안드로이드 음성 인식 기능 (STT)

In this tutorial we are going to show how to use Android’s Speech To Text API. Android currently supports offline mode also. The only thing is that you have to downlad offline language packages.

To learn how to enable offline mode speech to text, please follow the tutorial How to enable offline Speech To Text in Android

See following Steps :

1. Start RecognizerIntent intent with the RecognizerIntent.ACTION_RECOGNIZE_SPEECH as action.
2. Handle the text data returned by Speech to Text API

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1. Manifest file

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android"     package="com.stackandroid.speechtotext"     android:versionCode="1"     android:versionName="1.0" >     <uses-sdk         android:minSdkVersion="19"         android:targetSdkVersion="21" />     <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="MainActivity"             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>

2. Activity layout file

activity_main.xml

<RelativeLayout 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:background="@color/bg_color"     android:orientation="vertical" >     <TextView         android:id="@+id/txt_output"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:layout_alignParentTop="true"         android:layout_centerHorizontal="true"         android:layout_marginTop="100dp"         android:textColor="@color/white"         android:textSize="26dp"         android:textStyle="normal" />     <LinearLayout         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:layout_alignParentBottom="true"         android:layout_centerHorizontal="true"         android:layout_marginBottom="60dp"         android:gravity="center"         android:orientation="vertical" >         <ImageButton             android:id="@+id/btn_mic"             android:layout_width="80dp"             android:layout_height="80dp"             android:background="@null"             android:scaleType="centerCrop"             android:src="@drawable/microphone" />         <TextView             android:layout_width="wrap_content"             android:layout_height="wrap_content"             android:layout_marginTop="10dp"             android:text="Speech to text using Google API"             android:textColor="@color/white"             android:textSize="15dp"             android:textStyle="normal" />     </LinearLayout> </RelativeLayout>

3. Main Activity code

Start the speech recognizer intent using startActivityForResult() with bundle extras.

Required extras:

• EXTRA_LANGUAGE_MODEL

Optional extras:

• EXTRA_PROMPT
• EXTRA_LANGUAGE
• EXTRA_MAX_RESULTS
• EXTRA_RESULTS_PENDINGINTENT
• EXTRA_RESULTS_PENDINGINTENT_BUNDLE

Result extras (returned in the result, not to be specified in the request):

• EXTRA_RESULTS

Note: The extra EXTRA_LANGUAGE_MODEL is mandatory. Also handle ActivityNotFoundException there may be no applications installed in the device to support this speech recognition action.

MainActivity.java

package com.stackandroid.speechtotext; import java.util.ArrayList; import java.util.Locale; import android.app.Activity; import android.content.ActivityNotFoundException; import android.content.Intent; import android.os.Bundle; import android.speech.RecognizerIntent; import android.view.View; import android.widget.ImageButton; import android.widget.TextView; import android.widget.Toast; public class MainActivity extends Activity {     private final int SPEECH_RECOGNITION_CODE = 1;     private TextView txtOutput;     private ImageButton btnMicrophone;     @Override     protected void onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState);         setContentView(R.layout.activity_main);         txtOutput = (TextView) findViewById(R.id.txt_output);         btnMicrophone = (ImageButton) findViewById(R.id.btn_mic);         btnMicrophone.setOnClickListener(new View.OnClickListener() {             @Override             public void onClick(View v) {                 startSpeechToText();             }         });     }     /**      * Start speech to text intent. This opens up Google Speech Recognition API dialog box to listen the speech input.      * */      private void startSpeechToText() {         Intent intent = new Intent(RecognizerIntent.ACTION_RECOGNIZE_SPEECH);         intent.putExtra(RecognizerIntent.EXTRA_LANGUAGE, Locale.getDefault());         intent.putExtra(RecognizerIntent.EXTRA_LANGUAGE_MODEL,                 RecognizerIntent.LANGUAGE_MODEL_FREE_FORM);         intent.putExtra(RecognizerIntent.EXTRA_PROMPT,                 "Speak something...");         try {             startActivityForResult(intent, SPEECH_RECOGNITION_CODE);         } catch (ActivityNotFoundException a) {             Toast.makeText(getApplicationContext(),                     "Sorry! Speech recognition is not supported in this device.",                     Toast.LENGTH_SHORT).show();         }      }      /**       * Callback for speech recognition activity       * */      @Override      protected void onActivityResult(int requestCode, int resultCode, Intent data) {          super.onActivityResult(requestCode, resultCode, data);          switch (requestCode) {          case SPEECH_RECOGNITION_CODE: {              if (resultCode == RESULT_OK && null != data) {                  ArrayList<String> result = data                          .getStringArrayListExtra(RecognizerIntent.EXTRA_RESULTS);                  String text = result.get(0);                  txtOutput.setText(text);              }              break;          }          }      } }

4. Demonstration
Speech to text demonstration using RecognizerIntent .

Speech to text demo

Offline mode is not enabled

Offline mode not enabled

[출처] http://stackandroid.com/tutorial/android-speech-to-text-tutorial/