Question

I am currently working on an app and I need to be able to have the user control the app with nothing but their voice if necessary. I got a copy of some speech recognition code that apparently comes from android and I tried using it in my app. The code itself appears fairly simple but I need help understanding a few parts and implementing it on the app. I have ran the app on an android device and when I use the speech I get a list of phrases I possibly said. I want to be able to set up and activity where if one of the results is “close app” for example it will close the app. I thought I could set this up by doing an if statement for the results of the voice recognizer. Such as if results == close app then run the activity close. I don’t have any of this set up because I’m not sure how to code it exactly but I thought some of you would have some ideas.

package com.example.com.proto1;
import android.app.Activity;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.content.pm.ResolveInfo;
import android.os.Bundle;
import android.speech.RecognizerIntent;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ListView;

import java.util.ArrayList;
import java.util.List;


    /**
     * Sample code that invokes the speech recognition intent API.
     */
    public class VoiceRecognition extends Activity implements OnClickListener {

        private static final int VOICE_RECOGNITION_REQUEST_CODE = 1234;

        private ListView mList;

        /**
         * Called with the activity is first created.
         */
        @Override
        public void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);

            // Inflate our UI from its XML layout description.
            setContentView(R.layout.voice_recognition);

            // Get display items for later interaction
            Button speakButton = (Button) findViewById(R.id.btn_speak);

            mList = (ListView) findViewById(R.id.list);

            // Check to see if a recognition activity is present
            PackageManager pm = getPackageManager();
            List<ResolveInfo> activities = pm.queryIntentActivities(
                    new Intent(RecognizerIntent.ACTION_RECOGNIZE_SPEECH), 0);
            if (activities.size() != 0) {
                speakButton.setOnClickListener(this);
            } else {
                speakButton.setEnabled(false);
                speakButton.setText("Recognizer not present");
            }
        }

        /**
         * Handle the click on the start recognition button.
         */
        public void onClick(View v) {
            if (v.getId() == R.id.btn_speak) {
                startVoiceRecognitionActivity();
            }
        }

        /**
         * Fire an intent to start the speech recognition activity.
         */
        private void startVoiceRecognitionActivity() {
            Intent intent = new Intent(RecognizerIntent.ACTION_RECOGNIZE_SPEECH);
            intent.putExtra(RecognizerIntent.EXTRA_LANGUAGE_MODEL,
                    RecognizerIntent.LANGUAGE_MODEL_FREE_FORM);
            intent.putExtra(RecognizerIntent.EXTRA_PROMPT, "Speech recognition demo");
            startActivityForResult(intent, VOICE_RECOGNITION_REQUEST_CODE);
        }

        /**
         * Handle the results from the recognition activity.
         */
        @Override
        protected void onActivityResult(int requestCode, int resultCode, Intent data) {
            if (requestCode == VOICE_RECOGNITION_REQUEST_CODE && resultCode == RESULT_OK) {
                // Fill the list view with the strings the recognizer thought it could have heard
                ArrayList<String> matches = data.getStringArrayListExtra(
                        RecognizerIntent.EXTRA_RESULTS);
                mList.setAdapter(new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1,
                        matches));
            }

            super.onActivityResult(requestCode, resultCode, data);

        }
    }

Answer 1

This is results you have received from voice recognition activity:

ArrayList<String> matches = data.getStringArrayListExtra(RecognizerIntent.EXTRA_RESULTS);

matches is a list of possible texts that you have pronounced. If you want to close your app when some magic phrase was said you need something like this:

if (matches.contains("close")) {
     finish();
}