WidgetProvider.java revision 02ba344cf2489dba81058e25e3202f2898360083
1/* 2 * Copyright (C) 2010 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 */ 16 17package com.android.email.provider; 18 19import com.android.email.Email; 20import com.android.email.R; 21import com.android.email.ResourceHelper; 22import com.android.email.Utility; 23import com.android.email.activity.MessageCompose; 24import com.android.email.activity.Welcome; 25import com.android.email.data.ThrottlingCursorLoader; 26import com.android.email.provider.EmailContent.Account; 27import com.android.email.provider.EmailContent.AccountColumns; 28import com.android.email.provider.EmailContent.Mailbox; 29import com.android.email.provider.EmailContent.Message; 30import com.android.email.provider.EmailContent.MessageColumns; 31 32import android.app.Activity; 33import android.app.PendingIntent; 34import android.app.Service; 35import android.appwidget.AppWidgetManager; 36import android.appwidget.AppWidgetProvider; 37import android.content.ContentResolver; 38import android.content.ContentUris; 39import android.content.Context; 40import android.content.Intent; 41import android.content.Loader; 42import android.content.res.Resources; 43import android.database.Cursor; 44import android.graphics.Typeface; 45import android.net.Uri; 46import android.net.Uri.Builder; 47import android.os.AsyncTask; 48import android.os.Bundle; 49import android.text.Spannable; 50import android.text.SpannableString; 51import android.text.SpannableStringBuilder; 52import android.text.TextUtils; 53import android.text.format.DateUtils; 54import android.text.style.AbsoluteSizeSpan; 55import android.text.style.ForegroundColorSpan; 56import android.text.style.StyleSpan; 57import android.util.Log; 58import android.view.View; 59import android.widget.RemoteViews; 60import android.widget.RemoteViewsService; 61 62import java.io.FileDescriptor; 63import java.io.PrintWriter; 64import java.util.List; 65import java.util.Map; 66import java.util.concurrent.ConcurrentHashMap; 67 68public class WidgetProvider extends AppWidgetProvider { 69 private static final String TAG = "WidgetProvider"; 70 71 /** 72 * When handling clicks in a widget ListView, a single PendingIntent template is provided to 73 * RemoteViews, and the individual "on click" actions are distinguished via a "fillInIntent" 74 * on each list element; when a click is received, this "fillInIntent" is merged with the 75 * PendingIntent using Intent.fillIn(). Since this mechanism does NOT preserve the Extras 76 * Bundle, we instead encode information about the action (e.g. view, reply, etc.) and its 77 * arguments (e.g. messageId, mailboxId, etc.) in an Uri which is added to the Intent via 78 * Intent.setDataAndType() 79 * 80 * The mime type MUST be set in the Intent, even though we do not use it; therefore, it's value 81 * is entirely arbitrary. 82 * 83 * Our "command" Uri is NOT used by the system in any manner, and is therefore constrained only 84 * in the requirement that it be syntactically valid. 85 * 86 * We use the following convention for our commands: 87 * widget://command/<command>/<arg1>[/<arg2>] 88 */ 89 private static final String WIDGET_DATA_MIME_TYPE = "com.android.email/widget_data"; 90 private static final Uri COMMAND_URI = Uri.parse("widget://command"); 91 92 // Command names and Uri's built upon COMMAND_URI 93 private static final String COMMAND_NAME_SWITCH_LIST_VIEW = "switch_list_view"; 94 private static final Uri COMMAND_URI_SWITCH_LIST_VIEW = 95 COMMAND_URI.buildUpon().appendPath(COMMAND_NAME_SWITCH_LIST_VIEW).build(); 96 private static final String COMMAND_NAME_VIEW_MESSAGE = "view_message"; 97 