} else {
 194				viewHolder.edit_indicator.setVisibility(View.GONE);
 195			}
 196		}
 197		boolean multiReceived = message.getConversation().getMode() == Conversation.MODE_MULTI
 198			&& message.getMergedStatus() <= Message.STATUS_RECEIVED;
 199		if (message.getType() == Message.TYPE_IMAGE || message.getType() == Message.TYPE_FILE || message.getTransferable() != null) {
 200			FileParams params = message.getFileParams();
 201			if (params.size > (1.5 * 1024 * 1024)) {
 202				filesize = Math.round(params.size * 1f/ (1024 * 1024))+ " MiB";
 203			} else if (params.size >= 1024) {
 204				filesize = Math.round(params.size * 1f/ 1024) + " KiB";
 205			} else if (params.size > 0){
 206				filesize = params.size + " B";
 207			}
 208			if (message.getTransferable() != null && message.getTransferable().getStatus() == Transferable.STATUS_FAILED) {
 209				error = true;
 210			}
 211		}
 212		switch (message.getMergedStatus()) {
 213			case Message.STATUS_WAITING:
 214				info = getContext().getString(R.string.waiting);
 215				break;
 216			case Message.STATUS_UNSEND:
 217				Transferable d = message.getTransferable();
 218				if (d!=null) {
 219					info = getContext().getString(R.string.sending_file,d.getProgress());
 220				} else {
 221					info = getContext().getString(R.string.sending);
 222				}
 223				break;
 224			case Message.STATUS_OFFERED:
 225				info = getContext().getString(R.string.offering);
 226				break;
 227			case Message.STATUS_SEND_RECEIVED:
 228				if (mIndicateReceived) {
 229					viewHolder.indicatorReceived.setVisibility(View.VISIBLE);
 230				}
 231				break;
 232			case Message.STATUS_SEND_DISPLAYED:
 233				if (mIndicateReceived) {
 234					viewHolder.indicatorReceived.setVisibility(View.VISIBLE);
 235				}
 236				break;
 237			case Message.STATUS_SEND_FAILED:
 238				info = getContext().getString(R.string.send_failed);
 239				error = true;
 240				break;
 241			default:
 242				if (multiReceived) {
 243					info = UIHelper.getMessageDisplayName(message);
 244				}
 245				break;
 246		}
 247		if (error && type == SENT) {
 248			viewHolder.time.setTextColor(activity.getWarningTextColor());
 249		} else {
 250			viewHolder.time.setTextColor(this.getMessageTextColor(darkBackground,false));
 251		}
 252		if (message.getEncryption() == Message.ENCRYPTION_NONE) {
 253			viewHolder.indicator.setVisibility(View.GONE);
 254		} else {
 255			boolean verified = false;
 256			if (message.getEncryption() == Message.ENCRYPTION_AXOLOTL) {
 257				final FingerprintStatus status = message.getConversation()
 258						.getAccount().getAxolotlService().getFingerprintTrust(
 259								message.getFingerprint());
 260				if (status != null && status.isVerified()) {
 261					verified = true;
 262				}
 263			}
 264			if (verified) {
 265				viewHolder.indicator.setImageResource(darkBackground ? R.drawable.ic_verified_user_white_18dp : R.drawable.ic_verified_user_black_18dp);
 266			} else {
 267				viewHolder.indicator.setImageResource(darkBackground ? R.drawable.ic_lock_white_18dp : R.drawable.ic_lock_black_18dp);
 268			}
 269			if (darkBackground) {
 270				viewHolder.indicator.setAlpha(0.7f);
 271			} else {
 272				viewHolder.indicator.setAlpha(0.57f);
 273			}
 274			viewHolder.indicator.setVisibility(View.VISIBLE);
 275		}
 276
 277		String formatedTime = UIHelper.readableTimeDifferenceFull(getContext(),
 278				message.getMergedTimeSent());
 279		if (message.getStatus() <= Message.STATUS_RECEIVED) {
 280			if ((filesize != null) && (info != null)) {
 281				viewHolder.time.setText(formatedTime + " \u00B7 " + filesize +" \u00B7 " + info);
 282			} else if ((filesize == null) && (info != null)) {
 283				viewHolder.time.setText(formatedTime + " \u00B7 " + info);
 284			} else if ((filesize != null) && (info == null)) {
 285				viewHolder.time.setText(formatedTime + " \u00B7 " + filesize);
 286			} else {
 287				viewHolder.time.setText(formatedTime);
 288			}
 289		} else {
 290			if ((filesize != null) && (info != null)) {
 291				viewHolder.time.setText(filesize + " \u00B7 " + info);
 292			} else if ((filesize == null) && (info != null)) {
 293				if (error) {
 294					viewHolder.time.setText(info + " \u00B7 " + formatedTime);
 295				} else {
 296					viewHolder.time.setText(info);
 297				}
 298			} else if ((filesize != null) && (info == null)) {
 299				viewHolder.time.setText(filesize + " \u00B7 " + formatedTime);
 300			} else {
 301				viewHolder.time.setText(formatedTime);
 302			}
 303		}
 304	}
 305
 306	private void displayInfoMessage(ViewHolder viewHolder, String text, boolean darkBackground) {
 307		viewHolder.download_button.setVisibility(View.GONE);
 308		viewHolder.audioPlayer.setVisibility(View.GONE);
 309		viewHolder.image.setVisibility(View.GONE);
 310		viewHolder.messageBody.setVisibility(View.VISIBLE);
 311		viewHolder.messageBody.setText(text);
 312		viewHolder.messageBody.setTextColor(getMessageTextColor(darkBackground, false));
 313		viewHolder.messageBody.setTypeface(null, Typeface.ITALIC);
