| /* |
| * Copyright (C) 2013 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package android.provider; |
| |
| import static android.net.TrafficStats.KB_IN_BYTES; |
| import static libcore.io.OsConstants.SEEK_SET; |
| |
| import android.content.ContentProviderClient; |
| import android.content.ContentResolver; |
| import android.content.Intent; |
| import android.content.res.AssetFileDescriptor; |
| import android.database.Cursor; |
| import android.graphics.Bitmap; |
| import android.graphics.BitmapFactory; |
| import android.graphics.Point; |
| import android.net.Uri; |
| import android.os.Bundle; |
| import android.os.CancellationSignal; |
| import android.os.ParcelFileDescriptor; |
| import android.os.ParcelFileDescriptor.OnCloseListener; |
| import android.os.RemoteException; |
| import android.util.Log; |
| |
| import libcore.io.ErrnoException; |
| import libcore.io.IoUtils; |
| import libcore.io.Libcore; |
| |
| import java.io.BufferedInputStream; |
| import java.io.FileDescriptor; |
| import java.io.FileInputStream; |
| import java.io.IOException; |
| import java.util.List; |
| |
| /** |
| * Defines the contract between a documents provider and the platform. |
| * <p> |
| * To create a document provider, extend {@link DocumentsProvider}, which |
| * provides a foundational implementation of this contract. |
| * |
| * @see DocumentsProvider |
| */ |
| public final class DocumentsContract { |
| private static final String TAG = "Documents"; |
| |
| // content://com.example/root/ |
| // content://com.example/root/sdcard/ |
| // content://com.example/root/sdcard/recent/ |
| // content://com.example/root/sdcard/search/?query=pony |
| // content://com.example/document/12/ |
| // content://com.example/document/12/children/ |
| |
| private DocumentsContract() { |
| } |
| |
| /** {@hide} */ |
| public static final String META_DATA_DOCUMENT_PROVIDER = "android.content.DOCUMENT_PROVIDER"; |
| |
| /** {@hide} */ |
| public static final String ACTION_MANAGE_ROOT = "android.provider.action.MANAGE_ROOT"; |
| /** {@hide} */ |
| public static final String ACTION_MANAGE_DOCUMENT = "android.provider.action.MANAGE_DOCUMENT"; |
| |
| /** |
| * Buffer is large enough to rewind past any EXIF headers. |
| */ |
| private static final int THUMBNAIL_BUFFER_SIZE = (int) (128 * KB_IN_BYTES); |
| |
| /** |
| * Constants related to a document, including {@link Cursor} columns names |
| * and flags. |
| * <p> |
| * A document can be either an openable file (with a specific MIME type), or |
| * a directory containing additional documents (with the |
| * {@link #MIME_TYPE_DIR} MIME type). |
| * <p> |
| * All columns are <em>read-only</em> to client applications. |
| */ |
| public final static class Document { |
| private Document() { |
| } |
| |
| /** |
| * Unique ID of a document. This ID is both provided by and interpreted |
| * by a {@link DocumentsProvider}, and should be treated as an opaque |
| * value by client applications. |
| * <p> |
| * Each document must have a unique ID within a provider, but that |
| * single document may be included as a child of multiple directories. |
| * <p> |
| * A provider must always return durable IDs, since they will be used to |
| * issue long-term Uri permission grants when an application interacts |
| * with {@link Intent#ACTION_OPEN_DOCUMENT} and |
| * {@link Intent#ACTION_CREATE_DOCUMENT}. |
| * <p> |
| * Type: STRING |
| */ |
| public static final String COLUMN_DOCUMENT_ID = "document_id"; |
| |
| /** |
| * Concrete MIME type of a document. For example, "image/png" or |
| * "application/pdf" for openable files. A document can also be a |
| * directory containing additional documents, which is represented with |
