1package eu.siacs.conversations.ui;
2
3import android.annotation.SuppressLint;
4import android.app.Activity;
5import android.app.AlertDialog;
6import android.app.AlertDialog.Builder;
7import android.app.PendingIntent;
8import android.content.ClipData;
9import android.content.ClipboardManager;
10import android.content.ComponentName;
11import android.content.Context;
12import android.content.DialogInterface;
13import android.content.DialogInterface.OnClickListener;
14import android.content.Intent;
15import android.content.IntentSender.SendIntentException;
16import android.content.ServiceConnection;
17import android.content.SharedPreferences;
18import android.content.pm.PackageManager;
19import android.content.pm.ResolveInfo;
20import android.content.res.Resources;
21import android.graphics.Bitmap;
22import android.graphics.Color;
23import android.graphics.Point;
24import android.graphics.drawable.BitmapDrawable;
25import android.graphics.drawable.Drawable;
26import android.net.Uri;
27import android.nfc.NdefMessage;
28import android.nfc.NdefRecord;
29import android.nfc.NfcAdapter;
30import android.nfc.NfcEvent;
31import android.os.AsyncTask;
32import android.os.Bundle;
33import android.os.IBinder;
34import android.preference.PreferenceManager;
35import android.text.InputType;
36import android.util.DisplayMetrics;
37import android.util.Log;
38import android.view.MenuItem;
39import android.view.View;
40import android.view.inputmethod.InputMethodManager;
41import android.widget.EditText;
42import android.widget.ImageView;
43
44import com.google.zxing.BarcodeFormat;
45import com.google.zxing.EncodeHintType;
46import com.google.zxing.WriterException;
47import com.google.zxing.common.BitMatrix;
48import com.google.zxing.qrcode.QRCodeWriter;
49import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;
50
51import java.io.FileNotFoundException;
52import java.lang.ref.WeakReference;
53import java.util.Hashtable;
54import java.util.List;
55import java.util.concurrent.RejectedExecutionException;
56
57import eu.siacs.conversations.Config;
58import eu.siacs.conversations.R;
59import eu.siacs.conversations.entities.Account;
60import eu.siacs.conversations.entities.Contact;
61import eu.siacs.conversations.entities.Conversation;
62import eu.siacs.conversations.entities.Message;
63import eu.siacs.conversations.entities.Presences;
64import eu.siacs.conversations.services.AvatarService;
65import eu.siacs.conversations.services.XmppConnectionService;
66import eu.siacs.conversations.services.XmppConnectionService.XmppConnectionBinder;
67import eu.siacs.conversations.utils.ExceptionHelper;
68import eu.siacs.conversations.xmpp.jid.Jid;
69
70public abstract class XmppActivity extends Activity {
71
72 protected static final int REQUEST_ANNOUNCE_PGP = 0x0101;
73 protected static final int REQUEST_INVITE_TO_CONVERSATION = 0x0102;
74
75 public XmppConnectionService xmppConnectionService;
76 public boolean xmppConnectionServiceBound = false;
77
78 protected int mPrimaryTextColor;
79 protected int mSecondaryTextColor;
80 protected int mSecondaryBackgroundColor;
81 protected int mColorRed;
82 protected int mColorOrange;
83 protected int mColorGreen;
84 protected int mPrimaryColor;
85
86 protected boolean mUseSubject = true;
87
88 private DisplayMetrics metrics;
89
90 protected interface OnValueEdited {
91 public void onValueEdited(String value);
92 }
93
94 public interface OnPresenceSelected {
95 public void onPresenceSelected();
96 }
97
98 protected ServiceConnection mConnection = new ServiceConnection() {
99
100 @Override
101 public void onServiceConnected(ComponentName className, IBinder service) {
102 XmppConnectionBinder binder = (XmppConnectionBinder) service;
103 xmppConnectionService = binder.getService();
104 xmppConnectionServiceBound = true;
105 onBackendConnected();
106 }
107
108 @Override
109 public void onServiceDisconnected(ComponentName arg0) {
110 xmppConnectionServiceBound = false;
111 }
112 };
113
114 @Override
115 protected void onStart() {
116 super.onStart();
117 if (!xmppConnectionServiceBound) {
118 connectToBackend();
119 }
120 }
121
