如何等待 Okhttp 调用的结果以在测试中使用它？

Question

我创建了一种方法来检查我的应用程序是否能够使用 OkHttp 连接到我的服务器。

这是我的测试class:

public class NetworkTest {

static boolean resultWeb = false;

public static boolean pingTestWeb() {

    OkHttpClient client = new OkHttpClient();

    Request request = new Request.Builder()
            .url("http://www.google.com")//My server address will go here
            .build();

    client.newCall(request).enqueue(new Callback() {

        @Override
        public void onFailure(Request request, IOException e) {
            resultWeb = false;
            Log.i("Error","Failed to connect: "+e.getMessage());
        }

        @Override
        public void onResponse(Response response) throws IOException {

            Log.i("Success","Success: "+response.code());
            if (response.code() == 200) {
                resulWeb = true;
            }
        }
    });

    return resultWeb;
}

这是我在 OnCreate() 上对 activity 进行测试的地方：

if (NetworkTest.pingTestWeb()) {

        // Do something if true...

    } else {

        // Do something if false, like showing an AlertDialog...
    }

问题是，我的 pingTestWeb 的默认超时时间为 10000 毫秒，如何让 activity 只有在 pingTestWeb 为 false 时才创建 AlertDialog？因为它不等待响应。

Answer 1

我认为这里可能发生的情况是您正在异步执行 OkHttp 调用，因此您在任务完成之前点击了 return 语句。为了测试，是否可以同步调用 OkHttp？您可以使用如下所示的 response.isSuccessful 处理 success/failure 案例。

   private final OkHttpClient client = new OkHttpClient();

   public void run() throws Exception {
       Request request = new Request.Builder()
           .url("your_url_here")
           .build();

       Response response = client.newCall(request).execute();
       if(response.isSuccessful()){
           return true;             
        }else return false;

    }

Answer 2

你也可以使用 CountDownLatch，这样你就可以在你的测试中加入异步：

public class NetworkTest {

static boolean resultWeb = false;

public static boolean pingTestWeb() {

    OkHttpClient client = new OkHttpClient();

    Request request = new Request.Builder()
            .url("http://www.google.com")//My server address will go here
            .build();

    CountDownLatch countDownLatch = new CountDownLatch(1);
    client.newCall(request).enqueue(new Callback() {

        @Override
        public void onFailure(Request request, IOException e) {
            resultWeb = false;
            Log.i("Error","Failed to connect: "+e.getMessage());
            countDownLatch.countDown();
        }

        @Override
        public void onResponse(Response response) throws IOException {

            Log.i("Success","Success: "+response.code());
            if (response.code() == 200) {
                resulWeb = true;
            }
            countDownLatch.countDown();
        }
    });

    countDownLatch.await();
    return resultWeb;
}

如何等待 Okhttp 调用的结果以在测试中使用它？

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