獲取請求在 android 設備上不起作用，但它在我的電腦上運行

Question

我寫了這個簡單的獲取請求

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();
}

當我在我的電腦上測試它時它工作得很好但是當我在我的手機上測試它時它給了我以下異常

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 塊。

Answer 2

試試這個，而不是使用這么多 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();
  }

然后只需調用上面的方法並在需要時傳遞您的網址。

 String response =doGetRequest(yourUrl);