 314		viewHolder.messageBody.setTextIsSelectable(false);
 315	}
 316
 317	private void displayDecryptionFailed(ViewHolder viewHolder, boolean darkBackground) {
 318		viewHolder.download_button.setVisibility(View.GONE);
 319		viewHolder.image.setVisibility(View.GONE);
 320		viewHolder.audioPlayer.setVisibility(View.GONE);
 321		viewHolder.messageBody.setVisibility(View.VISIBLE);
 322		viewHolder.messageBody.setText(getContext().getString(
 323				R.string.decryption_failed));
 324		viewHolder.messageBody.setTextColor(getMessageTextColor(darkBackground, false));
 325		viewHolder.messageBody.setTypeface(null, Typeface.NORMAL);
 326		viewHolder.messageBody.setTextIsSelectable(false);
 327	}
 328
 329	private void displayEmojiMessage(final ViewHolder viewHolder, final String body) {
 330		viewHolder.download_button.setVisibility(View.GONE);
 331		viewHolder.audioPlayer.setVisibility(View.GONE);
 332		viewHolder.image.setVisibility(View.GONE);
 333		viewHolder.messageBody.setVisibility(View.VISIBLE);
 334		Spannable span = new SpannableString(body);
 335		float size = Emoticons.isEmoji(body) ? 3.0f : 2.0f;
 336		span.setSpan(new RelativeSizeSpan(size), 0, body.length(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
 337		viewHolder.messageBody.setText(span);
 338	}
 339
 340	private int applyQuoteSpan(SpannableStringBuilder body, int start, int end, boolean darkBackground) {
 341		if (start > 1 && !"\n\n".equals(body.subSequence(start - 2, start).toString())) {
 342			body.insert(start++, "\n");
 343			body.setSpan(new DividerSpan(false), start - 2, start, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
 344			end++;
 345		}
 346		if (end < body.length() - 1 && !"\n\n".equals(body.subSequence(end, end + 2).toString())) {
 347			body.insert(end, "\n");
 348			body.setSpan(new DividerSpan(false), end, end + 2, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
 349		}
 350		int color = darkBackground ? this.getMessageTextColor(darkBackground, false)
 351				: ContextCompat.getColor(activity, R.color.bubble);
 352		DisplayMetrics metrics = getContext().getResources().getDisplayMetrics();
 353		body.setSpan(new QuoteSpan(color, metrics), start, end, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
 354		return 0;
 355	}
 356
 357	/**
 358	 * Applies QuoteSpan to group of lines which starts with > or » characters.
 359	 * Appends likebreaks and applies DividerSpan to them to show a padding between quote and text.
 360	 */
 361	private boolean handleTextQuotes(SpannableStringBuilder body, boolean darkBackground) {
 362		boolean startsWithQuote = false;
 363		char previous = '\n';
 364		int lineStart = -1;
 365		int lineTextStart = -1;
 366		int quoteStart = -1;
 367		for (int i = 0; i <= body.length(); i++) {
 368			char current = body.length() > i ? body.charAt(i) : '\n';
 369			if (lineStart == -1) {
 370				if (previous == '\n') {
 371					if ((current == '>' && UIHelper.isPositionFollowedByQuoteableCharacter(body,i))
 372							|| current == '\u00bb' && !UIHelper.isPositionFollowedByQuote(body,i)) {
 373						// Line start with quote
 374						lineStart = i;
 375						if (quoteStart == -1) quoteStart = i;
 376						if (i == 0) startsWithQuote = true;
 377					} else if (quoteStart >= 0) {
 378						// Line start without quote, apply spans there
 379						applyQuoteSpan(body, quoteStart, i - 1, darkBackground);
 380						quoteStart = -1;
 381					}
 382				}
 383			} else {
 384				// Remove extra spaces between > and first character in the line
 385				// > character will be removed too
 386				if (current != ' ' && lineTextStart == -1) {
 387					lineTextStart = i;
 388				}
 389				if (current == '\n') {
 390					body.delete(lineStart, lineTextStart);
 391					i -= lineTextStart - lineStart;
 392					if (i == lineStart) {
 393						// Avoid empty lines because span over empty line can be hidden
 394						body.insert(i++, " ");
 395					}
 396					lineStart = -1;
 397					lineTextStart = -1;
 398				}
 399			}
 400			previous = current;
 401		}
 402		if (quoteStart >= 0) {
 403			// Apply spans to finishing open quote
 404			applyQuoteSpan(body, quoteStart, body.length(), darkBackground);
 405		}
 406		return startsWithQuote;
 407	}
 408
 409	private void displayTextMessage(final ViewHolder viewHolder, final Message message, boolean darkBackground, int type) {
 410		viewHolder.download_button.setVisibility(View.GONE);
 411		viewHolder.image.setVisibility(View.GONE);
 412		viewHolder.audioPlayer.setVisibility(View.GONE);
 413		viewHolder.messageBody.setVisibility(View.VISIBLE);
 414
 415		viewHolder.messageBody.setTextColor(this.getMessageTextColor(darkBackground, true));
 416		viewHolder.messageBody.setLinkTextColor(this.getMessageTextColor(darkBackground, true));
 417		viewHolder.messageBody.setHighlightColor(ContextCompat.getColor(activity, darkBackground
 418				? (type == SENT || !mUseGreenBackground ? R.color.black26 : R.color.grey800) : R.color.grey500));
