IRMobydick

public class ImageFlipper{
    private static final int START_ANGLE = 90;
    private static final int END_ANGLE = 270;
    
    private int animationDuration = 800;
    private ObjectAnimator flipObjectAnimator;

    public ImageFlipper(final View targetView, final int[] drawableResources){
        ((ImageView)targetView).setImageResource(drawableResources[0]);
        flipObjectAnimator = ObjectAnimator.ofFloat(targetView, "rotationY", START_ANGLE, END_ANGLE);

IRMobydick

public class MyFragment {
        boolean loaded;
        private void maybeLoad() {
            if (!loaded && getUserVisibleHint()) {
                loaded = true;
                loadMyData();
            }
        }

        @Override

IRMobydick

/*
 * Copyright 2014 Chris Banes
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software