Google Android - это несложно

werter писал(а):насколько нормальная это практика ?

If you looking at accessing the database, look at creating a database singleton.

So something like:

public class Database {

// This starts off null
private static Database mInstance;

/**
* Singleton method, will return the same object each time.
*/
public static final Database getInstance() {
// First time this method is called by Database.getInstance() from anywhere
// in your App. It will create this Object once.
if(mInstance == null) mInstance = new Database();
// Returns the created object from a statically assigned field so its never
// destroyed until you do it manually.
return mInstance;
}

//Private constructor to stop you from creating this object by accident
private Database(){
//Init db object
}

}
So then from your fragments and activities you can then place the following field in your class's (Better use use a base activity and fragment to save you repeating code).

public abstract class BaseFragment extends Fragment {

protected final Database mDatabase = Database.getInstance();

}