1 /* 2 * Copyright (C) 2013 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 17 package android.provider; 18 19 import static android.net.TrafficStats.KB_IN_BYTES; 20 import static libcore.io.OsConstants.SEEK_SET; 21 22 import android.content.ContentProviderClient; 23 import android.content.ContentResolver; 24 import android.content.Context; 25 import android.content.Intent; 26 import android.content.pm.ResolveInfo; 27 import android.content.res.AssetFileDescriptor; 28 import android.database.Cursor; 29 import android.graphics.Bitmap; 30 import android.graphics.BitmapFactory; 31 import android.graphics.Matrix; 32 import android.graphics.Point; 33 import android.media.ExifInterface; 34 import android.net.Uri; 35 import android.os.Bundle; 36 import android.os.CancellationSignal; 37 import android.os.OperationCanceledException; 38 import android.os.ParcelFileDescriptor; 39 import android.os.ParcelFileDescriptor.OnCloseListener; 40 import android.os.RemoteException; 41 import android.util.Log; 42 43 import libcore.io.ErrnoException; 44 import libcore.io.IoUtils; 45 import libcore.io.Libcore; 46 47 import java.io.BufferedInputStream; 48 import java.io.File; 49 import java.io.FileDescriptor; 50 import java.io.FileInputStream; 51 import java.io.FileNotFoundException; 52 import java.io.IOException; 53 import java.util.List; 54 55 /** 56 * Defines the contract between a documents provider and the platform. 57 * <p> 58 * To create a document provider, extend {@link DocumentsProvider}, which 59 * provides a foundational implementation of this contract. 60 * 61 * @see DocumentsProvider 62 */ 63 public final class DocumentsContract { 64 private static final String TAG = "Documents"; 65 66 // content://com.example/root/ 67 // content://com.example/root/sdcard/ 68 // content://com.example/root/sdcard/recent/ 69 // content://com.example/root/sdcard/search/?query=pony 70 // content://com.example/document/12/ 71 // content://com.example/document/12/children/ 72 73 private DocumentsContract() { 74 } 75 76 /** 77 * Intent action used to identify {@link DocumentsProvider} instances. This 78 * is used in the {@code <intent-filter>} of a {@code <provider>}. 79 */ 80 public static final String PROVIDER_INTERFACE = "android.content.action.DOCUMENTS_PROVIDER"; 81 82 /** {@hide} */ 83 public static final String EXTRA_PACKAGE_NAME = "android.content.extra.PACKAGE_NAME"; 84 85 /** {@hide} */ 86 public static final String EXTRA_SHOW_ADVANCED = "android.content.extra.SHOW_ADVANCED"; 87 88 /** 89 * Included in {@link AssetFileDescriptor#getExtras()} when returned 90 * thumbnail should be rotated. 91 * 92 * @see MediaStore.Images.ImageColumns#ORIENTATION 93 * @hide 94 */ 95 public static final String EXTRA_ORIENTATION = "android.content.extra.ORIENTATION"; 96 97 /** {@hide} */ 98 public static final String ACTION_MANAGE_ROOT = "android.provider.action.MANAGE_ROOT"; 99 /** {@hide} */ 100 public static final String ACTION_MANAGE_DOCUMENT = "android.provider.action.MANAGE_DOCUMENT"; 101 102 /** 103 * Buffer is large enough to rewind past any EXIF headers. 104 */ 105 private static final int THUMBNAIL_BUFFER_SIZE = (int) (128 * KB_IN_BYTES); 106 107 /** 108 * Constants related to a document, including {@link Cursor} column names 109 * and flags. 110 * <p> 111 * A document can be either an openable stream (with a specific MIME type), 112 * or a directory containing additional documents (with the 113 * {@link #MIME_TYPE_DIR} MIME type). A directory represents the top of a 114 * subtree containing zero or more documents, which can recursively contain 115 * even more documents and directories. 116 * <p> 117 * All columns are <em>read-only</em> to client applications. 