[android-components](../../index.md) / [mozilla.components.support.migration](../index.md) / [AbstractMigrationProgressActivity](index.md) / [onStart](./on-start.md)

# onStart

`protected open fun onStart(): `[`Unit`](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-unit/index.html) [(source)](https://github.com/mozilla-mobile/android-components/blob/master/components/support/migration/src/main/java/mozilla/components/support/migration/AbstractMigrationProgressActivity.kt#L29)