Wednesday, April 24, 2013

Android Voice Recognition


1.) Create a new project by File-> New -> Android Project name it VoiceRecognitionActivity.
2.) Write following into main.xml:

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<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="@string/etSearchHint"/>
     
    <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="@string/btSpeak"
        tools:context=".VoiceRecognitionActivity" />
 
    <Spinner
        android:id="@+id/sNoOfMatches"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:entries="@array/saNoOfMatches"
        android:prompt="@string/sNoOfMatches"/>
     
    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="@string/tvTextMatches"
        android:textStyle="bold" />
 
    <ListView
        android:id="@+id/lvTextMatches"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />
 
</LinearLayout>
3.) Write following into strings.xml:
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<?xml version="1.0" encoding="utf-8"?>
<resources>
 
    <string name="app_name">VoiceRecognitionActivity</string>
    <string name="hello_world">Hello world!</string>
    <string name="menu_settings">Settings</string>
    <string name="btSpeak">Speak</string>
    <string name="tvTextMatches">Text Matches</string>
    <string name="sNoOfMatches">No of Matches</string>
    <string name="etSearchHint">Speech hint here</string>
    <string-array name="saNoOfMatches">
        <item>1</item>
        <item>2</item>
        <item>3</item>
        <item>4</item>
        <item>5</item>
        <item>6</item>
        <item>7</item>
        <item>8</item>
        <item>9</item>
        <item>10</item>
    </string-array>
</resources>
4.) Create and write following into values/dimens.xml:
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<resources>
 
    <dimen name="padding_small">8dp</dimen>
    <dimen name="padding_medium">8dp</dimen>
    <dimen name="padding_large">16dp</dimen>
 
</resources>
5.) Write following into manifest file:
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<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.voicerecognitionactivity"
    android:versionCode="1"
    android:versionName="1.0" >
 
    <uses-sdk
        android:minSdkVersion="16"
        android:targetSdkVersion="16" />
    <uses-permission android:name="android.permission.INTERNET" />
    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.example.voicerecognitionactivity.VoiceRecognitionActivity"
            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>
6.) Run for output.
Steps:
1.) Create a project named VoiceRecognitionActivity and set the information as stated in the image.
Build Target: Android 4.0
Application Name: VoiceRecognitionActivity
Package Name: com. example. VoiceRecognitionActivity
Activity Name: VoiceRecognitionActivity
Min SDK Version: 4.0
2.) Open VoiceRecognitionActivity.java file and write following code there:
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package com.example.voicerecognitionactivity;
 
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.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.Spinner;
import android.widget.Toast;
 
public class VoiceRecognitionActivity extends Activity {
    private static final int VOICE_RECOGNITION_REQUEST_CODE = 1001;
 
    private EditText metTextHint;
    private ListView mlvTextMatches;
    private Spinner msTextMatches;
    private Button mbtSpeak;
 
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        metTextHint = (EditText) findViewById(R.id.etTextHint);
        mlvTextMatches = (ListView) findViewById(R.id.lvTextMatches);
        msTextMatches = (Spinner) findViewById(R.id.sNoOfMatches);
        mbtSpeak = (Button) findViewById(R.id.btSpeak);
    }
 
    public void checkVoiceRecognition() {
        // 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) {
            mbtSpeak.setEnabled(false);
            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, metTextHint.getText()
                .toString());
 
        // Given an hint to the recognizer about what the user is going to say
        intent.putExtra(RecognizerIntent.EXTRA_LANGUAGE_MODEL,
                RecognizerIntent.LANGUAGE_MODEL_WEB_SEARCH);
 
        // If number of Matches is not selected then return show toast message
        if (msTextMatches.getSelectedItemPosition() == AdapterView.INVALID_POSITION) {
            Toast.makeText(this, "Please select No. of Matches from spinner",
                    Toast.LENGTH_SHORT).show();
            return;
        }
 
        int noOfMatches = Integer.parseInt(msTextMatches.getSelectedItem()
                .toString());
        // 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, noOfMatches);
 
        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).replace("search",
                        " ");
                        Intent search = new Intent(Intent.ACTION_WEB_SEARCH);
                        search.putExtra(SearchManager.QUERY, searchQuery);
                        startActivity(search);
                    } else {
                        // populate the Matches
                        mlvTextMatches
                        .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);
    }
    void showToastMessage(String message){
        Toast.makeText(this, message, Toast.LENGTH_SHORT).show();
    }
}
3.) Compile and build the project.
Output
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