Android使用Flutter实现录音插件
作者：dengjiangszhan
这篇文章主要介绍了基于flutter实现录音功能,介绍了如何录音，如何把文件存放到本地，这些都是我们平常使用这个功能会遇到的问题。在使用的过程中遇到的问题也有列出，需要的朋友可以参考下
原生提供功能，Dart module 通过 method channel 异步调用
安卓部分
手动注册
Flutter 官方的做法，就是自动注册插件，
很方便
手动注册，体现本文的不同
插件是 AudioRecorderPlugin
class MainActivity: FlutterActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
flutterEngine!!.plugins.add(AudioRecorderPlugin())
}
}Android和Dart的通讯
主要是消息回调
下文依次是，
- 开始录音
- 结束录音
- 正在录音
- 是否有录音权限
注意，这里的录音权限包含两个，麦克风的权限，和存储权限
@Override
public void onMethodCall(@NonNull MethodCall call, @NonNull Result result) {
switch (call.method) {
case "start":
Log.d(LOG_TAG, "Start");
Log.d(LOG_TAG, "11111____");
String path = call.argument("path");
mExtension = call.argument("extension");
startTime = Calendar.getInstance().getTime();
if (path != null) {
mFilePath = Environment.getExternalStorageDirectory().getAbsolutePath() + "/" + path;
} else {
Log.d(LOG_TAG, "11111____222");
String fileName = String.valueOf(startTime.getTime());
mFilePath = Environment.getExternalStorageDirectory().getAbsolutePath() + "/" + fileName + mExtension;
}
Log.d(LOG_TAG, mFilePath);
startRecording();
isRecording = true;
result.success(null);
break;
case "stop":
Log.d(LOG_TAG, "Stop");
stopRecording();
long duration = Calendar.getInstance().getTime().getTime() - startTime.getTime();
Log.d(LOG_TAG, "Duration : " + String.valueOf(duration));
isRecording = false;
HashMap<String, Object> recordingResult = new HashMap<>();
recordingResult.put("duration", duration);
recordingResult.put("path", mFilePath);
recordingResult.put("audioOutputFormat", mExtension);
result.success(recordingResult);
break;
case "isRecording":
Log.d(LOG_TAG, "Get isRecording");
result.success(isRecording);
break;
case "hasPermissions":
Log.d(LOG_TAG, "Get hasPermissions");
Context context = _flutterBinding.getApplicationContext();
PackageManager pm = context.getPackageManager();
int hasStoragePerm = pm.checkPermission(Manifest.permission.WRITE_EXTERNAL_STORAGE, context.getPackageName());
int hasRecordPerm = pm.checkPermission(Manifest.permission.RECORD_AUDIO, context.getPackageName());
boolean hasPermissions = hasStoragePerm == PackageManager.PERMISSION_GRANTED && hasRecordPerm == PackageManager.PERMISSION_GRANTED;
result.success(hasPermissions);
break;
default:
result.notImplemented();
break;
}
}安卓录音
使用 wav 的封装格式，用 AudioRecord;
其他封装格式，用 MediaRecorder
上面两个播放器，有开始录音和结束录音功能；
暂停录音和恢复录音，则多次开始和结束，再把文件拼接在一起
Dart module部分
建立 MethodChannel, 异步调用上面的原生功能
class AudioRecorder {
static const MethodChannel _channel = const MethodChannel('audio_recorder');
static LocalFileSystem fs = LocalFileSystem();
static Future start(String path, AudioOutputFormat audioOutputFormat) async {
String extension;
if (path != null) {
if (audioOutputFormat != null) {
if (_convertStringInAudioOutputFormat(p.extension(path)) !=
audioOutputFormat) {
extension = _convertAudioOutputFormatInString(audioOutputFormat);
path += extension;
} else {
extension = p.extension(path);
}
} else {
if (_isAudioOutputFormat(p.extension(path))) {
extension = p.extension(path);
} else {
extension = ".m4a"; // default value
path += extension;
}
}
File file = fs.file(path);
if (await file.exists()) {
throw new Exception("A file already exists at the path :" + path);
} else if (!await file.parent.exists()) {
throw new Exception("The specified parent directory does not exist");
}
} else {
extension = ".m4a"; // default value
}
return _channel
.invokeMethod('start', {"path": path, "extension": extension});
}
static Future<Recording?> stop() async {
// 把原生带出来的信息，放入字典中
Map<String, dynamic> response =
Map.from(await _channel.invokeMethod('stop'));
if (response != null) {
int duration = response['duration'];
String fmt = response['audioOutputFormat'];
AudioOutputFormat? outputFmt = _convertStringInAudioOutputFormat(fmt);
if (fmt != null && outputFmt != null) {
Recording recording = new Recording(
new Duration(milliseconds: duration),
response['path'],
outputFmt,
response['audioOutputFormat']);
return recording;
}
} else {
return null;
}
}iOS部分
手动注册插件
这里的插件名， 为 SwiftAudioRecorderPlugin
public class SwiftAudioRecorderPlugin: NSObject, FlutterPlugin {
var isRecording = false
var hasPermissions = false
var mExtension = ""
var mPath = ""
var startTime: Date!
