Programmatically trigger Android Back button - React Native

If you want to communicate from react native to adnroid, you should use Native modules.

See documentation https://reactnative.dev/docs/native-modules-android

In short:

1. Create a native module which handle backbutton from specific activity

class BackPressReactModule(reactContext: ReactApplicationContext?) : ReactContextBaseJavaModule(reactContext) {
    override fun getName(): String {
        return "BackPressReactModule"
    }

    @ReactMethod
    fun goBack() {
        val context = reactApplicationContext
        val currentActivity = context.currentActivity as Activity
        
        currentActivity.onBackPressed()
    }
}

2. Register BackPressReactModule into your packages in ReactNativeHost. (See documentation)
3. After successfully exposing module, you can call it from javascript like this:

import {NativeModules} from 'react-native';
const {BackPressReactModule} = NativeModules;

BackPressReactModule.goBack();