檢查語音合成功能, Text-To-Speech (TTS).

自從Android平台1.6版後, Android加入語音合成功能, Text-To-Speech (TTS). 該附帶的語音合成引擎(TTS engine)支持英語，法語，德語，意大利語和西班牙語. 此外, 根據你的區域, 另外支持美國口音和英國口音的英語.

儘管所有的Android設備，都支持該語音功能, 但部分設備因為儲存空間有限，可能缺少該語言的資源文件. 所以應用程序應先檢查設備是否存在語音合成資源(TTS resources)與相應的意圖(intent).



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="@string/hello"
   />
<TextView 
   android:layout_width="fill_parent"
   android:layout_height="wrap_content"
   android:id="@+id/englishresult"
   />
<TextView 
   android:layout_width="fill_parent"
   android:layout_height="wrap_content"
   android:id="@+id/chineseresult"
   />
</LinearLayout>

主代碼

package com.AndroidTTS;

import java.util.Locale;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.speech.tts.TextToSpeech;
import android.speech.tts.TextToSpeech.OnInitListener;
import android.widget.TextView;

public class AndroidTTS extends Activity implements OnInitListener{
 
 final int MY_TTS_CHECK_CODE=1;
 private TextToSpeech myTTS;
 
 TextView englishResult, chineseResult;
 
   /** Called when the activity is first created. */
   @Override
   public void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       setContentView(R.layout.main);
      
       englishResult = (TextView)findViewById(R.id.englishresult);
       chineseResult = (TextView)findViewById(R.id.chineseresult);
      
       //Check if TextToSpeech Engine installed.
       Intent checkIntent = new Intent();
       checkIntent.setAction(TextToSpeech.Engine.ACTION_CHECK_TTS_DATA);
       startActivityForResult(checkIntent, MY_TTS_CHECK_CODE);
   }

 @Override
 protected void onActivityResult(int requestCode, int resultCode, Intent data) {
  // TODO Auto-generated method stub
  if (requestCode == MY_TTS_CHECK_CODE){
   if(resultCode==TextToSpeech.Engine.CHECK_VOICE_DATA_PASS){
    //TextToSpeech Engine installed.
    myTTS = new TextToSpeech(this, this);
   }else{
    //TextToSpeech Engine NOT installed, request to install.
    Intent installIntent = new Intent();
             installIntent.setAction(TextToSpeech.Engine.ACTION_INSTALL_TTS_DATA);
             startActivity(installIntent);
   }
  }
 }

 @Override
 public void onInit(int status) {
  // TODO Auto-generated method stub
  
  int isLanguageAvailable;
  
  //Check if Language available
  isLanguageAvailable = myTTS.isLanguageAvailable(Locale.ENGLISH);  
  englishResult.setText("ENGLISH: "+ getStringResult(isLanguageAvailable));
  
  isLanguageAvailable = myTTS.isLanguageAvailable(Locale.CHINESE);  
  chineseResult.setText("CHINESE: "+ getStringResult(isLanguageAvailable));
 }
 
 private String getStringResult(int resultLanguageAvailable)
 {
  String strResult;
  
  switch(resultLanguageAvailable){
  case(TextToSpeech.LANG_AVAILABLE):
   strResult = "LANG_AVAILABLE";
   break;
  case(TextToSpeech.LANG_COUNTRY_AVAILABLE):
   strResult = "LANG_COUNTRY_AVAILABLE";
   break;
  case(TextToSpeech.LANG_COUNTRY_VAR_AVAILABLE):
   strResult = "LANG_COUNTRY_VAR_AVAILABLE";
   break;
  case(TextToSpeech.LANG_MISSING_DATA):
   strResult = "LANG_MISSING_DATA";
   break;
  case(TextToSpeech.LANG_NOT_SUPPORTED):
   strResult = "LANG_NOT_SUPPORTED";
   break;
  default:
   strResult = "err: Should not happen!";
   break;
  }
  return strResult;
 }

 @Override
 protected void onDestroy() {
  // TODO Auto-generated method stub
  super.onDestroy();
  myTTS.shutdown();
 }
}

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