android - API.AI : How to stop AsyncTask on click of the AIButton?

Question

我在我的应用程序中使用 AIButton 并且我有一个 AsyncTask，它在单击 AIButton 并收到一些命令后执行，而 AsyncTask 有时执行时间太长。

这是我的代码:

final AIConfiguration config = new AIConfiguration("xxx",
                AIConfiguration.SupportedLanguages.English,
                AIConfiguration.RecognitionEngine.System);

listenButton = (AIButton) findViewById(R.id.micButton);

config.setRecognizerStartSound(getResources().openRawResourceFd(R.raw.test_start));
config.setRecognizerStopSound(getResources().openRawResourceFd(R.raw.test_stop));
config.setRecognizerCancelSound(getResources().openRawResourceFd(R.raw.test_cancel));

listenButton.initialize(config);
listenButton.setResultsListener(this);

这是 AsnycTask:

class translate extends AsyncTask<String, Void, String> {

    String translatedText = "";

    @Override
    protected void onPreExecute() {
        super.onPreExecute();
        loading.setMessage("Loading");
        loading.show();
    }

    @Override
    protected String doInBackground(String... params) {

        String text = params[0];
        String toBeConvertedIn = params[1];

        Log.d("TEXT", text);
        Log.d("TBCI", toBeConvertedIn);

        try {
            String encodedText = URLEncoder.encode(text, "UTF-8");
            HttpHandler httpHandler = new HttpHandler();
            String url = "https://translate.yandex.net/api/v1.5/tr.json/translate?key=xxxxxxx&text=" + encodedText + "&lang=" + toBeConvertedIn;
            String jsonStr = httpHandler.makeServiceCall(url);

            if (jsonStr != null) {
                Log.e(TAG, "Response from url: " + jsonStr);
                try {
                    JSONObject jsonObj = new JSONObject(jsonStr);
                    Log.d("jsonObj", String.valueOf(jsonObj));

                    JSONArray translatedTextObj = jsonObj.getJSONArray("text");

                    for (int i=0; i<translatedTextObj.length(); i++) {
                        translatedText = translatedTextObj.getString(i);
                        Log.d("translatedText", translatedText);
                    }

                } catch (JSONException e) {
                    Log.d(TAG, e.getMessage());
                }
            } else {
                Log.e(TAG, "Couldn't get json from server.");
            }

        } catch (UnsupportedEncodingException e) {
            Log.d(TAG, e.getMessage());
        }

        return translatedText;
    }

        @Override
        protected void onPostExecute(String s) {
            super.onPostExecute(s);
            hTV.setText(s);
            if (loading.isShowing()) {
                loading.dismiss();
            }
        }
    }

我在 onResult() 方法中调用上面给定的 AsyncTask，如下所示:

public void onResult(final AIResponse response) {

    runOnUiThread(new Runnable() {
        @Override
        public void run() {
            Log.d(TAG, "onResult");

            Log.i(TAG, "Received success response");

            // this is example how to get different parts of result object
            final Status status = response.getStatus();
            Log.i(TAG, "Status code: " + status.getCode());
            Log.i(TAG, "Status type: " + status.getErrorType());

            final Result result = response.getResult();
            Log.i(TAG, "Resolved query: " + result.getResolvedQuery());

            Log.i(TAG, "Action: " + result.getAction());
            final String speech = result.getFulfillment().getSpeech();

            final Metadata metadata = result.getMetadata();
            if (metadata != null) {
                Log.i(TAG, "Intent id: " + metadata.getIntentId());
                Log.i(TAG, "Intent name: " + metadata.getIntentName());
            }

            final HashMap<String, JsonElement> params = result.getParameters();
            if (params != null && !params.isEmpty()) {
                Log.i(TAG, "Parameters: ");
                for (final Map.Entry<String, JsonElement> entry : params.entrySet()) {

                    switch (response.getResult().getMetadata().getIntentName()) {
                        case "Translate":
                            if (entry.getValue() != null) {
                                if (entry.getKey().equals("translate")) {

                                    AlertDialog.Builder dialogBuilder = new AlertDialog.Builder(MainActivity.this);
                                    LayoutInflater inflater = MainActivity.this.getLayoutInflater();
                                    final View dialogView = inflater.inflate(R.layout.translate_alertdialog, null);
                                    dialogBuilder.setView(dialogView);

