WidgetService.java revision 259df5b9e11908c8ef7c91483924891dd96b3c27
1/* 2 * Copyright (C) 2012 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16package com.android.mail.widget; 17 18import android.app.PendingIntent; 19import android.appwidget.AppWidgetManager; 20import android.content.Context; 21import android.content.CursorLoader; 22import android.content.Intent; 23import android.content.Loader; 24import android.content.Loader.OnLoadCompleteListener; 25import android.content.res.Resources; 26import android.database.Cursor; 27import android.net.Uri; 28import android.os.Looper; 29import android.support.v4.app.TaskStackBuilder; 30import android.text.SpannableString; 31import android.text.SpannableStringBuilder; 32import android.text.TextUtils; 33import android.text.format.DateUtils; 34import android.text.style.CharacterStyle; 35import android.text.style.TextAppearanceSpan; 36import android.view.View; 37import android.widget.RemoteViews; 38import android.widget.RemoteViewsService; 39 40import com.android.mail.R; 41import com.android.mail.browse.SendersView; 42import com.android.mail.compose.ComposeActivity; 43import com.android.mail.preferences.MailPrefs; 44import com.android.mail.providers.Account; 45import com.android.mail.providers.Conversation; 46import com.android.mail.providers.Folder; 47import com.android.mail.providers.UIProvider; 48import com.android.mail.providers.UIProvider.ConversationListQueryParameters; 49import com.android.mail.providers.UIProvider.FolderType; 50import com.android.mail.utils.AccountUtils; 51import com.android.mail.utils.FolderUri; 52import com.android.mail.utils.DelayedTaskHandler; 53import com.android.mail.utils.LogTag; 54import com.android.mail.utils.LogUtils; 55import com.android.mail.utils.Utils; 56 57import java.util.ArrayList; 58 59public class WidgetService extends RemoteViewsService { 60 /** 61 * Lock to avoid race condition between widgets. 62 */ 63 private static Object sWidgetLock = new Object(); 64 65 private static final String LOG_TAG = LogTag.getLogTag(); 66 67 @Override 68 public RemoteViewsFactory onGetViewFactory(Intent intent) { 69 return new MailFactory(getApplicationContext(), intent, this); 70 } 71 72 protected void configureValidAccountWidget(Context context, RemoteViews remoteViews, 73 int appWidgetId, Account account, final int folderType, final Uri folderUri, 74 final Uri folderConversationListUri, String folderName) { 75 configureValidAccountWidget(context, remoteViews, appWidgetId, account, folderType, 76 folderUri, folderConversationListUri, folderName, WidgetService.class); 77 } 78 79 /** 80 * Modifies the remoteView for the given account and folder. 81 */ 82 public static void configureValidAccountWidget(Context context, RemoteViews remoteViews, 83 int appWidgetId, Account account, final int folderType, final Uri folderUri, 84 final Uri folderConversationListUri, String folderDisplayName, Class<?> widgetService) { 85 remoteViews.setViewVisibility(R.id.widget_folder, View.VISIBLE); 86 87 // If the folder or account name are empty, we don't want to overwrite the valid data that 88 // had been saved previously. Since the launcher will save the state of the remote views 89 // we should rely on the fact that valid data has been saved. But we should still log this, 90 // as it shouldn't happen 91 if (TextUtils.isEmpty(folderDisplayName) || TextUtils.isEmpty(account.name)) { 92 LogUtils.e(LOG_TAG, new Error(), 93 "Empty folder or account name. account: %s, folder: %s", 94 account.name, folderDisplayName); 95 } 96 if (!TextUtils.isEmpty(folderDisplayName)) { 97 remoteViews.setTextViewText(R.id.widget_folder, folderDisplayName); 98 } 99 remoteViews.setViewVisibility(R.id.widget_account, View.VISIBLE); 100 101 if (!TextUtils.isEmpty(account.name)) { 102 remoteViews.setTextViewText(R.id.widget_account, account.name); 103 } 104 remoteViews.setViewVisibility(R.id.widget_unread_count, View.GONE); 105 remoteViews.setViewVisibility(R.id.widget_compose, View.VISIBLE); 106 remoteViews.setViewVisibility(R.id.conversation_list, View.VISIBLE); 107 remoteViews.setViewVisibility(R.id.empty_conversation_list, View.VISIBLE); 108 remoteViews.setViewVisibility(R.id.widget_folder_not_synced, View.GONE); 109 remoteViews.setViewVisibility(R.id.widget_configuration, View.GONE); 110 remoteViews.setEmptyView(R.id.conversation_list, R.id.empty_conversation_list); 111 112 WidgetService.configureValidWidgetIntents(context, remoteViews, appWidgetId, account, 113 folderType, folderUri, folderConversationListUri, folderDisplayName, widgetService); 114 } 115 116 public static void configureValidWidgetIntents(Context context, RemoteViews remoteViews, 117 int appWidgetId, Account account, final int folderType, final Uri folderUri, 118 final Uri folderConversationListUri, final String folderDisplayName, 119 Class<?> serviceClass) { 120 remoteViews.setViewVisibility(R.id.widget_configuration, View.GONE); 121 122 123 // Launch an intent to avoid ANRs 124 final Intent intent = new Intent(context, serviceClass); 125 intent.putExtra(AppWidgetManager.EXTRA_APPWIDGET_ID, appWidgetId); 126 intent.putExtra(Utils.EXTRA_ACCOUNT, account.serialize()); 127 intent.putExtra(BaseWidgetProvider.EXTRA_FOLDER_TYPE, folderType); 128 intent.putExtra(BaseWidgetProvider.EXTRA_FOLDER_URI, folderUri); 129 intent.putExtra(BaseWidgetProvider.EXTRA_FOLDER_CONVERSATION_LIST_URI, 130 folderConversationListUri); 131 intent.putExtra(BaseWidgetProvider.EXTRA_FOLDER_DISPLAY_NAME, folderDisplayName); 132 intent.setData(Uri.parse(intent.toUri(Intent.URI_INTENT_SCHEME))); 133 remoteViews.setRemoteAdapter(R.id.conversation_list, intent); 134 // Open mail app when click on header 135 final Intent mailIntent = Utils.createViewFolderIntent(context, folderUri, account); 136 PendingIntent clickIntent = PendingIntent.getActivity(context, 0, mailIntent, 137 PendingIntent.FLAG_UPDATE_CURRENT); 138 remoteViews.setOnClickPendingIntent(R.id.widget_header, clickIntent); 139 140 // On click intent for Compose 141 final Intent composeIntent = new Intent(); 142 composeIntent.setAction(Intent.ACTION_SEND); 143 composeIntent.putExtra(Utils.EXTRA_ACCOUNT, account.serialize()); 144 composeIntent.setData(account.composeIntentUri); 145 composeIntent.putExtra(ComposeActivity.EXTRA_FROM_EMAIL_TASK, true); 146 if (account.composeIntentUri != null) { 147 composeIntent.putExtra(Utils.EXTRA_COMPOSE_URI, account.composeIntentUri); 148 } 149 150 // Build a task stack that forces the conversation list on the stack before the compose 151 // activity. 152 final TaskStackBuilder taskStackBuilder = TaskStackBuilder.create(context); 153 clickIntent = taskStackBuilder.addNextIntent(mailIntent) 154 .addNextIntent(composeIntent) 155 .getPendingIntent(0, PendingIntent.FLAG_UPDATE_CURRENT); 156 remoteViews.setOnClickPendingIntent(R.id.widget_compose, clickIntent); 157 158 // On click intent for Conversation 159 final Intent conversationIntent = new Intent(); 160 conversationIntent.setAction(Intent.ACTION_VIEW); 161 clickIntent = PendingIntent.getActivity(context, 0, conversationIntent, 162 PendingIntent.FLAG_UPDATE_CURRENT); 163 remoteViews.setPendingIntentTemplate(R.id.conversation_list, clickIntent); 164 } 165 166 /** 167 * Persists the information about the specified widget. 