private static final Uri COMMAND_URI_VIEW_MESSAGE = 98 COMMAND_URI.buildUpon().appendPath(COMMAND_NAME_VIEW_MESSAGE).build(); 99 100 private static final int TOTAL_COUNT_UNKNOWN = -1; 101 private static final int MAX_MESSAGE_LIST_COUNT = 25; 102 103 private static final String[] NO_ARGUMENTS = new String[0]; 104 private static final String SORT_TIMESTAMP_DESCENDING = MessageColumns.TIMESTAMP + " DESC"; 105 private static final String SORT_ID_ASCENDING = AccountColumns.ID + " ASC"; 106 private static final String[] ID_NAME_PROJECTION = {Account.RECORD_ID, Account.DISPLAY_NAME}; 107 private static final int ID_NAME_COLUMN_ID = 0; 108 private static final int ID_NAME_COLUMN_NAME = 1; 109 110 111 // Map holding our instantiated widgets, accessed by widget id 112 private final static Map<Integer, EmailWidget> sWidgetMap 113 = new ConcurrentHashMap<Integer, EmailWidget>(); 114 private static AppWidgetManager sWidgetManager; 115 private static Context sContext; 116 private static ContentResolver sResolver; 117 118 private static int sSenderFontSize; 119 private static int sSubjectFontSize; 120 private static int sDateFontSize; 121 private static int sDefaultTextColor; 122 private static int sLightTextColor; 123 private static String sSubjectSnippetDivider; 124 private static String sConfigureText; 125 126 /** 127 * Types of views that we're prepared to show in the widget - all mail, unread mail, and starred 128 * mail; we rotate between them. Each ViewType is composed of a selection string and a title. 129 */ 130 /* package */ enum ViewType { 131 ALL_INBOX(Message.INBOX_SELECTION, NO_ARGUMENTS, R.string.widget_all_mail), 132 UNREAD(Message.UNREAD_SELECTION, NO_ARGUMENTS, R.string.widget_unread), 133 STARRED(Message.ALL_FAVORITE_SELECTION, NO_ARGUMENTS, R.string.widget_starred), 134 ACCOUNT(Message.PER_ACCOUNT_INBOX_SELECTION, new String[1], 0); 135 136 /* package */ final String selection; 137 /* package */ final String[] selectionArgs; 138 private final int titleResource; 139 private String title; 140 141 ViewType(String _selection, String[] _selectionArgs, int _titleResource) { 142 selection = _selection; 143 selectionArgs = _selectionArgs; 144 titleResource = _titleResource; 145 } 146 147 public String getTitle(Context context) { 148 if (title == null && titleResource != 0) { 149 title = context.getString(titleResource); 150 } 151 return title; 152 } 153 154 @Override 155 public String toString() { 156 StringBuilder sb = new StringBuilder("ViewType:selection="); 157 sb.append("\""); 158 sb.append(selection); 159 sb.append("\""); 160 if (selectionArgs != null && selectionArgs.length > 0) { 161 sb.append(",args=("); 162 for (String arg : selectionArgs) { 163 sb.append(arg); 164 sb.append(", "); 165 } 166 sb.append(")"); 167 } 168 169 return sb.toString(); 170 } 171 } 172 173 static class EmailWidget implements RemoteViewsService.RemoteViewsFactory { 174 // The widget identifier 175 private final int mWidgetId; 176 177 // The cursor underlying the message list for this widget; this must only be modified while 178 // holding mCursorLock 179 private volatile Cursor mCursor; 180 // A lock on our cursor, which is used in the UI thread while inflating views, and by 181 // our Loader in the background 182 private final Object mCursorLock = new Object(); 183 // Number of records in the cursor 184 private int mCursorCount = TOTAL_COUNT_UNKNOWN; 185 // The widget's loader (derived from ThrottlingCursorLoader) 186 private WidgetLoader mLoader; 187 private final ResourceHelper mResourceHelper; 188 189 // The current view type (all mail, unread, or starred for now) 190 /*package*/ ViewType mViewType = ViewType.STARRED; 