TextToSpeech（TTS）功能

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <TextView
        android:id="@+id/speechTxt"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:text="you are very good !" />

    <Button
        android:id="@+id/speechBtn"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"
        android:layout_marginTop="22dp"
        android:text="text to speech" />

</RelativeLayout>

package fly.aty;

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.TextView;
import android.widget.Toast;

public class MainAty extends Activity implements OnClickListener, OnInitListener{

	private Button speechBtn; // 按钮控制开始朗读
	private TextView speechTxt; // 需要朗读的内容
	private TextToSpeech textToSpeech; // TTS对象

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

		speechBtn = (Button) findViewById(R.id.speechBtn);
		speechBtn.setOnClickListener(this);

		speechTxt = (TextView) findViewById(R.id.speechTxt);
		textToSpeech = new TextToSpeech(this, this); // 参数Context,TextToSpeech.OnInitListener
	}
	
	/**
	 * 用来初始化TextToSpeech引擎
	 * status:SUCCESS或ERROR这2个值
	 * setLanguage设置语言，帮助文档里面写了有22种
	 * TextToSpeech.LANG_MISSING_DATA：表示语言的数据丢失。
	 * TextToSpeech.LANG_NOT_SUPPORTED:不支持
	 */
	@Override
	public void onInit(int status) {
		if (status == TextToSpeech.SUCCESS) {
			int result = textToSpeech.setLanguage(Locale.US);
			if (result == TextToSpeech.LANG_MISSING_DATA
					|| result == TextToSpeech.LANG_NOT_SUPPORTED) {
				Toast.makeText(this, "数据丢失或不支持", Toast.LENGTH_SHORT).show();
			}
		}
	}

	@Override
	public void onClick(View v) {
		if (textToSpeech != null && !textToSpeech.isSpeaking()) {
			textToSpeech.setPitch(0.5f);// 设置音调，值越大声音越尖（女生），值越小则变成男声,1.0是常规
			textToSpeech.speak(speechTxt.getText().toString(),
					TextToSpeech.QUEUE_FLUSH, null);
		}
	}

	@Override
	protected void onStop() {
		super.onStop();
		textToSpeech.stop(); // 不管是否正在朗读TTS都被打断
		textToSpeech.shutdown(); // 关闭，释放资源
	}
}