android.provider.DocumentsContract.Document#MIME_TYPE_DIR源码实例Demo

/**
 * 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);
}
 

@Override
public String getDocumentType(final String documentId) throws FileNotFoundException {
    File file = new File(documentId);
    if (file.isDirectory())
        return Document.MIME_TYPE_DIR;
    // From FileProvider.getType(Uri)
    final int lastDot = file.getName().lastIndexOf('.');
    if (lastDot >= 0) {
        final String extension = file.getName().substring(lastDot + 1);
        final String mime = MimeTypeMap.getSingleton().getMimeTypeFromExtension(extension);
        if (mime != null) {
            return mime;
        }
    }
    return "application/octet-stream";
}
 

@Override
public String getDocumentType(final String documentId) throws FileNotFoundException {
    File file = new File(documentId);
    if (file.isDirectory())
        return Document.MIME_TYPE_DIR;
    // From FileProvider.getType(Uri)
    final int lastDot = file.getName().lastIndexOf('.');
    if (lastDot >= 0) {
        final String extension = file.getName().substring(lastDot + 1);
        final String mime = MimeTypeMap.getSingleton().getMimeTypeFromExtension(extension);
        if (mime != null) {
            return mime;
        }
    }
    return "application/octet-stream";
}
 

@Override
public String getDocumentType(final String documentId) throws FileNotFoundException {
    File file = new File(documentId);
    if (file.isDirectory())
        return Document.MIME_TYPE_DIR;
    // From FileProvider.getType(Uri)
    final int lastDot = file.getName().lastIndexOf('.');
    if (lastDot >= 0) {
        final String extension = file.getName().substring(lastDot + 1);
        final String mime = MimeTypeMap.getSingleton().getMimeTypeFromExtension(extension);
        if (mime != null) {
            return mime;
        }
    }
    return "application/octet-stream";
}
 

@Override
public String getDocumentType(final String documentId) throws FileNotFoundException {
    File file = new File(documentId);
    if (file.isDirectory())
        return Document.MIME_TYPE_DIR;
    // From FileProvider.getType(Uri)
    final int lastDot = file.getName().lastIndexOf('.');
    if (lastDot >= 0) {
        final String extension = file.getName().substring(lastDot + 1);
        final String mime = MimeTypeMap.getSingleton().getMimeTypeFromExtension(extension);
        if (mime != null) {
            return mime;
        }
    }
    return "application/octet-stream";
}
 

@Override
public String getDocumentType(final String documentId) throws FileNotFoundException {
	File file = new File(documentId);
	if (file.isDirectory())
		return Document.MIME_TYPE_DIR;
	// From FileProvider.getType(Uri)
	final int lastDot = file.getName().lastIndexOf('.');
	if (lastDot >= 0) {
		final String extension = file.getName().substring(lastDot + 1);
		final String mime = MimeTypeMap.getSingleton().getMimeTypeFromExtension(extension);
		if (mime != null) {
			return mime;
		}
	}
	return "application/octet-stream";
}
 

@Override
public String getDocumentType(final String documentId) throws FileNotFoundException {
    File file = new File(documentId);
    if (file.isDirectory())
        return Document.MIME_TYPE_DIR;
    // From FileProvider.getType(Uri)
    final int lastDot = file.getName().lastIndexOf('.');
    if (lastDot >= 0) {
        final String extension = file.getName().substring(lastDot + 1);
        final String mime = MimeTypeMap.getSingleton().getMimeTypeFromExtension(extension);
        if (mime != null) {
            return mime;
        }
    }
    return "application/octet-stream";
}
 

@Override
public String getDocumentType(final String documentId) throws FileNotFoundException {
    File file = new File(documentId);
    if (file.isDirectory())
        return Document.MIME_TYPE_DIR;
    // From FileProvider.getType(Uri)
    final int lastDot = file.getName().lastIndexOf('.');
    if (lastDot >= 0) {
        final String extension = file.getName().substring(lastDot + 1);
        final String mime = MimeTypeMap.getSingleton().getMimeTypeFromExtension(extension);
        if (mime != null) {
            return mime;
        }
    }
    return "application/octet-stream";
}
 

@Override
public String getDocumentType(final String documentId) throws FileNotFoundException {
    File file = new File(documentId);
    if (file.isDirectory())
        return Document.MIME_TYPE_DIR;
    // From FileProvider.getType(Uri)
    final int lastDot = file.getName().lastIndexOf('.');
    if (lastDot >= 0) {
        final String extension = file.getName().substring(lastDot + 1);
        final String mime = MimeTypeMap.getSingleton().getMimeTypeFromExtension(extension);
        if (mime != null) {
            return mime;
        }
    }
    return "application/octet-stream";
}
 

/**
 * Get a file's MIME type
 *
 * @param file the File object whose type we want
 * @return the MIME type of the file
 */
private static String getTypeForFile(File file) {
    if (file.isDirectory()) {
        return Document.MIME_TYPE_DIR;
    } else {
        return getTypeForName(file.getName());
    }
}
 

public String getMimeType() {
  switch (mEntry.getType()) {
    case DirectoryEntry.FILE_SHARE:
    case DirectoryEntry.WORKGROUP:
    case DirectoryEntry.SERVER:
    case DirectoryEntry.DIR:
      return Document.MIME_TYPE_DIR;

    case DirectoryEntry.LINK:
    case DirectoryEntry.COMMS_SHARE:
    case DirectoryEntry.IPC_SHARE:
    case DirectoryEntry.PRINTER_SHARE:
      throw new UnsupportedOperationException(
          "Unsupported type of Samba directory entry " + mEntry.getType());

    case DirectoryEntry.FILE:
      final String ext = getExtension(mEntry.getName());
      if (ext == null) {
        return GENERIC_MIME_TYPE;
      }

      final String mimeType = MimeTypeMap.getSingleton().getMimeTypeFromExtension(ext);
      return (mimeType == null) ? GENERIC_MIME_TYPE : mimeType;
  }

  throw new IllegalStateException("Should never reach here.");
}
 

/**
 * Get a file's MIME type
 *
 * @param file the File object whose type we want
 * @return the MIME type of the file
 */
private static String getTypeForFile(File file) {
    if (file.isDirectory()) {
        return Document.MIME_TYPE_DIR;
    } else {
        return getTypeForName(file.getName());
    }
}