168 */ 169 public static void saveWidgetInformation(Context context, int appWidgetId, Account account, 170 final String folderUri) { 171 MailPrefs.get(context).configureWidget(appWidgetId, account, folderUri); 172 } 173 174 /** 175 * Returns true if this widget id has been configured and saved. 176 */ 177 public boolean isWidgetConfigured(Context context, int appWidgetId, Account account) { 178 return isAccountValid(context, account) && 179 MailPrefs.get(context).isWidgetConfigured(appWidgetId); 180 } 181 182 protected boolean isAccountValid(Context context, Account account) { 183 if (account != null) { 184 Account[] accounts = AccountUtils.getSyncingAccounts(context); 185 for (Account existing : accounts) { 186 if (existing != null && account.uri.equals(existing.uri)) { 187 return true; 188 } 189 } 190 } 191 return false; 192 } 193 194 /** 195 * Remote Views Factory for Mail Widget. 196 */ 197 protected static class MailFactory 198 implements RemoteViewsService.RemoteViewsFactory, OnLoadCompleteListener<Cursor> { 199 private static final int MAX_CONVERSATIONS_COUNT = 25; 200 private static final int MAX_SENDERS_LENGTH = 25; 201 202 private static final int FOLDER_LOADER_ID = 0; 203 private static final int CONVERSATION_CURSOR_LOADER_ID = 1; 204 205 private final Context mContext; 206 private final int mAppWidgetId; 207 private final Account mAccount; 208 private final int mFolderType; 209 private final Uri mFolderUri; 210 private final Uri mFolderConversationListUri; 211 private final String mFolderDisplayName; 212 private final WidgetConversationViewBuilder mWidgetConversationViewBuilder; 213 private CursorLoader mConversationCursorLoader; 214 private Cursor mConversationCursor; 215 private CursorLoader mFolderLoader; 216 private FolderUpdateHandler mFolderUpdateHandler; 217 private int mFolderCount; 218 private boolean mShouldShowViewMore; 219 private boolean mFolderInformationShown = false; 220 private final WidgetService mService; 221 private String mSendersSplitToken; 222 private String mElidedPaddingToken; 223 private TextAppearanceSpan mUnreadStyle; 224 private TextAppearanceSpan mReadStyle; 225 226 public MailFactory(Context context, Intent intent, WidgetService service) { 227 mContext = context; 228 mAppWidgetId = intent.getIntExtra( 229 AppWidgetManager.EXTRA_APPWIDGET_ID, AppWidgetManager.INVALID_APPWIDGET_ID); 230 mAccount = Account.newinstance(intent.getStringExtra(Utils.EXTRA_ACCOUNT)); 231 mFolderType = intent.getIntExtra(WidgetProvider.EXTRA_FOLDER_TYPE, FolderType.DEFAULT); 232 mFolderDisplayName = intent.getStringExtra(WidgetProvider.EXTRA_FOLDER_DISPLAY_NAME); 233 234 Uri folderUri = intent.getParcelableExtra(WidgetProvider.EXTRA_FOLDER_URI); 235 Uri folderConversationListUri = 236 intent.getParcelableExtra(WidgetProvider.EXTRA_FOLDER_CONVERSATION_LIST_URI); 237 if (folderUri != null && folderConversationListUri != null) { 238 mFolderUri = folderUri; 239 mFolderConversationListUri = folderConversationListUri; 240 } else { 241 // This is a old intent created in version UR8 (or earlier). 