java - 媒体投影需要 Android Pie 和 Q 中 ServiceInfo.FOREGROUND_SERVICE TYPE_MEDIA_PROJECTION 类型的前台服务

Question

任何人都知道为什么会发生此错误，媒体投影需要 getMediaProjection() 上的 ServiceInfo.FOREGROUND_SERVICE_TYPE_MEDIA_PROJECTION 类型的前台服务，即使我在调用 startforeground() 方法后调用 getMediaProjection() 方法..!

堆栈跟踪是:

  Process: com.al1.screenrecorder, PID: 24641
java.lang.RuntimeException: Unable to start service com.al1.screenrecorder.service.DisplayRecorderService@9ef2101 with Intent { cmp=com.al1.screenrecorder/.service.DisplayRecorderService (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:4661)
    at android.app.ActivityThread.access$2900(ActivityThread.java:292)
    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2246)
    at android.os.Handler.dispatchMessage(Handler.java:107)
    at android.os.Looper.loop(Looper.java:213)
    at android.app.ActivityThread.main(ActivityThread.java:8147)
    at java.lang.reflect.Method.invoke(Native Method)
    at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:513)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1101)
 Caused by: java.lang.SecurityException: Media projections require a foreground service of type ServiceInfo.FOREGROUND_SERVICE_TYPE_MEDIA_PROJECTION
    at android.os.Parcel.createException(Parcel.java:2071)
    at android.os.Parcel.readException(Parcel.java:2039)
    at android.os.Parcel.readException(Parcel.java:1987)
    at android.media.projection.IMediaProjection$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.al1.screenrecorder.service.DisplayRecorderService.createMediaProjection(DisplayRecorderService.java:118)
    at com.al1.screenrecorder.service.DisplayRecorderService.onStartCommand(DisplayRecorderService.java:107)
    at android.app.ActivityThread.handleServiceArgs(ActivityThread.java:4641)
    at android.app.ActivityThread.access$2900(ActivityThread.java:292) 
    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2246) 
    at android.os.Handler.dispatchMessage(Handler.java:107) 
    at android.os.Looper.loop(Looper.java:213) 
    at android.app.ActivityThread.main(ActivityThread.java:8147) 
    at java.lang.reflect.Method.invoke(Native Method) 
    at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:513) 
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1101) 
 Caused by: android.os.RemoteException: Remote stack trace:
    at com.android.server.media.projection.MediaProjectionManagerService$MediaProjection.start(MediaProjectionManagerService.java:498)
    at android.media.projection.IMediaProjection$Stub.onTransact(IMediaProjection.java:135)
    at android.os.Binder.execTransactInternal(Binder.java:1028)
    at android.os.Binder.execTransact(Binder.java:1001)

强文本 私有(private)无效startForeground() {

    Intent activityIntent = new Intent(this, MainActivity.class);
    activityIntent.setAction("stop");
    PendingIntent contentIntent = PendingIntent.getActivity(this, 0, activityIntent, PendingIntent.FLAG_UPDATE_CURRENT);

    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {

        String channelId = "001";
        String channelName = "myChannel";
        NotificationChannel channel = new NotificationChannel(channelId, channelName, NotificationManager.IMPORTANCE_NONE);
        channel.setLightColor(Color.BLUE);
        channel.setLockscreenVisibility(Notification.VISIBILITY_PRIVATE);

        NotificationManager manager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);

        if (manager != null) {
            manager.createNotificationChannel(channel);
            Notification notification = new Notification.
                    Builder(getApplicationContext(), channelId)
                    .setOngoing(true)
                    .setSmallIcon(R.mipmap.ic_launcher)
                    .setCategory(Notification.CATEGORY_SERVICE)
                    .setContentTitle(getString(R.string.ClickToCancel))
                    .setContentIntent(contentIntent)
                    .build();
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q) {
                startForeground(0, notification, ServiceInfo.FOREGROUND_SERVICE_TYPE_MEDIA_PROJECTION);
            } else {
                startForeground(0, notification);
            }
        }
    } else {
        startForeground(0, new Notification());
    }

}

onStartCommand 是:

public int onStartCommand(Intent intent, int flags, int startId) {
    Log.i(TAG, "Service onStartCommand() is called");

    startForeground();

    mResultCode = intent.getIntExtra("code", -1);
    mResultData = intent.getParcelableExtra("data");
    mScreenWidth = intent.getIntExtra("width", 720);
    mScreenHeight = intent.getIntExtra("height", 1280);
    mScreenDensity = intent.getIntExtra("density", 1);
    isVideoSd = intent.getBooleanExtra("quality", true);
    isAudio = intent.getBooleanExtra("audio", true);


    mMediaProjection = createMediaProjection();
    mMediaRecorder = createMediaRecorder();
    mVirtualDisplay = createVirtualDisplay();
    mMediaRecorder.start();

    return Service.START_STICKY;
}

并且 getMediaProjection 上的此方法存在异常:

 private MediaProjection createMediaProjection() {
    Log.i(TAG, "Create MediaProjection");
    return ((MediaProjectionManager) Objects.requireNonNull(getSystemService(Context.MEDIA_PROJECTION_SERVICE))).
            getMediaProjection(mResultCode, mResultData);
}

Answer 1

添加android:foregroundServiceType="mediaProjection"到<service>您的服务 list 中的元素。