122 public void connectToBackend() {
123 Intent intent = new Intent(this, XmppConnectionService.class);
124 intent.setAction("ui");
125 startService(intent);
126 bindService(intent, mConnection, Context.BIND_AUTO_CREATE);
127 }
128
129 @Override
130 protected void onStop() {
131 super.onStop();
132 if (xmppConnectionServiceBound) {
133 unbindService(mConnection);
134 xmppConnectionServiceBound = false;
135 }
136 }
137
138 protected void hideKeyboard() {
139 InputMethodManager inputManager = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
140
141 View focus = getCurrentFocus();
142
143 if (focus != null) {
144
145 inputManager.hideSoftInputFromWindow(focus.getWindowToken(),
146 InputMethodManager.HIDE_NOT_ALWAYS);
147 }
148 }
149
150 public boolean hasPgp() {
151 return xmppConnectionService.getPgpEngine() != null;
152 }
153
154 public void showInstallPgpDialog() {
155 Builder builder = new AlertDialog.Builder(this);
156 builder.setTitle(getString(R.string.openkeychain_required));
157 builder.setIconAttribute(android.R.attr.alertDialogIcon);
158 builder.setMessage(getText(R.string.openkeychain_required_long));
159 builder.setNegativeButton(getString(R.string.cancel), null);
160 builder.setNeutralButton(getString(R.string.restart),
161 new OnClickListener() {
162
163 @Override
164 public void onClick(DialogInterface dialog, int which) {
165 if (xmppConnectionServiceBound) {
166 unbindService(mConnection);
167 xmppConnectionServiceBound = false;
168 }
169 stopService(new Intent(XmppActivity.this,
170 XmppConnectionService.class));
171 finish();
172 }
173 });
174 builder.setPositiveButton(getString(R.string.install),
175 new OnClickListener() {
176
177 @Override
178 public void onClick(DialogInterface dialog, int which) {
179 Uri uri = Uri
180 .parse("market://details?id=org.sufficientlysecure.keychain");
181 Intent marketIntent = new Intent(Intent.ACTION_VIEW,
182 uri);
183 PackageManager manager = getApplicationContext()
184 .getPackageManager();
185 List<ResolveInfo> infos = manager
186 .queryIntentActivities(marketIntent, 0);
187 if (infos.size() > 0) {
188 startActivity(marketIntent);
189 } else {
190 uri = Uri.parse("http://www.openkeychain.org/");
191 Intent browserIntent = new Intent(
192 Intent.ACTION_VIEW, uri);
193 startActivity(browserIntent);
194 }
195 finish();
196 }
197 });
198 builder.create().show();
199 }
200
201 abstract void onBackendConnected();
202
203 public boolean onOptionsItemSelected(MenuItem item) {
204 switch (item.getItemId()) {
205 case R.id.action_settings:
206 startActivity(new Intent(this, SettingsActivity.class));
207 break;
208 case R.id.action_accounts:
209 startActivity(new Intent(this, ManageAccountActivity.class));
210 break;
211 case android.R.id.home:
212 finish();
213 break;
214 case R.id.action_show_qr_code:
215 showQrCode();
216 break;
217 }
218 return super.onOptionsItemSelected(item);
219 }
220
221 @Override
222 protected void onCreate(Bundle savedInstanceState) {
223 super.onCreate(savedInstanceState);
224 metrics = getResources().getDisplayMetrics();
225 ExceptionHelper.init(getApplicationContext());
226 mPrimaryTextColor = getResources().getColor(R.color.primarytext);
227 mSecondaryTextColor = getResources().getColor(R.color.secondarytext);
228 mColorRed = getResources().getColor(R.color.red);
229 mColorOrange = getResources().getColor(R.color.orange);
230 mColorGreen = getResources().getColor(R.color.green);
231 mPrimaryColor = getResources().getColor(R.color.primary);
232 mSecondaryBackgroundColor = getResources().getColor(
233 R.color.secondarybackground);
234 if (getPreferences().getBoolean("use_larger_font", false)) {
235 setTheme(R.style.ConversationsTheme_LargerText);
236 }
237 mUseSubject = getPreferences().getBoolean("use_subject", true);
238 }
239
240 protected SharedPreferences getPreferences() {
241 return PreferenceManager
242 .getDefaultSharedPreferences(getApplicationContext());
243 }
244
245 public boolean useSubjectToIdentifyConference() {
246 return mUseSubject;
247 }
248
249 public void switchToConversation(Conversation conversation) {
