android 自动朗读功能

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;        public class Speech extends Activity {    TextToSpeech tts;    EditText edittext;    Button play;    Button record;    @Override    public void onCreate(Bundle savedInstanceState) {        // TODO Auto-generated method stub        super.onCreate(savedInstanceState);        setContentView(R.layout.speech);        tts=new TextToSpeech(this,new OnInitListener()        {                public void onInit(int status) {                // TODO Auto-generated method stub                if(status==TextToSpeech.SUCCESS)                {                    int result=tts.setLanguage(Locale.US);                    if(result!=TextToSpeech.LANG_AVAILABLE)                    {                        Toast.makeText(Speech.this, "TTS暂时不支持这种语言的朗读。", 50000).show();                    }                }            }                    });        edittext=(EditText)findViewById(R.id.edittext);        play=(Button)findViewById(R.id.play);        record=(Button)findViewById(R.id.record);        play.setOnClickListener(new OnClickListener()        {                public void onClick(View v) {                // TODO Auto-generated method stub                tts.speak(edittext.getText().toString(), TextToSpeech.QUEUE_ADD, null);            }                    });        record.setOnClickListener(new OnClickListener()        {                public void onClick(View v) {                // TODO Auto-generated method stub                tts.synthesizeToFile(edittext.getText().toString(), null, "/mnt/sdcard/sound.wav");                Toast.makeText(Speech.this, "声音文件记录成功", 50000).show();            }                    });            }    private OnInitListener OnInitListener() {        // TODO Auto-generated method stub        return null;    }    public void onDestory()    {        if(tts!=null){            tts.shutdown();        }    }        }