---
title: "ViewTreeHostDefaultKey"
description: "An Android-specific [HostDefaultKey] that identifies values stored within the [View] hierarchy
using Resource ID tags.

This key is specifically designed for use with `ViewTreeHostDefaultProvider`. It allows the
runtime to resolve dependencies by traversing upward through the view tree—including across
disjoint parents like Dialogs and Popups—to find a value associated with the provided [tagKey]."
type: "interface"
---

<div class='type'>Interface</div>


<a id='references'></a>

<div class='sourceset sourceset-android'>Android</div>



```kotlin
public interface ViewTreeHostDefaultKey<T> : HostDefaultKey<T>
```


An Android-specific `HostDefaultKey` that identifies values stored within the `View` hierarchy
using Resource ID tags.

This key is specifically designed for use with `ViewTreeHostDefaultProvider`. It allows the
runtime to resolve dependencies by traversing upward through the view tree—including across
disjoint parents like Dialogs and Popups—to find a value associated with the provided `tagKey`.

#### Parameters

| | |
| --- | --- |
| T | The type of the value associated with this key. |
| tagKey | The Android Resource ID used as the tag key in `android.view.View.getTag`. |