Java Code Examples for androidx.documentfile.provider.DocumentFile#findFile()

/**
 * 指定したUriが存在する時にその下に出力用ファイルを生成してOutputStreamとして返す
 * @param context
 * @param parent
 * @param dirs
 * @param mime
 * @param name
 * @return
 * @throws FileNotFoundException
 * @throws IOException
 */
@NonNull
public static InputStream getInputStream(
	@NonNull final Context context,
	@NonNull final DocumentFile parent, @Nullable final String dirs,
	final String mime, final String name) throws IOException {

	final DocumentFile tree = getDir(parent, dirs);
	final DocumentFile file = tree.findFile(name);
	if (file != null) {
		if (file.isFile()) {
			return context.getContentResolver().openInputStream(
				file.getUri());
		} else {
			throw new IOException("directory with same name already exists");
		}
	} else {
		throw new FileNotFoundException("specific file not found");
	}
}
 

/**
 * 指定したUriが存在する時にその下に出力用ファイルを生成してOutputStreamとして返す
 * @param context
 * @param parent
 * @param dirs
 * @param mime
 * @param name
 * @return
 * @throws FileNotFoundException
 */
@NonNull
public static OutputStream getOutputStream(
	@NonNull final Context context,
	@NonNull final DocumentFile parent, @Nullable final String dirs,
	final String mime, final String name) throws IOException {

	final DocumentFile tree = getDir(parent, dirs);
	final DocumentFile file = tree.findFile(name);
	if (file != null) {
		if (file.isFile()) {
			return context.getContentResolver().openOutputStream(
				file.getUri());
		} else {
			throw new IOException("directory with same name already exists");
		}
	} else {
		return context.getContentResolver().openOutputStream(
			tree.createFile(mime, name).getUri());
	}
}
 

public static DocumentFile createDirIfNotExist(DocumentFile root, String... subDirs) {
    DocumentFile parent = root;
    try {
        for (int i = 0; i < subDirs.length; i++) {
            String subDirName = filenameFilter(Uri.decode(subDirs[i]));
            DocumentFile subDir = parent.findFile(subDirName);
            if (subDir == null) {
                subDir = parent.createDirectory(subDirName);
            }
            parent = subDir;
        }
    } catch (Exception e) {
        e.printStackTrace();
        return null;
    }
    return parent;
}
 

public static DocumentFile getDirDocument(DocumentFile root, String... subDirs) {
    DocumentFile parent = root;
    for (int i = 0; i < subDirs.length; i++) {
        String subDirName = Uri.decode(subDirs[i]);
        DocumentFile subDir = parent.findFile(subDirName);
        if (subDir != null)
            parent = subDir;
        else
            return null;
    }
    return parent;
}
 

public static boolean isFileExist(String fileName, DocumentFile root, String... subDirs) {
    DocumentFile parent = getDirDocument(root, subDirs);
    if (parent == null)
        return false;
    fileName = filenameFilter(Uri.decode(fileName));
    DocumentFile file = parent.findFile(fileName);
    if (file != null && file.exists())
        return true;
    return false;
}
 

public static boolean writeBytes(Context context, byte[] data, String fileName, String rootPath, String... subDirs) {
    DocumentFile parent = getDirDocument(context, rootPath, subDirs);
    if (parent == null)
        return false;
    DocumentFile file = parent.findFile(fileName);
    return writeBytes(context, data, file.getUri());
}
 

public static InputStream getFileInputSteam(Context context, String fileName, DocumentFile root, String... subDirs) {
    DocumentFile parent = getDirDocument(root, subDirs);
    if (parent == null)
        return null;
    DocumentFile file = parent.findFile(fileName);
    if (file == null)
        return null;
    return getFileInputSteam(context, file.getUri());
}
 

public static InputStream getFileInputSteam(Context context, String fileName, Uri rootUri, String... subDirs) {
    DocumentFile parent = getDirDocument(context, rootUri, subDirs);
    if (parent == null)
        return null;
    fileName = filenameFilter(Uri.decode(fileName));
    DocumentFile file = parent.findFile(fileName);
    if (file == null)
        return null;
    return getFileInputSteam(context, file.getUri());
}
 

public static InputStream getFileInputSteam(Context context, String fileName, String rootPath, String... subDirs) {
    DocumentFile parent = getDirDocument(context, rootPath, subDirs);
    if (parent == null)
        return null;
    DocumentFile file = parent.findFile(fileName);
    if (file == null)
        return null;
    return getFileInputSteam(context, file.getUri());
}
 

public static OutputStream getFileOutputSteam(Context context, String fileName, DocumentFile root, String... subDirs) {
    DocumentFile parent = getDirDocument(root, subDirs);
    if (parent == null)
        return null;
    DocumentFile file = parent.findFile(fileName);
    if (file == null)
        return null;
    return getFileOutputSteam(context, file.getUri());
}
 

public static boolean writeBytes(Context context, byte[] data, String fileName, Uri rootUri, String... subDirs) {
    DocumentFile parent = getDirDocument(context, rootUri, subDirs);
    if (parent == null)
        return false;
    fileName = filenameFilter(Uri.decode(fileName));
    DocumentFile file = parent.findFile(fileName);
    return writeBytes(context, data, file.getUri());
}
 