118 */ 119 public final static class Document { 120 private Document() { 121 } 122 123 /** 124 * Unique ID of a document. This ID is both provided by and interpreted 125 * by a {@link DocumentsProvider}, and should be treated as an opaque 126 * value by client applications. This column is required. 127 * <p> 128 * Each document must have a unique ID within a provider, but that 129 * single document may be included as a child of multiple directories. 130 * <p> 131 * A provider must always return durable IDs, since they will be used to 132 * issue long-term URI permission grants when an application interacts 133 * with {@link Intent#ACTION_OPEN_DOCUMENT} and 134 * {@link Intent#ACTION_CREATE_DOCUMENT}. 135 * <p> 136 * Type: STRING 137 */ 138 public static final String COLUMN_DOCUMENT_ID = "document_id"; 139 140 /** 141 * Concrete MIME type of a document. For example, "image/png" or 142 * "application/pdf" for openable files. A document can also be a 143 * directory containing additional documents, which is represented with 144 * the {@link #MIME_TYPE_DIR} MIME type. This column is required. 145 * <p> 146 * Type: STRING 147 * 148 * @see #MIME_TYPE_DIR 149 */ 150 public static final String COLUMN_MIME_TYPE = "mime_type"; 151 152 /** 153 * Display name of a document, used as the primary title displayed to a 154 * user. This column is required. 155 * <p> 156 * Type: STRING 157 */ 158 public static final String COLUMN_DISPLAY_NAME = OpenableColumns.DISPLAY_NAME; 159 160 /** 161 * Summary of a document, which may be shown to a user. This column is 162 * optional, and may be {@code null}. 163 * <p> 164 * Type: STRING 165 */ 166 public static final String COLUMN_SUMMARY = "summary"; 167 168 /** 169 * Timestamp when a document was last modified, in milliseconds since 170 * January 1, 1970 00:00:00.0 UTC. This column is required, and may be 171 * {@code null} if unknown. A {@link DocumentsProvider} can update this 172 * field using events from {@link OnCloseListener} or other reliable 173 * {@link ParcelFileDescriptor} transports. 174 * <p> 175 * Type: INTEGER (long) 176 * 177 * @see System#currentTimeMillis() 178 */ 179 public static final String COLUMN_LAST_MODIFIED = "last_modified"; 180 181 /** 182 * Specific icon resource ID for a document. This column is optional, 183 * and may be {@code null} to use a platform-provided default icon based 184 * on {@link #COLUMN_MIME_TYPE}. 185 * <p> 186 * Type: INTEGER (int) 187 */ 188 public static final String COLUMN_ICON = "icon"; 189 190 /** 191 * Flags that apply to a document. This column is required. 192 * <p> 193 * Type: INTEGER (int) 194 * 195 * @see #FLAG_SUPPORTS_WRITE 196 * @see #FLAG_SUPPORTS_DELETE 197 * @see #FLAG_SUPPORTS_THUMBNAIL 198 * @see #FLAG_DIR_PREFERS_GRID 199 * @see #FLAG_DIR_PREFERS_LAST_MODIFIED 200 */ 201 public static final String COLUMN_FLAGS = "flags"; 202 203 /** 204 * Size of a document, in bytes, or {@code null} if unknown. This column 205 * is required. 206 * <p> 207 * Type: INTEGER (long) 208 */ 209 public static final String COLUMN_SIZE = OpenableColumns.SIZE; 210 211 /** 212 * MIME type of a document which is a directory that may contain 213 * additional documents. 214 * 215 * @see #COLUMN_MIME_TYPE 216 */ 217 public static final String MIME_TYPE_DIR = "vnd.android.document/directory"; 218 219 /** 220 * Flag indicating that a document can be represented as a thumbnail. 221 * 222 * @see #COLUMN_FLAGS 223 * @see DocumentsContract#getDocumentThumbnail(ContentResolver, Uri, 224 * Point, CancellationSignal) 225 * @see DocumentsProvider#openDocumentThumbnail(String, Point, 226 * android.os.CancellationSignal) 227 */ 228 public static final int FLAG_SUPPORTS_THUMBNAIL = 1; 229 230 /** 231 * Flag indicating that a document supports writing. 