Android For Beginner

1.) Create a new project by File-> New -> Android Project name it VoiceRecognitionActivity.

2.) Write following into main.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="@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:

<?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:

<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:

<?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:

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

Wednesday, April 24, 2013

Android Voice Recognition

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