It seems that your device does not support camera(or it is locked)

[雕·不懒惰]

opencv人脸识别，在手机上没问题
安装到Android5.1, 7.1板子上都出现这种情况
外接的USB摄像头，系统相机是正常的
权限都有添加

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.RECORD_AUDIO" />
<uses-permission android:name="android.permission.CAMERA" />

<uses-feature android:name="android.hardware.camera" />
<uses-feature android:name="android.hardware.camera.autofocus" />
<uses-feature android:name="android.hardware.camera.front" />
<uses-feature android:name="android.hardware.camera.front.autofocus" />

[ink_s]

代码看看相机个数 Camera.getNumberOfCameras() 有可能你代码打开的是前置相机，但是USB识别为后置 int numberOfCameras = Camera.getNumberOfCameras(); if (numberOfCameras > 0) { mCamera = Camera.open(0); }

[雕·不懒惰]

自己SB了，代码里写死了设置前置摄像头