Missing piece in upgrade guide to 0.59

[mehulmpt]

Local development builds fail with targetSdkVersion 28 because starting from Android 9, clearText support is disabled (https://developer.android.com/training/articles/security-config#CleartextTrafficPermitted). It is not mentioned anywhere in the docs, maybe we could include it somewhere?

To make sure the app is able to communicate with metro bundler, you need to add android:usesCleartextTraffic="true" to your AndroidManifest.xml file so it should finally look something like:

 <application
      android:name=".MainApplication"
      //...
      android:icon="@mipmap/ic_launcher"
	  android:usesCleartextTraffic="true" <-- add this
    // ....
>

If you don't add this, your app would build and launch but would fail with the following screen:

[ehsan680]

Throws the same error for me even after adding android:usesCleartextTraffic="true"in AndroidManifest.xml

[mehulmpt]

@ehsan680 did you rebuild the app?

[ehsan680]

Yes, have cleared cache etc and have rebuild the app. App still works fine in release build though.

[Salakar]

Hey all 👋 this was documented here: https://facebook.github.io/react-native/docs/integration-with-existing-apps#network-security-config-api-level-28 (android tab)

I'll close this for now but I'll see if I can get this added to the release notes/upgrade guide also.

EDIT: I've sent a PR to update the documentation to using usesCleartextTraffic facebook/react-native-website#847