When a “Simple” GPS Camera App Wasn’t Simple at All

I remember sitting late one night, testing the app on a low-end Android phone. I tapped the capture button, waited… and the photo came out late, with slightly wrong GPS coordinates. I tried again, and it lagged even more.

That’s when I stopped and thought — something isn’t right.

The moment everything changed

I went into this project thinking I was building a simple GPS camera app. You know… open camera, take photo, stamp location, done.

But that assumption didn’t last long.

Because once you start combining camera capture + GPS timing + image processing, you’re no longer building a simple app. You’re dealing with coordination between multiple systems that don’t naturally sync well.

And if you’ve ever worked on something like this, you probably know exactly what I mean.

Here’s the thing

When you rely fully on a framework, you’re trusting it to handle complexity for you. And most of the time, that works.

But when you need precise control — like capturing GPS at the exact moment of image capture — you start to notice limitations.

I learned this the hard way.

You can’t treat every part of your app equally. Some parts are UI-driven. Others are performance-critical. And you have to make that distinction early, or you’ll feel it later.

Rethinking the approach

So I changed direction.

I kept Flutter for the UI because it’s fast, flexible, and honestly great for building product screens. But I moved the core pieces — camera handling, GPS synchronization, and image processing — into native Kotlin.

And that decision changed everything.

Actually… let me rephrase that.

It didn’t make things easier immediately. But it gave me control. And that control is what allowed me to fix the real problems.

What the numbers actually said

I didn’t want to rely on “it feels faster,” so I started tracking things using Flutter DevTools and some internal logging.

Here’s what I saw after restructuring the architecture:

Camera startup time

Before: ~1.8s – 2.4s
After: ~0.7s – 1.1s

Capture latency (tap → saved image)

Before: ~450ms – 700ms
After: ~120ms – 220ms

Preview performance (low-end devices)

Before: frequent drops below ~40 FPS
After: stable ~55–60 FPS

Memory behavior after multiple captures

Before: noticeable spikes and GC pauses
After: much more stable usage

GPS accuracy at capture moment

Before: slight delay or drift
After: consistent and aligned with capture timing

These weren’t lab tests. Just real-world usage across different Android devices.

What you should take from this

If you’re building something that involves real-time data, especially camera or GPS, you can’t just assume it’ll behave consistently across devices.

You need to:

test on low-end devices, not just your own phone
question delays and inconsistencies early
measure performance instead of guessing
separate UI concerns from system-level work

Because if you don’t, you’ll end up chasing bugs that are actually architectural decisions.

A few real examples

There were moments where everything “worked”… but didn’t feel right.

The capture felt slightly delayed
GPS data was just a bit off
Memory usage increased after repeated photos

Individually, they didn’t seem critical. But together, they broke the experience.

And that’s the tricky part.

Small issues in isolation don’t look serious. But combined, they define how your app actually feels.

One thing I didn’t expect

Simple-looking apps are often the most deceptive.

Because you’re not solving what the user sees. You’re solving what happens underneath — timing, memory, hardware interaction.

It’s a bit like trying to take a perfectly timed photo while multiple systems are slightly out of sync. Everything works… just not when it should.

If you’re building something similar

If you’re working on a camera, GPS, or real-time app, take a step back and ask yourself:

Are you solving the visible problem… or the actual one?

If you’re curious how this approach turned out in a real project, you can take a look here (just for reference, not a pitch):

Spare some time and try it: GPS Camera App

Disclaimer: The link is shared purely to experience Flutter performance in a real-world scenario—it’s nearly on par with native (~98%). This project was developed for a client.