android usb没有读写节点,【记录】android中UsbManager的getDeviceList始终为空：检测不到插入的USB设备...

MainActivity.java部分代码如下：View.OnClickListener listener = new View.OnClickListener()

{

@Override

public void onClick(View v)

{

if (v == buttonGetDevices)

{

UsbManager manager = (UsbManager) getSystemService(Context.USB_SERVICE);

HashMap deviceList = manager.getDeviceList();

Log.i(TAG, "get device list = " + deviceList.size());

m_TxtVIewOfDeviceSize.setText(tv.getText() + "Device size:" + deviceList.size() + "\n");

Iterator deviceIterator = deviceList.values().iterator();

while (deviceIterator.hasNext())

{

UsbDevice device = deviceIterator.next();

Log.i(TAG, "device name = " + device.getDeviceName());

}

}

}

};

AndriodManifest.xml 文件部分代码如下：