 419		viewHolder.messageBody.setTypeface(null, Typeface.NORMAL);
 420
 421		if (message.getBody() != null) {
 422			final String nick = UIHelper.getMessageDisplayName(message);
 423			SpannableStringBuilder body = message.getMergedBody();
 424			boolean hasMeCommand = message.hasMeCommand();
 425			if (hasMeCommand) {
 426				body = body.replace(0, Message.ME_COMMAND.length(), nick + " ");
 427			}
 428			if (body.length() > Config.MAX_DISPLAY_MESSAGE_CHARS) {
 429				body = new SpannableStringBuilder(body, 0, Config.MAX_DISPLAY_MESSAGE_CHARS);
 430				body.append("\u2026");
 431			}
 432			Message.MergeSeparator[] mergeSeparators = body.getSpans(0, body.length(), Message.MergeSeparator.class);
 433			for (Message.MergeSeparator mergeSeparator : mergeSeparators) {
 434				int start = body.getSpanStart(mergeSeparator);
 435				int end = body.getSpanEnd(mergeSeparator);
 436				body.setSpan(new DividerSpan(true), start, end, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
 437			}
 438			boolean startsWithQuote = handleTextQuotes(body, darkBackground);
 439			if (message.getType() != Message.TYPE_PRIVATE) {
 440				if (hasMeCommand) {
 441					body.setSpan(new StyleSpan(Typeface.BOLD_ITALIC), 0, nick.length(),
 442							Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
 443				}
 444			} else {
 445				String privateMarker;
 446				if (message.getStatus() <= Message.STATUS_RECEIVED) {
 447					privateMarker = activity.getString(R.string.private_message);
 448				} else {
 449					final String to;
 450					if (message.getCounterpart() != null) {
 451						to = message.getCounterpart().getResourcepart();
 452					} else {
 453						to = "";
 454					}
 455					privateMarker = activity.getString(R.string.private_message_to, to);
 456				}
 457				body.insert(0, privateMarker);
 458				int privateMarkerIndex = privateMarker.length();
 459				if (startsWithQuote) {
 460					body.insert(privateMarkerIndex, "\n\n");
 461					body.setSpan(new DividerSpan(false), privateMarkerIndex, privateMarkerIndex + 2,
 462							Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
 463				} else {
 464					body.insert(privateMarkerIndex, " ");
 465				}
 466				body.setSpan(new ForegroundColorSpan(getMessageTextColor(darkBackground, false)),
 467						0, privateMarkerIndex, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
 468				body.setSpan(new StyleSpan(Typeface.BOLD),
 469						0, privateMarkerIndex, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
 470				if (hasMeCommand) {
 471					body.setSpan(new StyleSpan(Typeface.BOLD_ITALIC), privateMarkerIndex + 1,
 472							privateMarkerIndex + 1 + nick.length(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
 473				}
 474			}
 475			if (message.getConversation().getMode() == Conversation.MODE_MULTI && message.getStatus() == Message.STATUS_RECEIVED) {
 476				Pattern pattern = NotificationService.generateNickHighlightPattern(message.getConversation().getMucOptions().getActualNick());
 477				Matcher matcher = pattern.matcher(body);
 478				while(matcher.find()) {
 479					body.setSpan(new StyleSpan(Typeface.BOLD), matcher.start(), matcher.end(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
 480				}
 481			}
 482			Matcher matcher = Emoticons.generatePattern(body).matcher(body);
 483			while(matcher.find()) {
 484				body.setSpan(new RelativeSizeSpan(1.2f), matcher.start(), matcher.end(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
 485			}
 486
 487			StylingHelper.format(body, viewHolder.messageBody.getCurrentTextColor());
 488
 489			Linkify.addLinks(body, XMPP_PATTERN, "xmpp");
 490			Linkify.addLinks(body, Patterns.AUTOLINK_WEB_URL, "http", WEBURL_MATCH_FILTER, WEBURL_TRANSFORM_FILTER);
 491			Linkify.addLinks(body, GeoHelper.GEO_URI, "geo");
 492			viewHolder.messageBody.setAutoLinkMask(0);
 493			viewHolder.messageBody.setText(body);
 494			viewHolder.messageBody.setTextIsSelectable(true);
 495			viewHolder.messageBody.setMovementMethod(ClickableMovementMethod.getInstance());
 496			listSelectionManager.onUpdate(viewHolder.messageBody, message);
 497		} else {
 498			viewHolder.messageBody.setText("");
 499			viewHolder.messageBody.setTextIsSelectable(false);
 500		}
 501	}
 502
 503	private void displayDownloadableMessage(ViewHolder viewHolder, final Message message, String text) {
 504		viewHolder.image.setVisibility(View.GONE);
 505		viewHolder.messageBody.setVisibility(View.GONE);
 506		viewHolder.audioPlayer.setVisibility(View.GONE);
 507		viewHolder.download_button.setVisibility(View.VISIBLE);
 508		viewHolder.download_button.setText(text);
 509		viewHolder.download_button.setOnClickListener(new OnClickListener() {
 510
 511			@Override
 512			public void onClick(View v) {
 513				activity.startDownloadable(message);
 514			}
 515		});
 516	}
 517
 518	private void displayOpenableMessage(ViewHolder viewHolder,final Message message) {
 519		viewHolder.image.setVisibility(View.GONE);
 520		viewHolder.messageBody.setVisibility(View.GONE);