191 192 // The projection to be used by the WidgetLoader 193 public static final String[] WIDGET_PROJECTION = new String[] { 194 EmailContent.RECORD_ID, MessageColumns.DISPLAY_NAME, MessageColumns.TIMESTAMP, 195 MessageColumns.SUBJECT, MessageColumns.FLAG_READ, MessageColumns.FLAG_FAVORITE, 196 MessageColumns.FLAG_ATTACHMENT, MessageColumns.MAILBOX_KEY, MessageColumns.SNIPPET, 197 MessageColumns.ACCOUNT_KEY, MessageColumns.FLAGS 198 }; 199 public static final int WIDGET_COLUMN_ID = 0; 200 public static final int WIDGET_COLUMN_DISPLAY_NAME = 1; 201 public static final int WIDGET_COLUMN_TIMESTAMP = 2; 202 public static final int WIDGET_COLUMN_SUBJECT = 3; 203 public static final int WIDGET_COLUMN_FLAG_READ = 4; 204 public static final int WIDGET_COLUMN_FLAG_FAVORITE = 5; 205 public static final int WIDGET_COLUMN_FLAG_ATTACHMENT = 6; 206 public static final int WIDGET_COLUMN_MAILBOX_KEY = 7; 207 public static final int WIDGET_COLUMN_SNIPPET = 8; 208 public static final int WIDGET_COLUMN_ACCOUNT_KEY = 9; 209 public static final int WIDGET_COLUMN_FLAGS = 10; 210 211 public EmailWidget(int _widgetId) { 212 super(); 213 if (Email.DEBUG) { 214 Log.d(TAG, "Creating EmailWidget with id = " + _widgetId); 215 } 216 mWidgetId = _widgetId; 217 mLoader = new WidgetLoader(); 218 if (sSubjectSnippetDivider == null) { 219 // Initialize string, color, dimension resources 220 Resources res = sContext.getResources(); 221 sSubjectSnippetDivider = 222 res.getString(R.string.message_list_subject_snippet_divider); 223 sSenderFontSize = res.getDimensionPixelSize(R.dimen.widget_senders_font_size); 224 sSubjectFontSize = res.getDimensionPixelSize(R.dimen.widget_subject_font_size); 225 sDateFontSize = res.getDimensionPixelSize(R.dimen.widget_date_font_size); 226 sDefaultTextColor = res.getColor(R.color.widget_default_text_color); 227 sDefaultTextColor = res.getColor(R.color.widget_default_text_color); 228 sLightTextColor = res.getColor(R.color.widget_light_text_color); 229 sConfigureText = res.getString(R.string.widget_other_views); 230 } 231 mResourceHelper = ResourceHelper.getInstance(sContext); 232 } 233 234 /** 235 * The ThrottlingCursorLoader does all of the heavy lifting in managing the data loading 236 * task; all we need is to register a listener so that we're notified when the load is 237 * complete. 238 */ 239 final class WidgetLoader extends ThrottlingCursorLoader { 240 protected WidgetLoader() { 241 super(sContext, Message.CONTENT_URI, WIDGET_PROJECTION, mViewType.selection, 242 mViewType.selectionArgs, SORT_TIMESTAMP_DESCENDING); 243 registerListener(0, new OnLoadCompleteListener<Cursor>() { 244 @Override 245 public void onLoadComplete(Loader<Cursor> loader, Cursor cursor) { 246 synchronized (mCursorLock) { 247 // Save away the cursor 248 mCursor = cursor; 249 // Reset the notification Uri to our Message table notifier URI 250 mCursor.setNotificationUri(sResolver, Message.NOTIFIER_URI); 251 // Save away the count (for display) 252 mCursorCount = mCursor.getCount(); 253 if (Email.DEBUG) { 254 Log.d(TAG, "onLoadComplete, count = " + cursor.getCount()); 255 } 256 } 257 RemoteViews views = 258 new RemoteViews(sContext.getPackageName(), R.layout.widget); 259 setupTitleAndCount(views); 260 sWidgetManager.partiallyUpdateAppWidget(mWidgetId, views); 261 sWidgetManager.notifyAppWidgetViewDataChanged(mWidgetId, R.id.message_list); 262 } 263 }); 264 } 265 266 /** 267 * Stop any pending load, reset selection parameters, and start loading 268 * Must be called from the UI thread 269 * @param viewType the current ViewType 270 */ 271 private void load(ViewType viewType) { 272 reset(); 273 setSelection(viewType.selection); 