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使用百度语音识别,先要申请APP ID,这个直接到百度网站上有说明文档,本文不再赘述。申请之后,下载SDK包,按照百度官网要求,合并libs和res两个目录到项目中,然后在build.gradle(module:app)中的Android{...}下添加
sourceSets{
main{
jniLibs.srcDirs=['libs']
}
}
这样, 百度语音识别的so文件才能正常使用。
Manifest文件中添加权限
<uses-permission android:name="android.permission.RECORD_AUDIO" />
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
<uses-permission android:name="android.permission.CHANGE_WIFI_STATE" />
<uses-permission android:name="android.permission.READ_PHONE_STATE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
然后还要在Manifest中添加
<!-- 请填写应用实际的APP_ID -->
<meta-data android:name="com.baidu.speech.APP_ID" android:value="APP ID"/>
<!-- 请填写应用实际的API_KEY -->
<meta-data android:name="com.baidu.speech.API_KEY" android:value="API_KEY"/>
<!-- 请填写应用实际的SECRET_KEY -->
<meta-data android:name="com.baidu.speech.SECRET_KEY" android:value="SECRET_KEY"/>
<service android:name="com.baidu.speech.VoiceRecognitionService" android:exported="false" />
其中的APP ID,API_KEY和SECRET_KEY替换为你申请的内容。
我们封装了一个工具类,用来使用语音识别
package com.yjp.speechrecognizer;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.speech.RecognitionListener;
import android.speech.SpeechRecognizer;
import android.widget.Toast;
import com.baidu.speech.VoiceRecognitionService;
public class SpeechRecognizerTool implements RecognitionListener {
public interface ResultsCallback {
void onResults(String result);
}
private Context mContext;
private SpeechRecognizer mSpeechRecognizer;
private ResultsCallback mResultsCallback;
public SpeechRecognizerTool(Context context) {
mContext = context;
}
public synchronized void createTool() {
if (null == mSpeechRecognizer) {
// 创建识别器
mSpeechRecognizer = SpeechRecognizer.createSpeechRecognizer(mContext,
new ComponentName(mContext, VoiceRecognitionService.class));
// 注册监听器
mSpeechRecognizer.setRecognitionListener(this);
}
}
public synchronized void destroyTool() {
mSpeechRecognizer.stopListening();
mSpeechRecognizer.destroy();
mSpeechRecognizer = null;
}
// 开始识别
public void startASR(ResultsCallback callback) {
mResultsCallback = callback;
Intent intent = new Intent();
bindParams(intent);
mSpeechRecognizer.startListening(intent);
}
//停止识别
public void stopASR() {
mSpeechRecognizer.stopListening();
}
private void bindParams(Intent intent) {
// 设置识别参数
}
@Override
public void onReadyForSpeech(Bundle params) {
// 准备就绪
Toast.makeText(mContext, "请开始说话", Toast.LENGTH_SHORT).show();
}
@Override
public void onBeginningOfSpeech() {
// 开始说话处理
}
@Override
public void onRmsChanged(float rmsdB) {
// 音量变化处理
}
@Override
public void onBufferReceived(byte[] buffer) {
// 录音数据传出处理
}
@Override
public void onEndOfSpeech() {
// 说话结束处理
}
@Override
public void onError(int error) {
}
@Override
public void onResults(Bundle results) {
// 最终结果处理
if (mResultsCallback != null) {
String text = results.get(SpeechRecognizer.RESULTS_RECOGNITION)
.toString().replace("]", "").replace("[", "");
mResultsCallback.onResults(text);
}
}
@Override
public void onPartialResults(Bundle partialResults) {
// 临时结果处理
}
@Override
public void onEvent(int eventType, Bundle params) {
}
}
MainActivity的界面如下
<?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:id="@+id/activity_main"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:orientation="vertical"
android:gravity="center"
tools:context="com.yjp.speechrecognizer.MainActivity">
<Button
android:id="@+id/startSpeechButton"
android:layout_width="60dp"
android:layout_height="40dp"
android:background="@drawable/bdspeech_btn_orangelight_normal"
android:text="按住说话"/>
<TextView
android:id="@+id/speechTextView"
android:layout_margin="10dp"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</LinearLayout>
MainActivity的类实现为:
package com.yjp.speechrecognizer;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.MotionEvent;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
public class MainActivity extends AppCompatActivity implements SpeechRecognizerTool.ResultsCallback {
private Button mStartSpeechButton;
private TextView mTextView;
private SpeechRecognizerTool mSpeechRecognizerTool = new SpeechRecognizerTool(this);
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mTextView = (TextView) findViewById(R.id.speechTextView);
mStartSpeechButton = (Button) findViewById(R.id.startSpeechButton);
mStartSpeechButton.setOnTouchListener(new View.OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
int action = event.getAction();
switch (action) {
case MotionEvent.ACTION_DOWN:
mSpeechRecognizerTool.startASR(MainActivity.this);
mStartSpeechButton.setBackgroundResource(
R.drawable.bdspeech_btn_orangelight_pressed);
break;
case MotionEvent.ACTION_UP:
mSpeechRecognizerTool.stopASR();
mStartSpeechButton.setBackgroundResource(
R.drawable.bdspeech_btn_orangelight_normal);
break;
default:
return false;
}
return true;
}
});
}
@Override
protected void onStart() {
super.onStart();
mSpeechRecognizerTool.createTool();
}
@Override
protected void onStop() {
super.onStop();
mSpeechRecognizerTool.destroyTool();
}
@Override
public void onResults(String result) {
final String finalResult = result;
MainActivity.this.runOnUiThread(new Runnable() {
@Override
public void run() {
mTextView.setText(finalResult);
}
});
}
}
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