MessageAdapter.java

   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 com.vdurmont.emoji.EmojiManager;
  41
  42import java.lang.ref.WeakReference;
  43import java.net.URL;
  44import java.util.List;
  45import java.util.Locale;
  46import java.util.concurrent.RejectedExecutionException;
  47import java.util.regex.Matcher;
  48import java.util.regex.Pattern;
  49
  50import eu.siacs.conversations.Config;
  51import eu.siacs.conversations.R;
  52import eu.siacs.conversations.crypto.axolotl.FingerprintStatus;
  53import eu.siacs.conversations.entities.Account;
  54import eu.siacs.conversations.entities.Conversation;
  55import eu.siacs.conversations.entities.DownloadableFile;
  56import eu.siacs.conversations.entities.Message;
  57import eu.siacs.conversations.entities.Message.FileParams;
  58import eu.siacs.conversations.entities.Transferable;
  59import eu.siacs.conversations.persistance.FileBackend;
  60import eu.siacs.conversations.services.MessageArchiveService;
  61import eu.siacs.conversations.services.NotificationService;
  62import eu.siacs.conversations.ui.ConversationActivity;
  63import eu.siacs.conversations.ui.service.AudioPlayer;
  64import eu.siacs.conversations.ui.text.DividerSpan;
  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.GeoHelper;
  71import eu.siacs.conversations.utils.Patterns;
  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 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 = params.size / (1024 * 1024)+ " MiB";
 203			} else if (params.size >= 1024) {
 204				filesize = params.size / 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		viewHolder.messageBody.setIncludeFontPadding(false);
 335		Spannable span = new SpannableString(body);
 336		float size = EmojiManager.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		viewHolder.messageBody.setIncludeFontPadding(true);
 416		if (message.getBody() != null) {
 417			final String nick = UIHelper.getMessageDisplayName(message);
 418			SpannableStringBuilder body = message.getMergedBody();
 419			boolean hasMeCommand = message.hasMeCommand();
 420			if (hasMeCommand) {
 421				body = body.replace(0, Message.ME_COMMAND.length(), nick + " ");
 422			}
 423			if (body.length() > Config.MAX_DISPLAY_MESSAGE_CHARS) {
 424				body = new SpannableStringBuilder(body, 0, Config.MAX_DISPLAY_MESSAGE_CHARS);
 425				body.append("\u2026");
 426			}
 427			Message.MergeSeparator[] mergeSeparators = body.getSpans(0, body.length(), Message.MergeSeparator.class);
 428			for (Message.MergeSeparator mergeSeparator : mergeSeparators) {
 429				int start = body.getSpanStart(mergeSeparator);
 430				int end = body.getSpanEnd(mergeSeparator);
 431				body.setSpan(new DividerSpan(true), start, end, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
 432			}
 433			boolean startsWithQuote = handleTextQuotes(body, darkBackground);
 434			if (message.getType() != Message.TYPE_PRIVATE) {
 435				if (hasMeCommand) {
 436					body.setSpan(new StyleSpan(Typeface.BOLD_ITALIC), 0, nick.length(),
 437							Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
 438				}
 439			} else {
 440				String privateMarker;
 441				if (message.getStatus() <= Message.STATUS_RECEIVED) {
 442					privateMarker = activity.getString(R.string.private_message);
 443				} else {
 444					final String to;
 445					if (message.getCounterpart() != null) {
 446						to = message.getCounterpart().getResourcepart();
 447					} else {
 448						to = "";
 449					}
 450					privateMarker = activity.getString(R.string.private_message_to, to);
 451				}
 452				body.insert(0, privateMarker);
 453				int privateMarkerIndex = privateMarker.length();
 454				if (startsWithQuote) {
 455					body.insert(privateMarkerIndex, "\n\n");
 456					body.setSpan(new DividerSpan(false), privateMarkerIndex, privateMarkerIndex + 2,
 457							Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
 458				} else {
 459					body.insert(privateMarkerIndex, " ");
 460				}