274 setSelectionArgs(viewType.selectionArgs); 275 startLoading(); 276 } 277 } 278 279 /** 280 * Initialize to first appropriate view (depending on the number of accounts) 281 */ 282 private void init() { 283 new WidgetViewSwitcher(this).execute(); 284 } 285 286 /** 287 * Reset cursor and cursor count, notify widget that list data is invalid, and start loading 288 * with our current ViewType 289 */ 290 private void loadView() { 291 synchronized(mCursorLock) { 292 mCursorCount = TOTAL_COUNT_UNKNOWN; 293 mCursor = null; 294 sWidgetManager.notifyAppWidgetViewDataChanged(mWidgetId, R.id.message_list); 295 mLoader.load(mViewType); 296 } 297 } 298 299 /** 300 * Switch to the next widget view (all -> account1 -> ... -> account n -> unread -> starred) 301 * This must be called on a background thread 302 */ 303 public synchronized void switchToNextView() { 304 switch(mViewType) { 305 // If we're in starred and there is more than one account, go to "all mail" 306 // Otherwise, fall through to the accounts themselves 307 case STARRED: 308 if (EmailContent.count(sContext, Account.CONTENT_URI) > 1) { 309 mViewType = ViewType.ALL_INBOX; 310 break; 311 } 312 //$FALL-THROUGH$ 313 case ALL_INBOX: 314 ViewType.ACCOUNT.selectionArgs[0] = "0"; 315 //$FALL-THROUGH$ 316 case ACCOUNT: 317 // Find the next account (or, if none, default to UNREAD) 318 String idString = ViewType.ACCOUNT.selectionArgs[0]; 319 Cursor c = sResolver.query(Account.CONTENT_URI, ID_NAME_PROJECTION, "_id>?", 320 new String[] {idString}, SORT_ID_ASCENDING); 321 try { 322 if (c.moveToFirst()) { 323 mViewType = ViewType.ACCOUNT; 324 mViewType.selectionArgs[0] = c.getString(ID_NAME_COLUMN_ID); 325 mViewType.title = c.getString(ID_NAME_COLUMN_NAME); 326 } else { 327 mViewType = ViewType.UNREAD; 328 } 329 } finally { 330 c.close(); 331 } 332 break; 333 case UNREAD: 334 mViewType = ViewType.STARRED; 335 break; 336 } 337 } 338 339 /** 340 * Convenience method for creating an onClickPendingIntent that executes a command via 341 * our command Uri. Used for the "next view" command; appends the widget id to the command 342 * Uri. 343 * 344 * @param views The RemoteViews we're inflating 345 * @param buttonId the id of the button view 346 * @param data the command Uri 347 */ 348 private void setCommandIntent(RemoteViews views, int buttonId, Uri data) { 349 Intent intent = new Intent(sContext, WidgetService.class); 350 intent.setDataAndType(ContentUris.withAppendedId(data, mWidgetId), 351 WIDGET_DATA_MIME_TYPE); 352 PendingIntent pendingIntent = PendingIntent.getService(sContext, 0, intent, 353 PendingIntent.FLAG_UPDATE_CURRENT); 354 views.setOnClickPendingIntent(buttonId, pendingIntent); 355 } 356 357 /** 358 * Convenience method for creating an onClickPendingIntent that launches another activity 359 * directly. Used for the "Compose" button 360 * 361 * @param views The RemoteViews we're inflating 362 * @param buttonId the id of the button view 363 * @param activityClass the class of the activity to be launched 364 */ 365 private void setActivityIntent(RemoteViews views, int buttonId, 366 Class<? extends Activity> activityClass) { 367 Intent intent = new Intent(sContext, activityClass); 368 PendingIntent pendingIntent = PendingIntent.getActivity(sContext, 0, intent, 0); 369 views.setOnClickPendingIntent(buttonId, pendingIntent); 370 } 371 372 /** 373 * Convenience method for constructing a fillInIntent for a given list view element. 