Examples with MatrixCursor android.database.MatrixCursor used on opensource projects

Example 6 with MatrixCursor

use of android.database.MatrixCursor in project Android-Developers-Samples by johnjohndoe.

the class MyCloudProvider method querySearchDocuments.

// END_INCLUDE(query_recent_documents)
// BEGIN_INCLUDE(query_search_documents)
@Override
public Cursor querySearchDocuments(String rootId, String query, String[] projection) throws FileNotFoundException {
    Log.v(TAG, "querySearchDocuments");
    // Create a cursor with the requested projection, or the default projection.
    final MatrixCursor result = new MatrixCursor(resolveDocumentProjection(projection));
    final File parent = getFileForDocId(rootId);
    // This example implementation searches file names for the query and doesn't rank search
    // results, so we can stop as soon as we find a sufficient number of matches.  Other
    // implementations might use other data about files, rather than the file name, to
    // produce a match; it might also require a network call to query a remote server.
    // Iterate through all files in the file structure under the root until we reach the
    // desired number of matches.
    final LinkedList<File> pending = new LinkedList<File>();
    // Start by adding the parent to the list of files to be processed
    pending.add(parent);
    // Do while we still have unexamined files, and fewer than the max search results
    while (!pending.isEmpty() && result.getCount() < MAX_SEARCH_RESULTS) {
        // Take a file from the list of unprocessed files
        final File file = pending.removeFirst();
        if (file.isDirectory()) {
            // If it's a directory, add all its children to the unprocessed list
            Collections.addAll(pending, file.listFiles());
        } else {
            // If it's a file and it matches, add it to the result cursor.
            if (file.getName().toLowerCase().contains(query)) {
                includeFile(result, null, file);
            }
        }
    }
    return result;
}

Example 7 with MatrixCursor

use of android.database.MatrixCursor in project Android-Developers-Samples by johnjohndoe.

the class MyCloudProvider method queryChildDocuments.

// END_INCLUDE(query_document)
// BEGIN_INCLUDE(query_child_documents)
@Override
public Cursor queryChildDocuments(String parentDocumentId, String[] projection, String sortOrder) throws FileNotFoundException {
    Log.v(TAG, "queryChildDocuments, parentDocumentId: " + parentDocumentId + " sortOrder: " + sortOrder);
    final MatrixCursor result = new MatrixCursor(resolveDocumentProjection(projection));
    final File parent = getFileForDocId(parentDocumentId);
    for (File file : parent.listFiles()) {
        includeFile(result, null, file);
    }
    return result;
}

Example 8 with MatrixCursor

use of android.database.MatrixCursor in project Android-Developers-Samples by johnjohndoe.

the class MyCloudProvider method includeFile.

/**
     * Add a representation of a file to a cursor.
     *
     * @param result the cursor to modify
     * @param docId  the document ID representing the desired file (may be null if given file)
     * @param file   the File object representing the desired file (may be null if given docID)
     * @throws java.io.FileNotFoundException
     */
private void includeFile(MatrixCursor result, String docId, File file) throws FileNotFoundException {
    if (docId == null) {
        docId = getDocIdForFile(file);
    } else {
        file = getFileForDocId(docId);
    }
    int flags = 0;
    if (file.isDirectory()) {
        // Add FLAG_DIR_SUPPORTS_CREATE if the file is a writable directory.
        if (file.isDirectory() && file.canWrite()) {
            flags |= Document.FLAG_DIR_SUPPORTS_CREATE;
        }
    } else if (file.canWrite()) {
        // If the file is writable set FLAG_SUPPORTS_WRITE and
        // FLAG_SUPPORTS_DELETE
        flags |= Document.FLAG_SUPPORTS_WRITE;
        flags |= Document.FLAG_SUPPORTS_DELETE;
    }
    final String displayName = file.getName();
    final String mimeType = getTypeForFile(file);
    if (mimeType.startsWith("image/")) {
        // Allow the image to be represented by a thumbnail rather than an icon
        flags |= Document.FLAG_SUPPORTS_THUMBNAIL;
    }
    final MatrixCursor.RowBuilder row = result.newRow();
    row.add(Document.COLUMN_DOCUMENT_ID, docId);
    row.add(Document.COLUMN_DISPLAY_NAME, displayName);
    row.add(Document.COLUMN_SIZE, file.length());
    row.add(Document.COLUMN_MIME_TYPE, mimeType);
    row.add(Document.COLUMN_LAST_MODIFIED, file.lastModified());
    row.add(Document.COLUMN_FLAGS, flags);
    // Add a custom icon
    row.add(Document.COLUMN_ICON, R.drawable.ic_launcher);
}

Example 9 with MatrixCursor

use of android.database.MatrixCursor in project Android-Developers-Samples by johnjohndoe.

the class MyCloudProvider method queryRecentDocuments.

// END_INCLUDE(query_roots)
// BEGIN_INCLUDE(query_recent_documents)
@Override
public Cursor queryRecentDocuments(String rootId, String[] projection) throws FileNotFoundException {
    Log.v(TAG, "queryRecentDocuments");
    // This example implementation walks a local file structure to find the most recently
    // modified files.  Other implementations might include making a network call to query a
    // server.
    // Create a cursor with the requested projection, or the default projection.
    final MatrixCursor result = new MatrixCursor(resolveDocumentProjection(projection));
    final File parent = getFileForDocId(rootId);
    // Create a queue to store the most recent documents, which orders by last modified.
    PriorityQueue<File> lastModifiedFiles = new PriorityQueue<File>(5, new Comparator<File>() {

        public int compare(File i, File j) {
            return Long.compare(i.lastModified(), j.lastModified());
        }
    });
    // Iterate through all files and directories in the file structure under the root.  If
    // the file is more recent than the least recently modified, add it to the queue,
    // limiting the number of results.
    final LinkedList<File> pending = new LinkedList<File>();
    // Start by adding the parent to the list of files to be processed
    pending.add(parent);
    // Do while we still have unexamined files
    while (!pending.isEmpty()) {
        // Take a file from the list of unprocessed files
        final File file = pending.removeFirst();
        if (file.isDirectory()) {
            // If it's a directory, add all its children to the unprocessed list
            Collections.addAll(pending, file.listFiles());
        } else {
            // If it's a file, add it to the ordered queue.
            lastModifiedFiles.add(file);
        }
    }
    // Add the most recent files to the cursor, not exceeding the max number of results.
    for (int i = 0; i < Math.min(MAX_LAST_MODIFIED + 1, lastModifiedFiles.size()); i++) {
        final File file = lastModifiedFiles.remove();
        includeFile(result, null, file);
    }
    return result;
}

Example 10 with MatrixCursor

use of android.database.MatrixCursor in project Android-Developers-Samples by johnjohndoe.

the class MyCloudProvider method queryDocument.

// END_INCLUDE(open_document_thumbnail)
// BEGIN_INCLUDE(query_document)
@Override
public Cursor queryDocument(String documentId, String[] projection) throws FileNotFoundException {
    Log.v(TAG, "queryDocument");
    // Create a cursor with the requested projection, or the default projection.
    final MatrixCursor result = new MatrixCursor(resolveDocumentProjection(projection));
    includeFile(result, documentId, null);
    return result;
}