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虽然是实现Flutter的百度语音转文字功能,主要还是通过Android端来实现百度语音转文字功能,然后通过Flutter和Android端来传数据(如下图),来实现Flutter需求的功能。其中ios端也是可以实现百度语音转文字的功能,但是因为我的电脑是window系统,所以不能用flutter来开发ios,所以我下面的教程主要是针对Android端的实现。
原则肯定是先看一下效果呀,实例为证:
百度语音转汉字的时候一般都会在后面加一个句号。下图红色圆圈处不要打勾
找到flutter项目里面的Android文件,然后找到MainActivty,通过android studio,这里爆红不需要管他,开始build的时候可能会有点慢。
打开成功
记得选择Android Library
。 名字自己命名吧,我取名为asr_plugin,不细说了。 新建成功 百度SDK下载地址:https://ai.baidu.com/sdk
不要忘记加载这个jar包
把无用的包删掉,只留下如图中的so包
。 我建立你们把API_ID,API_KEY改为自己创建的百度语音识别应用,因为我们项目的包名不相同,如果包名不相同的话,就可以会导致结果错误
,创建应用的时候包名要设置与你的flutter端包名相同
。可以根据错误码来查看错误文件,查看错误码的网址:https://ai.baidu.com/ai-doc/SPEECH/qk38lxh1q。
此功能主要把asr_plugin加载到flutter里面,方便等下进行数据通信。
还需要一步,记得在建立一个asr_manager文件,通过MethodChannel 来进行通信。总共有三种通信方式,我们这里是属于方法通信。
总共有三个方法:开始录音、停止录音、取消录音。 代码如下:import 'package:flutter/services.dart';class AsrManager { static const MethodChannel _channel = const MethodChannel('asr_plugin'); ///开始录音 static Futurestart({ Map params}) async { return await _channel.invokeMethod('start', params ?? { }); } ///停止录音 static Future stop() async { return await _channel.invokeMethod('stop'); } ///取消录音 static Future cancel() async { return await _channel.invokeMethod('cancel'); }}
这些文件除了AsrPlugin,其他你可以在你下载的那个百度SDK里面找到,但是有一些需要修改的地方。
这些文件你可以自己去下面我的百度网盘处下载
,应该都是适配的: 链接:https://pan.baidu.com/s/1ODBeSEBfpSu3-GFOZgCvgw 提取码:gnkq 关于AsrPlugin文件,需要在Android端配置Flutter的环境:
在build.gradle文件中加入如图中代码:def localProperties = new Properties()def localPropertiesFile = rootProject.file('local.properties')if (localPropertiesFile.exists()) { localPropertiesFile.withReader('UTF-8') { reader -> localProperties.load(reader) }}def flutterRoot = localProperties.getProperty('flutter.sdk')apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"
flutter { source '../..'}
配置成功之后,我们就可以实现Android端可以使用flutter的文件了。
如果你没用配置好这个环境的话,你就不能实现Android端与flutter端的通信,用下面代码来实现与flutter的start,stop,cancel操作: 代码如下:import android.Manifest;import android.app.Activity;import android.content.pm.PackageManager;import android.util.Log;import androidx.annotation.Nullable;import androidx.core.app.ActivityCompat;import androidx.core.content.ContextCompat;import java.util.ArrayList;import java.util.Map;import io.flutter.plugin.common.BinaryMessenger;import io.flutter.plugin.common.MethodCall;import io.flutter.plugin.common.MethodChannel;public class AsrPlugin implements MethodChannel.MethodCallHandler { private final static String TAG = "AsrPlugin"; private final Activity activity; private ResultStateful resultStateful; private AsrManager asrManager; public static void registerWith(Activity activity, BinaryMessenger messenger) { MethodChannel channel = new MethodChannel(messenger, "asr_plugin"); AsrPlugin instance = new AsrPlugin(activity); channel.setMethodCallHandler(instance); } public AsrPlugin(Activity activity) { this.activity = activity; } @Override public void onMethodCall(MethodCall methodCall, MethodChannel.Result result) { initPermission(); switch (methodCall.method) { case "start": resultStateful = ResultStateful.of(result); start(methodCall, resultStateful); break; case "stop": stop(methodCall,result); break; case "cancel": cancel(methodCall,result); break; default: result.notImplemented(); } } private void start(MethodCall call, ResultStateful result) { if (activity == null) { Log.e(TAG, "Ignored start, current activity is null."); result.error("Ignored start, current activity is null.", null, null); return; } if (getAsrManager() != null) { getAsrManager().start(call.arguments instanceof Map ? (Map) call.arguments : null); } else { Log.e(TAG, "Ignored