374 * Appends the command and any arguments to a base Uri. 375 * 376 * @param views the RemoteViews we are inflating 377 * @param viewId the id of the view 378 * @param baseUri the base uri for the command 379 * @param args any arguments to the command 380 */ 381 private void setFillInIntent(RemoteViews views, int viewId, Uri baseUri, String ... args) { 382 Intent intent = new Intent(); 383 Builder builder = baseUri.buildUpon(); 384 for (String arg: args) { 385 builder.appendPath(arg); 386 } 387 intent.setDataAndType(builder.build(), WIDGET_DATA_MIME_TYPE); 388 views.setOnClickFillInIntent(viewId, intent); 389 } 390 391 private void setupTitleAndCount(RemoteViews views) { 392 // Set up the title (view type + count of messages) 393 views.setTextViewText(R.id.widget_title, mViewType.getTitle(sContext)); 394 views.setTextViewText(R.id.widget_tap, sConfigureText); 395 String count = ""; 396 if (mCursorCount != TOTAL_COUNT_UNKNOWN) { 397 count = Integer.toString(mCursor.getCount()); 398 } 399 views.setTextViewText(R.id.widget_count, count); 400 } 401 /** 402 * Update the "header" of the widget (i.e. everything that doesn't include the scrolling 403 * message list) 404 */ 405 private void updateHeader() { 406 if (Email.DEBUG) { 407 Log.d(TAG, "updateWidget " + mWidgetId); 408 } 409 410 // Get the widget layout 411 RemoteViews views = new RemoteViews(sContext.getPackageName(), R.layout.widget); 412 413 // Set up the list with an adapter 414 Intent intent = new Intent(sContext, WidgetService.class); 415 intent.putExtra(AppWidgetManager.EXTRA_APPWIDGET_ID, mWidgetId); 416 intent.setData(Uri.parse(intent.toUri(Intent.URI_INTENT_SCHEME))); 417 views.setRemoteAdapter(mWidgetId, R.id.message_list, intent); 418 419 setupTitleAndCount(views); 420 421 // Set up "new" button (compose new message) and "next view" button 422 setActivityIntent(views, R.id.widget_compose, MessageCompose.class); 423 setCommandIntent(views, R.id.widget_logo, COMMAND_URI_SWITCH_LIST_VIEW); 424 425 // Use a bare intent for our template; we need to fill everything in 426 intent = new Intent(sContext, WidgetService.class); 427 PendingIntent pendingIntent = 428 PendingIntent.getService(sContext, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT); 429 views.setPendingIntentTemplate(R.id.message_list, pendingIntent); 430 431 // And finally update the widget 432 sWidgetManager.updateAppWidget(mWidgetId, views); 433 } 434 435 /** 436 * Add size and color styling to text 437 * 438 * @param text the text to style 439 * @param size the font size for this text 440 * @param color the color for this text 441 * @return a CharSequence quitable for use in RemoteViews.setTextViewText() 442 */ 443 private CharSequence addStyle(CharSequence text, int size, int color) { 444 SpannableStringBuilder builder = new SpannableStringBuilder(text); 445 builder.setSpan( 446 new AbsoluteSizeSpan(size), 0, text.length(), 447 Spannable.SPAN_EXCLUSIVE_EXCLUSIVE); 448 if (color != 0) { 449 builder.setSpan(new ForegroundColorSpan(color), 0, text.length(), 450 Spannable.SPAN_EXCLUSIVE_EXCLUSIVE); 451 } 452 return builder; 453 } 454 455 /** 456 * Create styled text for our combination subject and snippet 457 * 458 * @param subject the message's subject (or null) 459 * @param snippet the message's snippet (or null) 460 * @param read whether or not the message is read 461 * @return a CharSequence suitable for use in RemoteViews.setTextViewText() 462 */ 463 private CharSequence getStyledSubjectSnippet (String subject, String snippet, 464 boolean read) { 465 SpannableStringBuilder ssb = new SpannableStringBuilder(); 466 boolean hasSubject = false; 467 if (!TextUtils.isEmpty(subject)) { 468 SpannableString ss = new SpannableString(subject); 469 ss.setSpan(new StyleSpan(read ? Typeface.NORMAL : Typeface.BOLD), 0, ss.length(), 470 Spannable.SPAN_EXCLUSIVE_EXCLUSIVE); 471 ss.setSpan(new