二、文字转语音

既然明确了一个引擎能够支持哪些语言，接下来就可以大胆设置朗读的语言了，并且设置好语言后，还得提供对应的文字才可以，下面是一个语音播报页面的实例

中文普通话播报

英文版播报 

可以在下拉框中选择自己想要朗读的语言 

 代码如下

Java类

package com.example.voice;import android.os.Bundle;
import android.speech.tts.TextToSpeech;
import android.util.Log;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.EditText;
import android.widget.Spinner;
import android.widget.Toast;import androidx.appcompat.app.AppCompatActivity;import com.example.voice.bean.Language;import java.util.ArrayList;
import java.util.List;
import java.util.Locale;public class SpeechComposeActivity extends AppCompatActivity {private final static String TAG = "SpeechComposeActivity";private TextToSpeech mSpeech; // 声明一个文字转语音对象private EditText et_tts; // 声明一个编辑框对象private List mEngineList; // 语音引擎列表@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_speech_compose);et_tts = findViewById(R.id.et_tts);findViewById(R.id.btn_read).setOnClickListener(v -> {String content = et_tts.getText().toString();// 开始朗读指定文本int result = mSpeech.speak(content, TextToSpeech.QUEUE_FLUSH, null, null);String desc = String.format("朗读%s", result==TextToSpeech.SUCCESS?"成功":"失败");Toast.makeText(this, desc, Toast.LENGTH_SHORT).show();});// 创建一个文字转语音对象，初始化结果在监听器的onInit方法中返回mSpeech = new TextToSpeech(this, mListener);}// 创建一个文字转语音的初始化监听器实例private TextToSpeech.OnInitListener mListener = status -> {if (status == TextToSpeech.SUCCESS) { // 初始化成功if (mEngineList == null) { // 首次初始化mEngineList = mSpeech.getEngines(); // 获取系统支持的所有语音引擎initEngineSpinner(); // 初始化语音引擎下拉框}initLanguageSpinner(); // 初始化语言下拉框}};// 初始化语音引擎下拉框private void initEngineSpinner() {String[] engineArray = new String[mEngineList.size()];for(int i=0; i engineAdapter = new ArrayAdapter<>(this,R.layout.item_select, engineArray);Spinner sp_engine = findViewById(R.id.sp_engine);sp_engine.setPrompt("请选择语音引擎");sp_engine.setAdapter(engineAdapter);sp_engine.setOnItemSelectedListener(new EngineSelectedListener());sp_engine.setSelection(0);}private class EngineSelectedListener implements AdapterView.OnItemSelectedListener {public void onItemSelected(AdapterView arg0, View arg1, int arg2, long arg3) {recycleSpeech(); // 回收文字转语音对象// 创建指定语音引擎的文字转语音对象mSpeech = new TextToSpeech(SpeechComposeActivity.this, mListener,mEngineList.get(arg2).name);}public void onNothingSelected(AdapterView arg0) {}}// 回收文字转语音对象private void recycleSpeech() {if (mSpeech != null) {mSpeech.stop(); // 停止文字转语音mSpeech.shutdown(); // 关闭文字转语音mSpeech = null;}}@Overrideprotected void onDestroy() {super.onDestroy();recycleSpeech(); // 回收文字转语音对象}private String[] mLanguageArray = {"中文普通话", "英语", "法语", "德语", "意大利语"};private Locale[] mLocaleArray = { Locale.CHINA, Locale.ENGLISH, Locale.FRENCH, Locale.GERMAN, Locale.ITALIAN };private String[] mValidLanguageArray; // 当前引擎支持的语言名称数组private Locale[] mValidLocaleArray; // 当前引擎支持的语言类型数组private String mTextCN = "离离原上草，一岁一枯荣。野火烧不尽，春风吹又生。";private String mTextEN = "Hello World. Nice to meet you. This is a TTS demo.";// 初始化语言下拉框private void initLanguageSpinner() {List languageList = new ArrayList<>();// 下面遍历语言数组，从中挑选出当前引擎所支持的语言列表for (int i=0; i languageAdapter = new ArrayAdapter<>(this,R.layout.item_select, mValidLanguageArray);Spinner sp_language = findViewById(R.id.sp_language);sp_language.setPrompt("请选择朗读语言");sp_language.setAdapter(languageAdapter);sp_language.setOnItemSelectedListener(new LanguageSelectedListener());sp_language.setSelection(0);}private class LanguageSelectedListener implements AdapterView.OnItemSelectedListener {public void onItemSelected(AdapterView arg0, View arg1, int arg2, long arg3) {if (mValidLocaleArray[arg2]==Locale.CHINA) { // 汉语et_tts.setText(mTextCN);} else { // 其他语言et_tts.setText(mTextEN);}mSpeech.setLanguage(mValidLocaleArray[arg2]); // 设置选中的朗读语言}public void onNothingSelected(AdapterView arg0) {}}}

