Android 10 在使用MediaProjectionManager录音的时候报错：

java.lang.SecurityException: Media projections require a foreground service of type ServiceInfo.FOREGROUND_SERVICE_TYPE_MEDIA_PROJECTION

错误详细信息如下，看了网上很多相关的解决介绍，但是都没有太多的用处要么就是不是太清楚。这里说下解决的几个关键点，希望对大家有所帮助

2021-09-25 20:17:32.007 4032-4032/? E/AndroidRuntime: FATAL EXCEPTION: main
    Process: com.demo.audiocapture, PID: 4032
    java.lang.RuntimeException: Unable to start service com.demo.audiocapture.AudioCaptureService@403e26c with Intent {
    
     cmp=com.demo.audiocapture/.AudioCaptureService (has extras) }: java.lang.SecurityException: Media projections require a foreground service of type ServiceInfo.FOREGROUND_SERVICE_TYPE_MEDIA_PROJECTION
        at android.app.ActivityThread.handleServiceArgs(ActivityThread.java:4971)
        at android.app.ActivityThread.access$3300(ActivityThread.java:260)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2486)
        at android.os.Handler.dispatchMessage(Handler.java:110)
        at android.os.Looper.loop(Looper.java:219)
        at android.app.ActivityThread.main(ActivityThread.java:8668)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:513)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1109)
     Caused by: java.lang.SecurityException: Media projections require a foreground service of type ServiceInfo.FOREGROUND_SERVICE_TYPE_MEDIA_PROJECTION
        at android.os.Parcel.createException(Parcel.java:2090)
        at android.os.Parcel.readException(Parcel.java:2058)
        at android.os.Parcel.readException(Parcel.java:2006)
        at android.media.projection.IMediaProjection$Stub$Proxy.start(IMediaProjection.java:231)
        at android.media.projection.MediaProjection.<init>(MediaProjection.java:75)
        at android.media.projection.MediaProjectionManager.getMediaProjection(MediaProjectionManager.java:104)
        at com.demo.audiocapture.AudioCaptureService.onStartCommand(AudioCaptureService.java:86)
        at android.app.ActivityThread.handleServiceArgs(ActivityThread.java:4951)
        at android.app.ActivityThread.access$3300(ActivityThread.java:260) 
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2486) 
        at android.os.Handler.dispatchMessage(Handler.java:110) 
        at android.os.Looper.loop(Looper.java:219) 
        at android.app.ActivityThread.main(ActivityThread.java:8668) 
        at java.lang.reflect.Method.invoke(Native Method) 
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:513) 
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1109) 
     Caused by: android.os.RemoteException: Remote stack trace:
        at com.android.server.media.projection.MediaProjectionManagerService$MediaProjection.start(libmapleservices.so:16625028)
        at android.media.projection.IMediaProjection$Stub.onTransact(libmapleframework.so:26979796)
        at android.os.Binder.execTransactInternal(libmapleframework.so:6246476)
        at android.os.Binder.execTransact(libmapleframework.so:6248272)
    callee: null 2075/4123

尝试了一下，最终解决。关键点如下(录音的代码不再这里黏贴了): 关键点1我在网上没找到有说明的，或者介绍的也不太清楚，关键点2网上有介绍说明

关键点1：关于通知的调用时机及调用方法

1> NotificationManager 显示通知时，必须要在getMediaProjection方法之前调用

@Override
    public void onCreate() {
    
    
        super.onCreate();
    }

    @Override
    public IBinder onBind(Intent intent) {
    
    
        // TODO: Return the communication channel to the service.
        throw new UnsupportedOperationException("Not yet implemented");
    }

    @RequiresApi(api = Build.VERSION_CODES.Q)
    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
    
    
        resultCode = intent.getIntExtra("resultCode", -1);
        resultData = intent.getParcelableExtra("data");
        Log.i(TAG, "onStartCommand: " + resultCode);
        Log.i(TAG, "onStartCommand: " + resultData);
        notification();//通知显示可以写到onCreate中。不管是写到onCreate里面还是onStartCommand中，都要写到getMediaProjection方法调用之前
        mediaProjectionManager = (MediaProjectionManager) getSystemService(MEDIA_PROJECTION_SERVICE);
        mediaProjection = mediaProjectionManager.getMediaProjection(resultCode, resultData);//必须在通知显示之后调用
        Log.i(TAG, "onStartCommand: " + mediaProjection);
        AudioPlaybackCaptureConfiguration.Builder builder = new AudioPlaybackCaptureConfiguration.Builder(mediaProjection);
        builder.addMatchingUsage(AudioAttributes.USAGE_MEDIA);//多媒体
        builder.addMatchingUsage(AudioAttributes.USAGE_ALARM);//闹铃
        builder.addMatchingUsage(AudioAttributes.USAGE_GAME);//游戏
        audioPlaybackCaptureConfiguration = builder.build();
        generateAudioRecord();
        return super.onStartCommand(intent, flags, startId);
    }

2> 必须使用 startForeground(NOTIFICATION_ID, notification) 显示通知，不能使用notificationManager.notify(NOTIFICATION_ID, notification);

public void notification() {
    
    
        Log.i(TAG, "notification: " + Build.VERSION.SDK_INT);
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
    
    
            //Call Start foreground with notification
            Intent notificationIntent = new Intent(this, AudioCaptureService.class);
            PendingIntent pendingIntent = PendingIntent.getActivity(this, 0, notificationIntent, 0);
            NotificationCompat.Builder notificationBuilder = new NotificationCompat.Builder(this, NOTIFICATION_CHANNEL_ID)
                    .setLargeIcon(BitmapFactory.decodeResource(getResources(), R.drawable.ic_launcher_foreground))
                    .setSmallIcon(R.drawable.ic_launcher_foreground)
                    .setContentTitle("Starting Service")
                    .setContentText("Starting monitoring service")
                    .setTicker(NOTIFICATION_TICKER)
                    .setContentIntent(pendingIntent);
            Notification notification = notificationBuilder.build();
            NotificationChannel channel = new NotificationChannel(NOTIFICATION_CHANNEL_ID, NOTIFICATION_CHANNEL_NAME, NotificationManager.IMPORTANCE_DEFAULT);
            channel.setDescription(NOTIFICATION_CHANNEL_DESC);
            NotificationManager notificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
            notificationManager.createNotificationChannel(channel);
            //notificationManager.notify(NOTIFICATION_ID, notification);
            startForeground(NOTIFICATION_ID, notification); //必须使用此方法显示通知，不能使用notificationManager.notify，否则还是会报上面的错误
        }
    }

关键点2 权限

<uses-permission android:name="android.permission.FOREGROUND_SERVICE" />

关键点3 service配置

清单文件(即AndroidManifest.xml)中配置服务的时候，需要加上 android:foregroundServiceType=“mediaProjection”

<service
            android:name=".AudioCaptureService"
            android:enabled="true"
            android:exported="true"
            android:foregroundServiceType="mediaProjection"
            />

代码git地址

参考
https://stackoverflow.com/questions/62004735/media-projections-require-a-foreground-service-of-type-serviceinfo-foreground-se
Android notification 适配不同版本
https://developer.android.google.cn/reference/kotlin/android/media/AudioPlaybackCaptureConfiguration
Android require a foreground service of type ServiceInfo.FOREGROUND_SERVICE
MediaProjections in Android Q（Media projections require a foreground service）
AudioPlaybackCapture（Android 10）无法正常工作并录制空声音