Application's package can't find in Device?

I've successfully written a simple android database application, but I can't see and find my package on the device.

When, I'm using this application on my Device it doesn't show the database in my device's file manager.

What am I doing wrong? Also, what do I need to do to display my package on my device? Is there any

permission I开发者_如何学运维'm missing?

It is very simple to open database in android device . Just copy it from data/data directory to sdcard using code and then copy from sdcard to PC manually.

The database that an application creates is private to the application and cannot be seen from another application.