获取请求在 android 设备上不起作用，但它在我的电脑上运行

Question

我写了这个简单的获取请求

OkHttpClient httpClient = new OkHttpClient();
StringBuilder url = new StringBuilder(serverURL);

String result = "init";
if(params!=null && params.size()!=0){
    url = url.append("?"+prepareParam(params));
}
Request request = new Request.Builder().url(url.toString()).build();
Response response = null;
try {
response = httpClient.newCall(request).execute();
result = response.body().string();
} catch (IOException e) {
    e.printStackTrace();
}
catch (Exception e){
    e.printStackTrace();
}finally {
    response.close();
}

当我在我的电脑上测试它时它工作得很好但是当我在我的手机上测试它时它给了我以下异常

java.lang.NullPointerException: Attempt to invoke virtual method 'void okhttp3.Response.close()' on a null object reference

Answer 1

  try{
      response.close();
  }
  catch(NullPointerException e){
   e.printStackTrace();
  }

里面 finally 块。

Answer 2

试试这个，而不是使用这么多 try catch。

  OkHttpClient client = new OkHttpClient();
  String doGetRequest(String url) throws IOException {
    Request request = new Request.Builder()
        .url(url)
        .build();
    Response response = client.newCall(request).execute();
    return response.body().string();
  }

然后只需调用上面的方法并在需要时传递您的网址。

 String response =doGetRequest(yourUrl);