PreKeyUtil.java 文件源码

private static synchronized int getNextPreKeyId(Context context) {
  try {
    File nextFile = new File(getPreKeysDirectory(context), PreKeyIndex.FILE_NAME);

    if (!nextFile.exists()) {
      return Util.getSecureRandom().nextInt(Medium.MAX_VALUE);
    } else {
      InputStreamReader reader = new InputStreamReader(new FileInputStream(nextFile));
      PreKeyIndex       index  = JsonUtils.fromJson(reader, PreKeyIndex.class);
      reader.close();
      return index.nextPreKeyId;
    }
  } catch (IOException e) {
    Log.w("PreKeyUtil", e);
    return Util.getSecureRandom().nextInt(Medium.MAX_VALUE);
  }
}