250 switchToConversation(conversation, null, false);
251 }
252
253 public void switchToConversation(Conversation conversation, String text,
254 boolean newTask) {
255 Intent viewConversationIntent = new Intent(this,
256 ConversationActivity.class);
257 viewConversationIntent.setAction(Intent.ACTION_VIEW);
258 viewConversationIntent.putExtra(ConversationActivity.CONVERSATION,
259 conversation.getUuid());
260 if (text != null) {
261 viewConversationIntent.putExtra(ConversationActivity.TEXT, text);
262 }
263 viewConversationIntent.setType(ConversationActivity.VIEW_CONVERSATION);
264 if (newTask) {
265 viewConversationIntent.setFlags(viewConversationIntent.getFlags()
266 | Intent.FLAG_ACTIVITY_NEW_TASK
267 | Intent.FLAG_ACTIVITY_SINGLE_TOP);
268 } else {
269 viewConversationIntent.setFlags(viewConversationIntent.getFlags()
270 | Intent.FLAG_ACTIVITY_CLEAR_TOP);
271 }
272 startActivity(viewConversationIntent);
273 finish();
274 }
275
276 public void switchToContactDetails(Contact contact) {
277 Intent intent = new Intent(this, ContactDetailsActivity.class);
278 intent.setAction(ContactDetailsActivity.ACTION_VIEW_CONTACT);
279 intent.putExtra("account", contact.getAccount().getJid().toString());
280 intent.putExtra("contact", contact.getJid().toString());
281 startActivity(intent);
282 }
283
284 public void switchToAccount(Account account) {
285 Intent intent = new Intent(this, EditAccountActivity.class);
286 intent.putExtra("jid", account.getJid().toString());
287 startActivity(intent);
288 }
289
290 protected void inviteToConversation(Conversation conversation) {
291 Intent intent = new Intent(getApplicationContext(),
292 ChooseContactActivity.class);
293 intent.putExtra("conversation", conversation.getUuid());
294 startActivityForResult(intent, REQUEST_INVITE_TO_CONVERSATION);
295 }
296
297 protected void announcePgp(Account account, final Conversation conversation) {
298 xmppConnectionService.getPgpEngine().generateSignature(account,
299 "online", new UiCallback<Account>() {
300
301 @Override
302 public void userInputRequried(PendingIntent pi,
303 Account account) {
304 try {
305 startIntentSenderForResult(pi.getIntentSender(),
306 REQUEST_ANNOUNCE_PGP, null, 0, 0, 0);
307 } catch (final SendIntentException ignored) {
308 }
309 }
310
311 @Override
312 public void success(Account account) {
313 xmppConnectionService.databaseBackend
314 .updateAccount(account);
315 xmppConnectionService.sendPresencePacket(account,
316 xmppConnectionService.getPresenceGenerator()
317 .sendPresence(account));
318 if (conversation != null) {
319 conversation
320 .setNextEncryption(Message.ENCRYPTION_PGP);
321 xmppConnectionService.databaseBackend
322 .updateConversation(conversation);
323 }
324 }
325
326 @Override
327 public void error(int error, Account account) {
328 displayErrorDialog(error);
329 }
330 });
331 }
332
333 protected void displayErrorDialog(final int errorCode) {
334 runOnUiThread(new Runnable() {
335
336 @Override
337 public void run() {
338 AlertDialog.Builder builder = new AlertDialog.Builder(
339 XmppActivity.this);
340 builder.setIconAttribute(android.R.attr.alertDialogIcon);
341 builder.setTitle(getString(R.string.error));
342 builder.setMessage(errorCode);
343 builder.setNeutralButton(R.string.accept, null);
344 builder.create().show();
345 }
346 });
347
348 }
349
350 protected void showAddToRosterDialog(final Conversation conversation) {
351 final Jid jid = conversation.getContactJid();
352 AlertDialog.Builder builder = new AlertDialog.Builder(this);
353 builder.setTitle(jid.toString());
354 builder.setMessage(getString(R.string.not_in_roster));
355 builder.setNegativeButton(getString(R.string.cancel), null);
356 builder.setPositiveButton(getString(R.string.add_contact),
357 new DialogInterface.OnClickListener() {
358
359 @Override
360 public void onClick(DialogInterface dialog, int which) {
361 final Jid jid = conversation.getContactJid();
362 Account account = conversation.getAccount();
363 Contact contact = account.getRoster().getContact(jid);
364 xmppConnectionService.createContact(contact);
365 switchToContactDetails(contact);
366 }
367 });