三、原生的语音识别

Android提供了语音识别器SpeechRecognizer 该工具常用方法如下

isRecognitionAvailable  检查系统是否支持原生的语音识别

createSpeechRecognizer 创建原生的语音识别器对象

setRecognitionListener 设置语音识别监听器

startListening 开始语音识别

stopListening 停止语音识别

cancel 取消语音识别

destroy 销毁语音识别器

识别结果监听器提供了许多回调方法，其中onResults方法可获得识别后的文本信息，然而每个引擎对文本结果的包装结构不尽相同，比如百度语音返回JSON格式的字符串，而讯飞语音返回字符串列表，为此要分别尝试几种格式的文本识别  效果如下

 结果如下 点击开始识别后对着麦克风说话 停止识别后则会自动输出识别内容

此处连接真机测试更佳 模拟机可能没有麦克风~~~

 代码如下

java类

package com.example.voice;import androidx.appcompat.app.AppCompatActivity;import android.annotation.SuppressLint;
import android.content.ComponentName;
import android.content.Intent;
import android.graphics.Color;
import android.os.Bundle;
import android.provider.Settings;
import android.speech.RecognitionListener;
import android.speech.RecognizerIntent;
import android.speech.SpeechRecognizer;
import android.util.Log;
import android.widget.Button;
import android.widget.TextView;import org.json.JSONArray;
import org.json.JSONObject;import java.util.List;
import java.util.Locale;@SuppressLint("SetTextI18n")
public class SpeechRecognizeActivity extends AppCompatActivity implements RecognitionListener {private final static String TAG = "SpeechRecognizeActivity";private TextView tv_result; // 声明一个文本视图对象private Button btn_recognize; // 声明一个按钮对象private SpeechRecognizer mRecognizer; // 声明一个语音识别对象private boolean isRecognizing = false; // 是否正在识别@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_speech_recognize);tv_result = findViewById(R.id.tv_result);btn_recognize = findViewById(R.id.btn_recognize);// 检查系统是否支持原生的语音识别boolean enable = SpeechRecognizer.isRecognitionAvailable(this);if (enable) {initRecognize(); // 初始化语音识别} else {tv_result.setText("原生的语音识别服务不可用");btn_recognize.setEnabled(false);btn_recognize.setTextColor(Color.GRAY);}}// 初始化语音识别private void initRecognize() {String serviceComponent = Settings.Secure.getString(getContentResolver(), "voice_recognition_service");// 获得系统内置的语音识别服务ComponentName component = ComponentName.unflattenFromString(serviceComponent);Log.d(TAG, "getPackageName="+component.getPackageName()+",getClassName="+component.getClassName());tv_result.setText("原生的语音识别服务采用"+component.getPackageName()+"里的服务"+component.getClassName());// 创建原生的语音识别器对象mRecognizer = SpeechRecognizer.createSpeechRecognizer(this);mRecognizer.setRecognitionListener(this); // 设置语音识别监听器btn_recognize.setOnClickListener(v -> {if (!isRecognizing) { // 未在识别Intent intent = new Intent(RecognizerIntent.ACTION_RECOGNIZE_SPEECH);intent.putExtra(RecognizerIntent.EXTRA_PARTIAL_RESULTS, true);intent.putExtra(RecognizerIntent.EXTRA_LANGUAGE, Locale.CHINA);intent.putExtra(RecognizerIntent.EXTRA_LANGUAGE_MODEL,RecognizerIntent.LANGUAGE_MODEL_FREE_FORM);intent.putExtra(RecognizerIntent.EXTRA_MAX_RESULTS, 5);mRecognizer.startListening(intent); // 开始语音识别} else { // 正在识别mRecognizer.stopListening(); // 停止语音识别//mRecognizer.cancel(); // 取消语音识别}isRecognizing = !isRecognizing;btn_recognize.setText(isRecognizing?"停止识别":"开始识别");});}@Overridepublic void onReadyForSpeech(Bundle params) {}@Overridepublic void onBeginningOfSpeech() {}@Overridepublic void onRmsChanged(float rmsdB) {}@Overridepublic void onBufferReceived(byte[] buffer) {}@Overridepublic void onEndOfSpeech() {}@Overridepublic void onError(int error) {Log.d(TAG, "Recognize error:"+error);}@Overridepublic void onResults(Bundle results) {Log.d(TAG, "onResults Start");String desc = "";String key = SpeechRecognizer.RESULTS_RECOGNITION;try { // 百度语音分支String result = results.getString(key);Log.d(TAG, "result="+result);JSONObject object = new JSONObject(result);String recognizeResult = object.getString("recognizeResult");JSONArray recognizeArray = new JSONArray(recognizeResult);for (int i=0; i resultList = results.getStringArrayList(key);for (String str : resultList) {desc = desc + "\n" + str;Log.d(TAG, "desc="+desc);}}tv_result.setText("识别到的文字为："+desc);Log.d(TAG, "onResults End");}@Overridepublic void onPartialResults(Bundle partialResults) {Log.d(TAG, "onPartialResults");}@Overridepublic void onEvent(int eventType, Bundle params) {}@Overrideprotected void onDestroy() {super.onDestroy();if (mRecognizer != null) {mRecognizer.destroy(); // 销毁语音识别器}}}

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