Activity.RequireViewById Method

Definition

Namespace:: Android.App

Assembly:: Mono.Android.dll

Important

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Overloads

Name	Description
RequireViewById(Int32)	Finds a view that was identified by the `android:id` XML attribute that was processed in `#onCreate`, or throws an IllegalArgumentException if the ID is invalid, or there is no matching view in the hierarchy.
RequireViewById<T>(Int32)	Performs a typed view lookup and throws if the result is null.

RequireViewById(Int32)

Finds a view that was identified by the android:id XML attribute that was processed in #onCreate, 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

Finds a view that was identified by the android:id XML attribute that was processed in onCreate(Bundle), or throws an IllegalArgumentException if the ID is invalid, or there is no matching view in the hierarchy. Note: 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.

Applies to

RequireViewById<T>(Int32)

Performs a typed view lookup and throws if the result is null.

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 view type used by the typed lookup.

Parameters

id: Int32

The resource ID used to look up the required view.

Returns

The non-null view obtained by the typed lookup.

Remarks

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