 521		viewHolder.audioPlayer.setVisibility(View.GONE);
 522		viewHolder.download_button.setVisibility(View.VISIBLE);
 523		viewHolder.download_button.setText(activity.getString(R.string.open_x_file, UIHelper.getFileDescriptionString(activity, message)));
 524		viewHolder.download_button.setOnClickListener(new OnClickListener() {
 525
 526			@Override
 527			public void onClick(View v) {
 528				openDownloadable(message);
 529			}
 530		});
 531	}
 532
 533	private void displayLocationMessage(ViewHolder viewHolder, final Message message) {
 534		viewHolder.image.setVisibility(View.GONE);
 535		viewHolder.messageBody.setVisibility(View.GONE);
 536		viewHolder.audioPlayer.setVisibility(View.GONE);
 537		viewHolder.download_button.setVisibility(View.VISIBLE);
 538		viewHolder.download_button.setText(R.string.show_location);
 539		viewHolder.download_button.setOnClickListener(new OnClickListener() {
 540
 541			@Override
 542			public void onClick(View v) {
 543				showLocation(message);
 544			}
 545		});
 546	}
 547
 548	private void displayAudioMessage(ViewHolder viewHolder, Message message, boolean darkBackground) {
 549		viewHolder.image.setVisibility(View.GONE);
 550		viewHolder.messageBody.setVisibility(View.GONE);
 551		viewHolder.download_button.setVisibility(View.GONE);
 552		final RelativeLayout audioPlayer = viewHolder.audioPlayer;
 553		audioPlayer.setVisibility(View.VISIBLE);
 554		AudioPlayer.ViewHolder.get(audioPlayer).setDarkBackground(darkBackground);
 555		this.audioPlayer.init(audioPlayer, message);
 556	}
 557
 558
 559	private void displayImageMessage(ViewHolder viewHolder, final Message message) {
 560		viewHolder.download_button.setVisibility(View.GONE);
 561		viewHolder.messageBody.setVisibility(View.GONE);
 562		viewHolder.audioPlayer.setVisibility(View.GONE);
 563		viewHolder.image.setVisibility(View.VISIBLE);
 564		FileParams params = message.getFileParams();
 565		double target = metrics.density * 288;
 566		int scaledW;
 567		int scaledH;
 568		if (Math.max(params.height, params.width) * metrics.density <= target) {
 569			scaledW = (int) (params.width * metrics.density);
 570			scaledH = (int) (params.height * metrics.density);
 571		} else if (Math.max(params.height,params.width) <= target) {
 572			scaledW = params.width;
 573			scaledH = params.height;
 574		} else if (params.width <= params.height) {
 575			scaledW = (int) (params.width / ((double) params.height / target));
 576			scaledH = (int) target;
 577		} else {
 578			scaledW = (int) target;
 579			scaledH = (int) (params.height / ((double) params.width / target));
 580		}
 581		LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(scaledW, scaledH);
 582		layoutParams.setMargins(0, (int) (metrics.density * 4), 0, (int) (metrics.density * 4));
 583		viewHolder.image.setLayoutParams(layoutParams);
 584		activity.loadBitmap(message, viewHolder.image);
 585		viewHolder.image.setOnClickListener(new OnClickListener() {
 586
 587			@Override
 588			public void onClick(View v) {
 589				openDownloadable(message);
 590			}
 591		});
 592	}
 593
 594	private void loadMoreMessages(Conversation conversation) {
 595		conversation.setLastClearHistory(0,null);
 596		activity.xmppConnectionService.updateConversation(conversation);
 597		conversation.setHasMessagesLeftOnServer(true);
 598		conversation.setFirstMamReference(null);
 599		long timestamp = conversation.getLastMessageTransmitted().getTimestamp();
 600		if (timestamp == 0) {
 601			timestamp = System.currentTimeMillis();
 602		}
 603		conversation.messagesLoaded.set(true);
 604		MessageArchiveService.Query query = activity.xmppConnectionService.getMessageArchiveService().query(conversation, new MamReference(0), timestamp, false);
 605		if (query != null) {
 606			Toast.makeText(activity, R.string.fetching_history_from_server, Toast.LENGTH_LONG).show();
 607		} else {
 608			Toast.makeText(activity,R.string.not_fetching_history_retention_period, Toast.LENGTH_SHORT).show();
 609		}
 610	}
 611
 612	@Override
 613	public View getView(int position, View view, ViewGroup parent) {
 614		final Message message = getItem(position);
 615		final boolean omemoEncryption = message.getEncryption() == Message.ENCRYPTION_AXOLOTL;
 616		final boolean isInValidSession = message.isValidInSession() && (!omemoEncryption || message.isTrusted());
 617		final Conversation conversation = message.getConversation();
 618		final Account account = conversation.getAccount();
 619		final int type = getItemViewType(position);
 620		ViewHolder viewHolder;
 621		if (view == null) {
 622			viewHolder = new ViewHolder();
 623			switch (type) {
 624				case DATE_SEPARATOR:
 625					view = activity.getLayoutInflater().inflate(R.layout.message_date_bubble, parent, false);
 626					viewHolder.status_message = (TextView) view.findViewById(R.id.message_body);
 627					viewHolder.message_box = (LinearLayout) view.findViewById(R.id.message_box);
 628					break;
 629				case SENT:
 630					view = activity.getLayoutInflater().inflate(