232 * <p> 233 * When a document is opened with {@link Intent#ACTION_OPEN_DOCUMENT}, 234 * the calling application is granted both 235 * {@link Intent#FLAG_GRANT_READ_URI_PERMISSION} and 236 * {@link Intent#FLAG_GRANT_WRITE_URI_PERMISSION}. However, the actual 237 * writability of a document may change over time, for example due to 238 * remote access changes. This flag indicates that a document client can 239 * expect {@link ContentResolver#openOutputStream(Uri)} to succeed. 240 * 241 * @see #COLUMN_FLAGS 242 */ 243 public static final int FLAG_SUPPORTS_WRITE = 1 << 1; 244 245 /** 246 * Flag indicating that a document is deletable. 247 * 248 * @see #COLUMN_FLAGS 249 * @see DocumentsContract#deleteDocument(ContentResolver, Uri) 250 * @see DocumentsProvider#deleteDocument(String) 251 */ 252 public static final int FLAG_SUPPORTS_DELETE = 1 << 2; 253 254 /** 255 * Flag indicating that a document is a directory that supports creation 256 * of new files within it. Only valid when {@link #COLUMN_MIME_TYPE} is 257 * {@link #MIME_TYPE_DIR}. 258 * 259 * @see #COLUMN_FLAGS 260 * @see DocumentsContract#createDocument(ContentResolver, Uri, String, 261 * String) 262 * @see DocumentsProvider#createDocument(String, String, String) 263 */ 264 public static final int FLAG_DIR_SUPPORTS_CREATE = 1 << 3; 265 266 /** 267 * Flag indicating that a directory prefers its contents be shown in a 268 * larger format grid. Usually suitable when a directory contains mostly 269 * pictures. Only valid when {@link #COLUMN_MIME_TYPE} is 270 * {@link #MIME_TYPE_DIR}. 271 * 272 * @see #COLUMN_FLAGS 273 */ 274 public static final int FLAG_DIR_PREFERS_GRID = 1 << 4; 275 276 /** 277 * Flag indicating that a directory prefers its contents be sorted by 278 * {@link #COLUMN_LAST_MODIFIED}. Only valid when 279 * {@link #COLUMN_MIME_TYPE} is {@link #MIME_TYPE_DIR}. 280 * 281 * @see #COLUMN_FLAGS 282 */ 283 public static final int FLAG_DIR_PREFERS_LAST_MODIFIED = 1 << 5; 284 285 /** 286 * Flag indicating that document titles should be hidden when viewing 287 * this directory in a larger format grid. For example, a directory 288 * containing only images may want the image thumbnails to speak for 289 * themselves. Only valid when {@link #COLUMN_MIME_TYPE} is 290 * {@link #MIME_TYPE_DIR}. 291 * 292 * @see #COLUMN_FLAGS 293 * @see #FLAG_DIR_PREFERS_GRID 294 * @hide 295 */ 296 public static final int FLAG_DIR_HIDE_GRID_TITLES = 1 << 16; 297 } 298 299 /** 300 * Constants related to a root of documents, including {@link Cursor} column 301 * names and flags. A root is the start of a tree of documents, such as a 302 * physical storage device, or an account. Each root starts at the directory 303 * referenced by {@link Root#COLUMN_DOCUMENT_ID}, which can recursively 304 * contain both documents and directories. 305 * <p> 306 * All columns are <em>read-only</em> to client applications. 307 */ 308 public final static class Root { 309 private Root() { 310 } 311 312 /** 313 * Unique ID of a root. This ID is both provided by and interpreted by a 314 * {@link DocumentsProvider}, and should be treated as an opaque value 315 * by client applications. This column is required. 316 * <p> 317 * Type: STRING 318 */ 319 public static final String COLUMN_ROOT_ID = "root_id"; 320 321 /** 322 * Flags that apply to a root. This column is required. 323 * <p> 324 * Type: INTEGER (int) 325 * 326 * @see #FLAG_LOCAL_ONLY 327 * @see #FLAG_SUPPORTS_CREATE 328 * @see #FLAG_SUPPORTS_RECENTS 329 * @see #FLAG_SUPPORTS_SEARCH 330 */ 331 public static final String COLUMN_FLAGS = "flags"; 332 333 /** 334 * Icon resource ID for a root. This column is required. 335 * <p> 336 * Type: INTEGER (int) 337 */ 338 public static final String COLUMN_ICON = "icon"; 339 340 /** 341 * Title for a root, which will be shown to a user. This column is 342 * required. For a single storage service surfacing multiple accounts as 343 * different roots, this title should be the name of the service. 