扫码进入详情页面熄屏几分钟，然后再回退无法重启扫描

[StarOfLife]

rt 。调用_key.currentState.startScan();扫码页面依旧处于假死状态。
日志报 startPreview: attempt to use a locked camera from a different process (old pid 0, new pid 28876)
Failed to handle method call java.lang.RuntimeException: startPreview failed at android.hardware.Camera.startPreview(Native Method)。抛出异常Unhandled Exception: PlatformException(error, startPreview failed, null)