[TIMOB-7188] Android: Media module methods takeScreenshot and previewImage not implemented in 1.8.0.1

   Titanium.UI.setBackgroundColor('#000');
   var win = Titanium.UI.createWindow({  
       title:'Test',
       backgroundColor:'#000',
   	exitOnClose: true
   });
   
   win.add(Ti.UI.createLabel({
   	backgroundColor: "blue",
   	color: "yellow",
   	text: "Hello There",
   	textAlign: "center",
   	left: "10dp", right: "10dp", top: "5dp", height: "40dp"
   }));
   
   win.add(Ti.UI.createImageView({
   	height: "43dp", width: "46dp",
   	image: "KS_nav_ui.png", top: "100dp"
   }));
   
   var btn;
   win.add(btn = Ti.UI.createButton({
   	title: "Take screenshot",
   	bottom: "5dp", height: "40dp",
   	left: "50dp", right: "50dp"
   }));
   
   function previewCallback(args) {
   	Ti.API.info("previewImage success");
   }
   
   function previewError(e) {
   	alert("previewImage failure: " + e.message);
   	Ti.API.error(e.message);
   }
   
   function screenshotCallback(image) {
   	if (!image) {
   		alert("Eeks, takeScreenshot didn't return anything.");
   		return;
   	} else {
   		var blob = image.media;
   		if (!blob) {
   			alert("Eeks, there was no useful 'media' member of the passed result dictionary.");
   			return;
   		}
   		if (Ti.Platform.osname === "android") {
   			Ti.API.info("Got an image blob back from takeScreenshot.  Gonna store it and preview it.");
   			var tempdir = Ti.Filesystem.tempDirectory;
   			var file = Ti.Filesystem.getFile(Ti.Filesystem.externalStorageDirectory, "temp.png");
   			if (file.exists()) {
   				file.deleteFile();
   			}
   			file.write(blob);
   			Ti.Media.previewImage({
   				success: previewCallback,
   				error: previewError,
   				image: file.read()
   			});
   		} else {
   			alert("Call to takeScreenshot successful.  Got a blob back.");
   		}
   	}
   }
   
   btn.addEventListener("click", function() {
   	Ti.Media.takeScreenshot(screenshotCallback);
   });
   
   win.open();