android.database.MatrixCursor#newRow ( )源码实例Demo

@NonNull
private MatrixCursor getStickerPackInfo(@NonNull final Uri uri, @NonNull final List<StickerPack> stickerPackList) {
    final MatrixCursor cursor = new MatrixCursor(new String[] { STICKER_PACK_IDENTIFIER_IN_QUERY,
            STICKER_PACK_NAME_IN_QUERY, STICKER_PACK_PUBLISHER_IN_QUERY, STICKER_PACK_ICON_IN_QUERY,
            ANDROID_APP_DOWNLOAD_LINK_IN_QUERY, IOS_APP_DOWNLOAD_LINK_IN_QUERY, PUBLISHER_EMAIL, PUBLISHER_WEBSITE,
            PRIVACY_POLICY_WEBSITE, LICENSE_AGREEMENT_WEBSITE, IMAGE_DATA_VERSION, AVOID_CACHE, });

    for (final StickerPack stickerPack : stickerPackList) {
        final MatrixCursor.RowBuilder builder = cursor.newRow();
        builder.add(stickerPack.identifier);
        builder.add(stickerPack.name);
        builder.add(stickerPack.publisher);
        builder.add(stickerPack.trayImageFile);
        builder.add(stickerPack.androidPlayStoreLink);
        builder.add(stickerPack.iosAppStoreLink);
        builder.add(stickerPack.publisherEmail);
        builder.add(stickerPack.publisherWebsite);
        builder.add(stickerPack.privacyPolicyWebsite);
        builder.add(stickerPack.licenseAgreementWebsite);
        builder.add(stickerPack.imageDataVersion);
        builder.add(stickerPack.avoidCache ? 1 : 0);
    }

    cursor.setNotificationUri(Objects.requireNonNull(getContext()).getContentResolver(), uri);
    return cursor;
}
 

private void includeFile(final MatrixCursor result, final File file)
        throws FileNotFoundException {
    final MatrixCursor.RowBuilder row = result.newRow();
    // These columns are required
    row.add(Document.COLUMN_DOCUMENT_ID, file.getAbsolutePath());
    row.add(Document.COLUMN_DISPLAY_NAME, file.getName());
    String mimeType = getDocumentType(file.getAbsolutePath());
    row.add(Document.COLUMN_MIME_TYPE, mimeType);
    int flags = file.canWrite() ? Document.FLAG_SUPPORTS_DELETE | Document.FLAG_SUPPORTS_WRITE
            : 0;
    // We only show thumbnails for image files - expect a call to
    // openDocumentThumbnail for each file that has
    // this flag set
    if (mimeType.startsWith("image/"))
        flags |= Document.FLAG_SUPPORTS_THUMBNAIL;
    row.add(Document.COLUMN_FLAGS, flags);
    // COLUMN_SIZE is required, but can be null
    row.add(Document.COLUMN_SIZE, file.length());
    // These columns are optional
    row.add(Document.COLUMN_LAST_MODIFIED, file.lastModified());
    // Document.COLUMN_ICON can be a resource id identifying a custom icon.
    // The system provides default icons
    // based on mime type
    // Document.COLUMN_SUMMARY is optional additional information about the
    // file
}
 

/**
 * Add a row in the specified cursor for the specified file.
 * @param child the file for which to add a row.
 * @param cursor the cursor to add a row to.
 */
private void createRowForChild(File child, MatrixCursor cursor) {
  MatrixCursor.RowBuilder row = cursor.newRow();
  String type = getContext().getContentResolver().getType(Uri.fromFile(child));
  Log.v(LOG_TAG, "createRowForChild(child=" + child + ") type=" + type);
  if (type == null) type = child.isDirectory() ? Document.MIME_TYPE_DIR : "application/octet-stream";
  int flags = child.isDirectory()
    ? /*Document.FLAG_DIR_PREFERS_GRID |*/ Document.FLAG_DIR_PREFERS_LAST_MODIFIED | Document.FLAG_DIR_SUPPORTS_CREATE
    : /*Document.FLAG_SUPPORTS_WRITE*/ 0;
  row.add(Document.COLUMN_FLAGS, flags);
  row.add(Document.COLUMN_DISPLAY_NAME, child.getName());
  row.add(Document.COLUMN_DOCUMENT_ID, getDocumentId(child));
  row.add(Document.COLUMN_MIME_TYPE, type);
  row.add(Document.COLUMN_SIZE, child.isDirectory() ? child.getTotalSpace() - child.getFreeSpace() : child.length());
  row.add(Document.COLUMN_LAST_MODIFIED, null);
}
 