 631							R.layout.message_sent, parent, false);
 632					viewHolder.message_box = (LinearLayout) view
 633						.findViewById(R.id.message_box);
 634					viewHolder.contact_picture = (ImageView) view
 635						.findViewById(R.id.message_photo);
 636					viewHolder.download_button = (Button) view
 637						.findViewById(R.id.download_button);
 638					viewHolder.indicator = (ImageView) view
 639						.findViewById(R.id.security_indicator);
 640					viewHolder.edit_indicator = (ImageView) view.findViewById(R.id.edit_indicator);
 641					viewHolder.image = (ImageView) view
 642						.findViewById(R.id.message_image);
 643					viewHolder.messageBody = (CopyTextView) view
 644						.findViewById(R.id.message_body);
 645					viewHolder.time = (TextView) view
 646						.findViewById(R.id.message_time);
 647					viewHolder.indicatorReceived = (ImageView) view
 648						.findViewById(R.id.indicator_received);
 649					viewHolder.audioPlayer = (RelativeLayout) view.findViewById(R.id.audio_player);
 650					break;
 651				case RECEIVED:
 652					view = activity.getLayoutInflater().inflate(
 653							R.layout.message_received, parent, false);
 654					viewHolder.message_box = (LinearLayout) view
 655						.findViewById(R.id.message_box);
 656					viewHolder.contact_picture = (ImageView) view
 657						.findViewById(R.id.message_photo);
 658					viewHolder.download_button = (Button) view
 659						.findViewById(R.id.download_button);
 660					viewHolder.indicator = (ImageView) view
 661						.findViewById(R.id.security_indicator);
 662					viewHolder.edit_indicator = (ImageView) view.findViewById(R.id.edit_indicator);
 663					viewHolder.image = (ImageView) view
 664						.findViewById(R.id.message_image);
 665					viewHolder.messageBody = (CopyTextView) view
 666						.findViewById(R.id.message_body);
 667					viewHolder.time = (TextView) view
 668						.findViewById(R.id.message_time);
 669					viewHolder.indicatorReceived = (ImageView) view
 670						.findViewById(R.id.indicator_received);
 671					viewHolder.encryption = (TextView) view.findViewById(R.id.message_encryption);
 672					viewHolder.audioPlayer = (RelativeLayout) view.findViewById(R.id.audio_player);
 673					break;
 674				case STATUS:
 675					view = activity.getLayoutInflater().inflate(R.layout.message_status, parent, false);
 676					viewHolder.contact_picture = (ImageView) view.findViewById(R.id.message_photo);
 677					viewHolder.status_message = (TextView) view.findViewById(R.id.status_message);
 678					viewHolder.load_more_messages = (Button) view.findViewById(R.id.load_more_messages);
 679					break;
 680				default:
 681					throw new AssertionError("Unknown view type");
 682			}
 683			if (viewHolder.messageBody != null) {
 684				listSelectionManager.onCreate(viewHolder.messageBody,
 685						new MessageBodyActionModeCallback(viewHolder.messageBody));
 686				viewHolder.messageBody.setCopyHandler(this);
 687			}
 688			view.setTag(viewHolder);
 689		} else {
 690			viewHolder = (ViewHolder) view.getTag();
 691			if (viewHolder == null) {
 692				return view;
 693			}
 694		}
 695
 696		boolean darkBackground = type == RECEIVED && (!isInValidSession || mUseGreenBackground) || activity.isDarkTheme();
 697
 698		if (type == DATE_SEPARATOR) {
 699			if (UIHelper.today(message.getTimeSent())) {
 700				viewHolder.status_message.setText(R.string.today);
 701			} else if (UIHelper.yesterday(message.getTimeSent())) {
 702				viewHolder.status_message.setText(R.string.yesterday);
 703			} else {
 704				viewHolder.status_message.setText(DateUtils.formatDateTime(activity,message.getTimeSent(),DateUtils.FORMAT_SHOW_DATE | DateUtils.FORMAT_SHOW_YEAR));
 705			}
 706			viewHolder.message_box.setBackgroundResource(activity.isDarkTheme() ? R.drawable.date_bubble_grey : R.drawable.date_bubble_white);
 707			viewHolder.status_message.setTextColor(activity.getSecondaryTextColor());
 708			return view;
 709		} else if (type == STATUS) {
 710			if ("LOAD_MORE".equals(message.getBody())) {
 711				viewHolder.status_message.setVisibility(View.GONE);
 712				viewHolder.contact_picture.setVisibility(View.GONE);
 713				viewHolder.load_more_messages.setVisibility(View.VISIBLE);
 714				viewHolder.load_more_messages.setOnClickListener(new OnClickListener() {
 715					@Override
 716					public void onClick(View v) {
 717						loadMoreMessages(message.getConversation());
 718					}
 719				});
 720			} else {
 721				viewHolder.status_message.setVisibility(View.VISIBLE);
 722				viewHolder.load_more_messages.setVisibility(View.GONE);
 723				viewHolder.status_message.setText(message.getBody());
 724				boolean showAvatar;
 725				if (conversation.getMode() == Conversation.MODE_SINGLE) {
 726					showAvatar = true;
 727					loadAvatar(message,viewHolder.contact_picture,activity.getPixel(32));
 728				} else if (message.getCounterpart() != null ){
 729					showAvatar = true;
 730					loadAvatar(message,viewHolder.contact_picture,activity.getPixel(32));