| * the {@link #MIME_TYPE_DIR} MIME type. |
| * <p> |
| * Type: STRING |
| * |
| * @see #MIME_TYPE_DIR |
| */ |
| public static final String COLUMN_MIME_TYPE = "mime_type"; |
| |
| /** |
| * Display name of a document, used as the primary title displayed to a |
| * user. |
| * <p> |
| * Type: STRING |
| */ |
| public static final String COLUMN_DISPLAY_NAME = OpenableColumns.DISPLAY_NAME; |
| |
| /** |
| * Summary of a document, which may be shown to a user. The summary may |
| * be {@code null}. |
| * <p> |
| * Type: STRING |
| */ |
| public static final String COLUMN_SUMMARY = "summary"; |
| |
| /** |
| * Timestamp when a document was last modified, in milliseconds since |
| * January 1, 1970 00:00:00.0 UTC, or {@code null} if unknown. A |
| * {@link DocumentsProvider} can update this field using events from |
| * {@link OnCloseListener} or other reliable |
| * {@link ParcelFileDescriptor} transports. |
| * <p> |
| * Type: INTEGER (long) |
| * |
| * @see System#currentTimeMillis() |
| */ |
| public static final String COLUMN_LAST_MODIFIED = "last_modified"; |
| |
| /** |
| * Specific icon resource ID for a document, or {@code null} to use |
| * platform default icon based on {@link #COLUMN_MIME_TYPE}. |
| * <p> |
| * Type: INTEGER (int) |
| */ |
| public static final String COLUMN_ICON = "icon"; |
| |
| /** |
| * Flags that apply to a document. |
| * <p> |
| * Type: INTEGER (int) |
| * |
| * @see #FLAG_SUPPORTS_WRITE |
| * @see #FLAG_SUPPORTS_DELETE |
| * @see #FLAG_SUPPORTS_THUMBNAIL |
| * @see #FLAG_DIR_PREFERS_GRID |
| * @see #FLAG_DIR_SUPPORTS_CREATE |
| */ |
| public static final String COLUMN_FLAGS = "flags"; |
| |
| /** |
| * Size of a document, in bytes, or {@code null} if unknown. |
| * <p> |
| * Type: INTEGER (long) |
| */ |
| public static final String COLUMN_SIZE = OpenableColumns.SIZE; |
| |
| /** |
| * MIME type of a document which is a directory that may contain |
| * additional documents. |
| * |
| * @see #COLUMN_MIME_TYPE |
| */ |
| public static final String MIME_TYPE_DIR = "vnd.android.document/directory"; |
| |
| /** |
| * Flag indicating that a document can be represented as a thumbnail. |
| * |
| * @see #COLUMN_FLAGS |
| * @see DocumentsContract#getDocumentThumbnail(ContentResolver, Uri, |
| * Point, CancellationSignal) |
| * @see DocumentsProvider#openDocumentThumbnail(String, Point, |
| * android.os.CancellationSignal) |
| */ |
| public static final int FLAG_SUPPORTS_THUMBNAIL = 1; |
| |
| /** |
| * Flag indicating that a document supports writing. |
| * <p> |
| * When a document is opened with {@link Intent#ACTION_OPEN_DOCUMENT}, |
| * the calling application is granted both |
| * {@link Intent#FLAG_GRANT_READ_URI_PERMISSION} and |
| * {@link Intent#FLAG_GRANT_WRITE_URI_PERMISSION}. However, the actual |
| * writability of a document may change over time, for example due to |
| * remote access changes. This flag indicates that a document client can |
| * expect {@link ContentResolver#openOutputStream(Uri)} to succeed. |
| * |
| * @see #COLUMN_FLAGS |
| */ |
| public static final int FLAG_SUPPORTS_WRITE = 1 << 1; |
| |
| /** |
| * Flag indicating that a document is deletable. |
| * |
| * @see #COLUMN_FLAGS |
| * @see DocumentsContract#deleteDocument(ContentResolver, Uri) |
| * @see DocumentsProvider#deleteDocument(String) |
| */ |
| public static final int FLAG_SUPPORTS_DELETE = 1 << 2; |
| |
| /** |
| * Flag indicating that a document is a directory that supports creation |
| * of new files within it. Only valid when {@link #COLUMN_MIME_TYPE} is |
| * {@link #MIME_TYPE_DIR}. |
| * |
| * @see #COLUMN_FLAGS |
| * @see DocumentsContract#createDocument(ContentResolver, Uri, String, |
| * String) |
| * @see DocumentsProvider#createDocument(String, String, String) |