var audioRecorder: AVAudioRecorder?
public static func register(with registrar: FlutterPluginRegistrar) {
let channel = FlutterMethodChannel(name: "audio_recorder", binaryMessenger: registrar.messenger())
let instance = SwiftAudioRecorderPlugin()
registrar.addMethodCallDelegate(instance, channel: channel)
}
public func handle(_ call: FlutterMethodCall, result: @escaping FlutterResult) {
switch call.method {
case "start":
print("start")
let dic = call.arguments as! [String : Any]
mExtension = dic["extension"] as? String ?? ""
mPath = dic["path"] as? String ?? ""
startTime = Date()
let documentsPath = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)[0]
if mPath == "" {
mPath = documentsPath + "/" + String(Int(startTime.timeIntervalSince1970)) + ".m4a"
}
else{
mPath = documentsPath + "/" + mPath
}
print("path: " + mPath)
let settings = [
AVFormatIDKey: getOutputFormatFromString(mExtension),
AVSampleRateKey: 12000,
AVNumberOfChannelsKey: 1,
AVEncoderAudioQualityKey: AVAudioQuality.high.rawValue
]
do {
try AVAudioSession.sharedInstance().setCategory(AVAudioSession.Category.playAndRecord, options: AVAudioSession.CategoryOptions.defaultToSpeaker)
try AVAudioSession.sharedInstance().setActive(true)
let recorder = try AVAudioRecorder(url: URL(string: mPath)!, settings: settings)
recorder.delegate = self
recorder.record()
audioRecorder = recorder
} catch {
print("fail")
result(FlutterError(code: "", message: "Failed to record", details: nil))
}
isRecording = true
result(nil)
case "pause":
audioRecorder?.pause()
result(nil)
case "resume":
audioRecorder?.record()
result(nil)
case "stop":
print("stop")
audioRecorder?.stop()
audioRecorder = nil
let duration = Int(Date().timeIntervalSince(startTime as Date) * 1000)
isRecording = false
var recordingResult = [String : Any]()
recordingResult["duration"] = duration
recordingResult["path"] = mPath
recordingResult["audioOutputFormat"] = mExtension
result(recordingResult)
case "isRecording":
print("isRecording")
result(isRecording)
case "hasPermissions":
print("hasPermissions")
switch AVAudioSession.sharedInstance().recordPermission{
case AVAudioSession.RecordPermission.granted:
print("granted")
hasPermissions = true
case AVAudioSession.RecordPermission.denied:
print("denied")
hasPermissions = false
case AVAudioSession.RecordPermission.undetermined:
print("undetermined")
AVAudioSession.sharedInstance().requestRecordPermission() { [unowned self] allowed in
DispatchQueue.main.async {
if allowed {
self.hasPermissions = true
} else {
self.hasPermissions = false
}
}
}
default:()
}
result(hasPermissions)
default:
result(FlutterMethodNotImplemented)
}
}
}iOS插件
逻辑与安卓插件类似，
因为 iOS 的 AVAudioRecorder 对 pause 和 resume 操作，支持友好，
所以增添了暂停和恢复录音功能
iOS 端的权限比安卓权限，少一个
仅需要录音麦克风权限
public class SwiftAudioRecorderPlugin: NSObject, FlutterPlugin {
var isRecording = false
var hasPermissions = false
var mExtension = ""
var mPath = ""
var startTime: Date!
