How do I enable multidex for react native?

For RN 0.59+ and using Gradle 3.4.1, none of the answers here had the complete solution. I did the following and it worked:

In android/app/build.gradle, update the dependency block:

dependencies {
    // ... your other dependencies

    // Multidex
    implementation 'com.android.support:multidex:1.0.3'
}

And also update the defaultConfig in the android block:

defaultConfig {
    // ... your `applicationId`, etc.
    multiDexEnabled true
}

In MainApplication.java, replace

import android.app.Application;

at the top with

import android.support.multidex.MultiDexApplication;

OR if you're on RN 0.60+ or have manually upgraded to AndroidX then use this instead:

import androidx.multidex.MultiDexApplication;

Still in MainApplication.java, replace

public class MainApplication extends Application implements ReactApplication {

with

public class MainApplication extends MultiDexApplication implements ReactApplication {

Found the answer somewhere else. It's no different than enabling it for any regular Android project.

android {
    ....
    defaultConfig {
        ...
        multiDexEnabled true
    }

As for method count, this site does the trick: http://inloop.github.io/apk-method-count/

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