344 * <p> 345 * Type: STRING 346 */ 347 public static final String COLUMN_TITLE = "title"; 348 349 /** 350 * Summary for this root, which may be shown to a user. This column is 351 * optional, and may be {@code null}. For a single storage service 352 * surfacing multiple accounts as different roots, this summary should 353 * be the name of the account. 354 * <p> 355 * Type: STRING 356 */ 357 public static final String COLUMN_SUMMARY = "summary"; 358 359 /** 360 * Document which is a directory that represents the top directory of 361 * this root. This column is required. 362 * <p> 363 * Type: STRING 364 * 365 * @see Document#COLUMN_DOCUMENT_ID 366 */ 367 public static final String COLUMN_DOCUMENT_ID = "document_id"; 368 369 /** 370 * Number of bytes available in this root. This column is optional, and 371 * may be {@code null} if unknown or unbounded. 372 * <p> 373 * Type: INTEGER (long) 374 */ 375 public static final String COLUMN_AVAILABLE_BYTES = "available_bytes"; 376 377 /** 378 * MIME types supported by this root. This column is optional, and if 379 * {@code null} the root is assumed to support all MIME types. Multiple 380 * MIME types can be separated by a newline. For example, a root 381 * supporting audio might return "audio/*\napplication/x-flac". 382 * <p> 383 * Type: STRING 384 */ 385 public static final String COLUMN_MIME_TYPES = "mime_types"; 386 387 /** {@hide} */ 388 public static final String MIME_TYPE_ITEM = "vnd.android.document/root"; 389 390 /** 391 * Flag indicating that at least one directory under this root supports 392 * creating content. Roots with this flag will be shown when an 393 * application interacts with {@link Intent#ACTION_CREATE_DOCUMENT}. 394 * 395 * @see #COLUMN_FLAGS 396 */ 397 public static final int FLAG_SUPPORTS_CREATE = 1; 398 399 /** 400 * Flag indicating that this root offers content that is strictly local 401 * on the device. That is, no network requests are made for the content. 402 * 403 * @see #COLUMN_FLAGS 404 * @see Intent#EXTRA_LOCAL_ONLY 405 */ 406 public static final int FLAG_LOCAL_ONLY = 1 << 1; 407 408 /** 409 * Flag indicating that this root can be queried to provide recently 410 * modified documents. 411 * 412 * @see #COLUMN_FLAGS 413 * @see DocumentsContract#buildRecentDocumentsUri(String, String) 414 * @see DocumentsProvider#queryRecentDocuments(String, String[]) 415 */ 416 public static final int FLAG_SUPPORTS_RECENTS = 1 << 2; 417 418 /** 419 * Flag indicating that this root supports search. 420 * 421 * @see #COLUMN_FLAGS 422 * @see DocumentsContract#buildSearchDocumentsUri(String, String, 423 * String) 424 * @see DocumentsProvider#querySearchDocuments(String, String, 425 * String[]) 426 */ 427 public static final int FLAG_SUPPORTS_SEARCH = 1 << 3; 428 429 /** 430 * Flag indicating that this root is currently empty. This may be used 431 * to hide the root when opening documents, but the root will still be 432 * shown when creating documents and {@link #FLAG_SUPPORTS_CREATE} is 433 * also set. If the value of this flag changes, such as when a root 434 * becomes non-empty, you must send a content changed notification for 435 * {@link DocumentsContract#buildRootsUri(String)}. 436 * 437 * @see #COLUMN_FLAGS 438 * @see ContentResolver#notifyChange(Uri, 439 * android.database.ContentObserver, boolean) 440 * @hide 441 */ 442 public static final int FLAG_EMPTY = 1 << 16; 443 444 /** 445 * Flag indicating that this root should only be visible to advanced 446 * users. 