Fixed algorithm for obtaining permission to communicate with USB device....

Fixed algorithm for obtaining permission to communicate with USB device. Obtaining permission algorithm is encapsulated in FTDI Class D2xxManager. So we had to implement Activity.onResume() in our application. In onResume() method, we create a trend for automatic connection just in case that connected  device have obtained permition. On device close we have destroy a trend for automatic connection.
class DlReader v1.7
- Added method getNumOfDlDevices()
example (app) v1.7


git-svn-id: svn://192.168.1.162/sw_open/ufr/android/examples/trunk/block_read@59 bc32c577-c6d7-4b02-862b-52b34d7f137c