private void includeFile(final MatrixCursor result, final File file)
        throws FileNotFoundException {
    final MatrixCursor.RowBuilder row = result.newRow();
    // These columns are required
    row.add(Document.COLUMN_DOCUMENT_ID, file.getAbsolutePath());
    row.add(Document.COLUMN_DISPLAY_NAME, file.getName());
    String mimeType = getDocumentType(file.getAbsolutePath());
    row.add(Document.COLUMN_MIME_TYPE, mimeType);
    int flags = file.canWrite() ? Document.FLAG_SUPPORTS_DELETE | Document.FLAG_SUPPORTS_WRITE
            : 0;
    // We only show thumbnails for image files - expect a call to
    // openDocumentThumbnail for each file that has
    // this flag set
    if (mimeType.startsWith("image/"))
        flags |= Document.FLAG_SUPPORTS_THUMBNAIL;
    row.add(Document.COLUMN_FLAGS, flags);
    // COLUMN_SIZE is required, but can be null
    row.add(Document.COLUMN_SIZE, file.length());
    // These columns are optional
    row.add(Document.COLUMN_LAST_MODIFIED, file.lastModified());
    // Document.COLUMN_ICON can be a resource id identifying a custom icon.
    // The system provides default icons
    // based on mime type
    // Document.COLUMN_SUMMARY is optional additional information about the
    // file
}
 

@Override
public Cursor queryRoots(final String[] projection) throws FileNotFoundException {
    // Create a cursor with either the requested fields, or the default
    // projection if "projection" is null.
    final MatrixCursor result = new MatrixCursor(projection != null ? projection
            : DEFAULT_ROOT_PROJECTION);
    // Add Home directory
    File homeDir = Environment.getExternalStorageDirectory();
    final MatrixCursor.RowBuilder row = result.newRow();
    // These columns are required
    row.add(Root.COLUMN_ROOT_ID, homeDir.getAbsolutePath());
    row.add(Root.COLUMN_DOCUMENT_ID, homeDir.getAbsolutePath());
    row.add(Root.COLUMN_TITLE, getContext().getString(R.string.internal_storage));
    row.add(Root.COLUMN_FLAGS, Root.FLAG_LOCAL_ONLY | Root.FLAG_SUPPORTS_CREATE);
    row.add(Root.COLUMN_ICON, R.drawable.ic_provider);
    // These columns are optional
    row.add(Root.COLUMN_AVAILABLE_BYTES, homeDir.getFreeSpace());
    // Root.COLUMN_MIME_TYPE is another optional column and useful if you
    // have multiple roots with different
    // types of mime types (roots that don't match the requested mime type
    // are automatically hidden)
    return result;
}
 

@Override
public Cursor queryRoots(final String[] projection) throws FileNotFoundException {
    // Create a cursor with either the requested fields, or the default
    // projection if "projection" is null.
    final MatrixCursor result = new MatrixCursor(projection != null ? projection
            : DEFAULT_ROOT_PROJECTION);
    // Add Home directory
    File homeDir = Environment.getExternalStorageDirectory();
    final MatrixCursor.RowBuilder row = result.newRow();
    // These columns are required
    row.add(Root.COLUMN_ROOT_ID, homeDir.getAbsolutePath());
    row.add(Root.COLUMN_DOCUMENT_ID, homeDir.getAbsolutePath());
    row.add(Root.COLUMN_TITLE, getContext().getString(R.string.internal_storage));
    row.add(Root.COLUMN_FLAGS, Root.FLAG_LOCAL_ONLY | Root.FLAG_SUPPORTS_CREATE);
    row.add(Root.COLUMN_ICON, R.drawable.ic_provider);
    // These columns are optional
    row.add(Root.COLUMN_AVAILABLE_BYTES, homeDir.getFreeSpace());
    // Root.COLUMN_MIME_TYPE is another optional column and useful if you
    // have multiple roots with different
    // types of mime types (roots that don't match the requested mime type
    // are automatically hidden)
    return result;
}
 