 461				body.setSpan(new ForegroundColorSpan(getMessageTextColor(darkBackground, false)),
 462						0, privateMarkerIndex, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
 463				body.setSpan(new StyleSpan(Typeface.BOLD),
 464						0, privateMarkerIndex, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
 465				if (hasMeCommand) {
 466					body.setSpan(new StyleSpan(Typeface.BOLD_ITALIC), privateMarkerIndex + 1,
 467							privateMarkerIndex + 1 + nick.length(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
 468				}
 469			}
 470			if (message.getConversation().getMode() == Conversation.MODE_MULTI && message.getStatus() == Message.STATUS_RECEIVED) {
 471				Pattern pattern = NotificationService.generateNickHighlightPattern(message.getConversation().getMucOptions().getActualNick());
 472				Matcher matcher = pattern.matcher(body);
 473				while(matcher.find()) {
 474					body.setSpan(new StyleSpan(Typeface.BOLD), matcher.start(), matcher.end(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
 475				}
 476			}
 477			Linkify.addLinks(body, XMPP_PATTERN, "xmpp");
 478			Linkify.addLinks(body, Patterns.AUTOLINK_WEB_URL, "http", WEBURL_MATCH_FILTER, WEBURL_TRANSFORM_FILTER);
 479			Linkify.addLinks(body, GeoHelper.GEO_URI, "geo");
 480			viewHolder.messageBody.setAutoLinkMask(0);
 481			viewHolder.messageBody.setText(body);
 482			viewHolder.messageBody.setTextIsSelectable(true);
 483			viewHolder.messageBody.setMovementMethod(ClickableMovementMethod.getInstance());
 484			listSelectionManager.onUpdate(viewHolder.messageBody, message);
 485		} else {
 486			viewHolder.messageBody.setText("");
 487			viewHolder.messageBody.setTextIsSelectable(false);
 488		}
 489		viewHolder.messageBody.setTextColor(this.getMessageTextColor(darkBackground, true));
 490		viewHolder.messageBody.setLinkTextColor(this.getMessageTextColor(darkBackground, true));
 491		viewHolder.messageBody.setHighlightColor(ContextCompat.getColor(activity, darkBackground
 492				? (type == SENT || !mUseGreenBackground ? R.color.black26 : R.color.grey800) : R.color.grey500));
 493		viewHolder.messageBody.setTypeface(null, Typeface.NORMAL);
 494	}
 495
 496	private void displayDownloadableMessage(ViewHolder viewHolder, final Message message, String text) {
 497		viewHolder.image.setVisibility(View.GONE);
 498		viewHolder.messageBody.setVisibility(View.GONE);
 499		viewHolder.audioPlayer.setVisibility(View.GONE);
 500		viewHolder.download_button.setVisibility(View.VISIBLE);
 501		viewHolder.download_button.setText(text);
 502		viewHolder.download_button.setOnClickListener(new OnClickListener() {
 503
 504			@Override
 505			public void onClick(View v) {
 506				activity.startDownloadable(message);
 507			}
 508		});
 509	}
 510
 511	private void displayOpenableMessage(ViewHolder viewHolder,final Message message) {
 512		viewHolder.image.setVisibility(View.GONE);
 513		viewHolder.messageBody.setVisibility(View.GONE);
 514		viewHolder.audioPlayer.setVisibility(View.GONE);
 515		viewHolder.download_button.setVisibility(View.VISIBLE);
 516		viewHolder.download_button.setText(activity.getString(R.string.open_x_file, UIHelper.getFileDescriptionString(activity, message)));
 517		viewHolder.download_button.setOnClickListener(new OnClickListener() {
 518
 519			@Override
 520			public void onClick(View v) {
 521				openDownloadable(message);
 522			}
 523		});
 524	}
 525
 526	private void displayLocationMessage(ViewHolder viewHolder, final Message message) {
 527		viewHolder.image.setVisibility(View.GONE);
 528		viewHolder.messageBody.setVisibility(View.GONE);
 529		viewHolder.audioPlayer.setVisibility(View.GONE);
 530		viewHolder.download_button.setVisibility(View.VISIBLE);
 531		viewHolder.download_button.setText(R.string.show_location);
 532		viewHolder.download_button.setOnClickListener(new OnClickListener() {
 533
 534			@Override
 535			public void onClick(View v) {
 536				showLocation(message);
 537			}
 538		});
 539	}
 540