| */ |
| public static final int FLAG_DIR_SUPPORTS_CREATE = 1 << 3; |
| |
| /** |
| * Flag indicating that a directory prefers its contents be shown in a |
| * larger format grid. Usually suitable when a directory contains mostly |
| * pictures. Only valid when {@link #COLUMN_MIME_TYPE} is |
| * {@link #MIME_TYPE_DIR}. |
| * |
| * @see #COLUMN_FLAGS |
| */ |
| public static final int FLAG_DIR_PREFERS_GRID = 1 << 4; |
| |
| /** |
| * Flag indicating that a directory prefers its contents be sorted by |
| * {@link #COLUMN_LAST_MODIFIED}. Only valid when |
| * {@link #COLUMN_MIME_TYPE} is {@link #MIME_TYPE_DIR}. |
| * |
| * @see #COLUMN_FLAGS |
| */ |
| public static final int FLAG_DIR_PREFERS_LAST_MODIFIED = 1 << 5; |
| |
| /** |
| * Flag indicating that document titles should be hidden when viewing |
| * this directory in a larger format grid. For example, a directory |
| * containing only images may want the image thumbnails to speak for |
| * themselves. Only valid when {@link #COLUMN_MIME_TYPE} is |
| * {@link #MIME_TYPE_DIR}. |
| * |
| * @see #COLUMN_FLAGS |
| * @see #FLAG_DIR_PREFERS_GRID |
| */ |
| public static final int FLAG_DIR_HIDE_GRID_TITLES = 1 << 6; |
| } |
| |
| /** |
| * Constants related to a root of documents, including {@link Cursor} |
| * columns names and flags. |
| * <p> |
| * All columns are <em>read-only</em> to client applications. |
| */ |
| public final static class Root { |
| private Root() { |
| } |
| |
| /** |
| * Unique ID of a root. This ID is both provided by and interpreted by a |
| * {@link DocumentsProvider}, and should be treated as an opaque value |
| * by client applications. |
| * <p> |
| * Type: STRING |
| */ |
| public static final String COLUMN_ROOT_ID = "root_id"; |
| |
| /** |
| * Type of a root, used for clustering when presenting multiple roots to |
| * a user. |
| * <p> |
| * Type: INTEGER (int) |
| * |
| * @see #ROOT_TYPE_SERVICE |
| * @see #ROOT_TYPE_SHORTCUT |
| * @see #ROOT_TYPE_DEVICE |
| */ |
| public static final String COLUMN_ROOT_TYPE = "root_type"; |
| |
| /** |
| * Flags that apply to a root. |
| * <p> |
| * Type: INTEGER (int) |
| * |
| * @see #FLAG_ADVANCED |
| * @see #FLAG_EMPTY |
| * @see #FLAG_LOCAL_ONLY |
| * @see #FLAG_SUPPORTS_CREATE |
| * @see #FLAG_SUPPORTS_RECENTS |
| * @see #FLAG_SUPPORTS_SEARCH |
| */ |
| public static final String COLUMN_FLAGS = "flags"; |
| |
| /** |
| * Icon resource ID for a root. |
| * <p> |
| * Type: INTEGER (int) |
| */ |
| public static final String COLUMN_ICON = "icon"; |
| |
| /** |
| * Title for a root, which will be shown to a user. |
| * <p> |
| * Type: STRING |
| */ |
| public static final String COLUMN_TITLE = "title"; |
| |
| /** |
| * Summary for this root, which may be shown to a user. The summary may |
| * be {@code null}. |
| * <p> |
| * Type: STRING |
| */ |
| public static final String COLUMN_SUMMARY = "summary"; |
| |
| /** |
| * Document which is a directory that represents the top directory of |
| * this root. |
| * <p> |
| * Type: STRING |
| * |
| * @see Document#COLUMN_DOCUMENT_ID |
| */ |
| public static final String COLUMN_DOCUMENT_ID = "document_id"; |
| |
| /** |
| * Number of bytes available in this root, or {@code null} if unknown or |
| * unbounded. |
| * <p> |
| * Type: INTEGER (long) |
| */ |
| public static final String COLUMN_AVAILABLE_BYTES = "available_bytes"; |
| |
| /** |
| * MIME types supported by this root, or {@code null} if the root |
| * supports all MIME types. Multiple MIME types can be separated by a |
| * newline. For example, a root supporting audio might use |
| * "audio/*\napplication/x-flac". |
| * <p> |
| * Type: String |
| */ |
| public static final String COLUMN_MIME_TYPES = "mime_types"; |