@Override
public Cursor queryRoots(final String[] projection) throws FileNotFoundException {
    // Create a cursor with either the requested fields, or the default
    // projection if "projection" is null.
    final MatrixCursor result = new MatrixCursor(projection != null ? projection
            : DEFAULT_ROOT_PROJECTION);
    // Add Home directory
    File homeDir = Environment.getExternalStorageDirectory();
    final MatrixCursor.RowBuilder row = result.newRow();
    // These columns are required
    row.add(Root.COLUMN_ROOT_ID, homeDir.getAbsolutePath());
    row.add(Root.COLUMN_DOCUMENT_ID, homeDir.getAbsolutePath());
    row.add(Root.COLUMN_TITLE, getContext().getString(R.string.internal_storage));
    row.add(Root.COLUMN_FLAGS, Root.FLAG_LOCAL_ONLY | Root.FLAG_SUPPORTS_CREATE);
    row.add(Root.COLUMN_ICON, R.drawable.ic_provider);
    // These columns are optional
    row.add(Root.COLUMN_AVAILABLE_BYTES, homeDir.getFreeSpace());
    // Root.COLUMN_MIME_TYPE is another optional column and useful if you
    // have multiple roots with different
    // types of mime types (roots that don't match the requested mime type
    // are automatically hidden)
    return result;
}
 

private void includeFile(final MatrixCursor result, final File file)
        throws FileNotFoundException {
    final MatrixCursor.RowBuilder row = result.newRow();
    // These columns are required
    row.add(Document.COLUMN_DOCUMENT_ID, file.getAbsolutePath());
    row.add(Document.COLUMN_DISPLAY_NAME, file.getName());
    String mimeType = getDocumentType(file.getAbsolutePath());
    row.add(Document.COLUMN_MIME_TYPE, mimeType);
    int flags = file.canWrite() ? Document.FLAG_SUPPORTS_DELETE | Document.FLAG_SUPPORTS_WRITE
            : 0;
    // We only show thumbnails for image files - expect a call to
    // openDocumentThumbnail for each file that has
    // this flag set
    if (mimeType.startsWith("image/"))
        flags |= Document.FLAG_SUPPORTS_THUMBNAIL;
    row.add(Document.COLUMN_FLAGS, flags);
    // COLUMN_SIZE is required, but can be null
    row.add(Document.COLUMN_SIZE, file.length());
    // These columns are optional
    row.add(Document.COLUMN_LAST_MODIFIED, file.lastModified());
    // Document.COLUMN_ICON can be a resource id identifying a custom icon.
    // The system provides default icons
    // based on mime type
    // Document.COLUMN_SUMMARY is optional additional information about the
    // file
}
 

private void includeFile(final MatrixCursor result, final File file) throws FileNotFoundException {
    final MatrixCursor.RowBuilder row = result.newRow();
    // These columns are required
    row.add(Document.COLUMN_DOCUMENT_ID, file.getAbsolutePath());
    row.add(Document.COLUMN_DISPLAY_NAME, file.getName());
    String mimeType = getDocumentType(file.getAbsolutePath());
    row.add(Document.COLUMN_MIME_TYPE, mimeType);
    int flags = file.canWrite() ? Document.FLAG_SUPPORTS_DELETE | Document.FLAG_SUPPORTS_WRITE : 0;
    // We only show thumbnails for image files - expect a call to
    // openDocumentThumbnail for each file that has
    // this flag set
    if (mimeType.startsWith("image/"))
        flags |= Document.FLAG_SUPPORTS_THUMBNAIL;
    row.add(Document.COLUMN_FLAGS, flags);
    // COLUMN_SIZE is required, but can be null
    row.add(Document.COLUMN_SIZE, file.length());
    // These columns are optional
    row.add(Document.COLUMN_LAST_MODIFIED, file.lastModified());
    // Document.COLUMN_ICON can be a resource id identifying a custom icon.
    // The system provides default icons
    // based on mime type
    // Document.COLUMN_SUMMARY is optional additional information about the
    // file
}
 