 541	private void displayAudioMessage(ViewHolder viewHolder, Message message, boolean darkBackground) {
 542		viewHolder.image.setVisibility(View.GONE);
 543		viewHolder.messageBody.setVisibility(View.GONE);
 544		viewHolder.download_button.setVisibility(View.GONE);
 545		final RelativeLayout audioPlayer = viewHolder.audioPlayer;
 546		audioPlayer.setVisibility(View.VISIBLE);
 547		AudioPlayer.ViewHolder.get(audioPlayer).setDarkBackground(darkBackground);
 548		this.audioPlayer.init(audioPlayer, message);
 549	}
 550
 551
 552	private void displayImageMessage(ViewHolder viewHolder, final Message message) {
 553		viewHolder.download_button.setVisibility(View.GONE);
 554		viewHolder.messageBody.setVisibility(View.GONE);
 555		viewHolder.audioPlayer.setVisibility(View.GONE);
 556		viewHolder.image.setVisibility(View.VISIBLE);
 557		FileParams params = message.getFileParams();
 558		double target = metrics.density * 288;
 559		int scaledW;
 560		int scaledH;
 561		if (Math.max(params.height, params.width) * metrics.density <= target) {
 562			scaledW = (int) (params.width * metrics.density);
 563			scaledH = (int) (params.height * metrics.density);
 564		} else if (Math.max(params.height,params.width) <= target) {
 565			scaledW = params.width;
 566			scaledH = params.height;
 567		} else if (params.width <= params.height) {
 568			scaledW = (int) (params.width / ((double) params.height / target));
 569			scaledH = (int) target;
 570		} else {
 571			scaledW = (int) target;
 572			scaledH = (int) (params.height / ((double) params.width / target));
 573		}
 574		LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(scaledW, scaledH);
 575		layoutParams.setMargins(0, (int) (metrics.density * 4), 0, (int) (metrics.density * 4));
 576		viewHolder.image.setLayoutParams(layoutParams);
 577		activity.loadBitmap(message, viewHolder.image);
 578		viewHolder.image.setOnClickListener(new OnClickListener() {
 579
 580			@Override
 581			public void onClick(View v) {
 582				openDownloadable(message);
 583			}
 584		});
 585	}
 586
 587	private void loadMoreMessages(Conversation conversation) {
 588		conversation.setLastClearHistory(0,null);
 589		activity.xmppConnectionService.updateConversation(conversation);
 590		conversation.setHasMessagesLeftOnServer(true);
 591		conversation.setFirstMamReference(null);
 592		long timestamp = conversation.getLastMessageTransmitted().getTimestamp();
 593		if (timestamp == 0) {
 594			timestamp = System.currentTimeMillis();
 595		}
 596		conversation.messagesLoaded.set(true);
 597		MessageArchiveService.Query query = activity.xmppConnectionService.getMessageArchiveService().query(conversation, new MamReference(0), timestamp, false);
 598		if (query != null) {
 599			Toast.makeText(activity, R.string.fetching_history_from_server, Toast.LENGTH_LONG).show();
 600		} else {
 601			Toast.makeText(activity,R.string.not_fetching_history_retention_period, Toast.LENGTH_SHORT).show();
 602		}
 603	}
 604
 605	@Override
 606	public View getView(int position, View view, ViewGroup parent) {
 607		final Message message = getItem(position);
 608		final boolean omemoEncryption = message.getEncryption() == Message.ENCRYPTION_AXOLOTL;
 609		final boolean isInValidSession = message.isValidInSession() && (!omemoEncryption || message.isTrusted());
 610		final Conversation conversation = message.getConversation();
 611		final Account account = conversation.getAccount();
 612		final int type = getItemViewType(position);
 613		ViewHolder viewHolder;
 614		if (view == null) {
 615			viewHolder = new ViewHolder();
 616			switch (type) {
 617				case DATE_SEPARATOR:
 618					view = activity.getLayoutInflater().inflate(R.layout.message_date_bubble, parent, false);
 619					viewHolder.status_message = (TextView) view.findViewById(R.id.message_body);
 620					viewHolder.message_box = (LinearLayout) view.findViewById(R.id.message_box);
 621					break;
 622				case SENT:
 623					view = activity.getLayoutInflater().inflate(
 624							R.layout.message_sent, parent, false);
