使用安卓中的TextToSpeech控件实现朗读文字

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context="com.lizhanqi.www.androidtexttospeech.MainActivity">
    <EditText
        android:id="@+id/editText"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="请输入要朗诵的字" />
    <Button
        android:id="@+id/btn_read"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="读" />
</LinearLayout>

package com.lizhanqi.www.androidtexttospeech;
import android.os.Bundle;
import android.speech.tts.TextToSpeech;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
import java.util.Locale;
public class MainActivity extends AppCompatActivity  implements View.OnClickListener, TextToSpeech.OnInitListener {
    private Button speechBtn; // 按钮控制开始朗读
    private EditText 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.activity_main);
        speechBtn = (Button) findViewById(R.id.btn_read);
        speechBtn.setOnClickListener(this);
        speechTxt = (EditText) findViewById(R.id.editText);
        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.CHINA);
            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(0.0f);// 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
    }
}