447 * 448 * @see #COLUMN_FLAGS 449 * @hide 450 */ 451 public static final int FLAG_ADVANCED = 1 << 17; 452 } 453 454 /** 455 * Optional boolean flag included in a directory {@link Cursor#getExtras()} 456 * indicating that a document provider is still loading data. For example, a 457 * provider has returned some results, but is still waiting on an 458 * outstanding network request. The provider must send a content changed 459 * notification when loading is finished. 460 * 461 * @see ContentResolver#notifyChange(Uri, android.database.ContentObserver, 462 * boolean) 463 */ 464 public static final String EXTRA_LOADING = "loading"; 465 466 /** 467 * Optional string included in a directory {@link Cursor#getExtras()} 468 * providing an informational message that should be shown to a user. For 469 * example, a provider may wish to indicate that not all documents are 470 * available. 471 */ 472 public static final String EXTRA_INFO = "info"; 473 474 /** 475 * Optional string included in a directory {@link Cursor#getExtras()} 476 * providing an error message that should be shown to a user. For example, a 477 * provider may wish to indicate that a network error occurred. The user may 478 * choose to retry, resulting in a new query. 479 */ 480 public static final String EXTRA_ERROR = "error"; 481 482 /** {@hide} */ 483 public static final String METHOD_CREATE_DOCUMENT = "android:createDocument"; 484 /** {@hide} */ 485 public static final String METHOD_DELETE_DOCUMENT = "android:deleteDocument"; 486 487 /** {@hide} */ 488 public static final String EXTRA_THUMBNAIL_SIZE = "thumbnail_size"; 489 490 private static final String PATH_ROOT = "root"; 491 private static final String PATH_RECENT = "recent"; 492 private static final String PATH_DOCUMENT = "document"; 493 private static final String PATH_CHILDREN = "children"; 494 private static final String PATH_SEARCH = "search"; 495 496 private static final String PARAM_QUERY = "query"; 497 private static final String PARAM_MANAGE = "manage"; 498 499 /** 500 * Build URI representing the roots of a document provider. When queried, a 501 * provider will return one or more rows with columns defined by 502 * {@link Root}. 503 * 504 * @see DocumentsProvider#queryRoots(String[]) 505 */ 506 public static Uri buildRootsUri(String authority) { 507 return new Uri.Builder().scheme(ContentResolver.SCHEME_CONTENT) 508 .authority(authority).appendPath(PATH_ROOT).build(); 509 } 510 511 /** 512 * Build URI representing the given {@link Root#COLUMN_ROOT_ID} in a 513 * document provider. 514 * 515 * @see #getRootId(Uri) 516 */ 517 public static Uri buildRootUri(String authority, String rootId) { 518 return new Uri.Builder().scheme(ContentResolver.SCHEME_CONTENT) 519 .authority(authority).appendPath(PATH_ROOT).appendPath(rootId).build(); 520 } 521 522 /** 523 * Build URI representing the recently modified documents of a specific root 524 * in a document provider. When queried, a provider will return zero or more 525 * rows with columns defined by {@link Document}. 526 * 527 * @see DocumentsProvider#queryRecentDocuments(String, String[]) 528 * @see #getRootId(Uri) 529 */ 530 public static Uri buildRecentDocumentsUri(String authority, String rootId) { 531 return new Uri.Builder().scheme(ContentResolver.SCHEME_CONTENT) 532 .authority(authority).appendPath(PATH_ROOT).appendPath(rootId) 533 .appendPath(PATH_RECENT).build(); 534 } 535 536 /** 537 * Build URI representing the given {@link Document#COLUMN_DOCUMENT_ID} in a 538 * document provider. When queried, a provider will return a single row with 539 * columns defined by {@link Document}. 540 * 541 * @see DocumentsProvider#queryDocument(String, String[]) 542 * @see #getDocumentId(Uri) 543 */ 544 public static Uri buildDocumentUri(String authority, String documentId) { 545 return new Uri.Builder().scheme(ContentResolver.SCHEME_CONTENT) 546 .authority(authority).appendPath(PATH_DOCUMENT).appendPath(documentId).build(); 547 } 548 549 /** 550 * Build URI representing the children of the given directory in a document 551 * provider. When queried, a provider will return zero or more rows with 552 * columns defined by {@link Document}. 