242 String folderString = intent.getStringExtra(Utils.EXTRA_FOLDER); 243 Folder folder = Folder.fromString(folderString); 244 if (folder != null) { 245 mFolderUri = folder.folderUri.fullUri; 246 mFolderConversationListUri = folder.conversationListUri; 247 } else { 248 mFolderUri = Uri.EMPTY; 249 mFolderConversationListUri = Uri.EMPTY; 250 // this will mark the widget as unconfigured 251 BaseWidgetProvider.updateWidget(mContext, mAppWidgetId, mAccount, mFolderType, 252 mFolderUri, mFolderConversationListUri, mFolderDisplayName); 253 } 254 } 255 256 mWidgetConversationViewBuilder = new WidgetConversationViewBuilder(context); 257 mService = service; 258 } 259 260 @Override 261 public void onCreate() { 262 // Save the map between widgetId and account to preference 263 saveWidgetInformation(mContext, mAppWidgetId, mAccount, mFolderUri.toString()); 264 265 // If the account of this widget has been removed, we want to update the widget to 266 // "Tap to configure" mode. 267 if (!mService.isWidgetConfigured(mContext, mAppWidgetId, mAccount)) { 268 BaseWidgetProvider.updateWidget(mContext, mAppWidgetId, mAccount, mFolderType, 269 mFolderUri, mFolderConversationListUri, mFolderDisplayName); 270 } 271 272 mFolderInformationShown = false; 273 274 // We want to limit the query result to 25 and don't want these queries to cause network 275 // traffic 276 // We also want this cursor to receive notifications on all changes. Any change that 277 // the user made locally, the default policy of the UI provider is to not send 278 // notifications for. But in this case, since the widget is not using the 279 // ConversationCursor instance that the UI is using, the widget would not be updated. 280 final Uri.Builder builder = mFolderConversationListUri.buildUpon(); 281 final String maxConversations = Integer.toString(MAX_CONVERSATIONS_COUNT); 282 final Uri widgetConversationQueryUri = builder 283 .appendQueryParameter(ConversationListQueryParameters.LIMIT, maxConversations) 284 .appendQueryParameter(ConversationListQueryParameters.USE_NETWORK, 285 Boolean.FALSE.toString()) 286 .appendQueryParameter(ConversationListQueryParameters.ALL_NOTIFICATIONS, 287 Boolean.TRUE.toString()).build(); 288 289 final Resources res = mContext.getResources(); 290 mConversationCursorLoader = new CursorLoader(mContext, widgetConversationQueryUri, 291 UIProvider.CONVERSATION_PROJECTION, null, null, null); 292 mConversationCursorLoader.registerListener(CONVERSATION_CURSOR_LOADER_ID, this); 293 mConversationCursorLoader.setUpdateThrottle( 294 res.getInteger(R.integer.widget_refresh_delay_ms)); 295 mConversationCursorLoader.startLoading(); 296 mSendersSplitToken = res.getString(R.string.senders_split_token); 297 mElidedPaddingToken = res.getString(R.string.elided_padding_token); 298 mFolderLoader = new CursorLoader(mContext, mFolderUri, UIProvider.FOLDERS_PROJECTION, 299 null, null, null); 300 mFolderLoader.registerListener(FOLDER_LOADER_ID, this); 301 mFolderUpdateHandler = new FolderUpdateHandler( 302 res.getInteger(R.integer.widget_folder_refresh_delay_ms)); 303 mFolderUpdateHandler.scheduleTask(); 304 305 } 306 307 @Override 308 public void onDestroy() { 309 synchronized (sWidgetLock) { 310 if (mConversationCursorLoader != null) { 311 mConversationCursorLoader.reset(); 312 mConversationCursorLoader.unregisterListener(this); 313 mConversationCursorLoader = null; 314 } 315 316 // The Loader should close the cursor, so just unset the reference 317 // to it here. 318 mConversationCursor = null; 319 } 320 321 if (mFolderLoader != null) { 322 mFolderLoader.reset(); 323 mFolderLoader.unregisterListener(this); 324 mFolderLoader = null; 325 } 326 } 327 328 @Override 329 public void onDataSetChanged() { 330 // We are not using this as signal to requery the cursor. The query will be started 331 // in the following ways: 332 // 1) The Service is started and the loader is started in onCreate() 333 // This will happen when the service is not running, and 334 // AppWidgetManager#notifyAppWidgetViewDataChanged() is called 335 // 2) The service is running, with a previously created loader. The loader is watching 336 // for updates from the existing cursor. If one is seen, the loader will load a new 337 // cursor in the background. 