View.RequireViewById Method

Definition

Namespace:: Android.Views

Assembly:: Mono.Android.dll

Important

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Overloads

Name	Description
RequireViewById(Int32)	Finds the first descendant view with the given ID, the view itself if the ID matches `#getId()`, or throws an IllegalArgumentException if the ID is invalid or there is no matching view in the hierarchy.
RequireViewById<T>(Int32)	Finds the view with the specified ID as the requested type.

RequireViewById(Int32)

Finds the first descendant view with the given ID, the view itself if the ID matches #getId(), or throws an IllegalArgumentException if the ID is invalid or there is no matching view in the hierarchy.

[Android.Runtime.Register("requireViewById", "(I)Landroid/view/View;", "", ApiSince=28)]
[Java.Interop.JavaTypeParameters(new System.String[] { "T extends android.view.View" })]
public Java.Lang.Object RequireViewById(int id);

[<Android.Runtime.Register("requireViewById", "(I)Landroid/view/View;", "", ApiSince=28)>]
[<Java.Interop.JavaTypeParameters(new System.String[] { "T extends android.view.View" })>]
member this.RequireViewById : int -> Java.Lang.Object

Parameters

id: Int32

the ID to search for

Returns

Object

a view with given ID

Attributes: RegisterAttribute JavaTypeParametersAttribute

Remarks

<strong>Note:</strong> In most cases -- depending on compiler support -- the resulting view is automatically cast to the target class type. If the target class type is unconstrained, an explicit cast may be necessary.

Java documentation for android.view.View.requireViewById(int).

Portions of this page are modifications based on work created and shared by the Android Open Source Project and used according to terms described in the Creative Commons 2.5 Attribution License.

Applies to

RequireViewById<T>(Int32)

Finds the view with the specified ID as the requested type.

public T RequireViewById<T>(int id) where T : Android.Views.View;

member this.RequireViewById : int -> 'T (requires 'T :> Android.Views.View)

Type Parameters

T

The expected view type.

Parameters

id: Int32

The resource identifier of the required view.

Returns

The matching view as T.

Remarks

This managed convenience overload requires a matching view. It throws IllegalArgumentException when the ID is invalid or no matching view exists, and InvalidCastException when the matching view is incompatible with T.

Applies to