| |
| /** {@hide} */ |
| public static final String MIME_TYPE_ITEM = "vnd.android.document/root"; |
| |
| /** |
| * Type of root that represents a storage service, such as a cloud-based |
| * service. |
| * |
| * @see #COLUMN_ROOT_TYPE |
| */ |
| public static final int ROOT_TYPE_SERVICE = 1; |
| |
| /** |
| * Type of root that represents a shortcut to content that may be |
| * available elsewhere through another storage root. |
| * |
| * @see #COLUMN_ROOT_TYPE |
| */ |
| public static final int ROOT_TYPE_SHORTCUT = 2; |
| |
| /** |
| * Type of root that represents a physical storage device. |
| * |
| * @see #COLUMN_ROOT_TYPE |
| */ |
| public static final int ROOT_TYPE_DEVICE = 3; |
| |
| /** |
| * Flag indicating that at least one directory under this root supports |
| * creating content. Roots with this flag will be shown when an |
| * application interacts with {@link Intent#ACTION_CREATE_DOCUMENT}. |
| * |
| * @see #COLUMN_FLAGS |
| */ |
| public static final int FLAG_SUPPORTS_CREATE = 1; |
| |
| /** |
| * Flag indicating that this root offers content that is strictly local |
| * on the device. That is, no network requests are made for the content. |
| * |
| * @see #COLUMN_FLAGS |
| * @see Intent#EXTRA_LOCAL_ONLY |
| */ |
| public static final int FLAG_LOCAL_ONLY = 1 << 1; |
| |
| /** |
| * Flag indicating that this root should only be visible to advanced |
| * users. |
| * |
| * @see #COLUMN_FLAGS |
| */ |
| public static final int FLAG_ADVANCED = 1 << 2; |
| |
| /** |
| * Flag indicating that this root can report recently modified |
| * documents. |
| * |
| * @see #COLUMN_FLAGS |
| * @see DocumentsContract#buildRecentDocumentsUri(String, String) |
| */ |
| public static final int FLAG_SUPPORTS_RECENTS = 1 << 3; |
| |
| /** |
| * Flag indicating that this root supports search. |
| * |
| * @see #COLUMN_FLAGS |
| * @see DocumentsProvider#querySearchDocuments(String, String, |
| * String[]) |
| */ |
| public static final int FLAG_SUPPORTS_SEARCH = 1 << 4; |
| |
| /** |
| * Flag indicating that this root is currently empty. This may be used |
| * to hide the root when opening documents, but the root will still be |
| * shown when creating documents and {@link #FLAG_SUPPORTS_CREATE} is |
| * also set. |
| * |
| * @see #COLUMN_FLAGS |
| * @see DocumentsProvider#querySearchDocuments(String, String, |
| * String[]) |
| */ |
| public static final int FLAG_EMPTY = 1 << 5; |
| } |
| |
| /** |
| * Optional boolean flag included in a directory {@link Cursor#getExtras()} |
| * indicating that a document provider is still loading data. For example, a |
| * provider has returned some results, but is still waiting on an |
| * outstanding network request. The provider must send a content changed |
| * notification when loading is finished. |
| * |
| * @see ContentResolver#notifyChange(Uri, android.database.ContentObserver, |
| * boolean) |
| */ |
| public static final String EXTRA_LOADING = "loading"; |
| |
| /** |
| * Optional string included in a directory {@link Cursor#getExtras()} |
| * providing an informational message that should be shown to a user. For |
| * example, a provider may wish to indicate that not all documents are |
| * available. |
| */ |
| public static final String EXTRA_INFO = "info"; |
| |
| /** |
| * Optional string included in a directory {@link Cursor#getExtras()} |
| * providing an error message that should be shown to a user. For example, a |
| * provider may wish to indicate that a network error occurred. The user may |
| * choose to retry, resulting in a new query. |
| */ |
| public static final String EXTRA_ERROR = "error"; |
| |
| /** {@hide} */ |
| public static final String METHOD_CREATE_DOCUMENT = "android:createDocument"; |
