There are many different variations of this pattern. In particular, “MVC” in the context of a web application is interpreted somewhat differently to “MVC” in the context of a thick client (e.g. desktop) application (because a web application has to sit atop the request-response cycle). This is just one approach to implementing MVC in the … Read more
As you’ve discovered, the Model–View–Controller pattern is no panacea, but it offers some advantages. Rooted in MVC, the Swing separable model architecture is discussed in A Swing Architecture Overview. Based on this outline, the following example shows an MVC implementation of a much simpler game that illustrates similar principles. Note that the Model manages a … Read more
Yes, it’s possible. Just implement getItemViewType(), and take care of the viewType parameter in onCreateViewHolder(). So you do something like: public class MyAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> { class ViewHolder0 extends RecyclerView.ViewHolder { … public ViewHolder0(View itemView){ … } } class ViewHolder2 extends RecyclerView.ViewHolder { … public ViewHolder2(View itemView){ … } @Override public int getItemViewType(int position) { … Read more
The grid, pack and place functions of the Entry object and of all other widgets returns None. In python when you do a().b(), the result of the expression is whatever b() returns, therefore Entry(…).grid(…) will return None. You should split that on to two lines like this: entryBox = Entry(root, width=60) entryBox.grid(row=2, column=1, sticky=W) That … Read more
I’m just wondering whether it is good practice to use multiple JFrames? Bad (bad, bad) practice. User unfriendly: The user sees multiple icons in their task bar when expecting to see only one. Plus the side effects of the coding problems.. A nightmare to code and maintain: A modal dialog offers the easy opportunity to … Read more
Model-View-Presenter In MVP, the Presenter contains the UI business logic for the View. All invocations from the View delegate directly to the Presenter. The Presenter is also decoupled directly from the View and talks to it through an interface. This is to allow mocking of the View in a unit test. One common attribute of … Read more
What is the difference between “px”, “dip”, “dp” and “sp”?
Below is partially fixed part of the code which causes problems. Next time include full error code, and try to show only relevant part of the code. ActionListener listener = new ActionListener() { public void actionPerformed (ActionEvent e) { float P,r,t,result ; //P = Float.parseFloat(P.getText()); // P makes no sens here – its float !!! … Read more
http://cocoacontrols.com is a good starting point for that.
Just to get you started, you could have a look at Fragments (and Activity‘s) or perhaps even a ViewPager. All these tips require a certain base knowledge on Android, though, just as @aneal commented on your question.