 625					viewHolder.message_box = (LinearLayout) view
 626						.findViewById(R.id.message_box);
 627					viewHolder.contact_picture = (ImageView) view
 628						.findViewById(R.id.message_photo);
 629					viewHolder.download_button = (Button) view
 630						.findViewById(R.id.download_button);
 631					viewHolder.indicator = (ImageView) view
 632						.findViewById(R.id.security_indicator);
 633					viewHolder.edit_indicator = (ImageView) view.findViewById(R.id.edit_indicator);
 634					viewHolder.image = (ImageView) view
 635						.findViewById(R.id.message_image);
 636					viewHolder.messageBody = (CopyTextView) view
 637						.findViewById(R.id.message_body);
 638					viewHolder.time = (TextView) view
 639						.findViewById(R.id.message_time);
 640					viewHolder.indicatorReceived = (ImageView) view
 641						.findViewById(R.id.indicator_received);
 642					viewHolder.audioPlayer = (RelativeLayout) view.findViewById(R.id.audio_player);
 643					break;
 644				case RECEIVED:
 645					view = activity.getLayoutInflater().inflate(
 646							R.layout.message_received, parent, false);
 647					viewHolder.message_box = (LinearLayout) view
 648						.findViewById(R.id.message_box);
 649					viewHolder.contact_picture = (ImageView) view
 650						.findViewById(R.id.message_photo);
 651					viewHolder.download_button = (Button) view
 652						.findViewById(R.id.download_button);
 653					viewHolder.indicator = (ImageView) view
 654						.findViewById(R.id.security_indicator);
 655					viewHolder.edit_indicator = (ImageView) view.findViewById(R.id.edit_indicator);
 656					viewHolder.image = (ImageView) view
 657						.findViewById(R.id.message_image);
 658					viewHolder.messageBody = (CopyTextView) view
 659						.findViewById(R.id.message_body);
 660					viewHolder.time = (TextView) view
 661						.findViewById(R.id.message_time);
 662					viewHolder.indicatorReceived = (ImageView) view
 663						.findViewById(R.id.indicator_received);
 664					viewHolder.encryption = (TextView) view.findViewById(R.id.message_encryption);
 665					viewHolder.audioPlayer = (RelativeLayout) view.findViewById(R.id.audio_player);
 666					break;
 667				case STATUS:
 668					view = activity.getLayoutInflater().inflate(R.layout.message_status, parent, false);
 669					viewHolder.contact_picture = (ImageView) view.findViewById(R.id.message_photo);
 670					viewHolder.status_message = (TextView) view.findViewById(R.id.status_message);
 671					viewHolder.load_more_messages = (Button) view.findViewById(R.id.load_more_messages);
 672					break;
 673				default:
 674					viewHolder = null;
 675					break;
 676			}
 677			if (viewHolder.messageBody != null) {
 678				listSelectionManager.onCreate(viewHolder.messageBody,
 679						new MessageBodyActionModeCallback(viewHolder.messageBody));
 680				viewHolder.messageBody.setCopyHandler(this);
 681			}
 682			view.setTag(viewHolder);
 683		} else {
 684			viewHolder = (ViewHolder) view.getTag();
 685			if (viewHolder == null) {
 686				return view;
 687			}
 688		}
 689
 690		boolean darkBackground = type == RECEIVED && (!isInValidSession || mUseGreenBackground) || activity.isDarkTheme();
 691
 692		if (type == DATE_SEPARATOR) {
 693			if (UIHelper.today(message.getTimeSent())) {
 694				viewHolder.status_message.setText(R.string.today);
 695			} else if (UIHelper.yesterday(message.getTimeSent())) {
 696				viewHolder.status_message.setText(R.string.yesterday);
 697			} else {
 698				viewHolder.status_message.setText(DateUtils.formatDateTime(activity,message.getTimeSent(),DateUtils.FORMAT_SHOW_DATE | DateUtils.FORMAT_SHOW_YEAR));
 699			}
 700			viewHolder.message_box.setBackgroundResource(activity.isDarkTheme() ? R.drawable.date_bubble_grey : R.drawable.date_bubble_white);
 701			viewHolder.status_message.setTextColor(activity.getSecondaryTextColor());
 702			return view;
 703		} else if (type == STATUS) {
 704			if ("LOAD_MORE".equals(message.getBody())) {
 705				viewHolder.status_message.setVisibility(View.GONE);
