Trying to implement Android USB Serial . I can not open the port.

MainActivity:

FTDriver mSerial; private static final String ACTION_USB_PERMISSION = "jp.ksksue.tutorial.USB_PERMISSION" protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); mSerial = new FTDriver((UsbManager)getSystemService(Context.USB_SERVICE)); PendingIntent permissionIntent = PendingIntent.getBroadcast(this, 0, new Intent( ACTION_USB_PERMISSION), 0); mSerial.setPermissionIntent(permissionIntent); if(!mSerial.begin(FTDriver.BAUD9600)) { Toast.makeText(MainActivity.this, "Error! Cannot connect!!!!", Toast.LENGTH_SHORT).show(); } . . . . String wbuf = "FTDriver Test."; mSerial.write(wbuf.getBytes());

FTDriver here

Jumps out "Error! Cannot connect !!!"

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