var audioRecorder: AVAudioRecorder?
public static func register(with registrar: FlutterPluginRegistrar) {
let channel = FlutterMethodChannel(name: "audio_recorder", binaryMessenger: registrar.messenger())
let instance = SwiftAudioRecorderPlugin()
registrar.addMethodCallDelegate(instance, channel: channel)
}
public func handle(_ call: FlutterMethodCall, result: @escaping FlutterResult) {
switch call.method {
case "start":
print("start")
let dic = call.arguments as! [String : Any]
mExtension = dic["extension"] as? String ?? ""
mPath = dic["path"] as? String ?? ""
startTime = Date()
let documentsPath = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)[0]
if mPath == "" {
mPath = documentsPath + "/" + String(Int(startTime.timeIntervalSince1970)) + ".m4a"
}
else{
mPath = documentsPath + "/" + mPath
}
print("path: " + mPath)
let settings = [
AVFormatIDKey: getOutputFormatFromString(mExtension),
AVSampleRateKey: 12000,
AVNumberOfChannelsKey: 1,
AVEncoderAudioQualityKey: AVAudioQuality.high.rawValue
]
do {
try AVAudioSession.sharedInstance().setCategory(AVAudioSession.Category.playAndRecord, options: AVAudioSession.CategoryOptions.defaultToSpeaker)
try AVAudioSession.sharedInstance().setActive(true)
let recorder = try AVAudioRecorder(url: URL(string: mPath)!, settings: settings)
recorder.delegate = self
recorder.record()
audioRecorder = recorder
} catch {
print("fail")
result(FlutterError(code: "", message: "Failed to record", details: nil))
}
isRecording = true
result(nil)
case "pause":
audioRecorder?.pause()
result(nil)
case "resume":
audioRecorder?.record()
result(nil)
case "stop":
print("stop")
audioRecorder?.stop()
audioRecorder = nil
let duration = Int(Date().timeIntervalSince(startTime as Date) * 1000)
isRecording = false
var recordingResult = [String : Any]()
recordingResult["duration"] = duration
recordingResult["path"] = mPath
recordingResult["audioOutputFormat"] = mExtension
result(recordingResult)
case "isRecording":
print("isRecording")
result(isRecording)
case "hasPermissions":
print("hasPermissions")
switch AVAudioSession.sharedInstance().recordPermission{
case AVAudioSession.RecordPermission.granted:
print("granted")
hasPermissions = true
case AVAudioSession.RecordPermission.denied:
print("denied")
hasPermissions = false
case AVAudioSession.RecordPermission.undetermined:
print("undetermined")
AVAudioSession.sharedInstance().requestRecordPermission() { [unowned self] allowed in
DispatchQueue.main.async {
if allowed {
self.hasPermissions = true
} else {
self.hasPermissions = false
}
}
}
default:()
}
result(hasPermissions)
default:
result(FlutterMethodNotImplemented)
}
}
}Dart调用部分
通过判断平台，Platform.isIOS,
给 iOS 设备，增加完善的功能
@override
Widget build(BuildContext context) {
final VoidCallback tapFirst;
if (Platform.isAndroid && name == kEnd) {
tapFirst = _audioEnd;
} else {
tapFirst = _audioGoOn;
}
List<Widget> views = [
ElevatedButton(
child: Text(
name,
style: Theme.of(context).textTheme.headline4,
),
onPressed: tapFirst,
)
];
if (Platform.isIOS && name != kStarted) {
views.add(SizedBox(height: 80));
views.add(ElevatedButton(
child: Text(
kEnd,
style: Theme.of(context).textTheme.headline4,
),
onPressed: _audioEnd,
));
}
return Scaffold(
appBar: AppBar(
// Here we take the value from the MyHomePage object that was created by
// the App.build method, and use it to set our appbar title.
title: Text(widget.title),
),
body: Center(
// Center is a layout widget. It takes a single child and positions it
// in the middle of the parent.
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: views,
),
), // This trailing comma makes auto-formatting nicer for build methods.
);
}到此这篇关于Android使用Flutter实现录音插件的文章就介绍到这了,更多相关Android Flutter录音内容请搜索脚本之家以前的文章或继续浏览下面的相关文章希望大家以后多多支持脚本之家！