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