本文整理汇总了Java中android.content.res.AssetFileDescriptor.UNKNOWN_LENGTH属性的典型用法代码示例。如果您正苦于以下问题:Java AssetFileDescriptor.UNKNOWN_LENGTH属性的具体用法?Java AssetFileDescriptor.UNKNOWN_LENGTH怎么用?Java AssetFileDescriptor.UNKNOWN_LENGTH使用的例子?那么, 这里精选的属性代码示例或许可以为您提供帮助。您也可以进一步了解该属性所在类android.content.res.AssetFileDescriptor
的用法示例。
在下文中一共展示了AssetFileDescriptor.UNKNOWN_LENGTH属性的3个代码示例,这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞,您的评价将有助于系统推荐出更棒的Java代码示例。
示例1: openVideoThumbnailCleared
protected AssetFileDescriptor openVideoThumbnailCleared(long id, CancellationSignal signal)
throws FileNotFoundException {
final ContentResolver resolver = getContext().getContentResolver();
Cursor cursor = null;
try {
cursor = resolver.query(Video.Thumbnails.EXTERNAL_CONTENT_URI,
VideoThumbnailQuery.PROJECTION, Video.Thumbnails.VIDEO_ID + "=" + id, null,
null);
if (cursor.moveToFirst()) {
final String data = cursor.getString(VideoThumbnailQuery._DATA);
return new AssetFileDescriptor(ParcelFileDescriptor.open(
new File(data), ParcelFileDescriptor.MODE_READ_ONLY), 0,
AssetFileDescriptor.UNKNOWN_LENGTH);
}
} finally {
IoUtils.closeQuietly(cursor);
}
return null;
}
示例2: openDocumentThumbnail
@Override
public AssetFileDescriptor openDocumentThumbnail(
String docId, Point sizeHint, CancellationSignal signal) throws FileNotFoundException {
// TODO: extend ExifInterface to support fds
final ParcelFileDescriptor pfd = openDocument(docId, "r", signal);
return new AssetFileDescriptor(pfd, 0, AssetFileDescriptor.UNKNOWN_LENGTH);
}
示例3: openTypedAssetFile
/**
* Returns a stream of data for each supported stream type. This method does a query on the
* incoming URI, then uses
* {@link android.content.ContentProvider#openPipeHelper(Uri, String, Bundle, Object,
* PipeDataWriter)} to start another thread in which to convert the data into a stream.
*
* @param uri The URI pattern that points to the data stream
* @param mimeTypeFilter A String containing a MIME type. This method tries to get a stream of
* data with this MIME type.
* @param opts Additional options supplied by the caller. Can be interpreted as
* desired by the content provider.
* @return AssetFileDescriptor A handle to the file.
* @throws FileNotFoundException if there is no file associated with the incoming URI.
*/
@Override
public AssetFileDescriptor openTypedAssetFile(Uri uri, String mimeTypeFilter, Bundle opts)
throws FileNotFoundException {
// Checks to see if the MIME type filter matches a supported MIME type.
String[] mimeTypes = getStreamTypes(uri, mimeTypeFilter);
// If the MIME type is supported
if (mimeTypes != null) {
// Retrieves the note for this URI. Uses the query method defined for this provider,
// rather than using the database query method.
Cursor c = query(
uri, // The URI of a note
READ_NOTE_PROJECTION, // Gets a projection containing the note's ID, title,
// and contents
null, // No WHERE clause, get all matching records
null, // Since there is no WHERE clause, no selection criteria
null // Use the default sort order (modification date,
// descending
);
// If the query fails or the cursor is empty, stop
if (c == null || !c.moveToFirst()) {
// If the cursor is empty, simply close the cursor and return
if (c != null) {
c.close();
}
// If the cursor is null, throw an exception
throw new FileNotFoundException("Unable to query " + uri);
}
// Start a new thread that pipes the stream data back to the caller.
return new AssetFileDescriptor(
openPipeHelper(uri, mimeTypes[0], opts, c, this), 0,
AssetFileDescriptor.UNKNOWN_LENGTH);
}
// If the MIME type is not supported, return a read-only handle to the file.
return super.openTypedAssetFile(uri, mimeTypeFilter, opts);
}