368 builder.create().show();
369 }
370
371 private void showAskForPresenceDialog(final Contact contact) {
372 AlertDialog.Builder builder = new AlertDialog.Builder(this);
373 builder.setTitle(contact.getJid().toString());
374 builder.setMessage(R.string.request_presence_updates);
375 builder.setNegativeButton(R.string.cancel, null);
376 builder.setPositiveButton(R.string.request_now,
377 new DialogInterface.OnClickListener() {
378
379 @Override
380 public void onClick(DialogInterface dialog, int which) {
381 if (xmppConnectionServiceBound) {
382 xmppConnectionService.sendPresencePacket(contact
383 .getAccount(), xmppConnectionService
384 .getPresenceGenerator()
385 .requestPresenceUpdatesFrom(contact));
386 }
387 }
388 });
389 builder.create().show();
390 }
391
392 private void warnMutalPresenceSubscription(final Conversation conversation,
393 final OnPresenceSelected listener) {
394 AlertDialog.Builder builder = new AlertDialog.Builder(this);
395 builder.setTitle(conversation.getContact().getJid().toString());
396 builder.setMessage(R.string.without_mutual_presence_updates);
397 builder.setNegativeButton(R.string.cancel, null);
398 builder.setPositiveButton(R.string.ignore, new OnClickListener() {
399
400 @Override
401 public void onClick(DialogInterface dialog, int which) {
402 conversation.setNextPresence(null);
403 if (listener != null) {
404 listener.onPresenceSelected();
405 }
406 }
407 });
408 builder.create().show();
409 }
410
411 protected void quickEdit(String previousValue, OnValueEdited callback) {
412 quickEdit(previousValue, callback, false);
413 }
414
415 protected void quickPasswordEdit(String previousValue,
416 OnValueEdited callback) {
417 quickEdit(previousValue, callback, true);
418 }
419
420 @SuppressLint("InflateParams")
421 private void quickEdit(final String previousValue,
422 final OnValueEdited callback, boolean password) {
423 AlertDialog.Builder builder = new AlertDialog.Builder(this);
424 View view = getLayoutInflater().inflate(R.layout.quickedit, null);
425 final EditText editor = (EditText) view.findViewById(R.id.editor);
426 OnClickListener mClickListener = new OnClickListener() {
427
428 @Override
429 public void onClick(DialogInterface dialog, int which) {
430 String value = editor.getText().toString();
431 if (!previousValue.equals(value) && value.trim().length() > 0) {
432 callback.onValueEdited(value);
433 }
434 }
435 };
436 if (password) {
437 editor.setInputType(InputType.TYPE_CLASS_TEXT
438 | InputType.TYPE_TEXT_VARIATION_PASSWORD);
439 editor.setHint(R.string.password);
440 builder.setPositiveButton(R.string.accept, mClickListener);
441 } else {
442 builder.setPositiveButton(R.string.edit, mClickListener);
443 }
444 editor.requestFocus();
445 editor.setText(previousValue);
446 builder.setView(view);
447 builder.setNegativeButton(R.string.cancel, null);
448 builder.create().show();
449 }
450
451 public void selectPresence(final Conversation conversation,
452 final OnPresenceSelected listener) {
453 Contact contact = conversation.getContact();
454 if (!contact.showInRoster()) {
455 showAddToRosterDialog(conversation);
456 } else {
457 Presences presences = contact.getPresences();
458 if (presences.size() == 0) {
459 if (!contact.getOption(Contact.Options.TO)
460 && !contact.getOption(Contact.Options.ASKING)
461 && contact.getAccount().getStatus() == Account.STATUS_ONLINE) {
462 showAskForPresenceDialog(contact);
463 } else if (!contact.getOption(Contact.Options.TO)
464 || !contact.getOption(Contact.Options.FROM)) {
465 warnMutalPresenceSubscription(conversation, listener);
466 } else {
467 conversation.setNextPresence(null);
468 listener.onPresenceSelected();
469 }
470 } else if (presences.size() == 1) {
471 String presence = presences.asStringArray()[0];
472 conversation.setNextPresence(presence);
473 listener.onPresenceSelected();
474 } else {
475 final StringBuilder presence = new StringBuilder();
476 AlertDialog.Builder builder = new AlertDialog.Builder(this);
477 builder.setTitle(getString(R.string.choose_presence));
478 final String[] presencesArray = presences.asStringArray();
