# Tutorial #2: How to add the second mini app to an outer android app

This post is the 2nd one in a series of posts on Electrode Native.

It assumes that one has already completed the steps in Tutorial #1 here - https://gist.github.com/hemanth-manoharan/edb363d575d5c9ab22cbc93b595b8fba

- First, create a second mini-app and publish it to npm as we did in the previous tutorial. 

Assuming that the 2nd app is named `app2-miniapp`

- Now add the second mini app to the cauldron

`ern cauldron add miniapps app2-miniapp@0.0.1`

- Now, create the composite container locally again using the cauldron metadata

`ern create-container -d ErnOuterApp:android:0.0.1 -p android`

- Now, cd to `~/.ern/containergen/out/android` folder as before and run the gradle build to create the .aar file.

`./gradlew build`

- Now, copy over the updated `lib-debug.aar` to the `libs` folder of the `ErnOuterApp` android project

- Then, add a new button to trigger the `App2MiniappActivity` and test out the app with both the buttons

# Update app2 alone and re-publish

- Now, try to publish a new version of app2 and rebuild the outer-app with the original app1 and updated app2.

- First, make some change in `app2-miniapp`, update the version in `package.json` to `0.0.3` and re-publish the same to npm

- Now, update the cauldron with the new version of app2. 
**Note**: We are choosing not to update the native app version in this case but we are bumping up the container version.

`ern cauldron update miniapps app2-miniapp@0.0.2 -d ErnOuterApp:android:0.0.1 -v 1.0.1`

- Now, create the container locally again using the cauldron metadata.

`ern create-container -d ErnOuterApp:android:0.0.1 -p android`

- Now, srun the gradle build to create the updated .aar file.

- Then, copy over the updated `lib-debug.aar` to the `libs` folder of the `ErnOuterApp` android project

- Then, test out the app with both the buttons and check if app2 has the changes.

- **TODO** There are a lot of crashes in the navigation across App1, App2 and the outer-app. Need to investigate the same.