| /** {@hide} */ |
| public static final String METHOD_DELETE_DOCUMENT = "android:deleteDocument"; |
| |
| /** {@hide} */ |
| public static final String EXTRA_THUMBNAIL_SIZE = "thumbnail_size"; |
| |
| private static final String PATH_ROOT = "root"; |
| private static final String PATH_RECENT = "recent"; |
| private static final String PATH_DOCUMENT = "document"; |
| private static final String PATH_CHILDREN = "children"; |
| private static final String PATH_SEARCH = "search"; |
| |
| private static final String PARAM_QUERY = "query"; |
| private static final String PARAM_MANAGE = "manage"; |
| |
| /** |
| * Build Uri representing the roots of a document provider. When queried, a |
| * provider will return one or more rows with columns defined by |
| * {@link Root}. |
| * |
| * @see DocumentsProvider#queryRoots(String[]) |
| */ |
| public static Uri buildRootsUri(String authority) { |
| return new Uri.Builder().scheme(ContentResolver.SCHEME_CONTENT) |
| .authority(authority).appendPath(PATH_ROOT).build(); |
| } |
| |
| /** |
| * Build Uri representing the given {@link Root#COLUMN_ROOT_ID} in a |
| * document provider. |
| * |
| * @see #getRootId(Uri) |
| */ |
| public static Uri buildRootUri(String authority, String rootId) { |
| return new Uri.Builder().scheme(ContentResolver.SCHEME_CONTENT) |
| .authority(authority).appendPath(PATH_ROOT).appendPath(rootId).build(); |
| } |
| |
| /** |
| * Build Uri representing the recently modified documents of a specific root |
| * in a document provider. When queried, a provider will return zero or more |
| * rows with columns defined by {@link Document}. |
| * |
| * @see DocumentsProvider#queryRecentDocuments(String, String[]) |
| * @see #getRootId(Uri) |
| */ |
| public static Uri buildRecentDocumentsUri(String authority, String rootId) { |
| return new Uri.Builder().scheme(ContentResolver.SCHEME_CONTENT) |
| .authority(authority).appendPath(PATH_ROOT).appendPath(rootId) |
| .appendPath(PATH_RECENT).build(); |
| } |
| |
| /** |
| * Build Uri representing the given {@link Document#COLUMN_DOCUMENT_ID} in a |
| * document provider. When queried, a provider will return a single row with |
| * columns defined by {@link Document}. |
| * |
| * @see DocumentsProvider#queryDocument(String, String[]) |
| * @see #getDocumentId(Uri) |
| */ |
| public static Uri buildDocumentUri(String authority, String documentId) { |
| return new Uri.Builder().scheme(ContentResolver.SCHEME_CONTENT) |
| .authority(authority).appendPath(PATH_DOCUMENT).appendPath(documentId).build(); |
| } |
| |
| /** |
| * Build Uri representing the children of the given directory in a document |
| * provider. When queried, a provider will return zero or more rows with |
| * columns defined by {@link Document}. |
| * |
| * @param parentDocumentId the document to return children for, which must |
| * be a directory with MIME type of |
| * {@link Document#MIME_TYPE_DIR}. |
| * @see DocumentsProvider#queryChildDocuments(String, String[], String) |
| * @see #getDocumentId(Uri) |
| */ |
| public static Uri buildChildDocumentsUri(String authority, String parentDocumentId) { |
| return new Uri.Builder().scheme(ContentResolver.SCHEME_CONTENT).authority(authority) |
| .appendPath(PATH_DOCUMENT).appendPath(parentDocumentId).appendPath(PATH_CHILDREN) |
| .build(); |
| } |
| |
| /** |
| * Build Uri representing a search for matching documents under a specific |
| * root in a document provider. When queried, a provider will return zero or |
| * more rows with columns defined by {@link Document}. |
| * |
| * @see DocumentsProvider#querySearchDocuments(String, String, String[]) |
| * @see #getRootId(Uri) |
| * @see #getSearchDocumentsQuery(Uri) |
| */ |