479 int preselectedPresence = 0;
480 for (int i = 0; i < presencesArray.length; ++i) {
481 if (presencesArray[i].equals(contact.lastseen.presence)) {
482 preselectedPresence = i;
483 break;
484 }
485 }
486 presence.append(presencesArray[preselectedPresence]);
487 builder.setSingleChoiceItems(presencesArray,
488 preselectedPresence,
489 new DialogInterface.OnClickListener() {
490
491 @Override
492 public void onClick(DialogInterface dialog,
493 int which) {
494 presence.delete(0, presence.length());
495 presence.append(presencesArray[which]);
496 }
497 });
498 builder.setNegativeButton(R.string.cancel, null);
499 builder.setPositiveButton(R.string.ok, new OnClickListener() {
500
501 @Override
502 public void onClick(DialogInterface dialog, int which) {
503 conversation.setNextPresence(presence.toString());
504 listener.onPresenceSelected();
505 }
506 });
507 builder.create().show();
508 }
509 }
510 }
511
512 protected void onActivityResult(int requestCode, int resultCode,
513 final Intent data) {
514 super.onActivityResult(requestCode, resultCode, data);
515 if (requestCode == REQUEST_INVITE_TO_CONVERSATION
516 && resultCode == RESULT_OK) {
517 String contactJid = data.getStringExtra("contact");
518 String conversationUuid = data.getStringExtra("conversation");
519 Conversation conversation = xmppConnectionService
520 .findConversationByUuid(conversationUuid);
521 if (conversation.getMode() == Conversation.MODE_MULTI) {
522 xmppConnectionService.invite(conversation, contactJid);
523 }
524 Log.d(Config.LOGTAG, "inviting " + contactJid + " to "
525 + conversation.getName());
526 }
527 }
528
529 public int getSecondaryTextColor() {
530 return this.mSecondaryTextColor;
531 }
532
533 public int getPrimaryTextColor() {
534 return this.mPrimaryTextColor;
535 }
536
537 public int getWarningTextColor() {
538 return this.mColorRed;
539 }
540
541 public int getPrimaryColor() {
542 return this.mPrimaryColor;
543 }
544
545 public int getSecondaryBackgroundColor() {
546 return this.mSecondaryBackgroundColor;
547 }
548
549 public int getPixel(int dp) {
550 DisplayMetrics metrics = getResources().getDisplayMetrics();
551 return ((int) (dp * metrics.density));
552 }
553
554 public boolean copyTextToClipboard(String text, int labelResId) {
555 ClipboardManager mClipBoardManager = (ClipboardManager) getSystemService(CLIPBOARD_SERVICE);
556 String label = getResources().getString(labelResId);
557 if (mClipBoardManager != null) {
558 ClipData mClipData = ClipData.newPlainText(label, text);
559 mClipBoardManager.setPrimaryClip(mClipData);
560 return true;
561 }
562 return false;
563 }
564
565 protected void registerNdefPushMessageCallback() {
566 NfcAdapter nfcAdapter = NfcAdapter.getDefaultAdapter(this);
567 if (nfcAdapter != null && nfcAdapter.isEnabled()) {
568 nfcAdapter.setNdefPushMessageCallback(new NfcAdapter.CreateNdefMessageCallback() {
569 @Override
570 public NdefMessage createNdefMessage(NfcEvent nfcEvent) {
571 return new NdefMessage(new NdefRecord[]{
572 NdefRecord.createUri(getShareableUri()),
573 NdefRecord.createApplicationRecord("eu.siacs.conversations")
574 });
575 }
576 }, this);
577 }
578 }
579
580 protected void unregisterNdefPushMessageCallback() {
581 NfcAdapter nfcAdapter = NfcAdapter.getDefaultAdapter(this);
582 if (nfcAdapter != null && nfcAdapter.isEnabled()) {
583 nfcAdapter.setNdefPushMessageCallback(null,this);
584 }
585 }
586
587 protected String getShareableUri() {
588 return null;
589 }
590
591 @Override
592 public void onResume() {
593 super.onResume();
594 if (this.getShareableUri()!=null) {
595 this.registerNdefPushMessageCallback();
596 }
597 }
598
599 @Override
600 public void onPause() {
601 super.onPause();
602 this.unregisterNdefPushMessageCallback();
603 }
604
605 protected void showQrCode() {
606 String uri = getShareableUri();
607 if (uri!=null) {
608 Point size = new Point();
609 getWindowManager().getDefaultDisplay().getSize(size);
610 final int width = (size.x < size.y ? size.x : size.y);
611 Bitmap bitmap = createQrCodeBitmap(uri, width);
612 ImageView view = new ImageView(this);
613 view.setImageBitmap(bitmap);