553 * 554 * @param parentDocumentId the document to return children for, which must 555 * be a directory with MIME type of 556 * {@link Document#MIME_TYPE_DIR}. 557 * @see DocumentsProvider#queryChildDocuments(String, String[], String) 558 * @see #getDocumentId(Uri) 559 */ 560 public static Uri buildChildDocumentsUri(String authority, String parentDocumentId) { 561 return new Uri.Builder().scheme(ContentResolver.SCHEME_CONTENT).authority(authority) 562 .appendPath(PATH_DOCUMENT).appendPath(parentDocumentId).appendPath(PATH_CHILDREN) 563 .build(); 564 } 565 566 /** 567 * Build URI representing a search for matching documents under a specific 568 * root in a document provider. When queried, a provider will return zero or 569 * more rows with columns defined by {@link Document}. 570 * 571 * @see DocumentsProvider#querySearchDocuments(String, String, String[]) 572 * @see #getRootId(Uri) 573 * @see #getSearchDocumentsQuery(Uri) 574 */ 575 public static Uri buildSearchDocumentsUri( 576 String authority, String rootId, String query) { 577 return new Uri.Builder().scheme(ContentResolver.SCHEME_CONTENT).authority(authority) 578 .appendPath(PATH_ROOT).appendPath(rootId).appendPath(PATH_SEARCH) 579 .appendQueryParameter(PARAM_QUERY, query).build(); 580 } 581 582 /** 583 * Test if the given URI represents a {@link Document} backed by a 584 * {@link DocumentsProvider}. 585 */ 586 public static boolean isDocumentUri(Context context, Uri uri) { 587 final List<String> paths = uri.getPathSegments(); 588 if (paths.size() < 2) { 589 return false; 590 } 591 if (!PATH_DOCUMENT.equals(paths.get(0))) { 592 return false; 593 } 594 595 final Intent intent = new Intent(PROVIDER_INTERFACE); 596 final List<ResolveInfo> infos = context.getPackageManager() 597 .queryIntentContentProviders(intent, 0); 598 for (ResolveInfo info : infos) { 599 if (uri.getAuthority().equals(info.providerInfo.authority)) { 600 return true; 601 } 602 } 603 return false; 604 } 605 606 /** 607 * Extract the {@link Root#COLUMN_ROOT_ID} from the given URI. 608 */ 609 public static String getRootId(Uri rootUri) { 610 final List<String> paths = rootUri.getPathSegments(); 611 if (paths.size() < 2) { 612 throw new IllegalArgumentException("Not a root: " + rootUri); 613 } 614 if (!PATH_ROOT.equals(paths.get(0))) { 615 throw new IllegalArgumentException("Not a root: " + rootUri); 616 } 617 return paths.get(1); 618 } 619 620 /** 621 * Extract the {@link Document#COLUMN_DOCUMENT_ID} from the given URI. 622 */ 623 public static String getDocumentId(Uri documentUri) { 624 final List<String> paths = documentUri.getPathSegments(); 625 if (paths.size() < 2) { 626 throw new IllegalArgumentException("Not a document: " + documentUri); 627 } 628 if (!PATH_DOCUMENT.equals(paths.get(0))) { 629 throw new IllegalArgumentException("Not a document: " + documentUri); 630 } 631 return paths.get(1); 632 } 633 634 /** 635 * Extract the search query from a URI built by 636 * {@link #buildSearchDocumentsUri(String, String, String)}. 637 */ 638 public static String getSearchDocumentsQuery(Uri searchDocumentsUri) { 639 return searchDocumentsUri.getQueryParameter(PARAM_QUERY); 640 } 641 642 /** {@hide} */ 643 public static Uri setManageMode(Uri uri) { 644 return uri.buildUpon().appendQueryParameter(PARAM_MANAGE, "true").build(); 645 } 646 647 /** {@hide} */ 648 public static boolean isManageMode(Uri uri) { 649 return uri.getBooleanQueryParameter(PARAM_MANAGE, false); 650 } 651 652 /** 653 * Return thumbnail representing the document at the given URI. Callers are 654 * responsible for their own in-memory caching. 