首页 \ 问答 \ 在java中这是什么类型的变量声明(What type of variable declaration is this in java)

在java中这是什么类型的变量声明(What type of variable declaration is this in java)

class FreshJuice {
   enum FreshJuiceSize{ SMALL, MEDIUM, LARGE }
   FreshJuiceSize size;
}

 

 什么类型的变量是size ？ 
 

 是FreshJuiceSize size; 将size声明为实例变量的shorhand方式？ 

class FreshJuice {
   enum FreshJuiceSize{ SMALL, MEDIUM, LARGE }
   FreshJuiceSize size;
}

 

What type of variable is size ?
 

Is FreshJuiceSize size; a shorhand way of declaring size as a instance variable ?

原文：https://stackoverflow.com/questions/41821812
更新时间：2022-01-02 14:01

最满意答案

 您必须通过usb manager连接usb，这应该在获得该usb的许可后发生 
 

UsbManager manager = (UsbManager) this.getSystemService(Context.USB_SERVICE);
UsbDeviceConnection connection = manager.openDevice(device);

 

 获取接口和端点 
 

UsbEndpoint epIN = null;
 UsbEndpoint epOUT = null;
 UsbInterface usbIf = dev.getInterface(0); // inter will change according to usb 0/1 etc..

 for (int i = 0; i < usbIf.getEndpointCount(); i++) {            
    if (usbIf.getEndpoint(i).getType() == UsbConstants.USB_ENDPOINT_XFER_BULK){                 
         if (usbIf.getEndpoint(i).getDirection() == UsbConstants.USB_DIR_IN)
              epIN = usbIf.getEndpoint(i);
              else
               epOUT = usbIf.getEndpoint(i);
          } else {
               Log.d("USB","Not Bulk");
              }
         }

 

 将文本传输到usb 
 

byte[] str = get.getBytes("TEXT");
connection.bulkTransfer(epOUT, str, str.length, 500);

 

 希望能帮助到你。 

You have to connect the usb via usb manager this should happen after permission granted for that usb
 

UsbManager manager = (UsbManager) this.getSystemService(Context.USB_SERVICE);
UsbDeviceConnection connection = manager.openDevice(device);

 

get Interface and End points
 

UsbEndpoint epIN = null;
 UsbEndpoint epOUT = null;
 UsbInterface usbIf = dev.getInterface(0); // inter will change according to usb 0/1 etc..

 for (int i = 0; i < usbIf.getEndpointCount(); i++) {            
    if (usbIf.getEndpoint(i).getType() == UsbConstants.USB_ENDPOINT_XFER_BULK){                 
         if (usbIf.getEndpoint(i).getDirection() == UsbConstants.USB_DIR_IN)
              epIN = usbIf.getEndpoint(i);
              else
               epOUT = usbIf.getEndpoint(i);
          } else {
               Log.d("USB","Not Bulk");
              }
         }

 

Transfer text to usb
 

byte[] str = get.getBytes("TEXT");
connection.bulkTransfer(epOUT, str, str.length, 500);

 

hope it helps.

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