/**
 * Add a representation of a file to a cursor.
 *
 * @param result the cursor to modify
 * @param file   the File object representing the desired file (may be null if given docID)
 */
private void includeFile(MatrixCursor result, File file) {
    MatrixCursor.RowBuilder row = result.newRow();
    row.add(ImageContract.Columns.DISPLAY_NAME, file.getName());
    row.add(ImageContract.Columns.SIZE, file.length());
    row.add(ImageContract.Columns.ABSOLUTE_PATH, file.getAbsolutePath());
}
 

public void createFileRow(MatrixCursor result, String documentId) {
	MatrixCursor.RowBuilder row = result.newRow();

	row.add(DocumentsContract.Document.COLUMN_DOCUMENT_ID, documentId);
	row.add(DocumentsContract.Document.COLUMN_DISPLAY_NAME, this.getDocumentName(documentId));
	row.add(DocumentsContract.Document.COLUMN_MIME_TYPE, this.getMimeType(documentId));
}
 

private static MatrixCursor getRecordedProgramCursor(ContentValues contentValues) {
    String[] rows = RecordedProgram.PROJECTION;
    MatrixCursor cursor = new MatrixCursor(rows);
    MatrixCursor.RowBuilder builder = cursor.newRow();
    for (String row : rows) {
        builder.add(row, contentValues.get(row));
    }
    cursor.moveToFirst();
    return cursor;
}
 

private static MatrixCursor getProgramCursor(ContentValues contentValues) {
    String[] rows = Program.PROJECTION;
    MatrixCursor cursor = new MatrixCursor(rows);
    MatrixCursor.RowBuilder builder = cursor.newRow();
    for(String row: rows) {
        if (row != null) {
            builder.add(row, contentValues.get(row));
        }
    }
    cursor.moveToFirst();
    return cursor;
}
 

private static MatrixCursor getRecordedProgramCursor(ContentValues contentValues) {
    String[] rows = RecordedProgram.PROJECTION;
    MatrixCursor cursor = new MatrixCursor(rows);
    MatrixCursor.RowBuilder builder = cursor.newRow();
    for (String row : rows) {
        builder.add(row, contentValues.get(row));
    }
    cursor.moveToFirst();
    return cursor;
}
 

private static MatrixCursor getChannelCursor(ContentValues contentValues) {
    String[] rows = Channel.PROJECTION;
    MatrixCursor cursor = new MatrixCursor(rows);
    MatrixCursor.RowBuilder builder = cursor.newRow();
    for(String row: rows) {
        if (row != null) {
            builder.add(row, contentValues.get(row));
        }
    }
    cursor.moveToFirst();
    return cursor;
}
 

@Override
public Cursor queryRoots(String[] projection) throws FileNotFoundException {
	MatrixCursor result = new MatrixCursor(this.resolveProjection(projection, DEFAULT_ROOT_PROJECTION));
	MatrixCursor.RowBuilder row = result.newRow();

	row.add(DocumentsContract.Root.COLUMN_ROOT_ID, ROOT_ID);
	row.add(DocumentsContract.Root.COLUMN_SUMMARY, getContext().getString(R.string.storage_saf_assets_provider_title));
	row.add(DocumentsContract.Root.COLUMN_FLAGS, DocumentsContract.Root.FLAG_SUPPORTS_RECENTS | DocumentsContract.Root.FLAG_SUPPORTS_SEARCH);
	row.add(DocumentsContract.Root.COLUMN_TITLE, getContext().getString(R.string.storage_saf_assets_provider_title));
	row.add(DocumentsContract.Root.COLUMN_DOCUMENT_ID, ROOT_ID);

	return result;
}
 

@Override
public Cursor queryRoots(String[] projection) throws FileNotFoundException {
    Log.v(TAG, "queryRoots");