 731				} else {
 732					showAvatar = false;
 733				}
 734				if (showAvatar) {
 735					viewHolder.contact_picture.setAlpha(0.5f);
 736					viewHolder.contact_picture.setVisibility(View.VISIBLE);
 737				} else {
 738					viewHolder.contact_picture.setVisibility(View.GONE);
 739				}
 740			}
 741			return view;
 742		} else {
 743			loadAvatar(message, viewHolder.contact_picture,activity.getPixel(48));
 744		}
 745
 746		viewHolder.contact_picture
 747			.setOnClickListener(new OnClickListener() {
 748
 749				@Override
 750				public void onClick(View v) {
 751					if (MessageAdapter.this.mOnContactPictureClickedListener != null) {
 752						MessageAdapter.this.mOnContactPictureClickedListener
 753								.onContactPictureClicked(message);
 754					}
 755
 756				}
 757			});
 758		viewHolder.contact_picture
 759			.setOnLongClickListener(new OnLongClickListener() {
 760
 761				@Override
 762				public boolean onLongClick(View v) {
 763					if (MessageAdapter.this.mOnContactPictureLongClickedListener != null) {
 764						MessageAdapter.this.mOnContactPictureLongClickedListener
 765								.onContactPictureLongClicked(message);
 766						return true;
 767					} else {
 768						return false;
 769					}
 770				}
 771			});
 772
 773		final Transferable transferable = message.getTransferable();
 774		if (transferable != null && transferable.getStatus() != Transferable.STATUS_UPLOADING) {
 775			if (transferable.getStatus() == Transferable.STATUS_OFFER) {
 776				displayDownloadableMessage(viewHolder,message,activity.getString(R.string.download_x_file, UIHelper.getFileDescriptionString(activity, message)));
 777			} else if (transferable.getStatus() == Transferable.STATUS_OFFER_CHECK_FILESIZE) {
 778				displayDownloadableMessage(viewHolder, message, activity.getString(R.string.check_x_filesize, UIHelper.getFileDescriptionString(activity, message)));
 779			} else {
 780				displayInfoMessage(viewHolder, UIHelper.getMessagePreview(activity, message).first,darkBackground);
 781			}
 782		} else if (message.getType() == Message.TYPE_IMAGE && message.getEncryption() != Message.ENCRYPTION_PGP && message.getEncryption() != Message.ENCRYPTION_DECRYPTION_FAILED) {
 783			displayImageMessage(viewHolder, message);
 784		} else if (message.getType() == Message.TYPE_FILE && message.getEncryption() != Message.ENCRYPTION_PGP && message.getEncryption() != Message.ENCRYPTION_DECRYPTION_FAILED) {
 785			if (message.getFileParams().width > 0 && message.getFileParams().height > 0) {
 786				displayImageMessage(viewHolder, message);
 787			} else if (message.getFileParams().runtime > 0) {
 788				displayAudioMessage(viewHolder, message, darkBackground);
 789			} else {
 790				displayOpenableMessage(viewHolder, message);
 791			}
 792		} else if (message.getEncryption() == Message.ENCRYPTION_PGP) {
 793			if (account.isPgpDecryptionServiceConnected()) {
 794				if (!account.hasPendingPgpIntent(conversation)) {
 795					displayInfoMessage(viewHolder, activity.getString(R.string.message_decrypting), darkBackground);
 796				} else {
 797					displayInfoMessage(viewHolder, activity.getString(R.string.pgp_message), darkBackground);
 798				}
 799			} else {
 800				displayInfoMessage(viewHolder,activity.getString(R.string.install_openkeychain),darkBackground);
 801				viewHolder.message_box.setOnClickListener(new OnClickListener() {
 802
 803							@Override
 804							public void onClick(View v) {
 805								activity.showInstallPgpDialog();
 806							}
 807						});
 808			}
 809		} else if (message.getEncryption() == Message.ENCRYPTION_DECRYPTION_FAILED) {
 810			displayDecryptionFailed(viewHolder,darkBackground);
 811		} else {
 812			if (message.isGeoUri()) {
 813				displayLocationMessage(viewHolder,message);
 814			} else if (message.bodyIsOnlyEmojis() && message.getType() != Message.TYPE_PRIVATE) {
 815				displayEmojiMessage(viewHolder, message.getBody().trim());
 816			} else if (message.treatAsDownloadable()) {
 817				try {
 818					URL url = new URL(message.getBody());
 819					displayDownloadableMessage(viewHolder,
 820							message,
 821							activity.getString(R.string.check_x_filesize_on_host,
 822									UIHelper.getFileDescriptionString(activity, message),
 823									url.getHost()));
 824				} catch (Exception e) {
 825					displayDownloadableMessage(viewHolder,
 826							message,
 827							activity.getString(R.string.check_x_filesize,
 828									UIHelper.getFileDescriptionString(activity, message)));
 829				}
 830			} else {
 831				displayTextMessage(viewHolder, message, darkBackground, type);
 832			}
 833		}
 834
 835		if (type == RECEIVED) {
 836			if(isInValidSession) {
 837				int bubble;
 838				if (!mUseGreenBackground) {
 839					bubble = activity.getThemeResource(R.attr.message_bubble_received_monochrome, R.drawable.message_bubble_received_white);
 840				} else {
 841					bubble = activity.getThemeResource(R.attr.message_bubble_received_green, R.drawable.message_bubble_received);
 842				}
