使用Java代码来比较Android客户端版本号

 public static int compareVersion(String version1, String version2) {
    if (version1.equals(version2)) {
      return 0;
    }

    String[] version1Array = version1.split("\\.");
    String[] version2Array = version2.split("\\.");

    int index = 0;
    int minLen = Math.min(version1Array.length, version2Array.length);
    int diff = 0;

    while (index < minLen && (diff = Integer.parseInt(version1Array[index]) - Integer.parseInt(version2Array[index])) == 0) {
      index ++;
    }

    if (diff == 0) {
      for (int i = index; i < version1Array.length; i ++) {
        if (Integer.parseInt(version1Array[i]) > 0) {
          return 1;
        }
      }

      for (int i = index; i < version2Array.length; i ++) {
        if (Integer.parseInt(version2Array[i]) > 0) {
          return -1;
        }
      }

      return 0;
    } else {
      return diff > 0 ? 1 : -1;
    }
  }