Download operation is an async task in android. So our download function must extends AsyncTask class. My download example will be with a progress bar because i want to follow download operation. For see progress bar i used a Dialog.
Bootstrap is a back-end framework which is developed by Twitter. It has a grid system for make responsive web design. This system divides 12 part to page. In this way we can design web pages with mobile first principle. There are classes for every screen size:
We create a test database and create a table (for example: user). Then We add some data to it.