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Fix lifecycle handling bug (#3319)

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Fragments can go `onCreate` -> `onCreateView` -> `onViewCreated` -> `onDestroyView` without transitioning through `onStart`.

The previous code assumed `onStart` was always called. 

Se https://itnext.io/an-update-to-the-fragmentviewbindingdelegate-the-bug-weve-inherited-from-autoclearedvalue-7fc0a89fcae1
This commit is contained in:
Nik Clayton 2023-02-25 21:06:22 +01:00 committed by GitHub
parent c6f7ecdb5b
commit 4a0251800d
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GPG key ID: 4AEE18F83AFDEB23
1 changed files with 20 additions and 16 deletions
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36
app/src/main/java/com/keylesspalace/tusky/util/ViewBindingExtensions.kt
View file

@ -7,6 +7,7 @@ import androidx.fragment.app.Fragment
import androidx.lifecycle.DefaultLifecycleObserver
import androidx.lifecycle.Lifecycle
import androidx.lifecycle.LifecycleOwner
import androidx.lifecycle.Observer
import androidx.viewbinding.ViewBinding
import kotlin.properties.ReadOnlyProperty
import kotlin.reflect.KProperty
@ -28,23 +29,26 @@ class FragmentViewBindingDelegate<T : ViewBinding>(
private var binding: T? = null
init {
fragment.lifecycle.addObserver(
object : DefaultLifecycleObserver {
override fun onCreate(owner: LifecycleOwner) {
fragment.viewLifecycleOwnerLiveData.observe(
fragment
) { t ->
t?.lifecycle?.addObserver(
object : DefaultLifecycleObserver {
override fun onDestroy(owner: LifecycleOwner) {
binding = null
}
}
)
}
fragment.lifecycle.addObserver(object : DefaultLifecycleObserver {
val viewLifecycleOwnerLiveDataObserver =
Observer<LifecycleOwner?> {
val viewLifecycleOwner = it ?: return@Observer
viewLifecycleOwner.lifecycle.addObserver(object : DefaultLifecycleObserver {
override fun onDestroy(owner: LifecycleOwner) {
binding = null
}
})
}
override fun onCreate(owner: LifecycleOwner) {
fragment.viewLifecycleOwnerLiveData.observeForever(viewLifecycleOwnerLiveDataObserver)
}
)
override fun onDestroy(owner: LifecycleOwner) {
fragment.viewLifecycleOwnerLiveData.removeObserver(viewLifecycleOwnerLiveDataObserver)
}
})
}
override fun getValue(thisRef: Fragment, property: KProperty<*>): T {
@ -58,7 +62,7 @@ class FragmentViewBindingDelegate<T : ViewBinding>(
throw IllegalStateException("Should not attempt to get bindings when Fragment views are destroyed.")
}
return viewBindingFactory(thisRef.requireView()).also { this@FragmentViewBindingDelegate.binding = it }
return viewBindingFactory(thisRef.requireView()).also { this.binding = it }
}
}