api23 android permission

gistfile1.txt

  /**
   * Checks whether it is necessary to ask for permission to read storage. If necessary, it also
   * requests permission.
   *
   * @return true if a permission request is made. False if it is not necessary.
   */
  @TargetApi(23)
  private boolean maybeRequestPermission() {
    if (requiresPermission(contentUri)) {
      requestPermissions(new String[] {permission.READ_EXTERNAL_STORAGE}, 0);
      return true;
    } else {
      return false;
    }
  }

  @TargetApi(23)
  private boolean requiresPermission(Uri uri) {
    return Util.SDK_INT >= 23
        && Util.isLocalFileUri(uri)
        && checkSelfPermission(permission.READ_EXTERNAL_STORAGE)
            != PackageManager.PERMISSION_GRANTED;
  }

copy from the demo of exoplayer