Java Code Examples for android.content.res.AssetFileDescriptor#getParcelFileDescriptor()

@Nullable @Override public AssetFileDescriptor openAssetFile(@NonNull final Uri uri, @NonNull final String mode) throws FileNotFoundException {
	final String filename = uri.getLastPathSegment();
	if (filename == null) throw new FileNotFoundException();
	final Context context = Objects.requireNonNull(getContext());
	try {
		final String suffix = context.getString(R.string.repacked_asset_suffix);
		final int offset = context.getResources().getInteger(R.integer.repacked_asset_offset);
		final AssetFileDescriptor afd = Objects.requireNonNull(context).getAssets().openFd(
				! suffix.isEmpty() && filename.endsWith(suffix) ? filename + context.getString(R.string.repacked_asset_appendix) : filename);
		return new AssetFileDescriptor(afd.getParcelFileDescriptor(), afd.getStartOffset() + offset, afd.getLength() - offset);
	} catch (final IOException e) {
		Log.e(WeChatDecorator.TAG, "Error opening asset", e);
		return null;
	}
}
 

@Override
public ParcelFileDescriptor openFile(Uri uri, String mode)
        throws FileNotFoundException {
    initIfNecessary();
    AssetFileDescriptor af = openAssetFile(uri, mode);
    if (null != af) {
        return af.getParcelFileDescriptor();
    }
    return null;
}
 

@Override
public ParcelFileDescriptor openFile(Uri uri, String mode)
		throws FileNotFoundException {
       initIfNecessary();
	AssetFileDescriptor af = openAssetFile(uri, mode);
	if ( null != af ) {
		return af.getParcelFileDescriptor();
	}
	return null;
}
 

@Override
public ParcelFileDescriptor openFile(Uri uri, String mode)
		throws FileNotFoundException {
       initIfNecessary();
	AssetFileDescriptor af = openAssetFile(uri, mode);
	if ( null != af ) {
		return af.getParcelFileDescriptor();
	}
	return null;
}
 

@Override
public ParcelFileDescriptor openFile(Uri uri, String mode)
		throws FileNotFoundException {
       initIfNecessary();
	AssetFileDescriptor af = openAssetFile(uri, mode);
	if ( null != af ) {
		return af.getParcelFileDescriptor();
	}
	return null;
}
 

/**
 * Open a raw file descriptor to access data under a URI.  This
 * is like {@link #openAssetFileDescriptor(Uri, String)}, but uses the
 * underlying {@link ContentProvider#openFile}
 * ContentProvider.openFile()} method, so will <em>not</em> work with
 * providers that return sub-sections of files.  If at all possible,
 * you should use {@link #openAssetFileDescriptor(Uri, String)}.  You
 * will receive a FileNotFoundException exception if the provider returns a
 * sub-section of a file.
 *
 * <h5>Accepts the following URI schemes:</h5>
 * <ul>
 * <li>content ({@link #SCHEME_CONTENT})</li>
 * <li>file ({@link #SCHEME_FILE})</li>
 * </ul>
 *
 * <p>See {@link #openAssetFileDescriptor(Uri, String)} for more information
 * on these schemes.
 * <p>
 * If opening with the exclusive "r" or "w" modes, the returned
 * ParcelFileDescriptor could be a pipe or socket pair to enable streaming
 * of data. Opening with the "rw" mode implies a file on disk that supports
 * seeking. If possible, always use an exclusive mode to give the underlying
 * {@link ContentProvider} the most flexibility.
 * <p>
 * If you are writing a file, and need to communicate an error to the
 * provider, use {@link ParcelFileDescriptor#closeWithError(String)}.
 *
 * @param uri The desired URI to open.
 * @param mode The file mode to use, as per {@link ContentProvider#openFile
 * ContentProvider.openFile}.
 * @param cancellationSignal A signal to cancel the operation in progress,
 *         or null if none. If the operation is canceled, then
 *         {@link OperationCanceledException} will be thrown.
 * @return Returns a new ParcelFileDescriptor pointing to the file.  You
 * own this descriptor and are responsible for closing it when done.
 * @throws FileNotFoundException Throws FileNotFoundException if no
 * file exists under the URI or the mode is invalid.
 * @see #openAssetFileDescriptor(Uri, String)
 */
public final @Nullable ParcelFileDescriptor openFileDescriptor(@NonNull Uri uri,
        @NonNull String mode, @Nullable CancellationSignal cancellationSignal)
                throws FileNotFoundException {
    AssetFileDescriptor afd = openAssetFileDescriptor(uri, mode, cancellationSignal);
    if (afd == null) {
        return null;
    }

    if (afd.getDeclaredLength() < 0) {
        // This is a full file!
        return afd.getParcelFileDescriptor();
    }

    // Client can't handle a sub-section of a file, so close what
    // we got and bail with an exception.
    try {
        afd.close();
    } catch (IOException e) {
    }

    throw new FileNotFoundException("Not a whole file");
}
 

/**
 * Open a raw file descriptor to access data under a URI.  This
 * is like {@link #openAssetFileDescriptor(Uri, String)}, but uses the
 * underlying {@link ContentProvider#openFile}
 * ContentProvider.openFile()} method, so will <em>not</em> work with
 * providers that return sub-sections of files.  If at all possible,
 * you should use {@link #openAssetFileDescriptor(Uri, String)}.  You
 * will receive a FileNotFoundException exception if the provider returns a
 * sub-section of a file.
 *
 * <h5>Accepts the following URI schemes:</h5>
 * <ul>
 * <li>content ({@link #SCHEME_CONTENT})</li>
 * <li>file ({@link #SCHEME_FILE})</li>
 * </ul>
 *
 * <p>See {@link #openAssetFileDescriptor(Uri, String)} for more information
 * on these schemes.
 * <p>
 * If opening with the exclusive "r" or "w" modes, the returned
 * ParcelFileDescriptor could be a pipe or socket pair to enable streaming
 * of data. Opening with the "rw" mode implies a file on disk that supports
 * seeking. If possible, always use an exclusive mode to give the underlying
 * {@link ContentProvider} the most flexibility.
 * <p>
 * If you are writing a file, and need to communicate an error to the
 * provider, use {@link ParcelFileDescriptor#closeWithError(String)}.
 *
 * @param uri The desired URI to open.
 * @param mode The file mode to use, as per {@link ContentProvider#openFile
 * ContentProvider.openFile}.
 * @param cancellationSignal A signal to cancel the operation in progress,
 *         or null if none. If the operation is canceled, then
 *         {@link OperationCanceledException} will be thrown.
 * @return Returns a new ParcelFileDescriptor pointing to the file.  You
 * own this descriptor and are responsible for closing it when done.
 * @throws FileNotFoundException Throws FileNotFoundException if no
 * file exists under the URI or the mode is invalid.
 * @see #openAssetFileDescriptor(Uri, String)
 */
public final @Nullable ParcelFileDescriptor openFileDescriptor(@NonNull Uri uri,
        @NonNull String mode, @Nullable CancellationSignal cancellationSignal)
                throws FileNotFoundException {
    AssetFileDescriptor afd = openAssetFileDescriptor(uri, mode, cancellationSignal);
    if (afd == null) {
        return null;
    }

    if (afd.getDeclaredLength() < 0) {
        // This is a full file!
        return afd.getParcelFileDescriptor();
    }

    // Client can't handle a sub-section of a file, so close what
    // we got and bail with an exception.
    try {
        afd.close();
    } catch (IOException e) {
    }

    throw new FileNotFoundException("Not a whole file");
}