655 * 656 * @param documentUri document to return thumbnail for, which must have 657 * {@link Document#FLAG_SUPPORTS_THUMBNAIL} set. 658 * @param size optimal thumbnail size desired. A provider may return a 659 * thumbnail of a different size, but never more than double the 660 * requested size. 661 * @param signal signal used to indicate if caller is no longer interested 662 * in the thumbnail. 663 * @return decoded thumbnail, or {@code null} if problem was encountered. 664 * @see DocumentsProvider#openDocumentThumbnail(String, Point, 665 * android.os.CancellationSignal) 666 */ 667 public static Bitmap getDocumentThumbnail( 668 ContentResolver resolver, Uri documentUri, Point size, CancellationSignal signal) { 669 final ContentProviderClient client = resolver.acquireUnstableContentProviderClient( 670 documentUri.getAuthority()); 671 try { 672 return getDocumentThumbnail(client, documentUri, size, signal); 673 } catch (Exception e) { 674 if (!(e instanceof OperationCanceledException)) { 675 Log.w(TAG, "Failed to load thumbnail for " + documentUri + ": " + e); 676 } 677 return null; 678 } finally { 679 ContentProviderClient.releaseQuietly(client); 680 } 681 } 682 683 /** {@hide} */ 684 public static Bitmap getDocumentThumbnail( 685 ContentProviderClient client, Uri documentUri, Point size, CancellationSignal signal) 686 throws RemoteException, IOException { 687 final Bundle openOpts = new Bundle(); 688 openOpts.putParcelable(DocumentsContract.EXTRA_THUMBNAIL_SIZE, size); 689 690 AssetFileDescriptor afd = null; 691 Bitmap bitmap = null; 692 try { 693 afd = client.openTypedAssetFileDescriptor(documentUri, "image/*", openOpts, signal); 694 695 final FileDescriptor fd = afd.getFileDescriptor(); 696 final long offset = afd.getStartOffset(); 697 698 // Try seeking on the returned FD, since it gives us the most 699 // optimal decode path; otherwise fall back to buffering. 700 BufferedInputStream is = null; 701 try { 702 Libcore.os.lseek(fd, offset, SEEK_SET); 703 } catch (ErrnoException e) { 704 is = new BufferedInputStream(new FileInputStream(fd), THUMBNAIL_BUFFER_SIZE); 705 is.mark(THUMBNAIL_BUFFER_SIZE); 706 } 707 708 // We requested a rough thumbnail size, but the remote size may have 709 // returned something giant, so defensively scale down as needed. 710 final BitmapFactory.Options opts = new BitmapFactory.Options(); 711 opts.inJustDecodeBounds = true; 712 if (is != null) { 713 BitmapFactory.decodeStream(is, null, opts); 714 } else { 715 BitmapFactory.decodeFileDescriptor(fd, null, opts); 716 } 717 718 final int widthSample = opts.outWidth / size.x; 719 final int heightSample = opts.outHeight / size.y; 720 721 opts.inJustDecodeBounds = false; 722 opts.inSampleSize = Math.min(widthSample, heightSample); 723 if (is != null) { 724 is.reset(); 725 bitmap = BitmapFactory.decodeStream(is, null, opts); 726 } else { 727 try { 728 Libcore.os.lseek(fd, offset, SEEK_SET); 729 } catch (ErrnoException e) { 730 e.rethrowAsIOException(); 731 } 732 bitmap = BitmapFactory.decodeFileDescriptor(fd, null, opts); 733 } 734 735 // Transform the bitmap if requested. We use a side-channel to 736 // communicate the orientation, since EXIF thumbnails don't contain 737 // the rotation flags of the original image. 