 706				viewHolder.contact_picture.setVisibility(View.GONE);
 707				viewHolder.load_more_messages.setVisibility(View.VISIBLE);
 708				viewHolder.load_more_messages.setOnClickListener(new OnClickListener() {
 709					@Override
 710					public void onClick(View v) {
 711						loadMoreMessages(message.getConversation());
 712					}
 713				});
 714			} else {
 715				viewHolder.status_message.setVisibility(View.VISIBLE);
 716				viewHolder.load_more_messages.setVisibility(View.GONE);
 717				viewHolder.status_message.setText(message.getBody());
 718				boolean showAvatar;
 719				if (conversation.getMode() == Conversation.MODE_SINGLE) {
 720					showAvatar = true;
 721					loadAvatar(message,viewHolder.contact_picture,activity.getPixel(32));
 722				} else if (message.getCounterpart() != null ){
 723					showAvatar = true;
 724					loadAvatar(message,viewHolder.contact_picture,activity.getPixel(32));
 725				} else {
 726					showAvatar = false;
 727				}
 728				if (showAvatar) {
 729					viewHolder.contact_picture.setAlpha(0.5f);
 730					viewHolder.contact_picture.setVisibility(View.VISIBLE);
 731				} else {
 732					viewHolder.contact_picture.setVisibility(View.GONE);
 733				}
 734			}
 735			return view;
 736		} else {
 737			loadAvatar(message, viewHolder.contact_picture,activity.getPixel(48));
 738		}
 739
 740		viewHolder.contact_picture
 741			.setOnClickListener(new OnClickListener() {
 742
 743				@Override
 744				public void onClick(View v) {
 745					if (MessageAdapter.this.mOnContactPictureClickedListener != null) {
 746						MessageAdapter.this.mOnContactPictureClickedListener
 747								.onContactPictureClicked(message);
 748					}
 749
 750				}
 751			});
 752		viewHolder.contact_picture
 753			.setOnLongClickListener(new OnLongClickListener() {
 754
 755				@Override
 756				public boolean onLongClick(View v) {
 757					if (MessageAdapter.this.mOnContactPictureLongClickedListener != null) {
 758						MessageAdapter.this.mOnContactPictureLongClickedListener
 759								.onContactPictureLongClicked(message);
 760						return true;
 761					} else {
 762						return false;
 763					}
 764				}
 765			});
 766
 767		final Transferable transferable = message.getTransferable();
 768		if (transferable != null && transferable.getStatus() != Transferable.STATUS_UPLOADING) {
 769			if (transferable.getStatus() == Transferable.STATUS_OFFER) {
 770				displayDownloadableMessage(viewHolder,message,activity.getString(R.string.download_x_file, UIHelper.getFileDescriptionString(activity, message)));
 771			} else if (transferable.getStatus() == Transferable.STATUS_OFFER_CHECK_FILESIZE) {
 772				displayDownloadableMessage(viewHolder, message, activity.getString(R.string.check_x_filesize, UIHelper.getFileDescriptionString(activity, message)));
 773			} else {
 774				displayInfoMessage(viewHolder, UIHelper.getMessagePreview(activity, message).first,darkBackground);
 775			}
 776		} else if (message.getType() == Message.TYPE_IMAGE && message.getEncryption() != Message.ENCRYPTION_PGP && message.getEncryption() != Message.ENCRYPTION_DECRYPTION_FAILED) {
 777			displayImageMessage(viewHolder, message);
 778		} else if (message.getType() == Message.TYPE_FILE && message.getEncryption() != Message.ENCRYPTION_PGP && message.getEncryption() != Message.ENCRYPTION_DECRYPTION_FAILED) {
 779			if (message.getFileParams().width > 0 && message.getFileParams().height > 0) {
 780				displayImageMessage(viewHolder, message);
 781			} else if (message.getFileParams().runtime > 0) {
 782				displayAudioMessage(viewHolder, message, darkBackground);
 783			} else {
 784				displayOpenableMessage(viewHolder, message);
 785			}
 786		} else if (message.getEncryption() == Message.ENCRYPTION_PGP) {
 787			if (account.isPgpDecryptionServiceConnected()) {
 788				if (!account.hasPendingPgpIntent(conversation)) {
 789					displayInfoMessage(viewHolder, activity.getString(R.string.message_decrypting), darkBackground);