614 AlertDialog.Builder builder = new AlertDialog.Builder(this);
615 builder.setView(view);
616 builder.create().show();
617 }
618 }
619
620 protected Bitmap createQrCodeBitmap(String input, int size) {
621 try {
622 final QRCodeWriter QR_CODE_WRITER = new QRCodeWriter();
623 final Hashtable<EncodeHintType, Object> hints = new Hashtable<>();
624 hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.M);
625 final BitMatrix result = QR_CODE_WRITER.encode(input, BarcodeFormat.QR_CODE, size, size, hints);
626 final int width = result.getWidth();
627 final int height = result.getHeight();
628 final int[] pixels = new int[width * height];
629 for (int y = 0; y < height; y++) {
630 final int offset = y * width;
631 for (int x = 0; x < width; x++) {
632 pixels[offset + x] = result.get(x, y) ? Color.BLACK : Color.TRANSPARENT;
633 }
634 }
635 final Bitmap bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
636 bitmap.setPixels(pixels, 0, width, 0, 0, width, height);
637 return bitmap;
638 } catch (final WriterException e) {
639 return null;
640 }
641 }
642
643 public AvatarService avatarService() {
644 return xmppConnectionService.getAvatarService();
645 }
646
647 class BitmapWorkerTask extends AsyncTask<Message, Void, Bitmap> {
648 private final WeakReference<ImageView> imageViewReference;
649 private Message message = null;
650
651 public BitmapWorkerTask(ImageView imageView) {
652 imageViewReference = new WeakReference<>(imageView);
653 }
654
655 @Override
656 protected Bitmap doInBackground(Message... params) {
657 message = params[0];
658 try {
659 return xmppConnectionService.getFileBackend().getThumbnail(
660 message, (int) (metrics.density * 288), false);
661 } catch (FileNotFoundException e) {
662 return null;
663 }
664 }
665
666 @Override
667 protected void onPostExecute(Bitmap bitmap) {
668 if (bitmap != null) {
669 final ImageView imageView = imageViewReference.get();
670 if (imageView != null) {
671 imageView.setImageBitmap(bitmap);
672 imageView.setBackgroundColor(0x00000000);
673 }
674 }
675 }
676 }
677
678 public void loadBitmap(Message message, ImageView imageView) {
679 Bitmap bm;
680 try {
681 bm = xmppConnectionService.getFileBackend().getThumbnail(message,
682 (int) (metrics.density * 288), true);
683 } catch (FileNotFoundException e) {
684 bm = null;
685 }
686 if (bm != null) {
687 imageView.setImageBitmap(bm);
688 imageView.setBackgroundColor(0x00000000);
689 } else {
690 if (cancelPotentialWork(message, imageView)) {
691 imageView.setBackgroundColor(0xff333333);
692 final BitmapWorkerTask task = new BitmapWorkerTask(imageView);
693 final AsyncDrawable asyncDrawable = new AsyncDrawable(
694 getResources(), null, task);
695 imageView.setImageDrawable(asyncDrawable);
696 try {
697 task.execute(message);
698 } catch (final RejectedExecutionException ignored) {
699 }
700 }
701 }
702 }
703
704 public static boolean cancelPotentialWork(Message message,
705 ImageView imageView) {
706 final BitmapWorkerTask bitmapWorkerTask = getBitmapWorkerTask(imageView);
707
708 if (bitmapWorkerTask != null) {
709 final Message oldMessage = bitmapWorkerTask.message;
710 if (oldMessage == null || message != oldMessage) {
711 bitmapWorkerTask.cancel(true);
712 } else {
713 return false;
714 }
715 }
716 return true;
717 }
718
719 private static BitmapWorkerTask getBitmapWorkerTask(ImageView imageView) {
720 if (imageView != null) {
721 final Drawable drawable = imageView.getDrawable();
722 if (drawable instanceof AsyncDrawable) {
723 final AsyncDrawable asyncDrawable = (AsyncDrawable) drawable;
724 return asyncDrawable.getBitmapWorkerTask();
725 }
726 }
727 return null;
728 }
729
730 static class AsyncDrawable extends BitmapDrawable {
731 private final WeakReference<BitmapWorkerTask> bitmapWorkerTaskReference;
732
733 public AsyncDrawable(Resources res, Bitmap bitmap,
734 BitmapWorkerTask bitmapWorkerTask) {
735 super(res, bitmap);
736 bitmapWorkerTaskReference = new WeakReference<>(
737 bitmapWorkerTask);
738 }
739
740 public BitmapWorkerTask getBitmapWorkerTask() {
741 return bitmapWorkerTaskReference.get();
742 }
743 }
744}