public static OutputStream getFileOutputSteam(Context context, String fileName, String rootPath, String... subDirs) {
    DocumentFile parent = getDirDocument(context, rootPath, subDirs);
    if (parent == null)
        return null;
    DocumentFile file = parent.findFile(fileName);
    if (file == null)
        return null;
    return getFileOutputSteam(context, file.getUri());
}
 

public static boolean isFileExist(String fileName, DocumentFile root, String... subDirs) {
    DocumentFile parent = getDirDocument(root, subDirs);
    if (parent == null)
        return false;
    fileName = filenameFilter(Uri.decode(fileName));
    DocumentFile file = parent.findFile(fileName);
    if (file != null && file.exists())
        return true;
    return false;
}
 

public static byte[] readBytes(Context context, String fileName, DocumentFile root, String... subDirs) {
    DocumentFile parent = getDirDocument(root, subDirs);
    if (parent == null)
        return null;
    fileName = filenameFilter(Uri.decode(fileName));
    DocumentFile file = parent.findFile(fileName);
    if (file == null)
        return null;
    return readBytes(context, file.getUri());
}
 

/**
 * 指定したDocumentFileが書き込み可能であればその下にディレクトリを生成して
 * そのディレクトリを示すDocumentFileオブジェクトを返す
 * @param parent
 * @param dirs
 * @return
 * @throws IOException
 */
@NonNull
public static DocumentFile getDir(
	@NonNull final DocumentFile parent, @Nullable final String dirs)
		throws IOException {
	
	DocumentFile tree = parent;
	if (!TextUtils.isEmpty(dirs)) {
		final String[] dir = dirs.split("/");
		for (final String d: dir) {
			if (!TextUtils.isEmpty(d)) {
				final DocumentFile t = tree.findFile(d);
				if ((t != null) && t.isDirectory()) {
					// 既に存在している時は何もしない
					tree = t;
				} else if (t == null) {
					if (tree.canWrite()) {
						// 存在しないときはディレクトリを生成
						tree = tree.createDirectory(d);
					} else {
						throw new IOException("can't create directory");
					}
				} else {
					throw new IOException("can't create directory, file with same name already exists");
				}
			}
		}
	}
	return tree;
}
 

/**
 * 指定したUriが存在する時にその下に入力用ファイルを生成して入出力用のファイルディスクリプタを返す
 * @param context
 * @param treeId
 * @param dirs
 * @param mime
 * @param name
 * @return
 * @throws UnsupportedOperationException
 * @throws FileNotFoundException
 * @throws IOException
 */
@NonNull
public static ParcelFileDescriptor getFd(
	@NonNull final Context context,
	final int treeId, @Nullable final String dirs,
	final String mime, final String name) throws IOException {

	if (BuildCheck.isLollipop()) {
		final DocumentFile tree = getDir(context, treeId, dirs);
		if (tree != null) {
			final DocumentFile file = tree.findFile(name);
			if (file != null) {
				if (file.isFile()) {
					return context.getContentResolver().openFileDescriptor(
						file.getUri(), "rw");
				} else {
					throw new IOException("directory with same name already exists");
				}
			} else {
				return context.getContentResolver().openFileDescriptor(
					tree.createFile(mime, name).getUri(), "rw");
			}
		} else {
			throw new FileNotFoundException("specific dir not found");
		}
	} else {
		throw new UnsupportedOperationException("should be API>=21");
	}
}
 

public static boolean writeBytes(Context context, byte[] data, String fileName, Uri rootUri, String... subDirs) {
    DocumentFile parent = getDirDocument(context, rootUri, subDirs);
    if (parent == null)
        return false;
    fileName = filenameFilter(Uri.decode(fileName));
    DocumentFile file = parent.findFile(fileName);
    return writeBytes(context, data, file.getUri());
}
 

public static byte[] readBytes(Context context, String fileName, DocumentFile root, String... subDirs) {
    DocumentFile parent = getDirDocument(root, subDirs);
    if (parent == null)
        return null;
    fileName = filenameFilter(Uri.decode(fileName));
    DocumentFile file = parent.findFile(fileName);
    if (file == null)
        return null;
    return readBytes(context, file.getUri());
}
 

public static boolean writeBytes(Context context, byte[] data, String fileName, Uri rootUri, String... subDirs) {
    DocumentFile parent = getDirDocument(context, rootUri, subDirs);
    if (parent == null)
        return false;
    fileName = filenameFilter(Uri.decode(fileName));
    DocumentFile file = parent.findFile(fileName);
    return writeBytes(context, data, file.getUri());
}
 

public static InputStream getFileInputSteam(Context context, String fileName, Uri rootUri, String... subDirs) {
    DocumentFile parent = getDirDocument(context, rootUri, subDirs);
    if (parent == null)
        return null;
    fileName = filenameFilter(Uri.decode(fileName));
    DocumentFile file = parent.findFile(fileName);
    if (file == null)
        return null;
    return getFileInputSteam(context, file.getUri());
}