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android Responsive design VS CSS Resposnive Design

I wanna make android application with responsive design concept.
After searching and searching, I found that there are two ways for doing that :
By adding new xml files under res folder like layout-sw800dp/activity1.xml and values-sw800dp/activity1.xml , and android detects the screen size during run time and loads the appropriate xml file.
By making CSS responsive design and loading it in android but I don't know how to deal with buttons' actions in this way.
I ask about the best way for doing responsive design in android and what are the advantage and disadvantages for each way and how to deal with the buttons in the second way ?
Thanks in advance

I agree with #schabluk. Android provides RelativeLayout which is similar to responsive design in html.
Your first way of creating layout is not appropriate as there are thousands of android mobiles.
Use android's Webview for handling button events. Webview is a view for embedding html content in android applications.

You should follow "Best Practices for User Experience & UI". See Designing for Multiple Screens tutorial.

Android layout translations

are there design conventions for layouts on larger layouts? I feel like this is a question few have asked.
A lot of android layouts don't look good on larger screens, or the user experience doesn't translate so seamlessly.
A critique of android apps is that they just stretch on large screens, but don't have any design considerations for them.
Is there a resource that details how a user might want to make their layout-large xml file, if their default layout xml file includes a listview, for instance. On the mobile experience, a listview with just text will be fine, where on the larger screen experience, the listview by itself doesn't look too good.
I would like to add extra layout files, but I don't have any reference on what they should look like, or even in the planning design phases of an app, I don't have any reference on how it ought to be designed so that other screen sizes can be incorporated.
Mainly looking for a resource that addresses these issues. Like maybe a blog post that goes into detail about this. Google's tablet design guidelines were a helpful start too.
Insight appreciated

Perhaps these resources will help you out. I would make the general statement that probably the most common technique for adapting layouts from handset to tablet is making tablet layouts multi-pane. You mentioned that you already perused through the Google design guide, but I figured I'd highlight the one page that talks specifically about this:
Android Design: Multi-Pane Layouts
The general concept is that information you would have presented on multiple screens on the handset (e.g. the list of items, followed by the view to display the selection) can be brought together on the same screen on a tablet (so the list now sits side-by-side with the view of the current selection). You mentioned already how the resource framework assists in selecting the proper layout; on the code side Fragments are intended to assist with modularizing the code that goes along with the view as well.
Another resource that may be of use is from Googler Kirill Grouchnikov. He has a series of blog posts dealing with Google Play as a case study and how conceptually the UI was broken up to work between the handset and tablet:
Responsive Mobile Design
Hope that Helps!

UI design guidelines for Android Tablets

Are there any UI design guidelines for the upcoming Android tablets? Looks like the Archos 7 will be available sometime this month. My question is not about supporting the screen size but more about providing a more appealing UI interface for a bigger screen device.
Thanks

It is not really UI Design Guidelines, but you can create your custom layout extend ViewGroup and be able to react to extra big resolution of the screen by putting extra components on screen and alter the layout significantly, well beyond what's possible using the build-in multi resolution XML layout mechanism.

A great starting point would be the official Android Design Guidelines.
In particular, the sections on Multi-pane Layouts and Devices and Displays might be of interest to you.

When understanding Android app development, one of the most significant topics to comprehend is how to make delightful mobile interfaces and interactions. This indicates understanding the patterns within the Android universe, common style guidelines, patterns, etc.
The official Android docs have an outstanding set of design resources. This section will emphasize a few key design guidelines and link to the appropriate guides. You can also check out these Android design tips for a quick overview.
Screen Size and Orientation
System Bar
Back Button
Action Bar
Widgets
Notifications
Settings
UI Elements
Fonts
Split View and Multi-Pane UI
Embedded Multimedia
Clipboard
Design Patterns

Scrolling list in Android home screen widget

I am trying to teach myself the basics of Android dev. At the moment I am experimenting with home screen widgets. I would like to create a simple widget that lists all my bookmarks. Somewhere in my googling I read that ListView is not usable in a widget. What's the best way to display a scrolling list in a widget? An example would be fantastic, but otherwise point me in the right general direction and I can research further.
Thanks in advance,
Dany.

ListViews are supported in Custom Launchers that support the scrollable-widgets extension or in the Launchers since Android 3.0 (Honeycomb). Take the Android Agenda Widget for example, this supports scrolling in Custom Launchers, or the GMail-widget on Honeycomb.
Scrolling widgets in Custom Launchers is described here:
http://www.geekrono.com/2010/08/android-scrollable-widgets.html
Scrolling widgets in Honeycomb and up is described here:
http://developer.android.com/guide/topics/appwidgets/index.html#collections
You can finnd the sources for good working example except for Honeycomb at http://code.google.com/p/scrollablecontacts/

I've only seen a huge list widget on phones with HTC Sense - example. HTC Sense has a widget like that for Stocks, Twitter, etc. I don't think it's a good idea to develop huge widgets like that, because they take up too much space and some phones are limited to 3 screens (screens that you can put your app shortcuts, widgets and etc).
This is a good article on Widget UI Patterns:
Widget Design Guidelines
Seesmic for Android has a 'list' widget with latest tweets:Seesmic Blog
Widget Screen
There's also an article on UI Patterns, based on the new Twitter app, hope that helps you - Link and a video (Android UI design patterns).
Re: user controls (like in .NET), Android Views and in your case 'ListView' is what you might use for your app. You also mentioned .NET (Visual Studio), you might be interested in MOTODEV Studio. It's basically a better version of Eclipse (with Android SDK) that has common code snippets and other cool stuff.

Android Application looks like iphone

I came across this app and I wonder how was it developed on android (Cause it looks so much like an iphone app), see this screenshot.
Anyone have any idea how to accomplish that type of look on Android?

That's just a matter of styling after all. In general, I would consider it to be discouraged to make your Android app look like an iPhone app. Every platform has its own UX standards, and Android's standards are different from iPhone's. That quite obviously also reflects in the user interface.
Anyhow, you may want to read this article about Android themes and styles. It should get you going with defining own widget styles and stateful drawables to implement custom buttons.

This app obviously uses customized ListViews, ButtonView on the bottom of the screen.
Theses are pretty much standard and common in android apps.

Here is how to create custom components:
https://developer.android.com/guide/topics/ui/custom-components.html