| public static Uri buildSearchDocumentsUri( |
| String authority, String rootId, String query) { |
| return new Uri.Builder().scheme(ContentResolver.SCHEME_CONTENT).authority(authority) |
| .appendPath(PATH_ROOT).appendPath(rootId).appendPath(PATH_SEARCH) |
| .appendQueryParameter(PARAM_QUERY, query).build(); |
| } |
| |
| /** |
| * Extract the {@link Root#COLUMN_ROOT_ID} from the given Uri. |
| */ |
| public static String getRootId(Uri rootUri) { |
| final List<String> paths = rootUri.getPathSegments(); |
| if (paths.size() < 2) { |
| throw new IllegalArgumentException("Not a root: " + rootUri); |
| } |
| if (!PATH_ROOT.equals(paths.get(0))) { |
| throw new IllegalArgumentException("Not a root: " + rootUri); |
| } |
| return paths.get(1); |
| } |
| |
| /** |
| * Extract the {@link Document#COLUMN_DOCUMENT_ID} from the given Uri. |
| */ |
| public static String getDocumentId(Uri documentUri) { |
| final List<String> paths = documentUri.getPathSegments(); |
| if (paths.size() < 2) { |
| throw new IllegalArgumentException("Not a document: " + documentUri); |
| } |
| if (!PATH_DOCUMENT.equals(paths.get(0))) { |
| throw new IllegalArgumentException("Not a document: " + documentUri); |
| } |
| return paths.get(1); |
| } |
| |
| /** |
| * Extract the search query from a Uri built by |
| * {@link #buildSearchDocumentsUri(String, String, String)}. |
| */ |
| public static String getSearchDocumentsQuery(Uri searchDocumentsUri) { |
| return searchDocumentsUri.getQueryParameter(PARAM_QUERY); |
| } |
| |
| /** {@hide} */ |
| public static Uri setManageMode(Uri uri) { |
| return uri.buildUpon().appendQueryParameter(PARAM_MANAGE, "true").build(); |
| } |
| |
| /** {@hide} */ |
| public static boolean isManageMode(Uri uri) { |
| return uri.getBooleanQueryParameter(PARAM_MANAGE, false); |
| } |
| |
| /** |
| * Return thumbnail representing the document at the given Uri. Callers are |
| * responsible for their own in-memory caching. |
| * |
| * @param documentUri document to return thumbnail for, which must have |
| * {@link Document#FLAG_SUPPORTS_THUMBNAIL} set. |
| * @param size optimal thumbnail size desired. A provider may return a |
| * thumbnail of a different size, but never more than double the |
| * requested size. |
| * @param signal signal used to indicate that caller is no longer interested |
| * in the thumbnail. |
| * @return decoded thumbnail, or {@code null} if problem was encountered. |
| * @see DocumentsProvider#openDocumentThumbnail(String, Point, |
| * android.os.CancellationSignal) |
| */ |
| public static Bitmap getDocumentThumbnail( |
| ContentResolver resolver, Uri documentUri, Point size, CancellationSignal signal) { |
| final ContentProviderClient client = resolver.acquireUnstableContentProviderClient( |
| documentUri.getAuthority()); |
| try { |
| return getDocumentThumbnail(client, documentUri, size, signal); |
| } catch (RemoteException e) { |
| return null; |
| } finally { |
| ContentProviderClient.closeQuietly(client); |
| } |
| } |
| |
| /** {@hide} */ |
| public static Bitmap getDocumentThumbnail( |
| ContentProviderClient client, Uri documentUri, Point size, CancellationSignal signal) |
| throws RemoteException { |
| final Bundle openOpts = new Bundle(); |
| openOpts.putParcelable(DocumentsContract.EXTRA_THUMBNAIL_SIZE, size); |
| |
| AssetFileDescriptor afd = null; |
| try { |
| afd = client.openTypedAssetFileDescriptor(documentUri, "image/*", openOpts, signal); |
| |
| final FileDescriptor fd = afd.getFileDescriptor(); |
| final long offset = afd.getStartOffset(); |
| |
| // Try seeking on the returned FD, since it gives us the most |
| // optimal decode path; otherwise fall back to buffering. |
| BufferedInputStream is = null; |
| try { |
