如何在android中检查服务器连接是否可用？

ConnectivityManager connectivityManager = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo networkInfo = connectivityManager.getActiveNetworkInfo();
boolean isConnected = networkInfo != null && networkInfo.isConnected();

URL url = new URL("http://your-server-url.com");
HttpURLConnection connection = (HttpURLConnection) url.openConnection();
connection.setConnectTimeout(5000); // 设置连接超时时间为5秒
connection.setRequestMethod("GET"); // 设置请求方法为GET
int responseCode = connection.getResponseCode(); // 获取服务器的响应码
if (responseCode == HttpURLConnection.HTTP_OK) {
    // 服务器连接可用
} else {
    // 服务器连接不可用
}