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);    }}

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