| Libcore.os.lseek(fd, offset, SEEK_SET); |
| } catch (ErrnoException e) { |
| is = new BufferedInputStream(new FileInputStream(fd), THUMBNAIL_BUFFER_SIZE); |
| is.mark(THUMBNAIL_BUFFER_SIZE); |
| } |
| |
| // We requested a rough thumbnail size, but the remote size may have |
| // returned something giant, so defensively scale down as needed. |
| final BitmapFactory.Options opts = new BitmapFactory.Options(); |
| opts.inJustDecodeBounds = true; |
| if (is != null) { |
| BitmapFactory.decodeStream(is, null, opts); |
| } else { |
| BitmapFactory.decodeFileDescriptor(fd, null, opts); |
| } |
| |
| final int widthSample = opts.outWidth / size.x; |
| final int heightSample = opts.outHeight / size.y; |
| |
| opts.inJustDecodeBounds = false; |
| opts.inSampleSize = Math.min(widthSample, heightSample); |
| Log.d(TAG, "Decoding with sample size " + opts.inSampleSize); |
| if (is != null) { |
| is.reset(); |
| return BitmapFactory.decodeStream(is, null, opts); |
| } else { |
| try { |
| Libcore.os.lseek(fd, offset, SEEK_SET); |
| } catch (ErrnoException e) { |
| e.rethrowAsIOException(); |
| } |
| return BitmapFactory.decodeFileDescriptor(fd, null, opts); |
| } |
| } catch (IOException e) { |
| Log.w(TAG, "Failed to load thumbnail for " + documentUri + ": " + e); |
| return null; |
| } finally { |
| IoUtils.closeQuietly(afd); |
| } |
| } |
| |
| /** |
| * Create a new document with given MIME type and display name. |
| * |
| * @param parentDocumentUri directory with |
| * {@link Document#FLAG_DIR_SUPPORTS_CREATE} |
| * @param mimeType MIME type of new document |
| * @param displayName name of new document |
| * @return newly created document, or {@code null} if failed |
| * @hide |
| */ |
| public static Uri createDocument(ContentResolver resolver, Uri parentDocumentUri, |
| String mimeType, String displayName) { |
| final ContentProviderClient client = resolver.acquireUnstableContentProviderClient( |
| parentDocumentUri.getAuthority()); |
| try { |
| return createDocument(client, parentDocumentUri, mimeType, displayName); |
| } finally { |
| ContentProviderClient.closeQuietly(client); |
| } |
| } |
| |
| /** {@hide} */ |
| public static Uri createDocument(ContentProviderClient client, Uri parentDocumentUri, |
| String mimeType, String displayName) { |
| final Bundle in = new Bundle(); |
| in.putString(Document.COLUMN_DOCUMENT_ID, getDocumentId(parentDocumentUri)); |
| in.putString(Document.COLUMN_MIME_TYPE, mimeType); |
| in.putString(Document.COLUMN_DISPLAY_NAME, displayName); |
| |
| try { |
| final Bundle out = client.call(METHOD_CREATE_DOCUMENT, null, in); |
| return buildDocumentUri( |
| parentDocumentUri.getAuthority(), out.getString(Document.COLUMN_DOCUMENT_ID)); |
| } catch (Exception e) { |
| Log.w(TAG, "Failed to create document", e); |
| return null; |
| } |
| } |
| |
| /** |
| * Delete the given document. |
| * |
| * @param documentUri document with {@link Document#FLAG_SUPPORTS_DELETE} |
| */ |
| public static boolean deleteDocument(ContentResolver resolver, Uri documentUri) { |
| final ContentProviderClient client = resolver.acquireUnstableContentProviderClient( |
| documentUri.getAuthority()); |
| try { |
| return deleteDocument(client, documentUri); |
| } finally { |
| ContentProviderClient.closeQuietly(client); |
| } |
| } |
| |
| /** {@hide} */ |
| public static boolean deleteDocument(ContentProviderClient client, Uri documentUri) { |
| final Bundle in = new Bundle(); |
| in.putString(Document.COLUMN_DOCUMENT_ID, getDocumentId(documentUri)); |
| |
| try { |
| final Bundle out = client.call(METHOD_DELETE_DOCUMENT, null, in); |
| return true; |
| } catch (Exception e) { |
| Log.w(TAG, "Failed to delete document", e); |
| return false; |
| } |
| } |
| } |