在update中做了一个进度条的驱动，成功预加载了下个场景，就从80%进度点跳出完成进度
现在x21a上就会出现卡进度点的问题
creator2.3.2
报错日志：
java.io.FileNotFoundException: /sys/class/android_usb/android0/functions (No such file or directory)
at java.io.FileInputStream.open0(Native Method)
at java.io.FileInputStream.open(FileInputStream.java:231)
at java.io.FileInputStream.(FileInputStream.java:165)
at android.os.FileUtils.readTextFile(FileUtils.java:514)
at com.android.server.usb.UsbDeviceManager$UsbHandler.dump(UsbDeviceManager.java:1432)
at com.android.server.usb.UsbDeviceManager.dump(UsbDeviceManager.java:2295)
at com.android.server.usb.UsbService.dump(UsbService.java:538)
at android.os.Binder.doDump(Binder.java:578)
at android.os.Binder.dump(Binder.java:568)
at android.os.Binder.onTransact(Binder.java:518)
at android.hardware.usb.IUsbManager$Stub.onTransact(IUsbManager.java:434)
at android.os.Binder.execTransact(Binder.java:750)
[2020-09-02 11:52:26.774] [1539] [4299] [6] [UsbDebuggingManager] : Cannot read system keys
java.io.FileNotFoundException: /adb_keys (No such file or directory)
at java.io.FileInputStream.open0(Native Method)
at java.io.FileInputStream.open(FileInputStream.java:231)
at java.io.FileInputStream.(FileInputStream.java:165)
at android.os.FileUtils.readTextFile(FileUtils.java:514)
at com.android.server.usb.UsbDebuggingManager.dump(UsbDebuggingManager.java:491)
at com.android.server.usb.UsbDeviceManager.dump(UsbDeviceManager.java:2298)
at com.android.server.usb.UsbService.dump(UsbService.java:538)
at android.os.Binder.doDump(Binder.java:578)
at android.os.Binder.dump(Binder.java:568)
at android.os.Binder.onTransact(Binder.java:518)
at android.hardware.usb.IUsbManager$Stub.onTransact(IUsbManager.java:434)
at android.os.Binder.execTransact(Binder.java:750)