ForegroundColorSpan(sDefaultTextColor), 0, ss.length(), 472 Spannable.SPAN_EXCLUSIVE_EXCLUSIVE); 473 ssb.append(ss); 474 hasSubject = true; 475 } 476 if (!TextUtils.isEmpty(snippet)) { 477 if (hasSubject) { 478 ssb.append(sSubjectSnippetDivider); 479 } 480 SpannableString ss = new SpannableString(snippet); 481 ss.setSpan(new ForegroundColorSpan(sLightTextColor), 0, snippet.length(), 482 Spannable.SPAN_EXCLUSIVE_EXCLUSIVE); 483 ssb.append(ss); 484 } 485 return addStyle(ssb, sSubjectFontSize, 0); 486 } 487 488 /* (non-Javadoc) 489 * @see android.widget.RemoteViewsService.RemoteViewsFactory#getViewAt(int) 490 */ 491 public RemoteViews getViewAt(int position) { 492 // Use the cursor to set up the widget 493 synchronized (mCursorLock) { 494 if (mCursor == null || mCursor.isClosed() || !mCursor.moveToPosition(position)) { 495 return getLoadingView(); 496 } 497 RemoteViews views = 498 new RemoteViews(sContext.getPackageName(), R.layout.widget_list_item); 499 boolean isUnread = mCursor.getInt(WIDGET_COLUMN_FLAG_READ) != 1; 500 int drawableId = R.drawable.widget_read_conversation_selector; 501 if (isUnread) { 502 drawableId = R.drawable.widget_unread_conversation_selector; 503 } 504 views.setInt(R.id.widget_message, "setBackgroundResource", drawableId); 505 506 // Add style to sender 507 SpannableStringBuilder from = 508 new SpannableStringBuilder(mCursor.getString(WIDGET_COLUMN_DISPLAY_NAME)); 509 from.setSpan( 510 isUnread ? new StyleSpan(Typeface.BOLD) : new StyleSpan(Typeface.NORMAL), 0, 511 from.length(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE); 512 CharSequence styledFrom = addStyle(from, sSenderFontSize, sDefaultTextColor); 513 views.setTextViewText(R.id.widget_from, styledFrom); 514 515 long timestamp = mCursor.getLong(WIDGET_COLUMN_TIMESTAMP); 516 // Get a nicely formatted date string (relative to today) 517 String date = DateUtils.getRelativeTimeSpanString(sContext, timestamp).toString(); 518 // Add style to date 519 CharSequence styledDate = addStyle(date, sDateFontSize, sDefaultTextColor); 520 views.setTextViewText(R.id.widget_date, styledDate); 521 522 // Add style to subject/snippet 523 String subject = mCursor.getString(WIDGET_COLUMN_SUBJECT); 524 String snippet = mCursor.getString(WIDGET_COLUMN_SNIPPET); 525 CharSequence subjectAndSnippet = 526 getStyledSubjectSnippet(subject, snippet, !isUnread); 527 views.setTextViewText(R.id.widget_subject, subjectAndSnippet); 528 529 int messageFlags = mCursor.getInt(WIDGET_COLUMN_FLAGS); 530 boolean hasInvite = (messageFlags & Message.FLAG_INCOMING_MEETING_INVITE) != 0; 531 views.setViewVisibility(R.id.widget_invite, hasInvite ? View.VISIBLE : View.GONE); 532 533 boolean hasAttachment = mCursor.getInt(WIDGET_COLUMN_FLAG_ATTACHMENT) != 0; 534 views.setViewVisibility(R.id.widget_attachment, 535 hasAttachment ? View.VISIBLE : View.GONE); 536 537 if (mViewType == ViewType.ACCOUNT) { 538 views.setViewVisibility(R.id.color_chip, View.INVISIBLE); 539 } else { 540 long accountId = mCursor.getLong(WIDGET_COLUMN_ACCOUNT_KEY); 541 int colorId = mResourceHelper.getAccountColorId(accountId); 542 if (colorId != ResourceHelper.UNDEFINED_RESOURCE_ID) { 543 // Color defined by resource ID, so, use it 544 views.setViewVisibility(R.id.color_chip, View.VISIBLE); 545 views.setImageViewResource(R.id.color_chip, colorId); 546 } else { 547 // Color not defined by resource ID, nothing we can do, so, hide the chip 548 views.setViewVisibility(R.id.color_chip, View.INVISIBLE); 549 } 550 } 551 552 // Set button intents for view, reply, and delete 553 String messageId = mCursor.getString(WIDGET_COLUMN_ID); 554 String mailboxId = mCursor.getString(WIDGET_COLUMN_MAILBOX_KEY); 