UsbInterface usbInterface = usbDevice.getInterface(0);
//USBEndpoint为读写数据所需的节点
UsbEndpoint inEndpoint = usbInterface.getEndpoint(0);  //读数据节点
UsbEndpoint outEndpoint = usbInterface.getEndpoint(1); //写数据节点
UsbDeviceConnection connection = usbManager.openDevice(usbDevice);
connection.claimInterface(usbInterface, true);

//发送数据
byte[] byte2 = new byte[64];
int out = connection.bulkTransfer(outEndpoint, cmd, cmd.length, 3000);

//读取数据1   两种方法读取数据
int ret = connection.bulkTransfer(inEndpoint, byte2, byte2.length, 3000);
Log.e("ret", "ret:"+ret);
for(Byte byte1 : byte2){
    System.err.println(byte1);
}

//读取数据2
/*int outMax = outEndpoint.getMaxPacketSize();
int inMax = inEndpoint.getMaxPacketSize();
ByteBuffer byteBuffer = ByteBuffer.allocate(inMax);
UsbRequest usbRequest = new UsbRequest();
usbRequest.initialize(connection, inEndpoint);
usbRequest.queue(byteBuffer, inMax);
if(connection.requestWait() == usbRequest){
    byte[] retData = byteBuffer.array();
    for(Byte byte1 : retData){
        System.err.println(byte1);
    }
}*/

原文：

 

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