Android(朗读文本) TextToSpeech的使用

使用TextToSpeech 可以朗读文本，要先初始化TextToSpeech 对象，通过实现TextToSpeech.OnInitListener接口来检测初始化状态成功与否（设置语言等动作是否成功），初始化成功后，才可以使用，用完该对象后，要调用shutdown方法，释放TextToSpeech （TTS）引擎占用的资源

package com.zhou.activity;

import java.util.Locale;
import java.util.Random;

import android.app.Activity;
import android.os.Bundle;
import android.speech.tts.TextToSpeech;
import android.util.Log;
import android.view.View;
import android.widget.Button;

public class TextToSpeechActivity extends Activity implements TextToSpeech.OnInitListener{
	  private static final String TAG = "TextToSpeechDemo";

	    private TextToSpeech mTts;
	    private Button mAgainButton;

	    @Override
	    public void onCreate(Bundle savedInstanceState) {
	        super.onCreate(savedInstanceState);
	        setContentView(R.layout.text_to_speech);

	        // 初始化TextToSpeech对象. 是一个异步操作.
	        // 初始化监听对象，在完成初始化时调用
	        mTts = new TextToSpeech(this,this);
	        //取得按钮
	        mAgainButton = (Button) findViewById(R.id.again_button);
	        //为按钮设置单击事件
	        mAgainButton.setOnClickListener(new View.OnClickListener() {
	            public void onClick(View v) {
	                sayHello();
	            }
	        });
	    }

	    @Override
	    public void onDestroy() {
	        if (mTts != null) {
	        	//停止TextToSpeech
	            mTts.stop();
	            //释放TextToSpeech占用的资源
	            mTts.shutdown();
	        }
	        super.onDestroy();
	    }

	    //实现TextToSpeech.OnInitListener接口.
	    public void onInit(int status) {
	        //状态成功
	        if (status == TextToSpeech.SUCCESS) {
	           //设置语言
	            int result = mTts.setLanguage(Locale.US);
	            //（我试了中文，不好使？？？？）
//	            int result = mTts.setLanguage(Locale.CHINA);
	          
	            if (result == TextToSpeech.LANG_MISSING_DATA ||
	                result == TextToSpeech.LANG_NOT_SUPPORTED) {
	               // 如果不支持该语言
	                Log.e(TAG, "Language is not available.");
	            } else {
	                // TTS 引擎已经成功初始化 
	                //按钮设置为可点击
	                mAgainButton.setEnabled(true);
	                //发音朗读
	                sayHello();
	            }
	        } else {
	            // 初始化失败
	            Log.e(TAG, "Could not initialize TextToSpeech.");
	        }
	    }

	    private static final Random RANDOM = new Random();
	    private static final String[] HELLOS = {
	      "Hello",
	      "Salutations",
	      "Greetings",
	      "Howdy",
	      "What's crack-a-lackin?",
	      "That explains the stench!"
	    };
	    //尝试朗读中文，失败了，语言设置为中国的也不行
//	    private static final String[] HELLOS = {
//		      "中国",
//		      "北京",
//		      "上海",
//		      "吉林",
//		      "辽宁",
//		      "北京欢迎你"
//		    };
	    private void sayHello() {
	        // Select a random hello.
	        int helloLength = HELLOS.length;
	        String hello = HELLOS[RANDOM.nextInt(helloLength)];
	        //朗读
	        mTts.speak(hello,TextToSpeech.QUEUE_FLUSH, null);
	    }
}