start, current getAsrManager is null."); result.error("Ignored start, current getAsrManager is null.", null, null); } } private void stop(MethodCall call, MethodChannel.Result result) { if (asrManager != null) { asrManager.stop(); } } private void cancel(MethodCall call, MethodChannel.Result result) { if (asrManager != null) { asrManager.cancel(); } } @Nullable private AsrManager getAsrManager() { if (asrManager == null) { if (activity != null && !activity.isFinishing()) { asrManager = new AsrManager(activity, onAsrListener); } } return asrManager; } /** * android 6.0 以上需要动态申请权限 */ private void initPermission() { String permissions[] = { Manifest.permission.RECORD_AUDIO, Manifest.permission.ACCESS_NETWORK_STATE, Manifest.permission.INTERNET, Manifest.permission.READ_PHONE_STATE, Manifest.permission.WRITE_EXTERNAL_STORAGE }; ArrayListtoApplyList = new ArrayList (); for (String perm :permissions){ if (PackageManager.PERMISSION_GRANTED != ContextCompat.checkSelfPermission(activity, perm)) { toApplyList.add(perm); //进入到这里代表没有权限. } } String tmpList[] = new String[toApplyList.size()]; if (!toApplyList.isEmpty()){ ActivityCompat.requestPermissions(activity, toApplyList.toArray(tmpList), 123); } } private OnAsrListener onAsrListener = new OnAsrListener() { @Override public void onAsrReady() { } @Override public void onAsrBegin() { } @Override public void onAsrEnd() { } @Override public void onAsrPartialResult(String[] results, RecogResult recogResult) { } @Override public void onAsrOnlineNluResult(String nluResult) { } @Override public void onAsrFinalResult(String[] results, RecogResult recogResult) { if (resultStateful != null) { resultStateful.success(results[0]); } } @Override public void onAsrFinish(RecogResult recogResult) { } @Override public void onAsrFinishError(int errorCode, int subErrorCode, String descMessage, RecogResult recogResult) { if (resultStateful != null) { resultStateful.error(descMessage, null, null); } } @Override public void onAsrLongFinish() { } @Override public void onAsrVolume(int volumePercent, int volume) { } @Override public void onAsrAudio(byte[] data, int offset, int length) { } @Override public void onAsrExit() { } @Override public void onOfflineLoaded() { } @Override public void onOfflineUnLoaded() { } };}
主要为了避免环境冲突而导致功能不成功,配置如图所示:
代码如下:ndk { abiFilters "armeabi-v7a","arm64-v8a","x86_64","x86" /*只打包flutter所支持的架构,flutter没有armeabi架构的so,加x86的原因是为了能够兼容模拟器 abiFilters "armeabi-v7a" release 时打"armeabi-v7包 */ }
packagingOptions { /* 确保app与asr_plugin都依赖的libflutter.so libapp.so merge时不冲突@https://github.com/card-io/card.io-Android-SDK/issues/186#issuecomment-427552552 */ pickFirst 'lib/x86_64/libflutter.so' pickFirst 'lib/x86_64/libapp.so' pickFirst 'lib/x86/libflutter.so' pickFirst 'lib/arm64-v8a/libflutter.so' pickFirst 'lib/arm64-v8a/libapp.so' pickFirst 'lib/armeabi-v7a/libapp.so' }
主要是在flutter的android文件夹中调用我们上面建立的android的module里面通信文件AsrPlugin,然后用来通信数据通信,达到我们所需要的效果。
import android.os.Bundle;import androidx.annotation.NonNull;import com.example.asr_plugin.AsrPlugin;import io.flutter.embedding.android.FlutterActivity;import io.flutter.embedding.engine.FlutterEngine;import io.flutter.plugins.GeneratedPluginRegistrant;public class MainActivity extends FlutterActivity { @Override public void configureFlutterEngine(@NonNull FlutterEngine flutterEngine) { GeneratedPluginRegistrant.registerWith(flutterEngine); //flutter sdk >= v1.17.0 时使用下面方法注册自定义plugin AsrPlugin.registerWith(this, flutterEngine.getDartExecutor().getBinaryMessenger()); } @Override protected void onCreate(Bundle savedInstanceState ) { super.onCreate(savedInstanceState); }}
