[TIMOB-12734] Android: Added ability to change layout dynamically via "layout" property like iOS.

[jquick-axway]

JIRA: https://jira.appcelerator.org/browse/TIMOB-12734

Test:

1. Build and run the below code on an Android device.
2. Tap the "Vertical" button.
3. Verify that "View 1" is above "View 2".
4. Tap the "Horizontal" button.
5. Verify that "View 1" is to the left of "View 2".
6. Tap the "Composite" button.
7. Verify that "View 1" and "View 2" are at the center of the screen and "View 2" is on top.

var window = Ti.UI.createWindow();

var mainContainer = Ti.UI.createView({ top: "2%" });
mainContainer.add(Ti.UI.createLabel(
{
	text: "View 1",
	textAlign: Ti.UI.TEXT_ALIGNMENT_CENTER,
	verticalAlign: Ti.UI.TEXT_VERTICAL_ALIGNMENT_TOP,
	color: "white",
	backgroundColor: "#0000FF",
	borderWidth: "2dp",
	borderColor: "#000088",
	width: "50%",
	height: "50%",
}));
mainContainer.add(Ti.UI.createLabel(
{
	text: "View 2",
	textAlign: Ti.UI.TEXT_ALIGNMENT_CENTER,
	verticalAlign: Ti.UI.TEXT_VERTICAL_ALIGNMENT_TOP,
	color: "white",
	backgroundColor: "#00BB00",
	borderWidth: "2dp",
	borderColor: "#004400",
	width: "25%",
	height: "25%",
}));
window.add(mainContainer);

var buttonContainer = Ti.UI.createView(
{
	layout: "horizontal",
	bottom: "1%",
	width: Ti.UI.SIZE,
	height: Ti.UI.SIZE,
});
var verticalButton = Ti.UI.createButton({ title: "Vertical" });
verticalButton.addEventListener("click", function(e) {
	mainContainer.layout = "vertical";
});
buttonContainer.add(verticalButton);
var horizontalButton = Ti.UI.createButton({ title: "Horizontal", left: "5%" });
horizontalButton.addEventListener("click", function(e) {
	mainContainer.layout = "horizontal";
});
buttonContainer.add(horizontalButton);
var compositeButton = Ti.UI.createButton({ title: "Composite", left: "5%" });
compositeButton.addEventListener("click", function(e) {
	mainContainer.layout = "composite";
});
buttonContainer.add(compositeButton);
window.add(buttonContainer);

window.open();

[garymathews]

CR: PASS
👍

[lokeshchdhry]

FR Passed.

Changing layoutproperty dynamically works as expected.

Studio Ver: 4.9.1.201707200100
SDK Ver: 7.0.0 local build
OS Ver: 10.12.3
Xcode Ver: Xcode 8.3.3
Appc NPM: 4.2.9
Appc CLI: 6.2.3
Ti CLI Ver: 5.0.14
Alloy Ver: 1.9.13
Node Ver: 6.10.1
Java Ver: 1.8.0_101
Devices: ⇨ google Pixel --- Android 7.1.1
⇨ google Nexus 5 --- Android 6.0.1
Android Emulator: Android 4.4.4