 790				} else {
 791					displayInfoMessage(viewHolder, activity.getString(R.string.pgp_message), darkBackground);
 792				}
 793			} else {
 794				displayInfoMessage(viewHolder,activity.getString(R.string.install_openkeychain),darkBackground);
 795				if (viewHolder != null) {
 796					viewHolder.message_box
 797						.setOnClickListener(new OnClickListener() {
 798
 799							@Override
 800							public void onClick(View v) {
 801								activity.showInstallPgpDialog();
 802							}
 803						});
 804				}
 805			}
 806		} else if (message.getEncryption() == Message.ENCRYPTION_DECRYPTION_FAILED) {
 807			displayDecryptionFailed(viewHolder,darkBackground);
 808		} else {
 809			if (message.isGeoUri()) {
 810				displayLocationMessage(viewHolder,message);
 811			} else if (message.bodyIsOnlyEmojis()) {
 812				displayEmojiMessage(viewHolder, message.getBody().replaceAll("\\s",""));
 813			} else if (message.treatAsDownloadable()) {
 814				try {
 815					URL url = new URL(message.getBody());
 816					displayDownloadableMessage(viewHolder,
 817							message,
 818							activity.getString(R.string.check_x_filesize_on_host,
 819									UIHelper.getFileDescriptionString(activity, message),
 820									url.getHost()));
 821				} catch (Exception e) {
 822					displayDownloadableMessage(viewHolder,
 823							message,
 824							activity.getString(R.string.check_x_filesize,
 825									UIHelper.getFileDescriptionString(activity, message)));
 826				}
 827			} else {
 828				displayTextMessage(viewHolder, message, darkBackground, type);
 829			}
 830		}
 831
 832		if (type == RECEIVED) {
 833			if(isInValidSession) {
 834				int bubble;
 835				if (!mUseGreenBackground) {
 836					bubble = activity.getThemeResource(R.attr.message_bubble_received_monochrome, R.drawable.message_bubble_received_white);
 837				} else {
 838					bubble = activity.getThemeResource(R.attr.message_bubble_received_green, R.drawable.message_bubble_received);
 839				}
 840				viewHolder.message_box.setBackgroundResource(bubble);
 841				viewHolder.encryption.setVisibility(View.GONE);
 842			} else {
 843				viewHolder.message_box.setBackgroundResource(R.drawable.message_bubble_received_warning);
 844				viewHolder.encryption.setVisibility(View.VISIBLE);
 845				if (omemoEncryption && !message.isTrusted()) {
 846					viewHolder.encryption.setText(R.string.not_trusted);
 847				} else {
 848					viewHolder.encryption.setText(CryptoHelper.encryptionTypeToText(message.getEncryption()));
 849				}
 850			}
 851		}
 852
 853		displayStatus(viewHolder, message, type, darkBackground);
 854
 855		return view;
 856	}
 857
 858	@Override
 859	public void notifyDataSetChanged() {
 860		listSelectionManager.onBeforeNotifyDataSetChanged();
 861		super.notifyDataSetChanged();
 862		listSelectionManager.onAfterNotifyDataSetChanged();
 863	}
 864
 865	private String transformText(CharSequence text, int start, int end, boolean forCopy) {
 866		SpannableStringBuilder builder = new SpannableStringBuilder(text);
 867		Object copySpan = new Object();
 868		builder.setSpan(copySpan, start, end, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
 869		DividerSpan[] dividerSpans = builder.getSpans(0, builder.length(), DividerSpan.class);
 870		for (DividerSpan dividerSpan : dividerSpans) {
 871			builder.replace(builder.getSpanStart(dividerSpan), builder.getSpanEnd(dividerSpan),
 872					dividerSpan.isLarge() ? "\n\n" : "\n");
 873		}
 874		start = builder.getSpanStart(copySpan);
 875		end = builder.getSpanEnd(copySpan);
 876		if (start == -1 || end == -1) return "";
 877		builder = new SpannableStringBuilder(builder, start, end);
 878		if (forCopy) {
 879			QuoteSpan[] quoteSpans = builder.getSpans(0, builder.length(), QuoteSpan.class);
 880			for (QuoteSpan quoteSpan : quoteSpans) {
 881				builder.insert(builder.getSpanStart(quoteSpan), "> ");
 882			}
 883		}
 884		return builder.toString();
 885	}
 886
 887	@Override
 888	public String transformTextForCopy(CharSequence text, int start, int end) {