import 'package:flutter/material.dart';import 'asr_manager.dart';void main(){ runApp(MaterialApp( home: SpeakPage(), ));}///语音识别class SpeakPage extends StatefulWidget { @override _SpeakPageState createState() => _SpeakPageState();}class _SpeakPageState extends Statewith SingleTickerProviderStateMixin { String speakTips = '长按说话'; String speakResult = ''; String result='故宫门票\n北京一日游\n迪士尼乐园'; Animation animation; AnimationController controller; @override void initState() { controller = AnimationController( vsync: this, duration: Duration(milliseconds: 1000)); animation = CurvedAnimation(parent: controller, curve: Curves.easeIn) ..addStatusListener((status) { if (status == AnimationStatus.completed) { controller.reverse(); } else if (status == AnimationStatus.dismissed) { controller.forward(); } }); super.initState(); } @override void dispose() { controller.dispose(); super.dispose(); } @override Widget build(BuildContext context) { return Scaffold( body: Container( padding: EdgeInsets.all(30), child: Center( child: Column( mainAxisAlignment: MainAxisAlignment.spaceBetween, children: [_topItem(), _bottomItem()], ), ), ), ); } _speakStart() { controller.forward(); setState(() { speakTips = '- 识别中 -'; }); AsrManager.start().then((text) { if (text != null && text.length > 0) { setState(() { speakResult = text; result=speakResult; }); /*Navigator.pop(context); Navigator.push(context,MaterialPageRoute(builder: (context)=> SearchPage( keyword: speakResult, )));*/ print("错误" + text); } }).catchError((e) { print("----------123" + e.toString()); }); } _speakStop() { setState(() { speakTips = '长按说话'; }); controller.reset(); controller.stop(); AsrManager.stop(); } _topItem() { return Column( children: [ Padding( padding: EdgeInsets.fromLTRB(0, 30, 0, 30), child: Text('你可以这样说', style: TextStyle(fontSize: 16, color: Colors.black54))), Text(result, textAlign: TextAlign.center, style: TextStyle( fontSize: 15, color: Colors.grey, )), Padding( padding: EdgeInsets.all(20), child: Text( speakResult, style: TextStyle(color: Colors.blue), ), ) ], ); } _bottomItem() { return FractionallySizedBox( widthFactor: 1, child: Stack( children: [ GestureDetector( onTapDown: (e) { _speakStart(); }, onTapUp: (e) { _speakStop(); }, onTapCancel: () { _speakStop(); }, child: Center( child: Column( children: [ Padding( padding: EdgeInsets.all(10), child: Text( speakTips, style: TextStyle(color: Colors.blue, fontSize: 12), ), ), Stack( children: [ Container( //占坑,避免动画执行过程中导致父布局大小变得 height: MIC_SIZE, width: MIC_SIZE, ), Center( child: AnimatedMic( animation: animation, ), ) ], ) ], ), ), ), Positioned( right: 0, bottom: 20, child: GestureDetector( onTap: () { Navigator.pop(context); }, child: Icon( Icons.close, size: 30, color: Colors.grey, ), ), ) ], ), ); }}const double MIC_SIZE = 80;class AnimatedMic extends AnimatedWidget { static final _opacityTween = Tween (begin: 1, end: 0.5); static final _sizeTween = Tween (begin: MIC_SIZE, end: MIC_SIZE - 20); AnimatedMic({ Key key, Animation animation}) : super(key: key, listenable: animation); @override Widget build(BuildContext context) { final Animation animation = listenable; return Opacity( opacity: _opacityTween.evaluate(animation), child: Container( height: _sizeTween.evaluate(animation), width: _sizeTween.evaluate(animation), decoration: BoxDecoration( color: Colors.blue, borderRadius: BorderRadius.circular(MIC_SIZE / 2), ), child: Icon( Icons.mic, color: Colors.white, size: 30, ), ), ); }}
步骤可能毕竟多,我可能有也很多没用考虑的地方哦,如果遇到问题可以提出来,这个功能的实现主要来自我学习flutter视频的那个老师,老师博客地址:https://blog.csdn.net/fengyuzhengfan。