    // Create a cursor with either the requested fields, or the default projection.  This
    // cursor is returned to the Android system picker UI and used to display all roots from
    // this provider.
    final MatrixCursor result = new MatrixCursor(resolveRootProjection(projection));

    // If user is not logged in, return an empty root cursor.  This removes our provider from
    // the list entirely.
    if (!isUserLoggedIn()) {
        return result;
    }

    // It's possible to have multiple roots (e.g. for multiple accounts in the same app) -
    // just add multiple cursor rows.
    // Construct one row for a root called "MyCloud".
    final MatrixCursor.RowBuilder row = result.newRow();

    row.add(Root.COLUMN_ROOT_ID, ROOT);
    row.add(Root.COLUMN_SUMMARY, getContext().getString(R.string.root_summary));

    // FLAG_SUPPORTS_CREATE means at least one directory under the root supports creating
    // documents.  FLAG_SUPPORTS_RECENTS means your application's most recently used
    // documents will show up in the "Recents" category.  FLAG_SUPPORTS_SEARCH allows users
    // to search all documents the application shares.
    row.add(Root.COLUMN_FLAGS, Root.FLAG_SUPPORTS_CREATE |
            Root.FLAG_SUPPORTS_RECENTS |
            Root.FLAG_SUPPORTS_SEARCH);

    // COLUMN_TITLE is the root title (e.g. what will be displayed to identify your provider).
    row.add(Root.COLUMN_TITLE, getContext().getString(R.string.app_name));

    // This document id must be unique within this provider and consistent across time.  The
    // system picker UI may save it and refer to it later.
    row.add(Root.COLUMN_DOCUMENT_ID, getDocIdForFile(mBaseDir));

    // The child MIME types are used to filter the roots and only present to the user roots
    // that contain the desired type somewhere in their file hierarchy.
    row.add(Root.COLUMN_MIME_TYPES, getChildMimeTypes(mBaseDir));
    row.add(Root.COLUMN_AVAILABLE_BYTES, mBaseDir.getFreeSpace());
    row.add(Root.COLUMN_ICON, R.drawable.ic_launcher);

    return result;
}
 

/**
 * 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()) {
        // Request the folder to lay out as a grid rather than a list. This also allows a larger
        // thumbnail to be displayed for each image.
        //            flags |= Document.FLAG_DIR_PREFERS_GRID;

        // 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);
}
 

/**
 * 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()) {
        // Request the folder to lay out as a grid rather than a list. This also allows a larger
        // thumbnail to be displayed for each image.
        //            flags |= Document.FLAG_DIR_PREFERS_GRID;

        // 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);
}
 

@Override
public Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs,
        String sortOrder) {
    Uri fileUri = getFileUriWhenReady(uri);
    if (fileUri == null) return null;

    // Workaround for a bad assumption that particular MediaStore columns exist by certain third
    // party applications.
    // http://crbug.com/467423.
    Cursor source = super.query(fileUri, projection, selection, selectionArgs, sortOrder);

    String[] columnNames = source.getColumnNames();
    String[] newColumnNames = columnNamesWithData(columnNames);
    if (columnNames == newColumnNames) return source;

    MatrixCursor cursor = new MatrixCursor(newColumnNames, source.getCount());

    source.moveToPosition(-1);
    while (source.moveToNext()) {
        MatrixCursor.RowBuilder row = cursor.newRow();
        for (int i = 0; i < columnNames.length; i++) {
            switch (source.getType(i)) {
                case Cursor.FIELD_TYPE_INTEGER:
                    row.add(source.getInt(i));
                    break;
                case Cursor.FIELD_TYPE_FLOAT:
                    row.add(source.getFloat(i));
                    break;
                case Cursor.FIELD_TYPE_STRING:
                    row.add(source.getString(i));
                    break;
                case Cursor.FIELD_TYPE_BLOB:
                    row.add(source.getBlob(i));
                    break;
                case Cursor.FIELD_TYPE_NULL:
                default:
                    row.add(null);
                    break;
            }
        }
    }

    source.close();
    return cursor;
}