 843				viewHolder.message_box.setBackgroundResource(bubble);
 844				viewHolder.encryption.setVisibility(View.GONE);
 845			} else {
 846				viewHolder.message_box.setBackgroundResource(R.drawable.message_bubble_received_warning);
 847				viewHolder.encryption.setVisibility(View.VISIBLE);
 848				if (omemoEncryption && !message.isTrusted()) {
 849					viewHolder.encryption.setText(R.string.not_trusted);
 850				} else {
 851					viewHolder.encryption.setText(CryptoHelper.encryptionTypeToText(message.getEncryption()));
 852				}
 853			}
 854		}
 855
 856		displayStatus(viewHolder, message, type, darkBackground);
 857
 858		return view;
 859	}
 860
 861	@Override
 862	public void notifyDataSetChanged() {
 863		listSelectionManager.onBeforeNotifyDataSetChanged();
 864		super.notifyDataSetChanged();
 865		listSelectionManager.onAfterNotifyDataSetChanged();
 866	}
 867
 868	private String transformText(CharSequence text, int start, int end, boolean forCopy) {
 869		SpannableStringBuilder builder = new SpannableStringBuilder(text);
 870		Object copySpan = new Object();
 871		builder.setSpan(copySpan, start, end, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
 872		DividerSpan[] dividerSpans = builder.getSpans(0, builder.length(), DividerSpan.class);
 873		for (DividerSpan dividerSpan : dividerSpans) {
 874			builder.replace(builder.getSpanStart(dividerSpan), builder.getSpanEnd(dividerSpan),
 875					dividerSpan.isLarge() ? "\n\n" : "\n");
 876		}
 877		start = builder.getSpanStart(copySpan);
 878		end = builder.getSpanEnd(copySpan);
 879		if (start == -1 || end == -1) return "";
 880		builder = new SpannableStringBuilder(builder, start, end);
 881		if (forCopy) {
 882			QuoteSpan[] quoteSpans = builder.getSpans(0, builder.length(), QuoteSpan.class);
 883			for (QuoteSpan quoteSpan : quoteSpans) {
 884				builder.insert(builder.getSpanStart(quoteSpan), "> ");
 885			}
 886		}
 887		return builder.toString();
 888	}
 889
 890	@Override
 891	public String transformTextForCopy(CharSequence text, int start, int end) {
 892		if (text instanceof Spanned) {
 893			return transformText(text, start, end, true);
 894		} else {
 895			return text.toString().substring(start, end);
 896		}
 897	}
 898
 899	public FileBackend getFileBackend() {
 900		return activity.xmppConnectionService.getFileBackend();
 901	}
 902
 903	public void stopAudioPlayer() {
 904		audioPlayer.stop();
 905	}
 906
 907	public interface OnQuoteListener {
 908		public void onQuote(String text);
 909	}
 910
 911	private class MessageBodyActionModeCallback implements ActionMode.Callback {
 912
 913		private final TextView textView;
 914
 915		public MessageBodyActionModeCallback(TextView textView) {
 916			this.textView = textView;
 917		}
 918
 919		@Override
 920		public boolean onCreateActionMode(ActionMode mode, Menu menu) {
 921			if (onQuoteListener != null) {
 922				int quoteResId = activity.getThemeResource(R.attr.icon_quote, R.drawable.ic_action_reply);
 923				// 3rd item is placed after "copy" item
 924				menu.add(0, android.R.id.button1, 3, R.string.quote).setIcon(quoteResId)
 925						.setShowAsAction(MenuItem.SHOW_AS_ACTION_ALWAYS | MenuItem.SHOW_AS_ACTION_WITH_TEXT);
 926			}
 927			return false;
 928		}
 929
 930		@Override
 931		public boolean onPrepareActionMode(ActionMode mode, Menu menu) {
 932			return false;
 933		}
 934
 935		@Override
 936		public boolean onActionItemClicked(ActionMode mode, MenuItem item) {
 937			if (item.getItemId() == android.R.id.button1) {
 938				int start = textView.getSelectionStart();
 939				int end = textView.getSelectionEnd();
 940				if (end > start) {
 941					String text = transformText(textView.getText(), start, end, false);
 942					if (onQuoteListener != null) {
 943						onQuoteListener.onQuote(text);
 944					}
 945					mode.finish();
 946				}
 947				return true;
 948			}
 949			return false;
 950		}
 951
 952		@Override
 953		public void onDestroyActionMode(ActionMode mode) {}
 954	}
 955
 956	public void openDownloadable(Message message) {
 957		DownloadableFile file = activity.xmppConnectionService.getFileBackend().getFile(message);
 958		if (!file.exists()) {
 959			Toast.makeText(activity,R.string.file_deleted,Toast.LENGTH_SHORT).show();
 960			return;
 961		}
 962		Intent openIntent = new Intent(Intent.ACTION_VIEW);
 963		String mime = file.getMimeType();
 964		if (mime == null) {
 965			mime = "*/*";
 966		}
 967		Uri uri;
 968		try {
 969			uri = FileBackend.getUriForFile(activity, file);
 970		} catch (SecurityException e) {
 971			Toast.makeText(activity, activity.getString(R.string.no_permission_to_access_x, file.getAbsolutePath()), Toast.LENGTH_SHORT).show();
 972			return;
 973		}
 974		openIntent.setDataAndType(uri, mime);
 975		openIntent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
 976		PackageManager manager = activity.getPackageManager();
 977		List<ResolveInfo> info = manager.queryIntentActivities(openIntent, 0);
 978		if (info.size() == 0) {
