为什么onPostExecute可以在AsyncTask中的doInBackground之前运行?

问题描述

当我调试我的应用程序时，我看到onPostExecute在onPreExecute之后开始，并且仅在doInBackground方法完成后才开始运行，因此我在UI上没有结果.为什么会这样呢? AsyncTask代码:

When I debug my app I see that onPostExecute starts after onPreExecute and only when it is finished doInBackground method start running, so I don't have results on UI. Why it could be? AsyncTask code:

class TranslateYandex extends AsyncTask<Void, Void, Void> {
    String translate = "";
    //        YandexTranslation yandexTranslation;
    @Override
    protected void onPreExecute() {
        super.onPreExecute();
        enterWord.setEnabled(false);
        getTranslateButton.setEnabled(false);
        translate = enterWord.getText().toString();
    }
    @Override
    protected Void doInBackground(Void... voids) {
        Retrofit retrofit = new Retrofit.Builder()
                .baseUrl("https://translate.yandex.net")
                .addConverterFactory(GsonConverterFactory.create())
                .build();
        YandexService service = retrofit.create(YandexService.class);

        Call<YandexTranslation> call = service.getTranslation(translate, API_KEY, LANG);
        call.enqueue(new Callback<YandexTranslation>() {
            @Override
            public void onResponse(Call<YandexTranslation> call, Response<YandexTranslation> response) {
                if (response.body() != null){
                    Log.i("Response", response.body().getTranslation().get(0));
                    translation = response.body().getTranslation().get(0);
                    int donothing = 1;
                }

                else {
                    Log.i("Response", " is null");
                   }
            }

            @Override
            public void onFailure(Call<YandexTranslation> call, Throwable t) {
                Log.i("Failure", t.toString());
            }
        });

        return null;
    }

    protected void onPostExecute(Void voids) {
        enterWord.setEnabled(true);
        getTranslateButton.setEnabled(true);
        enterTranslation.setText(translation);
    }
}

推荐答案

我认为没有必要使用异步任务，只需创建如下所示的方法即可，我已经证明您将实现您想要的.

i think there is no need to use an async task simply create a method like below i have demonstrated you will achieve what you want.

public void methodName(){

    enterWord.setEnabled(false);
    getTranslateButton.setEnabled(false);
    translate = enterWord.getText().toString();

Retrofit retrofit = new Retrofit.Builder()
            .baseUrl("https://translate.yandex.net")
            .addConverterFactory(GsonConverterFactory.create())
            .build();
    YandexService service = retrofit.create(YandexService.class);

    Call<YandexTranslation> call = service.getTranslation(translate, API_KEY, LANG);
    call.enqueue(new Callback<YandexTranslation>() {
        @Override
        public void onResponse(Call<YandexTranslation> call, Response<YandexTranslation> response) {
            if (response.body() != null){
                Log.i("Response", response.body().getTranslation().get(0));
                translation = response.body().getTranslation().get(0);
                int donothing = 1;
            }

            else {
                Log.i("Response", " is null");
               }
        }

        @Override
        public void onFailure(Call<YandexTranslation> call, Throwable t) {
            Log.i("Failure", t.toString());
        }


        /* Here i am adding this code global because it seems you do not have any specific condition for translation object in onResponse. You can also write this in onResponse with specific condition*/
        enterWord.setEnabled(true);
        getTranslateButton.setEnabled(true);
        enterTranslation.setText(translation);
    });
}

现在，只需在所需的位置调用此函数即可.

Now Simply call this function from where you want.

如果您遇到此解决方案的任何问题，请告诉我.

Let me know if you are facing any issue with this solution.

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If you can resolve your query with this solution kindly mark this as answer.

快乐编码！

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