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

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Uploaded my proposal at github
(Is working with all android versions though view hardware acceleration is strongly recommended for this kind of animations. For non hardware accelerated devices a bitmap caching implementation should fit better)

Demo video with the animation is Here (Slow frame rate cause of the screen cast. Actual performance is very fast)

Usage:

layout = new ThreeLayout(this, 3);
layout.setAnimationDuration(1000);
setContentView(layout);
layout.getLeftView();   //<---inflate FragmentA here
layout.getMiddleView(); //<---inflate FragmentB here
layout.getRightView();  //<---inflate FragmentC here

//Left Animation set
layout.startLeftAnimation();

//Right Animation set
layout.startRightAnimation();

//You can even set interpolators

Explaination:

Created a new custom RelativeLayout(ThreeLayout) and 2 custom Animations(MyScalAnimation, MyTranslateAnimation)

ThreeLayout gets the weight of the left pane as param ,assuming the other visible view has weight=1.

So new ThreeLayout(context,3) creates a new view with 3 children and the left pane with have 1/3 of the total screen. The other view occupies the all available space.

It calculates width at runtime,a safer implementation is that the dimentions are be calculated first time in draw(). instead of in post()

Scale and Translate animations actually resize and move the view and not pseudo-[scale,move]. Notice that fillAfter(true) is not used anywhere.

View2 is right_of View1

and

View3 is right_of View2

Having set these rules RelativeLayout takes care of everything else. Animations alter the margins (on move) and [width,height] on scale

To access each child (so that you can inflate it with your Fragment you can call 

public FrameLayout getLeftLayout() {}

public FrameLayout getMiddleLayout() {}

public FrameLayout getRightLayout() {}

Below are demonstrated the 2 animations

Stage1

—IN Screen———-!—–OUT—-

[View1][_____View2_____][_____View3_____]

Stage2

–OUT-!——–IN Screen——

[View1][View2][_____View3_____]

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