API.AI:如何在点击AIButton时停止AsyncTask？

Question

我正在AIButton我的应用程序中使用,我有一个AsyncTask在AIButton被点击后执行并接收一些命令并且AsyncTask有时需要太长时间才能执行.

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();
            }
        }
    }

我打电话上面给出AsyncTask的onResult()方法是这样的:

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,以便先前的任务停止以执行新任务.这该怎么做？

这里的问题是你不能做这样的事情:listenButton.onClickListener()这里.

Answer 1

尝试为您的 AIButton 设置 resultListener 并实现 onCancelled() 方法，从那里取消您的 AsyncTasks。

要将 AsyncTask 标记为需要停止，您应该调用

asyncTask.cancel(false);

在您的 AsyncTask 中，您必须通过调用定期检查它是否被取消isCancelled()。如果此方法返回 true，您应该停止执行。