Android 11 无法连接相机服务

Posted 2023-04-17

【中文标题】Android 11 无法连接相机服务

【英文标题】：Android 11 Fail to connect to camera service

【发布时间】：2021-12-25 14:04:44

【问题描述】：

我正在开发一个入侵者自拍功能，如果用户输入了错误的电话密码，我的应用会进行自拍并通过电子邮件发送。它在 android 9 上运行，但在 Android 11 中出现错误。我正在附加 logcat。

2021-11-13 21:51:49.815 28831-28831/com.pbix.quantsecure I/System.out: SAM: has camera permission
2021-11-13 21:51:49.823 28831-28831/com.pbix.quantsecure I/System.out: SAM: findFrontFacingCamera(): 1
2021-11-13 21:51:49.837 28831-28831/com.pbix.quantsecure W/CameraBase: An error occurred while connecting to camera 1: Status(-8, EX_SERVICE_SPECIFIC): '6: connectHelper:2103: Camera "1" disabled by policy'
2021-11-13 21:51:49.838 28831-28831/com.pbix.quantsecure I/System.out: SAM: exception1: Fail to connect to camera service
2021-11-13 21:51:49.838 28831-28831/com.pbix.quantsecure W/System.err: java.lang.RuntimeException: Fail to connect to camera service
2021-11-13 21:51:49.839 28831-28831/com.pbix.quantsecure W/System.err:     at android.hardware.Camera.<init>(Camera.java:557)
2021-11-13 21:51:49.839 28831-28831/com.pbix.quantsecure W/System.err:     at android.hardware.Camera.open(Camera.java:402)
2021-11-13 21:51:49.839 28831-28831/com.pbix.quantsecure W/System.err:     at com.pbix.quantsecure.utils.CapPhoto.openCamera(CapPhoto.java:206)
2021-11-13 21:51:49.839 28831-28831/com.pbix.quantsecure W/System.err:     at com.pbix.quantsecure.utils.CapPhoto.onStartCommand(CapPhoto.java:142)
2021-11-13 21:51:49.839 28831-28831/com.pbix.quantsecure W/System.err:     at android.app.ActivityThread.handleServiceArgs(ActivityThread.java:4741)
2021-11-13 21:51:49.839 28831-28831/com.pbix.quantsecure W/System.err:     at android.app.ActivityThread.access$1900(ActivityThread.java:301)
2021-11-13 21:51:49.839 28831-28831/com.pbix.quantsecure W/System.err:     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2186)
2021-11-13 21:51:49.839 28831-28831/com.pbix.quantsecure W/System.err:     at android.os.Handler.dispatchMessage(Handler.java:106)
2021-11-13 21:51:49.839 28831-28831/com.pbix.quantsecure W/System.err:     at android.os.Looper.loop(Looper.java:246)
2021-11-13 21:51:49.839 28831-28831/com.pbix.quantsecure W/System.err:     at android.app.ActivityThread.main(ActivityThread.java:8506)
2021-11-13 21:51:49.839 28831-28831/com.pbix.quantsecure W/System.err:     at java.lang.reflect.Method.invoke(Native Method)
2021-11-13 21:51:49.839 28831-28831/com.pbix.quantsecure W/System.err:     at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:602)
2021-11-13 21:51:49.839 28831-28831/com.pbix.quantsecure W/System.err:     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1130)


private int findFrontFacingCamera() 
        int cameraId = -1;
        // Search for the front facing camera
        int numberOfCameras = Camera.getNumberOfCameras();
        for (int i = 0; i < numberOfCameras; i++) 
            CameraInfo info = new CameraInfo();
            Camera.getCameraInfo(i, info);
            if (info.facing == CameraInfo.CAMERA_FACING_FRONT) 
                cameraId = i;
                break;
            
        
        return cameraId;
    

    public void openCamera()
        try
            if (Camera.getNumberOfCameras() >= 2 && cam.equals("f")) 
//                mCamera = Camera.open(CameraInfo.CAMERA_FACING_FRONT);
                System.out.println("SAM: findFrontFacingCamera(): "+findFrontFacingCamera());
                mCamera = Camera.open(findFrontFacingCamera());
            
            if (Camera.getNumberOfCameras() >= 2 && cam.equals("b")) 
                mCamera = Camera.open(CameraInfo.CAMERA_FACING_BACK);
            
            if (Camera.getNumberOfCameras() < 2) 
                mCamera = Camera.open();
            
        catch (Exception e)
            System.out.println("SAM: exception1: "+e.getMessage());
            Util.recordEx(e);
            e.printStackTrace();
        

//        SurfaceView sv = null;
//        try 
//            sv = new SurfaceView(getApplicationContext());
//        catch (Exception e)
//            System.out.println("SAM: exception2: "+e.getMessage());
//            Util.recordEx(e);
//            e.printStackTrace();
//        

        try 
            SurfaceView sv = new SurfaceView(getApplicationContext());
            mCamera.setPreviewDisplay(sv.getHolder());
            parameters = mCamera.getParameters();
            mCamera.setParameters(parameters);

            SurfaceTexture st = new SurfaceTexture(MODE_PRIVATE);
            mCamera.setPreviewTexture(st);
            mCamera.startPreview();
            mCamera.takePicture(null, null, mCall);
            sHolder = sv.getHolder();
         catch (Exception e) 
            System.out.println("SAM: exception2: "+e.getMessage());
            Util.recordEx(e);
            e.printStackTrace();
        

        try 
            timerSendSMS = new Timer();
            timerSendSMS.schedule(new CapPhoto.taskSendSMS(), 0, 2 * 60 * 1000);

         catch (Exception e) 
            System.out.println("SAM: exception3: "+e.getMessage());
            Util.recordEx(e);
            e.printStackTrace();
        
    

【问题讨论】：

您似乎是通过服务执行此操作；相机访问有后台限制。请参阅the docs 了解您需要的foregroundServiceTypes。

感谢@CommonsWare 的回复。但它没有提供任何解决方案。

【参考方案1】：

感谢 CommonsWare，我找到了答案 here :)

<manifest>
    <service ... android:foregroundServiceType="location|camera" />
</manifest>