 889		if (text instanceof Spanned) {
 890			return transformText(text, start, end, true);
 891		} else {
 892			return text.toString().substring(start, end);
 893		}
 894	}
 895
 896	public FileBackend getFileBackend() {
 897		return activity.xmppConnectionService.getFileBackend();
 898	}
 899
 900	public void stopAudioPlayer() {
 901		audioPlayer.stop();
 902	}
 903
 904	public interface OnQuoteListener {
 905		public void onQuote(String text);
 906	}
 907
 908	private class MessageBodyActionModeCallback implements ActionMode.Callback {
 909
 910		private final TextView textView;
 911
 912		public MessageBodyActionModeCallback(TextView textView) {
 913			this.textView = textView;
 914		}
 915
 916		@Override
 917		public boolean onCreateActionMode(ActionMode mode, Menu menu) {
 918			if (onQuoteListener != null) {
 919				int quoteResId = activity.getThemeResource(R.attr.icon_quote, R.drawable.ic_action_reply);
 920				// 3rd item is placed after "copy" item
 921				menu.add(0, android.R.id.button1, 3, R.string.quote).setIcon(quoteResId)
 922						.setShowAsAction(MenuItem.SHOW_AS_ACTION_ALWAYS | MenuItem.SHOW_AS_ACTION_WITH_TEXT);
 923			}
 924			return false;
 925		}
 926
 927		@Override
 928		public boolean onPrepareActionMode(ActionMode mode, Menu menu) {
 929			return false;
 930		}
 931
 932		@Override
 933		public boolean onActionItemClicked(ActionMode mode, MenuItem item) {
 934			if (item.getItemId() == android.R.id.button1) {
 935				int start = textView.getSelectionStart();
 936				int end = textView.getSelectionEnd();
 937				if (end > start) {
 938					String text = transformText(textView.getText(), start, end, false);
 939					if (onQuoteListener != null) {
 940						onQuoteListener.onQuote(text);
 941					}
 942					mode.finish();
 943				}
 944				return true;
 945			}
 946			return false;
 947		}
 948
 949		@Override
 950		public void onDestroyActionMode(ActionMode mode) {}
 951	}
 952
 953	public void openDownloadable(Message message) {
 954		DownloadableFile file = activity.xmppConnectionService.getFileBackend().getFile(message);
 955		if (!file.exists()) {
 956			Toast.makeText(activity,R.string.file_deleted,Toast.LENGTH_SHORT).show();
 957			return;
 958		}
 959		Intent openIntent = new Intent(Intent.ACTION_VIEW);
 960		String mime = file.getMimeType();
 961		if (mime == null) {
 962			mime = "*/*";
 963		}
 964		Uri uri;
 965		try {
 966			uri = FileBackend.getUriForFile(activity, file);
 967		} catch (SecurityException e) {
 968			Toast.makeText(activity, activity.getString(R.string.no_permission_to_access_x, file.getAbsolutePath()), Toast.LENGTH_SHORT).show();
 969			return;
 970		}
 971		openIntent.setDataAndType(uri, mime);
 972		openIntent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
 973		PackageManager manager = activity.getPackageManager();
 974		List<ResolveInfo> info = manager.queryIntentActivities(openIntent, 0);
 975		if (info.size() == 0) {
 976			openIntent.setDataAndType(uri,"*/*");
 977		}
 978		try {
 979			getContext().startActivity(openIntent);
 980		}  catch (ActivityNotFoundException e) {
 981			Toast.makeText(activity,R.string.no_application_found_to_open_file,Toast.LENGTH_SHORT).show();
 982		}
 983	}
 984
 985	public void showLocation(Message message) {
 986		for(Intent intent : GeoHelper.createGeoIntentsFromMessage(message)) {
 987			if (intent.resolveActivity(getContext().getPackageManager()) != null) {
 988				getContext().startActivity(intent);
 989				return;
 990			}
 991		}
 992		Toast.makeText(activity,R.string.no_application_found_to_display_location,Toast.LENGTH_SHORT).show();
 993	}
 994
 995	public void updatePreferences() {
 996		this.mIndicateReceived = activity.indicateReceived();
 997		this.mUseGreenBackground = activity.useGreenBackground();
 998	}
 999
1000	public TextView getMessageBody(View view) {
1001		final Object tag = view.getTag();
1002		if (tag instanceof ViewHolder) {
1003			final ViewHolder viewHolder = (ViewHolder) tag;
