I am developing a mobile application in java. And I'm trying to get a json response from the free JSONplaceholder service. I have already tried a hundred ways such as OkHttp, HttpURLConnection and so on. And when I try to get the response code or the response body, it gives me null. Please, help. Perhaps this screenshot will help to understand what the problem is.

CodePudding user response：

The problem was solved by setting the policy.

StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
StrictMode.setThreadPolicy(policy);