738 final Bundle extras = afd.getExtras(); 739 final int orientation = (extras != null) ? extras.getInt(EXTRA_ORIENTATION, 0) : 0; 740 if (orientation != 0) { 741 final int width = bitmap.getWidth(); 742 final int height = bitmap.getHeight(); 743 744 final Matrix m = new Matrix(); 745 m.setRotate(orientation, width / 2, height / 2); 746 bitmap = Bitmap.createBitmap(bitmap, 0, 0, width, height, m, false); 747 } 748 } finally { 749 IoUtils.closeQuietly(afd); 750 } 751 752 return bitmap; 753 } 754 755 /** 756 * Create a new document with given MIME type and display name. 757 * 758 * @param parentDocumentUri directory with 759 * {@link Document#FLAG_DIR_SUPPORTS_CREATE} 760 * @param mimeType MIME type of new document 761 * @param displayName name of new document 762 * @return newly created document, or {@code null} if failed 763 * @hide 764 */ 765 public static Uri createDocument(ContentResolver resolver, Uri parentDocumentUri, 766 String mimeType, String displayName) { 767 final ContentProviderClient client = resolver.acquireUnstableContentProviderClient( 768 parentDocumentUri.getAuthority()); 769 try { 770 return createDocument(client, parentDocumentUri, mimeType, displayName); 771 } catch (Exception e) { 772 Log.w(TAG, "Failed to create document", e); 773 return null; 774 } finally { 775 ContentProviderClient.releaseQuietly(client); 776 } 777 } 778 779 /** {@hide} */ 780 public static Uri createDocument(ContentProviderClient client, Uri parentDocumentUri, 781 String mimeType, String displayName) throws RemoteException { 782 final Bundle in = new Bundle(); 783 in.putString(Document.COLUMN_DOCUMENT_ID, getDocumentId(parentDocumentUri)); 784 in.putString(Document.COLUMN_MIME_TYPE, mimeType); 785 in.putString(Document.COLUMN_DISPLAY_NAME, displayName); 786 787 final Bundle out = client.call(METHOD_CREATE_DOCUMENT, null, in); 788 return buildDocumentUri( 789 parentDocumentUri.getAuthority(), out.getString(Document.COLUMN_DOCUMENT_ID)); 790 } 791 792 /** 793 * Delete the given document. 794 * 795 * @param documentUri document with {@link Document#FLAG_SUPPORTS_DELETE} 796 * @return if the document was deleted successfully. 797 */ 798 public static boolean deleteDocument(ContentResolver resolver, Uri documentUri) { 799 final ContentProviderClient client = resolver.acquireUnstableContentProviderClient( 800 documentUri.getAuthority()); 801 try { 802 deleteDocument(client, documentUri); 803 return true; 804 } catch (Exception e) { 805 Log.w(TAG, "Failed to delete document", e); 806 return false; 807 } finally { 808 ContentProviderClient.releaseQuietly(client); 809 } 810 } 811 812 /** {@hide} */ 813 public static void deleteDocument(ContentProviderClient client, Uri documentUri) 814 throws RemoteException { 815 final Bundle in = new Bundle(); 816 in.putString(Document.COLUMN_DOCUMENT_ID, getDocumentId(documentUri)); 817 818 client.call(METHOD_DELETE_DOCUMENT, null, in); 819 } 820 821 /** 822 * Open the given image for thumbnail purposes, using any embedded EXIF 823 * thumbnail if available, and providing orientation hints from the parent 824 * image. 825 * 826 * @hide 827 */ 828 public static AssetFileDescriptor openImageThumbnail(File file) throws FileNotFoundException { 829 final ParcelFileDescriptor pfd = ParcelFileDescriptor.open( 830 file, ParcelFileDescriptor.MODE_READ_ONLY); 831 Bundle extras = null; 832 833 try { 834 final ExifInterface exif = new ExifInterface(file.getAbsolutePath()); 835 836 switch (exif.getAttributeInt(ExifInterface.TAG_ORIENTATION, -1)) { 837 case ExifInterface.ORIENTATION_ROTATE_90: 838 extras = new Bundle(1); 839 extras.putInt(EXTRA_ORIENTATION, 90); 840 break; 841 case ExifInterface.ORIENTATION_ROTATE_180: 842 extras = new Bundle(1); 843 extras.putInt(EXTRA_ORIENTATION, 180); 844 break; 845 case ExifInterface.ORIENTATION_ROTATE_270: 846 extras = new Bundle(1); 847 extras.putInt(EXTRA_ORIENTATION, 270); 848 break; 849 } 850 851 final long[] thumb = exif.getThumbnailRange(); 852 if (thumb != null) { 853 return new AssetFileDescriptor(pfd, thumb[0], thumb[1], extras); 854 } 855 } catch (IOException e) { 856 } 857 858 return new AssetFileDescriptor(pfd, 0, AssetFileDescriptor.UNKNOWN_LENGTH, extras); 859 } 860 } 861
