Fragnums
An enum based library to replace fragments, because #perfmatters.
“Frag your app complexity today!” - Zach K.
We all know that Fragments suck, and that #enumsmatter. What if we could replace Fragments with Enums?
What's Fragnums?
Fragnums is the smallest, simplest and most performant Android backstack library:
- No reflection, unlike Fragments which are recreated through reflection.
- Each enum value is both a screen and a presenter. This means only one instance of each value is created, ever. No useless garbage collection!
- Synchronous transitions coz ain't nobody got time for Async Fragment Transactions.
- Handles configuration changes, for all the landscape nut lovers out there.
Show me the code
Creating a new screen is as simple as adding an enum value:
MY_SCREEN(R.layout.my_screen_layout, R.string.my_screen_title) {
@Override protected void onBind() {
View button = findViewById(R.id.button);
button.setOnClickListener(new View.OnClickListener() {
@Override public void onClick(View view) {
// Do something.
}
});
}
},
Then you can just do goTo(MY_SCREEN).
Getting started
- Copy the three classes from the example.
- You're good to go! You can now focus on writing new screens and features, just by adding new enum values.
Why should I use Fragnums?
- Ultra small footprint: no dependency. In fact, it's not even a library, just three classes to copy.
- It's really hard to test, so test zealots can't force you to write tests. You can therefore focus on writing more features.
- All your business logic is in one place, so it's really easy to have a 30,000 feet picture of your code. We suggest you start using a smaller font size in your IDE.
How does it work?
Is this serious?
No. The core principles are good, but this is a satire library. Read the code and see for yourself.
More details
- The suggestion that we should stop using enums because #perfmatters is a fallacy. An enum is essentially a class. Every new class makes our binary a bit bigger and our runtime a bit slower. Should we stop using classes? Or should we instead focus on the perf problems that actually matter?
- This library shows how to implement a very basic backstack. You don't need enums for that, you could have a
Screen class instead.
- It's cool to know that one could make an enum centric app. However just because you can, doesn't mean you should.
- If you're into trolling at conferences, you can get the #enumsmatter T-Shirt here. I am not affiliated with this T-Shirt campaign.