1004			return viewHolder.messageBody;
1005		}
1006		return null;
1007	}
1008
1009	public interface OnContactPictureClicked {
1010		void onContactPictureClicked(Message message);
1011	}
1012
1013	public interface OnContactPictureLongClicked {
1014		void onContactPictureLongClicked(Message message);
1015	}
1016
1017	private static class ViewHolder {
1018
1019		protected LinearLayout message_box;
1020		protected Button download_button;
1021		protected ImageView image;
1022		protected ImageView indicator;
1023		protected ImageView indicatorReceived;
1024		protected TextView time;
1025		protected CopyTextView messageBody;
1026		protected ImageView contact_picture;
1027		protected TextView status_message;
1028		protected TextView encryption;
1029		public Button load_more_messages;
1030		public ImageView edit_indicator;
1031		public RelativeLayout audioPlayer;
1032	}
1033
1034	class BitmapWorkerTask extends AsyncTask<Message, Void, Bitmap> {
1035		private final WeakReference<ImageView> imageViewReference;
1036		private Message message = null;
1037		private final int size;
1038
1039		public BitmapWorkerTask(ImageView imageView, int size) {
1040			imageViewReference = new WeakReference<>(imageView);
1041			this.size = size;
1042		}
1043
1044		@Override
1045		protected Bitmap doInBackground(Message... params) {
1046			return activity.avatarService().get(params[0], size, isCancelled());
1047		}
1048
1049		@Override
1050		protected void onPostExecute(Bitmap bitmap) {
1051			if (bitmap != null && !isCancelled()) {
1052				final ImageView imageView = imageViewReference.get();
1053				if (imageView != null) {
1054					imageView.setImageBitmap(bitmap);
1055					imageView.setBackgroundColor(0x00000000);
1056				}
1057			}
1058		}
1059	}
1060
1061	public void loadAvatar(Message message, ImageView imageView, int size) {
1062		if (cancelPotentialWork(message, imageView)) {
1063			final Bitmap bm = activity.avatarService().get(message, size, true);
1064			if (bm != null) {
1065				cancelPotentialWork(message, imageView);
1066				imageView.setImageBitmap(bm);
1067				imageView.setBackgroundColor(0x00000000);
1068			} else {
1069				imageView.setBackgroundColor(UIHelper.getColorForName(UIHelper.getMessageDisplayName(message)));
1070				imageView.setImageDrawable(null);
1071				final BitmapWorkerTask task = new BitmapWorkerTask(imageView, size);
1072				final AsyncDrawable asyncDrawable = new AsyncDrawable(activity.getResources(), null, task);
1073				imageView.setImageDrawable(asyncDrawable);
1074				try {
1075					task.execute(message);
1076				} catch (final RejectedExecutionException ignored) {
1077				}
1078			}
1079		}
1080	}
1081
1082	public static boolean cancelPotentialWork(Message message, ImageView imageView) {
1083		final BitmapWorkerTask bitmapWorkerTask = getBitmapWorkerTask(imageView);
1084
1085		if (bitmapWorkerTask != null) {
1086			final Message oldMessage = bitmapWorkerTask.message;
1087			if (oldMessage == null || message != oldMessage) {
1088				bitmapWorkerTask.cancel(true);
1089			} else {
1090				return false;
1091			}
1092		}
1093		return true;
1094	}
1095
1096	private static BitmapWorkerTask getBitmapWorkerTask(ImageView imageView) {
1097		if (imageView != null) {
1098			final Drawable drawable = imageView.getDrawable();
1099			if (drawable instanceof AsyncDrawable) {
1100				final AsyncDrawable asyncDrawable = (AsyncDrawable) drawable;
1101				return asyncDrawable.getBitmapWorkerTask();
1102			}
1103		}
1104		return null;
1105	}
1106
1107	static class AsyncDrawable extends BitmapDrawable {
1108		private final WeakReference<BitmapWorkerTask> bitmapWorkerTaskReference;
1109
1110		public AsyncDrawable(Resources res, Bitmap bitmap, BitmapWorkerTask bitmapWorkerTask) {
1111			super(res, bitmap);
1112			bitmapWorkerTaskReference = new WeakReference<>(bitmapWorkerTask);
1113		}
1114
1115		public BitmapWorkerTask getBitmapWorkerTask() {
1116			return bitmapWorkerTaskReference.get();
1117		}
1118	}
1119}