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POComplete Working Sample of the Gmail Three-Fragment Animation Scenario?
 

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  1. POComplete Working Sample of the Gmail Three-Fragment Animation Scenario?
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    <p>TL;DR: I am looking for a <strong>complete working sample</strong> of what I'll refer to as "the Gmail three-fragment animation" scenario. Specifically, we want to start with two fragments, like this:</p> <p><img src="https://i.stack.imgur.com/OsysI.png" alt="two fragments"></p> <p>Upon some UI event (e.g., tapping on something in Fragment B), we want:</p> <ul> <li>Fragment A to slide off the screen to the left</li> <li>Fragment B to slide to the left edge of the screen and shrink to take up the spot vacated by Fragment A</li> <li>Fragment C to slide in from the right side of the screen and to take up the spot vacated by Fragment B</li> </ul> <p>And, on a BACK button press, we want that set of operations to be reversed.</p> <p>Now, I have seen lots of partial implementations; I'll review four of them below. Beyond being incomplete, they all have their issues.</p> <hr> <p>@Reto Meier contributed <a href="https://stackoverflow.com/a/4819665/115145">this popular answer</a> to the same basic question, indicating that you would use <code>setCustomAnimations()</code> with a <code>FragmentTransaction</code>. For a two-fragment scenario (e.g., you only see Fragment A initially, and want to replace it with a new Fragment B using animated effects), I am in complete agreement. However:</p> <ul> <li>Since you can only specify one "in" and one "out" animation, I can't see how you would handle all the different animations required for the three-fragment scenario</li> <li>The <code>&lt;objectAnimator&gt;</code> in his sample code uses hard-wired positions in pixels, and that would seem to be impractical given varying screen sizes, yet <code>setCustomAnimations()</code> requires animation resources, precluding the possibility of defining these things in Java</li> <li>I am at a loss as to how the object animators for scale tie in with things like <code>android:layout_weight</code> in a <code>LinearLayout</code> for allocating space on a percentage basis</li> <li>I am at a loss as to how Fragment C is handled at the outset (<code>GONE</code>? <code>android:layout_weight</code> of <code>0</code>? pre-animated to a scale of 0? something else?)</li> </ul> <hr> <p>@Roman Nurik points out that <a href="https://stackoverflow.com/a/4936159/115145">you can animate any property</a>, including ones that you define yourself. That can help solve the issue of the hard-wired positions, at the cost of inventing your own custom layout manager subclass. That helps some, but I'm still baffled by the rest of Reto's solution.</p> <hr> <p>The author of <a href="http://pastebin.com/gh2eDkFS" rel="noreferrer">this pastebin entry</a> shows some tantalizing pseudocode, basically saying that all three fragments would reside in the container initially, with Fragment C hidden at the outset via a <code>hide()</code> transaction operation. We then <code>show()</code> C and <code>hide()</code> A when the UI event occurs. However, I don't see how that handles the fact that B changes size. It also relies on the fact that you apparently can add multiple fragments to the same container, and I am not sure whether or not that is reliable behavior over the long term (not to mention it should break <code>findFragmentById()</code>, though I can live with that).</p> <hr> <p>The author of <a href="http://android.amberfog.com/?p=758" rel="noreferrer">this blog post</a> indicates that Gmail is not using <code>setCustomAnimations()</code> at all, but instead directly uses object animators ("you just change left margin of the root view + change width of the right view"). However, this is still a two-fragment solution AFAICT, and the implementation shown once again hard-wires dimensions in pixels.</p> <hr> <p>I will continue plugging away at this, so I may wind up answering this myself someday, but I am really hoping that somebody has worked out the three-fragment solution for this animation scenario and can post the code (or a link thereto). Animations in Android make me want to pull my hair out, and those of you who have seen me know that this is a largely fruitless endeavor.</p>
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    1. COIsn't it something like this posted by Romain Guy? http://www.curious-creature.org/2011/02/22/source-code-for-android-3-0-animation-demo/
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      1. USFernando Gallego
    2. CO@ferdy182: He is not using fragments AFAICT. Visually, it's the right basic effect, and I may be able to use this as another data point for trying to create a fragment-based answer. Thanks!
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    3. COJust a thought: the standard Email app has a similar (although not completely identical) behaviour on my Nexus 7 — which should be open source.
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      1. USChristopher Orr
 

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