Voice Recognition & Text to speech

How to implement voice recognition

With your blank project setup, you should have an AndroidManifest file like the following

<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android"       package="com.jameselsey"       android:versionCode="1"       android:versionName="1.0">     <application android:label="VoiceRecognitionDemo" android:icon="@drawable/icon"             android:debuggable="true">         <activity android:name=".VoiceRecognitionDemo"                   android:label="@string/app_name">             <intent-filter>                 <action android:name="android.intent.action.MAIN" />                 <category android:name="android.intent.category.LAUNCHER" />             </intent-filter>         </activity>     </application> </manifest>

And have the following in res/layout/voice_recog.xml :

<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"     android:layout_width="fill_parent"     android:layout_height="fill_parent"     android:orientation="vertical">       <TextView         android:layout_width="fill_parent"         android:layout_height="wrap_content"         android:paddingBottom="4dip"         android:text="Click the button and start speaking" />       <Button android:id="@+id/speakButton"         android:layout_width="fill_parent"         android:onClick="speakButtonClicked"         android:layout_height="wrap_content"         android:text="Click Me!" />       <ListView android:id="@+id/list"         android:layout_width="fill_parent"         android:layout_height="0dip"         android:layout_weight="1" />    </LinearLayout>

And finally, this in your res/layout/main.xml :

<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"     android:orientation="vertical"     android:layout_width="fill_parent"     android:layout_height="fill_parent"     > <TextView     android:layout_width="fill_parent"     android:layout_height="wrap_content"     android:text="VoiceRecognition Demo!"     /> </LinearLayout>

So thats your layout and configuration sorted. It will provide us with a button to start the voice recognition, and a list to present any words which the voice recognition service thought it heard. Lets now step through the actual activity and see how this works.
You should copy this into your activity :

package com.jameselsey;   import android.app.Activity; import android.os.Bundle; import android.content.Intent; import android.content.pm.PackageManager; import android.content.pm.ResolveInfo; import android.speech.RecognizerIntent; import android.view.View; import android.widget.ArrayAdapter; import android.widget.Button; import android.widget.ListView; import java.util.ArrayList; import java.util.List;   /**  * A very simple application to handle Voice Recognition intents  * and display the results  */ public class VoiceRecognitionDemo extends Activity {       private static final int REQUEST_CODE = 1234;     private ListView wordsList;       /**      * Called with the activity is first created.      */     @Override     public void onCreate(Bundle savedInstanceState)     {         super.onCreate(savedInstanceState);         setContentView(R.layout.voice_recog);           Button speakButton = (Button) findViewById(R.id.speakButton);           wordsList = (ListView) findViewById(R.id.list);           // Disable button if no recognition service is present         PackageManager pm = getPackageManager();         List<ResolveInfo> activities = pm.queryIntentActivities(                 new Intent(RecognizerIntent.ACTION_RECOGNIZE_SPEECH), 0);         if (activities.size() == 0)         {             speakButton.setEnabled(false);             speakButton.setText("Recognizer not present");         }     }       /**      * Handle the action of the button being clicked      */     public void speakButtonClicked(View v)     {         startVoiceRecognitionActivity();     }       /**      * Fire an intent to start the voice 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, "Voice recognition Demo...");         startActivityForResult(intent, REQUEST_CODE);     }       /**      * Handle the results from the voice recognition activity.      */     @Override     protected void onActivityResult(int requestCode, int resultCode, Intent data)     {         if (requestCode == REQUEST_CODE && resultCode == RESULT_OK)         {             // Populate the wordsList with the String values the recognition engine thought it heard             ArrayList<String> matches = data.getStringArrayListExtra(                     RecognizerIntent.EXTRA_RESULTS);             wordsList.setAdapter(new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1,                     matches));         }         super.onActivityResult(requestCode, resultCode, data);     } }

 

Text to speech simple example

package com.aviyehuda.android.text2speech;

import android.app.Activity;
import android.os.Bundle;
import android.speech.tts.TextToSpeech;
import android.speech.tts.TextToSpeech.OnInitListener;

public class Text2SpeechTest extends Activity implements OnInitListener {
 
 TextToSpeech talker;
 
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        talker = new TextToSpeech(this, this);
    }
    
    public void say(String text2say){
     talker.speak(text2say, TextToSpeech.QUEUE_FLUSH, null);
    }

 @Override
 public void onInit(int status) {
  
  say("Hello World");
  
 }
 
 @Override
 public void onDestroy() {
  if (talker != null) {
   talker.stop();
   talker.shutdown();
  }

  super.onDestroy();
 }
}