public static String bundleToString(Bundle bundle) {
    if (bundle == null) {
      return "null";
    }

    StringBuilder b = new StringBuilder(128);
    b.append("Bundle[{");
    bundleToShortString(bundle, b);
    b.append("}]");
    return b.toString();
  }
Bundle object to string, the string would be in the format of "Bundle[{...}]".
xlog/src/main/java/com/elvishew/xlog/internal/util/ObjectToStringUtil.java