338 mFolderUpdateHandler.scheduleTask(); 339 } 340 341 /** 342 * Returns the number of items should be shown in the widget list. This method also updates 343 * the boolean that indicates whether the "show more" item should be shown. 344 * @return the number of items to be displayed in the list. 345 */ 346 @Override 347 public int getCount() { 348 synchronized (sWidgetLock) { 349 final int count = getConversationCount(); 350 final int cursorCount = mConversationCursor != null ? 351 mConversationCursor.getCount() : 0; 352 mShouldShowViewMore = count < cursorCount || count < mFolderCount; 353 return count + (mShouldShowViewMore ? 1 : 0); 354 } 355 } 356 357 /** 358 * Returns the number of conversations that should be shown in the widget. This method 359 * doesn't update the boolean that indicates that the "show more" item should be included 360 * in the list. 361 * @return 362 */ 363 private int getConversationCount() { 364 synchronized (sWidgetLock) { 365 final int cursorCount = mConversationCursor != null ? 366 mConversationCursor.getCount() : 0; 367 return Math.min(cursorCount, MAX_CONVERSATIONS_COUNT); 368 } 369 } 370 371 /** 372 * @return the {@link RemoteViews} for a specific position in the list. 373 */ 374 @Override 375 public RemoteViews getViewAt(int position) { 376 synchronized (sWidgetLock) { 377 // "View more conversations" view. 378 if (mConversationCursor == null || mConversationCursor.isClosed() 379 || (mShouldShowViewMore && position >= getConversationCount())) { 380 return getViewMoreConversationsView(); 381 } 382 383 if (!mConversationCursor.moveToPosition(position)) { 384 // If we ever fail to move to a position, return the 385 // "View More conversations" 386 // view. 387 LogUtils.e(LOG_TAG, "Failed to move to position %d in the cursor.", position); 388 return getViewMoreConversationsView(); 389 } 390 391 Conversation conversation = new Conversation(mConversationCursor); 392 // Split the senders and status from the instructions. 393 SpannableStringBuilder senderBuilder = new SpannableStringBuilder(); 394 395 if (conversation.conversationInfo != null) { 396 ArrayList<SpannableString> senders = new ArrayList<SpannableString>(); 397 SendersView.format(mContext, conversation.conversationInfo, "", 398 MAX_SENDERS_LENGTH, senders, null, null, mAccount.name, true); 399 senderBuilder = ellipsizeStyledSenders(senders); 400 } else { 401 senderBuilder.append(conversation.senders); 402 senderBuilder.setSpan(conversation.read ? getReadStyle() : getUnreadStyle(), 0, 403 senderBuilder.length(), 0); 404 } 405 // Get styled date. 406 CharSequence date = DateUtils.getRelativeTimeSpanString(mContext, 407 conversation.dateMs); 408 409 final int ignoreFolderType; 410 if ((mFolderType & FolderType.INBOX) != 0) { 411 ignoreFolderType = FolderType.INBOX; 412 } else { 413 ignoreFolderType = -1; 414 } 415 416 // Load up our remote view. 417 RemoteViews remoteViews = mWidgetConversationViewBuilder.getStyledView(date, 418 conversation, new FolderUri(mFolderUri), ignoreFolderType, 419 senderBuilder, filterTag(conversation.subject)); 420 421 // On click intent. 