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ViewCompositionStrategy

ViewCompositionStrategy defines when the Composition should be disposed. The default, ViewCompositionStrategy.Default, disposes the Composition when the underlying ComposeView detaches from the window, unless it is part of a pooling container such as a RecyclerView. In a single-Activity Compose-only app, this default behavior is what you would want, however, if you are incrementally adding Compose in your codebase, this behavior may cause state loss in some scenarios.

To change the ViewCompositionStrategy, call the setViewCompositionStrategy() method and provide a different strategy.

There are four different options for ViewCompositionStrategy:

• DisposeOnDetachedFromWindow. The Composition will be disposed when the underlying ComposeView is detached from the window. Has since been superseded by DisposeOnDetachedFromWindowOrReleasedFromPool.

  Interop scenario:

  • ComposeView whether it’s the sole element in the View hierarchy, or in the context of a mixed View/Compose screen (not in Fragment).

• DisposeOnDetachedFromWindowOrReleasedFromPool (Default). Similar to DisposeOnDetachedFromWindow, when the Composition is not in a pooling container, such as a RecyclerView. If it is in a pooling container, it will dispose when either the pooling container itself detaches from the window, or when the item is being discarded (i.e. when the pool is full).

  Interop scenario:

  • ComposeView whether it’s the sole element in the View hierarchy, or in the context of a mixed View/Compose screen (not in Fragment);
  • ComposeView as an item in a pooling container such as RecyclerView.

• DisposeOnLifecycleDestroyed. The Composition will be disposed when the provided Lifecycle is destroyed.

  Interop scenario:

  • ComposeView in a Fragment’s View.

• DisposeOnViewTreeLifecycleDestroyed. The Composition will be disposed when the Lifecycle owned by the LifecycleOwner returned by ViewTreeLifecycleOwner.get of the next window the View is attached to is destroyed.

  Interop scenario:

  • ComposeView in a Fragment’s View;
  • ComposeView in a View wherein the Lifecycle is not known yet.

Links

Using Compose in Views

Further Reading

ViewCompositionStrategy Demystified

credit goes to @swayangjit