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?

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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.

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