555 setFillInIntent(views, R.id.widget_message, COMMAND_URI_VIEW_MESSAGE, messageId, 556 mailboxId); 557 558 return views; 559 } 560 } 561 562 @Override 563 public int getCount() { 564 if (mCursor == null) return 0; 565 return Math.min(mCursor.getCount(), MAX_MESSAGE_LIST_COUNT); 566 } 567 568 @Override 569 public long getItemId(int position) { 570 return position; 571 } 572 573 @Override 574 public RemoteViews getLoadingView() { 575 RemoteViews view = new RemoteViews(sContext.getPackageName(), R.layout.widget_loading); 576 view.setTextViewText(R.id.loading_text, sContext.getString(R.string.widget_loading)); 577 return view; 578 } 579 580 @Override 581 public int getViewTypeCount() { 582 // Regular list view and the "loading" view 583 return 2; 584 } 585 586 @Override 587 public boolean hasStableIds() { 588 return true; 589 } 590 591 @Override 592 public void onDataSetChanged() { 593 } 594 595 private void onDeleted() { 596 if (mLoader != null) { 597 mLoader.stopLoading(); 598 } 599 sWidgetMap.remove(mWidgetId); 600 } 601 602 @Override 603 public void onDestroy() { 604 if (mLoader != null) { 605 mLoader.stopLoading(); 606 } 607 sWidgetMap.remove(mWidgetId); 608 } 609 610 @Override 611 public void onCreate() { 612 } 613 } 614 615 private static synchronized void update(Context context, int[] appWidgetIds) { 616 for (int widgetId: appWidgetIds) { 617 getOrCreateWidget(context, widgetId).updateHeader(); 618 } 619 } 620 621 /** 622 * Force a context for widgets (used by unit tests) 623 * @param context the Context to set 624 */ 625 /*package*/ static void setContextForTest(Context context) { 626 sContext = context; 627 sResolver = context.getContentResolver(); 628 sWidgetManager = AppWidgetManager.getInstance(context); 629 } 630 631 /*package*/ static EmailWidget getOrCreateWidget(Context context, int widgetId) { 632 // Lazily initialize these 633 if (sContext == null) { 634 sContext = context.getApplicationContext(); 635 sWidgetManager = AppWidgetManager.getInstance(context); 636 sResolver = context.getContentResolver(); 637 } 638 EmailWidget widget = sWidgetMap.get(widgetId); 639 if (widget == null) { 640 if (Email.DEBUG) { 641 Log.d(TAG, "Creating EmailWidget for id #" + widgetId); 642 } 643 widget = new EmailWidget(widgetId); 644 widget.init(); 645 sWidgetMap.put(widgetId, widget); 646 } 647 return widget; 648 } 649 650 @Override 651 public void onDisabled(Context context) { 652 super.onDisabled(context); 653 if (Email.DEBUG) { 654 Log.d(TAG, "onDisabled"); 655 } 656 context.stopService(new Intent(context, WidgetService.class)); 657 } 658 659 @Override 660 public void onEnabled(final Context context) { 661 super.onEnabled(context); 662 if (Email.DEBUG) { 663 Log.d(TAG, "onEnabled"); 664 } 665 } 666 667 @Override 668 public void onReceive(final Context context, Intent intent) { 669 String action = intent.getAction(); 670 if (AppWidgetManager.ACTION_APPWIDGET_UPDATE.equals(action)) { 671 Bundle extras = intent.getExtras(); 672 if (extras != null) { 673 final int[] appWidgetIds = extras.getIntArray(AppWidgetManager.EXTRA_APPWIDGET_IDS); 674 if (appWidgetIds != null && appWidgetIds.length > 0) { 675 update(context, appWidgetIds); 676 } 677 } 678 } else if (AppWidgetManager.ACTION_APPWIDGET_DELETED.equals(action)) { 679 Bundle extras = intent.getExtras(); 680 if (extras != null && extras.containsKey(AppWidgetManager.EXTRA_APPWIDGET_ID)) { 681 final int widgetId = extras.getInt(AppWidgetManager.EXTRA_APPWIDGET_ID); 682 // Find the widget in the map 683 EmailWidget widget = sWidgetMap.get(widgetId); 684 if (widget != null) { 685 // Stop loading and remove the widget from the map 686 widget.onDeleted(); 