a19540f0e4This reduces complexity of view binding inflation in Fragments, and also reduces overhead (no `KProperty` objects need to be generated by the compiler) by implementing `Lazy` instead of `ReadOnlyProperty`. For a full explanation, see this [detailed blog post](https://medium.com/@bladecoder/viewlifecyclelazy-and-other-ways-to-avoid-view-memory-leaks-in-android-fragments-4aa982e6e579).
51 lines
1.7 KiB
Kotlin
51 lines
1.7 KiB
Kotlin
package com.keylesspalace.tusky.util
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import android.view.LayoutInflater
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import android.view.View
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import androidx.appcompat.app.AppCompatActivity
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import androidx.fragment.app.Fragment
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import androidx.lifecycle.Lifecycle
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import androidx.lifecycle.LifecycleEventObserver
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import androidx.lifecycle.LifecycleOwner
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import androidx.viewbinding.ViewBinding
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/**
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* Original code: https://medium.com/@Zhuinden/simple-one-liner-viewbinding-in-fragments-and-activities-with-kotlin-961430c6c07c
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* Refactor: https://bladecoder.medium.com/viewlifecyclelazy-and-other-ways-to-avoid-view-memory-leaks-in-android-fragments-4aa982e6e579
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*/
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inline fun <T : ViewBinding> AppCompatActivity.viewBinding(
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crossinline bindingInflater: (LayoutInflater) -> T
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) = lazy(LazyThreadSafetyMode.NONE) {
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bindingInflater(layoutInflater)
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}
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private class ViewLifecycleLazy<out T : Any>(
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private val fragment: Fragment,
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private val initializer: (View) -> T
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) : Lazy<T>, LifecycleEventObserver {
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private var cached: T? = null
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override val value: T
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get() {
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return cached ?: run {
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val newValue = initializer(fragment.requireView())
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cached = newValue
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fragment.viewLifecycleOwner.lifecycle.addObserver(this)
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newValue
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}
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}
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override fun isInitialized() = cached != null
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override fun toString() = cached.toString()
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override fun onStateChanged(source: LifecycleOwner, event: Lifecycle.Event) {
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if (event == Lifecycle.Event.ON_DESTROY) {
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cached = null
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}
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}
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}
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fun <T : ViewBinding> Fragment.viewBinding(viewBindingFactory: (View) -> T): Lazy<T> =
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ViewLifecycleLazy(this, viewBindingFactory)
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