RTEditor-Demo/src/main/java/com/onegravity/rteditor/demo/FileHelper.java
public static boolean pickDirectory(Activity activity, File startPath, int requestCode) {
        PackageManager packageMgr = activity.getPackageManager();
        for (String[] intent : PICK_DIRECTORY_INTENTS) {
            String intentAction = intent[0];
            String uriPrefix = intent[1];
            Intent startIntent = new Intent(intentAction)
                    .putExtra("org.openintents.extra.TITLE", activity.getString(R.string.save_as))
                    .setData(Uri.parse(uriPrefix + startPath.getPath()));

            try {
                if (startIntent.resolveActivity(packageMgr) != null) {
                    activity.startActivityForResult(startIntent, requestCode);
                    return true;
                }
            } catch (ActivityNotFoundException e) {
                showNoFilePickerError(activity, e);
            }
        }

        return false;
    }
public static boolean pickDirectory(Activity activity, File startPath, int requestCode) {
        PackageManager packageMgr = activity.getPackageManager();
        for (String[] intent : PICK_DIRECTORY_INTENTS) {
            String intentAction = intent[0];
            String uriPrefix = intent[1];
            Intent startIntent = new Intent(intentAction)
                    .putExtra("org.openintents.extra.TITLE", activity.getString(R.string.save_as))
                    .setData(Uri.parse(uriPrefix + startPath.getPath()));

            try {
                if (startIntent.resolveActivity(packageMgr) != null) {
                    activity.startActivityForResult(startIntent, requestCode);
                    return true;
                }
            } catch (ActivityNotFoundException e) {
                showNoFilePickerError(activity, e);
            }
        }

        return false;
    }
Tries to open a known file browsers to pick a directory.

@return True if a filebrowser has been found (the result will be in the onActivityResult), False otherwise