OkHttp的enqueue方法是否实现了AsyncTaskLoader？

Question

我对 android 编程还很陌生。我已经编写了一个代码来使用 OkHttp 库执行 API 查询。

我的问题是，一旦 OkHttp 的入队过程开始，用户立即旋转 phone，从而销毁并重新启动 activity，是否会导致第二次入队过程发生，从而导致代码并行执行 2 OkHttp Api 查询？

我知道如果我们将 httpUrlConnections 与 AsyncTask（而不是 OkHttp）一起使用，这是一个已知问题。我们可以使用 AsyncTaskLoader 绕过它，它的生命周期与我们的 MainActivity 是分开的。但我只是想知道 OkHttp 是否也考虑到了这一点。

谢谢！如果有帮助的话，我的代码示例如下所示。

private void performApiCall(String url) {
    mLoadingPb.setVisibility(View.VISIBLE);
    // is network available?
    if (NetworkUtility.isNetworkAvailable(MainActivity.this)) {
        // create new OkHttp client
        OkHttpClient client = new OkHttpClient();
        Request request = new Request.Builder().url(url).build(); // building the request
        Call call = client.newCall(request);


        // Asynchronous task
        call.enqueue(new Callback() {
            @Override
            public void onFailure(Call call, IOException e) {
                alertUserAboutError();

                runOnUiThread(new Runnable() {
                    @Override
                    public void run() {
                        mLoadingPb.setVisibility(View.INVISIBLE);
                    }
                });
            }

            @Override
            public void onResponse(Call call, Response response) throws IOException {
                Log.d(TAG, "OkHttp, onResponse received");
                // perform data download
                if (response.isSuccessful()) {
                    runOnUiThread(new Runnable() {
                        @Override
                        public void run() {
                            mLoadingPb.setVisibility(View.INVISIBLE);
                        }
                    });

                    String jsonData = response.body().string(); // this is the raw data in json format
                    Log.v(TAG, jsonData);

                    try {
                        if (mMovieData == null) {
                            saveMovieData(jsonData);


                            runOnUiThread(new Runnable() {
                                @Override
                                public void run() {
                                    mCurrentPage++;
                                    setRecyclerView();
                                    Log.d(TAG, "OkHttpCall completed");
                                }
                            });
                        } else {
                            appendMovieData(jsonData);

                            runOnUiThread(new Runnable() {
                                @Override
                                public void run() {

                                    mCurrentPage++;
                                    updateRecyclerView();
                                    Log.d(TAG, "OkHttpCall completed");
                                }
                            });
                        }


                    } catch (JSONException e) {
                        e.printStackTrace();
                        Log.e(TAG, "Exception caught: ", e);
                    }
                } else {
                    runOnUiThread(new Runnable() {
                        @Override
                        public void run() {
                            mLoadingPb.setVisibility(View.INVISIBLE);
                        }
                    });

                    alertUserAboutError();
                }

            }
        });
    } else {
        runOnUiThread(new Runnable() {
            @Override
            public void run() {
                mLoadingPb.setVisibility(View.INVISIBLE);
            }
        });

        alertUserNetworkUnavailable();
    }
}

Answer 1

My question is, once the OkHttp's enqueue process has started, and the user immediately rotates the phone, thereby destroying and restarting the activity, does that cause a second enqueue process to occur, thereby causing the code to perform 2 OkHttp Api query in parallel?

如果您的 activity 在创建时自动调用 enqueue()，那么可以。

And we can bypass it by using an AsyncTaskLoader, which has a separate life cycle from our MainActivity.

请注意，架构组件对视图模型的支持和 LiveData 是 Google 解决加载程序试图解决的问题的当前方向。

OkHttp的enqueue方法是否实现了AsyncTaskLoader？

Does OkHttp's enqueue method implement AsyncTaskLoader?

android

asynctaskloader

okhttp