687 } 688 } 689 } 690 } 691 692 /** 693 * Utility class to handle switching widget views; in the background, we access the database 694 * to determine account status, etc. In the foreground, we start up the Loader with new 695 * parameters 696 */ 697 /*package*/ static class WidgetViewSwitcher extends AsyncTask<Void, Void, Void> { 698 private final EmailWidget mWidget; 699 private boolean mLoadAfterSwitch = true; 700 701 public WidgetViewSwitcher(EmailWidget widget) { 702 mWidget = widget; 703 } 704 705 /*package*/ void disableLoadAfterSwitchForTest() { 706 mLoadAfterSwitch = false; 707 } 708 709 @Override 710 protected Void doInBackground(Void... params) { 711 mWidget.switchToNextView(); 712 return null; 713 } 714 715 @Override 716 protected void onPostExecute(Void param) { 717 if (isCancelled()) { 718 return; 719 } 720 if (mLoadAfterSwitch) { 721 mWidget.loadView(); 722 } 723 } 724 } 725 726 /** 727 * We use the WidgetService for two purposes: 728 * 1) To provide a widget factory for RemoteViews, and 729 * 2) To process our command Uri's (i.e. take actions on user clicks) 730 */ 731 public static class WidgetService extends RemoteViewsService { 732 @Override 733 public RemoteViewsFactory onGetViewFactory(Intent intent) { 734 // Which widget do we want (nice alliteration, huh?) 735 int widgetId = intent.getIntExtra(AppWidgetManager.EXTRA_APPWIDGET_ID, -1); 736 if (widgetId == -1) return null; 737 // Find the existing widget or create it 738 return getOrCreateWidget(this, widgetId); 739 } 740 741 @Override 742 public void startActivity(Intent intent) { 743 // Since we're not calling startActivity from an Activity, we need the new task flag 744 intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_MULTIPLE_TASK); 745 super.startActivity(intent); 746 } 747 748 @Override 749 public int onStartCommand(Intent intent, int flags, int startId) { 750 Uri data = intent.getData(); 751 if (data == null) return Service.START_NOT_STICKY; 752 List<String> pathSegments = data.getPathSegments(); 753 // Our path segments are <command>, <arg1> [, <arg2>] 754 // First, a quick check of Uri validity 755 if (pathSegments.size() < 2) { 756 throw new IllegalArgumentException(); 757 } 758 String command = pathSegments.get(0); 759 // Ignore unknown action names 760 try { 761 final long arg1 = Long.parseLong(pathSegments.get(1)); 762 if (COMMAND_NAME_VIEW_MESSAGE.equals(command)) { 763 // "view", <message id>, <mailbox id> 764 final long mailboxId = Long.parseLong(pathSegments.get(2)); 765 final long messageId = arg1; 766 Utility.runAsync(new Runnable() { 767 @Override 768 public void run() { 769 openMessage(mailboxId, messageId); 770 } 771 }); 772 } else if (COMMAND_NAME_SWITCH_LIST_VIEW.equals(command)) { 773 // "next_view", <widget id> 774 EmailWidget widget = sWidgetMap.get((int)arg1); 775 if (widget != null) { 776 WidgetViewSwitcher switcher = new WidgetViewSwitcher(widget); 777 switcher.execute(); 778 } 779 } 780 } catch (NumberFormatException e) { 781 // Shouldn't happen as we construct all of the Uri's 782 } 783 return Service.START_NOT_STICKY; 784 } 785 786 private void openMessage(long mailboxId, long messageId) { 787 Mailbox mailbox = Mailbox.restoreMailboxWithId(this, mailboxId); 788 if (mailbox == null) return; 789 startActivity(Welcome.createOpenMessageIntent(this, mailbox.mAccountKey, mailboxId, 790 messageId)); 791 } 792 793 @Override 794 protected void dump(FileDescriptor fd, PrintWriter writer, String[] args) { 795 int n = 0; 796 for (EmailWidget widget : sWidgetMap.values()) { 797 writer.println("Widget #" + (++n)); 798 writer.println(" ViewType=" + widget.mViewType); 799 } 800 } 801 } 802} 803