How I Reduced the Size of My React Native App by 86%
I borrowed 25$ from my friend to start a Play Store Developer account to put up my first app. I had already created the app, created the assets and published it in the store. Nobody wants to download a todo list app that costs 25mb of bandwidth and another 25 MB of storage space.
So today I am going to share with you how I reduced the size of Tet from 25 MB to around 3.5 MB.
I love everything about Expo except the size of the binaries. Each binary weighs around 25 MB regardless of your app.
So the first thing I did was to migrate my existing Expo app to React Native.
Migrating to React Native
react-native inita new project with the same name
- Copy the source files over from Expo project
- Install all dependencies of the Expo project except Expo specific libraries.
- Make neccesary adjustments to
- Copy over your
.gitfolder into the new project.
Download the signing key of your Android app from Expo using
exp fetch:android:keystoreand set it up
- Build and test your app
This reduces the size to around 7.5 MB, thin but we can go thinner.
Reducing size of React Native App (Android)
This is what you have been waiting for, I know.
- Open up
def enableProguardInReleaseBuilds = truethis would enable Progaurd to compress the Java Bytecode. This reduces the app size by a tad bit
def enableSeparateBuildPerCPUArchitecture = true. Android devices support two major device artitectures armebi and x86. By default RN builds the native librariers for both these artitectures into the same apk.
Setting the last function creates two distinct apk in the build folder. You have to upload both of this apk to Play Store and Google would take care of distributing the app to the correct architectures.
Using this split generates version numbers for both apks in the order of 104856 and such. This is auto-generated by the build to avoid version conflicts, so don’t freak out (I did).
This split reduced the apk size from around 7MB to 3.5MB for arm and 5MB for x86 respectively.
So that’s how you lose weight. Reducing the size of your app has many added benefits, the best being more users will be willing to download your app.
Be sure to check out https://www.producthunt.com/posts/tet if you feel like seeing slim stuff.