Java tutorial
//package com.java2s; import android.app.Activity; import android.support.annotation.NonNull; import android.support.annotation.Nullable; import android.support.v4.util.Pair; import android.view.View; import java.util.ArrayList; import java.util.Arrays; import java.util.List; public class Main { public static Pair<View, String>[] createSafeTransitionParticipants(@NonNull Activity activity, boolean includeStatusBar, @Nullable Pair... otherParticipants) { // Avoid system UI glitches as described here: // https://plus.google.com/+AlexLockwood/posts/RPtwZ5nNebb View decor = activity.getWindow().getDecorView(); View statusBar = null; if (includeStatusBar) { statusBar = decor.findViewById(android.R.id.statusBarBackground); } View navBar = decor.findViewById(android.R.id.navigationBarBackground); // Create pair of transition participants. List<Pair> participants = new ArrayList<>(3); addNonNullViewToTransitionParticipants(statusBar, participants); addNonNullViewToTransitionParticipants(navBar, participants); // only add transition participants if there's at least one none-null element if (otherParticipants != null && !(otherParticipants.length == 1 && otherParticipants[0] == null)) { participants.addAll(Arrays.asList(otherParticipants)); } return participants.toArray(new Pair[participants.size()]); } private static void addNonNullViewToTransitionParticipants(View view, List<Pair> participants) { if (view == null) { return; } participants.add(new Pair<>(view, view.getTransitionName())); } }