TextToSpeech 文本自动朗读

Android提供了自动朗读支持。

• TextToSpeech(Context context, TextToSpeech.OnInitListener listener)
• setLanguage(Locale loc)。如果调用setLanguage(Locale loc)的返回值是 TextToSpeech.LANG_COUNTRY_AVAILABLE 则说明当前TTS系统可以支持所设置的语言、国家选项。
• speak(String text, int queueMode, HashMap<String,String> params)
• synthesizeToFile(String text, HashMap<String,String> params, String filename)
• TextToSpeech.QUEUE_FLUSH
• TextToSpeech.QUEUE_ADD

归纳起来，使用TextToSpeech引擎的步骤如下：
（1）创建TextToSpeech对象，创建时传入OnInitListener监听器监听创建是否成功。
（2）设置TextToSpeech所使用语言、国家选项，通过返回值判断TTS是否支持该语言、国家选项。
（3）调用speak或synthesizeToFile方法。
（4）关闭TTS，释放资源。
src\org\crazyit\io\Speech.java

package org.crazyit.io;

import java.util.Locale;

import android.app.Activity;
import android.os.Bundle;
import android.speech.tts.TextToSpeech;
import android.speech.tts.TextToSpeech.OnInitListener;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

/**
 * Description:
 * <br/>site: <a href="http://www.crazyit.org">crazyit.org</a>
 * <br/>Copyright (c), 2001-2014, F.L
 * <br/>This program is protected by copyright laws.
 * <br/>Program Name:
 * <br/>Date:
 * @author [e-mail]
 * @version 1.0
*/
public class Speech extends Activity
{
	TextToSpeech tts;
	EditText editText;
	Button speech;
	Button record;
	@Override
	public void onCreate(Bundle savedInstanceState)
	{
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);
		// 初始化TextToSpeech对象
		tts = new TextToSpeech(this, new OnInitListener()
		{
			@Override
			public void onInit(int status)
			{
				// 如果装载TTS成功
				if ( status == TextToSpeech.SUCCESS)
				{
					// 设置使用英式英语朗读
					int result = tts.setLanguage(Locale.UK);
					// 如果不支持所设置的语言
					if ( result != TextToSpeech.LANG_COUNTRY_AVAILABLE
						&& result != TextToSpeech.LANG_AVAILABLE)
					{
						Toast.makeText(Speech.this
							, "TTS暂时不支持这种语言的朗读。", Toast.LENGTH_LONG)
							.show();
						}
					}
				}
								
		});
		editText = (EditText) findViewById(R.id.txt);
		speech = (Button) findViewById(R.id.speech);
		record = (Button) findViewById(R.id.record);
		speech.setOnClickListener(new OnClickListener()
		{
			@Override
			public void onClick(View arg0)
			{
				// 执行朗读
				tts.speak(editText.getText().toString(),
					TextToSpeech.QUEUE_ADD, null);
			}
		});
		record.setOnClickListener(new OnClickListener()
		{
			@Override
			public void onClick(View arg0)
			{
				// 将朗读文本的音频记录到指定文件
				tts.synthesizeToFile(editText.getText().toString()
					, null, "/mnt/sdcard/sound.wav");
				Toast.makeText(Speech.this, "声音记录成功！"
						, Toast.LENGTH_LONG).show();
				}
			});
	}
										
	@Override
	public void onDestroy()
	{
		// 关闭TextToSpeec对象
		if ( tts != null)
		{
			tts.shutdown();
		}
	}		
}

res\layout\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"
	android:gravity="center_horizontal"
	>
<EditText 
	android:id="@+id/txt"
	android:layout_width="fill_parent" 
	android:layout_height="wrap_content" 
	android:lines="5"
	/>
<LinearLayout
	android:orientation="horizontal"
	android:layout_width="fill_parent"
	android:layout_height="wrap_content"
	android:gravity="center_horizontal"
	>	
<Button 
	android:id="@+id/speech"
	android:layout_width="wrap_content" 
	android:layout_height="wrap_content" 
	android:text="@string/speech"
	/>
<Button 
	android:id="@+id/record"
	android:layout_width="wrap_content" 
	android:layout_height="wrap_content" 
	android:text="@string/record"
	/>	
</LinearLayout>	
</LinearLayout>

res\values\strings.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
	<string name="hello">Hello World, Speek!</string>
	<string name="app_name">自动朗读</string>
	<string name="speech">朗读</string>
	<string name="record">记录声音</string>
</resources>

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest
	xmlns:android="http://schemas.android.com/apk/res/android"
	package="org.crazyit.io"
	android:versionCode="1"
	android:versionName="1.0">
	<uses-sdk
		android:minSdkVersion="10"
		android:targetSdkVersion="17" />
	<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
	<application
		android:icon="@drawable/ic_launcher"
		android:label="@string/app_name">
		<activity
			android:name=".Speech"
			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>