422 remoteViews.setOnClickFillInIntent(R.id.widget_conversation, 423 Utils.createViewConversationIntent(mContext, conversation, mFolderUri, 424 mAccount)); 425 426 return remoteViews; 427 } 428 } 429 430 private CharacterStyle getUnreadStyle() { 431 if (mUnreadStyle == null) { 432 mUnreadStyle = new TextAppearanceSpan(mContext, 433 R.style.SendersUnreadTextAppearance); 434 } 435 return CharacterStyle.wrap(mUnreadStyle); 436 } 437 438 private CharacterStyle getReadStyle() { 439 if (mReadStyle == null) { 440 mReadStyle = new TextAppearanceSpan(mContext, R.style.SendersReadTextAppearance); 441 } 442 return CharacterStyle.wrap(mReadStyle); 443 } 444 445 private SpannableStringBuilder ellipsizeStyledSenders( 446 ArrayList<SpannableString> styledSenders) { 447 SpannableStringBuilder builder = new SpannableStringBuilder(); 448 SpannableString prevSender = null; 449 for (SpannableString sender : styledSenders) { 450 if (sender == null) { 451 LogUtils.e(LOG_TAG, "null sender while iterating over styledSenders"); 452 continue; 453 } 454 CharacterStyle[] spans = sender.getSpans(0, sender.length(), CharacterStyle.class); 455 if (SendersView.sElidedString.equals(sender.toString())) { 456 prevSender = sender; 457 sender = copyStyles(spans, mElidedPaddingToken + sender + mElidedPaddingToken); 458 } else if (builder.length() > 0 459 && (prevSender == null || !SendersView.sElidedString.equals(prevSender 460 .toString()))) { 461 prevSender = sender; 462 sender = copyStyles(spans, mSendersSplitToken + sender); 463 } else { 464 prevSender = sender; 465 } 466 builder.append(sender); 467 } 468 return builder; 469 } 470 471 private static SpannableString copyStyles(CharacterStyle[] spans, CharSequence newText) { 472 SpannableString s = new SpannableString(newText); 473 if (spans != null && spans.length > 0) { 474 s.setSpan(spans[0], 0, s.length(), 0); 475 } 476 return s; 477 } 478 479 /** 480 * @return the "View more conversations" view. 481 */ 482 private RemoteViews getViewMoreConversationsView() { 483 RemoteViews view = new RemoteViews(mContext.getPackageName(), R.layout.widget_loading); 484 view.setTextViewText( 485 R.id.loading_text, mContext.getText(R.string.view_more_conversations)); 486 view.setOnClickFillInIntent(R.id.widget_loading, 487 Utils.createViewFolderIntent(mContext, mFolderUri, mAccount)); 488 return view; 489 } 490 491 @Override 492 public RemoteViews getLoadingView() { 493 RemoteViews view = new RemoteViews(mContext.getPackageName(), R.layout.widget_loading); 494 view.setTextViewText( 495 R.id.loading_text, mContext.getText(R.string.loading_conversation)); 496 return view; 497 } 498 499 @Override 500 public int getViewTypeCount() { 501 return 2; 502 } 503 504 @Override 505 public long getItemId(int position) { 506 return position; 507 } 508 509 @Override 510 public boolean hasStableIds() { 511 return false; 512 } 513 514 @Override 515 public void onLoadComplete(Loader<Cursor> loader, Cursor data) { 516 final AppWidgetManager appWidgetManager = AppWidgetManager.getInstance(mContext); 517 final RemoteViews remoteViews = 518 new RemoteViews(mContext.getPackageName(), R.layout.widget); 519 520 if (loader == mFolderLoader) { 521 if (!isDataValid(data)) { 522 return; 523 } 524 525 final int unreadCount = data.getInt(UIProvider.FOLDER_UNREAD_COUNT_COLUMN); 526 final String folderName = data.getString(UIProvider.FOLDER_NAME_COLUMN); 527 mFolderCount = data.getInt(UIProvider.FOLDER_TOTAL_COUNT_COLUMN); 528 529 if (!mFolderInformationShown && !TextUtils.isEmpty(folderName) && 530 !TextUtils.isEmpty(mAccount.name)) { 531 // We want to do a full update to the widget at least once, as the widget 532 // manager doesn't cache the state of the remote views when doing a partial 533 // widget update. This causes the folder name to be shown as blank if the state 534 // of the widget is restored. 