Java tutorial
//package com.java2s; import android.support.v4.util.Pair; import android.view.View; import java.util.List; public class Main { private static void addNonNullViewToTransitionParticipants(View view, List<Pair> participants) { if (view == null) { return; } participants.add(new Pair<>(view, view.getTransitionName())); } }