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【Android】FragmentにComposeViewを乗っける場合は、ViewCompositionStrategyを指定しなければいけない【Jetpack Compose】

Last updated at Posted at 2024-01-12

はじめに

無限に忘れてしまうので、戒めの記事を書きます。

公式ドキュメントのこの部分についてです。

本題

FragmentやカスタムViewでComposeViewを使用する場合は、それらのライフサイクルに合わせてCompositionを破棄する必要があります。
それを実現してくれるのが、ViewCompositionStrategyになります。

公式のサンプル
setViewCompositionStrategy(ViewCompositionStrategy.DisposeOnViewTreeLifecycleDestroyed)
setContent {
    MaterialTheme {
        // In Compose world
        Text("Hello Compose!")
    }
}

デフォルトではDisposeOnDetachedFromWindowOrReleasedFromPoolが使用されているので、DisposeOnViewTreeLifecycleDestroyed、またはDisposeOnLifecycleDestroyedを使ってあげるようにしましょう。

まとめ

  • FragmentやカスタムViewの上にComposeViewを乗っける場合は、ViewCompositionStrategyを指定しよう。

おわり。

おまけ

DisposeOnViewTreeLifecycleDestroyedは一番近いlifecycleOwnerを、DisposeOnLifecycleDestroyedは渡したlifecycleOwnerを使う。
明示的にlifecycleOwnerを指定したい場合はDisposeOnLifecycleDestroyedを、そうじゃない場合はDisposeOnViewTreeLifecycleDestroyedを使うとよさそう。

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