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ViewStub

A ViewStub is an invisible, zero-sized View that can be used to lazily inflate layout resources at runtime. When a ViewStub is made visible, or when inflate() is invoked, the layout resource is inflated. The ViewStub then replaces itself in its parent with the inflated View or Views. Therefore, the ViewStub exists in the view hierarchy until setVisibility(int) or inflate() is invoked. The inflated View is added to the ViewStub’s parent with the ViewStub’s layout parameters. Similarly, you can define/override the inflate View’s id by using the ViewStub’s inflatedId property. For instance:

<ViewStub 
  android:id="@+id/stub"
  android:inflatedId="@+id/subTree"
  android:layout="@layout/mySubTree"
  android:layout_width="120dip"
  android:layout_height="40dip" />

The ViewStub thus defined can be found using the id “stub.” After inflation of the layout resource “mySubTree,” the ViewStub is removed from its parent. The View created by inflating the layout resource “mySubTree” can be found using the id “subTree,” specified by the inflatedId property. The inflated View is finally assigned a width of 120dip and a height of 40dip. The preferred way to perform the inflation of the layout resource is the following:

ViewStub stub = findViewById(R.id.stub); View inflated = stub.inflate();

When inflate() is invoked, the ViewStub is replaced by the inflated View and the inflated View is returned. This lets applications get a reference to the inflated View without executing an extra findViewById().

Links

https://developer.android.com/reference/android/view/ViewStub
https://stackoverflow.com/questions/11577777/how-to-use-view-stub-in-android
https://proandroiddev.com/viewstub-on-demand-inflate-view-or-inflate-lazily-layout-resource-e56b8c39398b

credit goes to @swayangjit