Reconocimiento de Voz

Si en nuestra aplicación es necesario un buscador web, de aplicaciones o similares, podemos usar la opción de búsqueda por voz. Este tipo de búsqueda se puede configurar para que sea interna al teléfono, por ejemplo aplicaciones, o bien, en la web.

En el siguiente ejemplo veremos que está configurado para web y que el número máximo de elementos que se van a mostrar en la lista son 10. Esta configuración se puede hacer dinámica: en la búsqueda por web o aplicaciones se puede realizar mediante la inserción de un RadioButton en el código. En el segundo caso podemos poner un contador, un spinner con el número de búsquedas limitadas...

A continuación les dejo el código:

AndroidManifest.xml

<manifest xmlns:android="http://schemas.android.com/apk/res/android"

    package="com.example.blogvoicerecognition"

    android:versionCode="1"

    android:versionName="1.0" >

    <uses-sdk

        android:minSdkVersion="8"

        android:targetSdkVersion="15" />

    <uses-permission android:name="android.permission.INTERNET" />

    <application

        android:icon="@drawable/ic_launcher"

        android:label="@string/app_name"

        android:theme="@style/AppTheme" >

        <activity

            android:name=".VoiceRecognitionActivity"

            android:label="@string/title_activity_voice_recognition" >

            <intent-filter>

                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />

            </intent-filter>

        </activity>

    </application>

</manifest>

activity_voice_recognition.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    xmlns:tools="http://schemas.android.com/tools"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:orientation="vertical" >

    <EditText

        android:id="@+id/etTextHint"

        android:gravity="top"

        android:inputType="textMultiLine"

        android:lines="1"

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:text="Speech hint here"/>

    <Button

        android:id="@+id/btSpeak"

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:onClick="speak"

        android:padding="@dimen/padding_medium"

        android:text="Speak"

        tools:context=".VoiceRecognitionActivity" />

    <ListView

        android:id="@+id/lvTextMatches"

        android:layout_width="match_parent"

        android:layout_height="wrap_content" />

</LinearLayout>

VoiceRecognitionActivity.java

package com.example.blogvoicerecognition;

import java.util.ArrayList;

import java.util.List;

import android.app.Activity;

import android.app.SearchManager;

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.widget.ArrayAdapter;

import android.widget.Button;

import android.widget.EditText;

import android.widget.ListView;

import android.widget.Toast;

public class VoiceRecognitionActivity extends Activity {

private static final int VOICE_RECOGNITION_REQUEST_CODE = 0;

private static final int MATCHES = 10;

private EditText mEditText;

private ListView mListViewResults;

private Button mButtonSpeak;

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_voice_recognition);

mEditText = (EditText) findViewById(R.id.etTextHint);

mListViewResults = (ListView) findViewById(R.id.lvTextMatches);

mButtonSpeak = (Button) findViewById(R.id.btSpeak);

voiceRecognition();

}

public void voiceRecognition() {

// Check if voice recognition is present

PackageManager pm = getPackageManager();

List<ResolveInfo> activities = pm.queryIntentActivities(new Intent(

RecognizerIntent.ACTION_RECOGNIZE_SPEECH), 0);

if (activities.size() == 0) {

mButtonSpeak.setEnabled(false);

mButtonSpeak.setText("Voice recognizer not present");

Toast.makeText(this, "Voice recognizer not present",

Toast.LENGTH_SHORT).show();

}

}

public void speak(View view) {

Intent intent = new Intent(RecognizerIntent.ACTION_RECOGNIZE_SPEECH);

// Specify the calling package to identify your application

intent.putExtra(RecognizerIntent.EXTRA_CALLING_PACKAGE, getClass()

.getPackage().getName());

// Display an hint to the user about what he should say.

intent.putExtra(RecognizerIntent.EXTRA_PROMPT, mEditText.getText()

.toString());

// Given an hint to the recognizer about what the user is going to say

// There are two form of language model available

// 1.LANGUAGE_MODEL_WEB_SEARCH : For short phrases

// 2.LANGUAGE_MODEL_FREE_FORM : If not sure about the words or phrases

// and its domain.

intent.putExtra(RecognizerIntent.EXTRA_LANGUAGE_MODEL,

RecognizerIntent.LANGUAGE_MODEL_WEB_SEARCH);

// Specify how many results you want to receive. The results will be

// sorted where the first result is the one with higher confidence.

intent.putExtra(RecognizerIntent.EXTRA_MAX_RESULTS, MATCHES);

// Start the Voice recognizer activity for the result.

startActivityForResult(intent, VOICE_RECOGNITION_REQUEST_CODE);

}

@Override

protected void onActivityResult(int requestCode, int resultCode, Intent data) {

if (requestCode == VOICE_RECOGNITION_REQUEST_CODE)

// If Voice recognition is successful then it returns RESULT_OK

if (resultCode == RESULT_OK) {

ArrayList<String> textMatchList = data

.getStringArrayListExtra(RecognizerIntent.EXTRA_RESULTS);

if (!textMatchList.isEmpty()) {

// If first Match contains the 'search' word

// Then start web search.

if (textMatchList.get(0).contains("search")) {

String searchQuery = textMatchList.get(0);

searchQuery = searchQuery.replace("search", "");

Intent search = new Intent(Intent.ACTION_WEB_SEARCH);

search.putExtra(SearchManager.QUERY, searchQuery);

startActivity(search);

} else {

// populate the Matches

mListViewResults.setAdapter(new ArrayAdapter<String>(

this, android.R.layout.simple_list_item_1,

textMatchList));

}

}

// Result code for various error.

} else if (resultCode == RecognizerIntent.RESULT_AUDIO_ERROR) {

showToastMessage("Audio Error");

} else if (resultCode == RecognizerIntent.RESULT_CLIENT_ERROR) {

showToastMessage("Client Error");

} else if (resultCode == RecognizerIntent.RESULT_NETWORK_ERROR) {

showToastMessage("Network Error");

} else if (resultCode == RecognizerIntent.RESULT_NO_MATCH) {

showToastMessage("No Match");

} else if (resultCode == RecognizerIntent.RESULT_SERVER_ERROR) {

showToastMessage("Server Error");

}

super.onActivityResult(requestCode, resultCode, data);

}

/**

* Helper method to show the toast message

**/

void showToastMessage(String message) {

Toast.makeText(this, message, Toast.LENGTH_SHORT).show();

}

}

A continuación les dejo la imagen de la búsqueda de la palabra "Android":

It works!

Roger Sala,