屏幕关闭时如何在android中发出http请求？答案

【问题标题】：How to make an http request in android when screen is off?屏幕关闭时如何在android中发出http请求？
【发布时间】：2020-10-05 10:19:07
【问题描述】：

当屏幕关闭时，我在发出 HTTP 请求时遇到了很多麻烦。我目前正在通过以下方式使用 HttpUrlConnection：

class HttpPostRequest extends AsyncTask<String, Void, String> {

     private String httpResponse = null;

     public String getResponse() {
         return httpResponse;
     }

     @Override
     protected String doInBackground(String... params) {
        try {

                URL url = new URL(params[0]);
                HttpURLConnection connection = (HttpURLConnection) url.openConnection();

                connection.setRequestMethod("POST");
                connection.setRequestProperty("Content-Type", "application/json; charset=UTF-8");

                connection.setDoOutput(true);
                BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(connection.getOutputStream()));
                writer.write(params[1]);
                writer.flush();
                writer.close();

                connection.connect();

                Log.e("Response", connection.getResponseCode() + "");
                Log.e("Url", connection.getRequestMethod());

            if (connection.getResponseCode() == HttpURLConnection.HTTP_OK) { //success
                BufferedReader in = new BufferedReader(new InputStreamReader(
                        connection.getInputStream()));
                String inputLine;
                StringBuffer response = new StringBuffer();

                while ((inputLine = in.readLine()) != null) {
                    response.append(inputLine);
                }
                in.close();
                connection.disconnect();

                // print result
               return response.toString();
            }

        } catch (Exception e) {
            Log.e(e.toString(), "Something with request");
            return "";
        }
        return "";
    }
}

但是，虽然当我正在编程的应用程序在屏幕上时它可以正常工作，但当屏幕关闭时它无法正常工作。很高兴听到社区的建议。谢谢！

【问题讨论】：

它是如何工作的？你有例外吗？

标签： android android-studio http httpurlconnection

【解决方案1】：

使用 Thread 代替 AsyncTask 例如

Thread t = new Thread({
   public void run(){
      .....
      your code
      } 
   });
t.start();

【讨论】：

【解决方案2】：

如果你想在app后台调用http请求，你可以使用WorkManager。更多信息，您可以访问https://developer.android.com/topic/libraries/architecture/workmanager

【讨论】：