Dialogflow聊天机器人输出为语音

Question

我在Android Studio上的对话流聊天机器人项目将聊天机器人的输出显示为文本。但是我想要文本和语音输出，或者只是语音输出。

我不知道该怎么做。我知道这很简单，但是我不是Java专家。

这是Java文件：

package com.assisto.www.astria;

import android.content.ActivityNotFoundException;
import android.content.Intent;
import android.os.AsyncTask;
import android.os.Build;
import android.os.Bundle;
import android.speech.RecognizerIntent;
import android.speech.SpeechRecognizer;
import android.speech.tts.TextToSpeech;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.ImageButton;
import android.widget.TextView;
import android.widget.Toast;

import org.json.JSONArray;
import org.json.JSONObject;

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.UnsupportedEncodingException;
import java.net.URL;
import java.net.URLConnection;
import java.util.ArrayList;
import java.util.Locale;

public class MainActivity extends AppCompatActivity {


    private ImageButton imagebutton2;

    private final int REQ_CODE_SPEECH_INPUT = 100;
    ImageButton btnSpeak;
    TextView txtSpeechInput, outputText;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        imagebutton2 = (ImageButton) findViewById(R.id.imagebutton2);
        btnSpeak = (ImageButton) findViewById(R.id.btnSpeak);
        txtSpeechInput = (TextView) findViewById(R.id.txtSpeechInput);
        outputText = (TextView) findViewById(R.id.outputTex);

        imagebutton2.setOnClickListener(new View.OnClickListener(){
            @Override
            public void onClick(View V){
                OpenActivity2();
            }



                                        });


        btnSpeak.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                promptSpeechInput();
            }
        });




    }


    public void OpenActivity2(){


        Intent intent= new Intent(this, Main2Activity.class);
        startActivity(intent);
    }
















    /**
     * Showing google speech input dialog
     */
    private void promptSpeechInput() {

        Intent intent = new Intent(RecognizerIntent.ACTION_RECOGNIZE_SPEECH);
        intent.putExtra(RecognizerIntent.EXTRA_LANGUAGE_MODEL,
                RecognizerIntent.LANGUAGE_MODEL_FREE_FORM);
        // intent.putExtra(RecognizerIntent.EXTRA_LANGUAGE, Locale.getDefault());
        intent.putExtra(RecognizerIntent.EXTRA_PROMPT,
                "Say Something");
        try {
            startActivityForResult(intent, REQ_CODE_SPEECH_INPUT);
        } catch (ActivityNotFoundException a) {
            Toast.makeText(getApplicationContext(),
                    "orry! Your device doesn\\'t support speech input",
                    Toast.LENGTH_SHORT).show();
        }
    }






    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);

        switch (requestCode) {
            case REQ_CODE_SPEECH_INPUT: {
                if (resultCode == RESULT_OK && null != data) {

                    ArrayList<String> result = data
                            .getStringArrayListExtra(RecognizerIntent.EXTRA_RESULTS);
                    String userQuery=result.get(0);
                    txtSpeechInput.setText(userQuery);
                    RetrieveFeedTask task=new RetrieveFeedTask();
                    task.execute(userQuery);


                }
                break;
            }

        }
    }









    // Create GetText Metod
    public String GetText(String query) throws UnsupportedEncodingException {

        String text = "";
        BufferedReader reader = null;

        // Send data
        try {

            // Defined URL  where to send data
           URL url=new URL("https://api.dialogflow.com/v1/query?v=20150910");

            // Send POST data request

            URLConnection conn = url.openConnection();
            conn.setDoOutput(true);
            conn.setDoInput(true);

            conn.setRequestProperty("Authorization", "Bearer 19b7b9bc18b949d09d9232ac11b8d33d");
            conn.setRequestProperty("Content-Type", "application/json");

            //Create JSONObject here
            JSONObject jsonParam = new JSONObject();
            JSONArray queryArray = new JSONArray();
            queryArray.put(query);
            jsonParam.put("query", queryArray);
//            jsonParam.put("name", "order a medium pizza");
            jsonParam.put("lang", "en");
            jsonParam.put("sessionId", "1234567890");


            OutputStreamWriter wr = new OutputStreamWriter(conn.getOutputStream());
            Log.d("karma", "after conversion is " + jsonParam.toString());
            wr.write(jsonParam.toString());
            wr.flush();
            Log.d("karma", "json is " + jsonParam);

            // Get the server response

            reader = new BufferedReader(new InputStreamReader(conn.getInputStream()));
            StringBuilder sb = new StringBuilder();
            String line = null;


            // Read Server Response
            while ((line = reader.readLine()) != null) {
                // Append server response in string
                sb.append(line + "\n");
            }


            text = sb.toString();



            JSONObject object1 = new JSONObject(text);
            JSONObject object = object1.getJSONObject("result");
            JSONObject fulfillment = null;
            String speech = null;
//            if (object.has("fulfillment")) {
            fulfillment = object.getJSONObject("fulfillment");
//                if (fulfillment.has("speech")) {
            speech = fulfillment.optString("speech");
//                }
//            }


            Log.d("karma ", "response is " + text);
            return speech;

        } catch (Exception ex) {
            Log.d("karma", "exception at last " + ex);
        } finally {
            try {

                reader.close();
            } catch (Exception ex) {
            }
        }

        return null;
    }


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

        @Override
        protected String doInBackground(String... voids) {
            String s = null;
            try {

                s = GetText(voids[0]);


            } catch (UnsupportedEncodingException e) {
                e.printStackTrace();
                Log.d("karma", "Exception occurred " + e);
            }

            return s;
        }

        @Override
        protected void onPostExecute(String s) {
            super.onPostExecute(s);
            outputText.setText(s);

        }
    }





}