android - Retrofit 2 如何多次发出同一个请求

Question

public void makeGetRequest() {


    Retrofit.Builder builder = new Retrofit.Builder().baseUrl("https://desolate-beach-17272.herokuapp.com");
    Retrofit retrofit = builder.build();


    RetrofitInterface retrofitInterface = retrofit.create(RetrofitInterface.class);


    Call<ResponseBody> call = retrofitInterface.downloadFileByUrl("downloadFile/beach.jpg");


    call.enqueue(new Callback<ResponseBody>() {
        @SuppressLint("StaticFieldLeak")

        // returns the response if everything is okay
        @Override
        public void onResponse(Call<ResponseBody> call, final Response<ResponseBody> response) {

            try {
                Log.d("Success" , " " + response.body().bytes().length);
            } catch (IOException e) {
                e.printStackTrace();
            }
        }


        @Override
        public void onFailure(Call<ResponseBody> call, Throwable t) {
            Log.d("FAIL", "oops");

        }
    });

我有这段代码，它使用 async 方法向我的服务器发出 get request。我想要的是多次发出相同的请求。例如，我想发出 100 次 get request。如果可能，我不想使用可观察对象或其他外部库。有没有人可以帮我解决这个问题？

Answer 1

您可以多次调用，只需查看下面我为此目的使用方法的代码。在对从服务器获取的数据执行操作后的 onResponse 方法中，您可以通过使用变量 sizeOfCall 并递减它直到它等于零来再次调用同一 API。下面是它的完整代码。

public class RequestActivity extends AppCompatActivity {

    int sizeOfCall = 100;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_request);

      callAPI();
    }

 private void callAPI(){
    Retrofit.Builder builder = new Retrofit.Builder().baseUrl("https://desolate-beach-17272.herokuapp.com");
    Retrofit retrofit = builder.build();
    RetrofitInterface retrofitInterface = retrofit.create(RetrofitInterface.class);
    Call<ResponseBody> call = retrofitInterface.downloadFileByUrl("downloadFile/beach.jpg");

    // Call API
    makeGetRequest(call);
}

 private void makeGetRequest(Call<ResponseBody> call) {

call.enqueue(new Callback<ResponseBody>() {

   @SuppressLint("StaticFieldLeak")

    // returns the response if everything is okay
    @Override
    public void onResponse(Call<ResponseBody> call, final Response<ResponseBody> response) {

        try {
            Log.d("Success", " " + response.body().bytes().length);
            // Perform your operations here and call API againg after that
            sizeOfCall--;
            if (sizeOfCall > 0) {
                callAPI();
                } else {
                 // No more calls needed
                 }
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }


            @Override
            public void onFailure(Call<ResponseBody> call, Throwable t) {
                Log.d("FAIL", "oops");

            }
        });
    }
}