 979			openIntent.setDataAndType(uri,"*/*");
 980		}
 981		try {
 982			getContext().startActivity(openIntent);
 983		}  catch (ActivityNotFoundException e) {
 984			Toast.makeText(activity,R.string.no_application_found_to_open_file,Toast.LENGTH_SHORT).show();
 985		}
 986	}
 987
 988	public void showLocation(Message message) {
 989		for(Intent intent : GeoHelper.createGeoIntentsFromMessage(message)) {
 990			if (intent.resolveActivity(getContext().getPackageManager()) != null) {
 991				getContext().startActivity(intent);
 992				return;
 993			}
 994		}
 995		Toast.makeText(activity,R.string.no_application_found_to_display_location,Toast.LENGTH_SHORT).show();
 996	}
 997
 998	public void updatePreferences() {
 999		this.mIndicateReceived = activity.indicateReceived();
1000		this.mUseGreenBackground = activity.useGreenBackground();
1001	}
1002
1003	public TextView getMessageBody(View view) {
1004		final Object tag = view.getTag();
1005		if (tag instanceof ViewHolder) {
1006			final ViewHolder viewHolder = (ViewHolder) tag;
1007			return viewHolder.messageBody;
1008		}
1009		return null;
1010	}
1011
1012	public interface OnContactPictureClicked {
1013		void onContactPictureClicked(Message message);
1014	}
1015
1016	public interface OnContactPictureLongClicked {
1017		void onContactPictureLongClicked(Message message);
1018	}
1019
1020	private static class ViewHolder {
1021
1022		protected LinearLayout message_box;
1023		protected Button download_button;
1024		protected ImageView image;
1025		protected ImageView indicator;
1026		protected ImageView indicatorReceived;
1027		protected TextView time;
1028		protected CopyTextView messageBody;
1029		protected ImageView contact_picture;
1030		protected TextView status_message;
1031		protected TextView encryption;
1032		public Button load_more_messages;
1033		public ImageView edit_indicator;
1034		public RelativeLayout audioPlayer;
1035	}
1036
1037	class BitmapWorkerTask extends AsyncTask<Message, Void, Bitmap> {
1038		private final WeakReference<ImageView> imageViewReference;
1039		private Message message = null;
1040		private final int size;
1041
1042		public BitmapWorkerTask(ImageView imageView, int size) {
1043			imageViewReference = new WeakReference<>(imageView);
1044			this.size = size;
1045		}
1046
1047		@Override
1048		protected Bitmap doInBackground(Message... params) {
1049			return activity.avatarService().get(params[0], size, isCancelled());
1050		}
1051
1052		@Override
1053		protected void onPostExecute(Bitmap bitmap) {
1054			if (bitmap != null && !isCancelled()) {
1055				final ImageView imageView = imageViewReference.get();
1056				if (imageView != null) {
1057					imageView.setImageBitmap(bitmap);
1058					imageView.setBackgroundColor(0x00000000);
1059				}
1060			}
1061		}
1062	}
1063
1064	public void loadAvatar(Message message, ImageView imageView, int size) {
1065		if (cancelPotentialWork(message, imageView)) {
1066			final Bitmap bm = activity.avatarService().get(message, size, true);
1067			if (bm != null) {
1068				cancelPotentialWork(message, imageView);
1069				imageView.setImageBitmap(bm);
1070				imageView.setBackgroundColor(0x00000000);
1071			} else {
1072				imageView.setBackgroundColor(UIHelper.getColorForName(UIHelper.getMessageDisplayName(message)));
1073				imageView.setImageDrawable(null);
1074				final BitmapWorkerTask task = new BitmapWorkerTask(imageView, size);
1075				final AsyncDrawable asyncDrawable = new AsyncDrawable(activity.getResources(), null, task);
1076				imageView.setImageDrawable(asyncDrawable);
1077				try {
1078					task.execute(message);
1079				} catch (final RejectedExecutionException ignored) {
1080				}
1081			}
1082		}
1083	}
1084
1085	public static boolean cancelPotentialWork(Message message, ImageView imageView) {
1086		final BitmapWorkerTask bitmapWorkerTask = getBitmapWorkerTask(imageView);
1087
1088		if (bitmapWorkerTask != null) {
1089			final Message oldMessage = bitmapWorkerTask.message;
1090			if (oldMessage == null || message != oldMessage) {
1091				bitmapWorkerTask.cancel(true);
1092			} else {
1093				return false;
1094			}
1095		}
1096		return true;
1097	}
1098
1099	private static BitmapWorkerTask getBitmapWorkerTask(ImageView imageView) {
1100		if (imageView != null) {
1101			final Drawable drawable = imageView.getDrawable();
1102			if (drawable instanceof AsyncDrawable) {
1103				final AsyncDrawable asyncDrawable = (AsyncDrawable) drawable;
1104				return asyncDrawable.getBitmapWorkerTask();
1105			}
1106		}
1107		return null;
1108	}
1109
1110	static class AsyncDrawable extends BitmapDrawable {
1111		private final WeakReference<BitmapWorkerTask> bitmapWorkerTaskReference;
1112
1113		public AsyncDrawable(Resources res, Bitmap bitmap, BitmapWorkerTask bitmapWorkerTask) {
1114			super(res, bitmap);
1115			bitmapWorkerTaskReference = new WeakReference<>(bitmapWorkerTask);
1116		}
1117
1118		public BitmapWorkerTask getBitmapWorkerTask() {
1119			return bitmapWorkerTaskReference.get();
1120		}
1121	}
1122}