535 mService.configureValidAccountWidget(mContext, remoteViews, mAppWidgetId, 536 mAccount, mFolderType, mFolderUri, mFolderConversationListUri, 537 folderName); 538 appWidgetManager.updateAppWidget(mAppWidgetId, remoteViews); 539 mFolderInformationShown = true; 540 } 541 542 // There is no reason to overwrite a valid non-null folder name with an empty string 543 if (!TextUtils.isEmpty(folderName)) { 544 remoteViews.setViewVisibility(R.id.widget_folder, View.VISIBLE); 545 remoteViews.setTextViewText(R.id.widget_folder, folderName); 546 } else { 547 LogUtils.e(LOG_TAG, "Empty folder name"); 548 } 549 if (!TextUtils.isEmpty(mAccount.name)) { 550 remoteViews.setTextViewText(R.id.widget_account, mAccount.name); 551 } 552 553 final String unreadCountString = Utils.getUnreadCountString(mContext, unreadCount); 554 555 // If there are 0 unread messages, hide the unread count text view. 556 // Otherwise, show the unread count. 557 if ("".equals(unreadCountString)) { 558 remoteViews.setViewVisibility(R.id.widget_unread_count, View.GONE); 559 } else { 560 remoteViews.setViewVisibility(R.id.widget_unread_count, View.VISIBLE); 561 remoteViews.setTextViewText(R.id.widget_unread_count, unreadCountString); 562 } 563 564 appWidgetManager.partiallyUpdateAppWidget(mAppWidgetId, remoteViews); 565 } else if (loader == mConversationCursorLoader) { 566 // We want to cache the new cursor 567 synchronized (sWidgetLock) { 568 if (!isDataValid(data)) { 569 mConversationCursor = null; 570 } else { 571 mConversationCursor = data; 572 } 573 } 574 575 appWidgetManager.notifyAppWidgetViewDataChanged(mAppWidgetId, 576 R.id.conversation_list); 577 578 if (mConversationCursor == null || mConversationCursor.getCount() == 0) { 579 remoteViews.setTextViewText(R.id.empty_conversation_list, 580 mContext.getString(R.string.no_conversations)); 581 appWidgetManager.partiallyUpdateAppWidget(mAppWidgetId, remoteViews); 582 } 583 } 584 } 585 586 /** 587 * Returns a boolean indicating whether this cursor has valid data. 588 * Note: This seeks to the first position in the cursor 589 */ 590 private static boolean isDataValid(Cursor cursor) { 591 return cursor != null && !cursor.isClosed() && cursor.moveToFirst(); 592 } 593 594 /** 595 * If the subject contains the tag of a mailing-list (text surrounded with []), return the 596 * subject with that tag ellipsized, e.g. "[android-gmail-team] Hello" -> "[andr...] Hello" 597 */ 598 private static String filterTag(String subject) { 599 String result = subject; 600 if (subject.length() > 0 && subject.charAt(0) == '[') { 601 int end = subject.indexOf(']'); 602 if (end > 0) { 603 String tag = subject.substring(1, end); 604 result = "[" + Utils.ellipsize(tag, 7) + "]" + subject.substring(end + 1); 605 } 606 } 607 608 return result; 609 } 610 611 /** 612 * A {@link DelayedTaskHandler} to throttle folder update to a reasonable rate. 613 */ 614 private class FolderUpdateHandler extends DelayedTaskHandler { 615 public FolderUpdateHandler(int refreshDelay) { 616 super(Looper.myLooper(), refreshDelay); 617 } 618 619 @Override 620 protected void performTask() { 621 // Start the loader. The cached data will be returned if present. 622 if (mFolderLoader != null) { 623 mFolderLoader.startLoading(); 624 } 625 } 626 } 627 } 628} 629