How to "put everything together" in Android app?

Question

Im learning Android and writing my first big application. It is client-server app and it uses Google login mechanism and will use Facebook login in future.

I wrote fundamental parts of app, like "Login with Google", connection with web service, few Activities that do something.

Now I have problem: how to put everything together?

Where should I store "application state", like current user e-mail or information if he is logged in or not? Now such data is inside "ActivityGoogleLogin" class which is destroyed after user logs in.

Another problem - lets say I have something like "MyHttpClient" object and I want to access it from every Activity. How to deal with this?

In C# (which is my background) I just create static class that holds my application state and it's easy to access it from everywhere.

I know that in Java something like "singleton" exists, but I don't know how to use it. It seems to be more complicated than C# static class where I don't even have to write accessors and I don't have to initialize it.

For storing simple information, you can use `SharedPreferences`. — Code-Apprentice, Oct 25 '14 at 05:07
You can make a class with static parameters in Java. I'm not familiar with C# but I'm sure it's the same. The class itself can't be static, only its members but it works the same way. — Barodapride, Oct 25 '14 at 05:07
@Barodapride While this is possible, it's not very OO friendly. And it isn't persistent. — Code-Apprentice, Oct 25 '14 at 05:08
When I have class with static parameters - do I have to instantinate it? Where should I initialize it? In main Activity? — Kamil, Oct 25 '14 at 05:13
@Code-Apprentice I need to store complicated objects, not simple information. — Kamil, Oct 25 '14 at 05:15
@Kamil "email" and "logged in" doesn't sound like complicated objects. — Code-Apprentice, Oct 25 '14 at 05:49
I suggest you read [Storage Options](http://developer.android.com/guide/topics/data/data-storage.html). — Code-Apprentice, Oct 25 '14 at 05:50
@Code-Apprentice I want to put there whole MyHttpClient class there. — Kamil, Oct 25 '14 at 07:53
@Kamil What is `MyHttpClient`? Can you post some code to show what you want to do? — Code-Apprentice, Oct 25 '14 at 07:54

score 1 · Answer 1 · answered Oct 25 '14 at 07:56

Another problem - lets say I have something like "MyHttpClient" object and I want to access it from every Activity.

If every Activity needs a HTTP connection, they should each create their own instance of MyHttpClient rather than trying to share the same object between different activities.

How to "put everything together" in Android app?

1 Answers1