                                    final EditText textToTranslate = (EditText) dialogView.findViewById(R.id.text_to_translate);
                                    final AutoCompleteTextView chooseLanguage = (AutoCompleteTextView) dialogView.findViewById(R.id.choose_language);
                                    ArrayAdapter adapter = new ArrayAdapter<String>(MainActivity.this, android.R.layout.simple_spinner_item, languages);
                                    chooseLanguage.setAdapter(adapter);

                                    dialogBuilder.setTitle("What should I translate?");
                                    dialogBuilder.setPositiveButton("Translate", new DialogInterface.OnClickListener() {
                                        public void onClick(DialogInterface dialog, int whichButton) {
                                            if (!textToTranslate.getText().toString().isEmpty()) {
                                                if (!chooseLanguage.getText().toString().isEmpty()) {

                                                    switch (chooseLanguage.getText().toString().toLowerCase()) {
                                                        case "french":
                                                            new translate().execute(textToTranslate.getText().toString(), "az");
                                                            break;
                                                    }
                                                }
                                            }
                                        }
                                    });
                                    dialogBuilder.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
                                        public void onClick(DialogInterface dialog, int whichButton) {
                                            //pass

                                        }
                                    });
                                    AlertDialog b = dialogBuilder.create();
                                    b.show();
                                } else {
                                    Log.d("null", "No translate parameter");
                                }
                            } else {
                                Log.d("null", "No translate entry value");
                            }
                            break;
                    }
                }
            }
        }

    });

}

因此，我想要的是在单击 AIButton 时停止所有正在运行的 AsyncTask，以便停止先前的任务以执行新任务。如何做到这一点？

这里的问题是您不能在此处执行类似以下操作:listenButton.onClickListener()。

Answer 1

使用boolean cancel (boolean mayInterruptIfRunning) .

将 asyncTask 设为类变量。

AsyncTask translate_ = new translate();

然后原地这样调用。

translate_.execute(textToTranslate.getText().toString(), "az");

在按钮 onclick 中取消 asyncTask。

translate_.cancel(true);

然后在循环中检查任务是否已取消并设置中断。

for (int i=0; i<translatedTextObj.length(); i++) {
    translatedText = translatedTextObj.getString(i);
    Log.d("translatedText", translatedText);
    if(isCancelled())
        break;
}

这些问题还为如何选择执行此操作提供了更多多样性:

Android - Cancel AsyncTask Forcefully

How to stop asynctask thread in android?

在 backpress 上管理任务也是明智的。也许在暂停时取消 Activity 中的任务。

public void listenButtonOnClick(final View view) {
    // aiService.startListening();
    // add more details in here

    if (aiService != null) {
        switch (currentState) {
            case normal:
                aiService.startListening();
                break;
            case busy:
                aiService.cancel();
                translate_.cancel(true);
                break;
            default:
                aiService.stopListening();
                translate_.cancel(true);
                break;
}

或者在aiservice被取消或停止时取消任务。

@Override
public void onListeningStarted() {}

@Override
public void onListeningCanceled() {
    translate_.cancel(true);
}

@Override
public void onListeningFinished() {
    translate_.cancel(true);
}

还有其他管理方式，探索您的选择。好好看看at this以及上面链接的 SO 问题。

如果你看看the docs .

apiai-android-client/ailib/src/main/java/ai/api/ui/AIButton.java

@Override
protected void onClick(final View v) {
    super.onClick(v);

    if (aiService != null) {
        switch (currentState) {
            case normal:
                aiService.startListening();
                break;
            case busy:
                aiService.cancel();
                break;
            default:
                aiService.stopListening();
                break;
        }
    }

}

从our discussion就清楚了你正在为如何实现这个而苦苦挣扎。

请研究这个apiai-android-client/ Android SDK for api.ai/ Tutorial

回到基础。暂时忘记 ai.api 并学习基础知识。 Browse周围，​​阅读文档 Input Events阅读问题并应用编程原则。 例如:
Android button onclick override

除此之外，我无法为您提供更多帮助。