12.0.0 - Many bug fixes! - Visual Layout Editor: - New RelativeLayout drop support with guideline suggestions for attachments and cycle prevention. - Resize support in most layouts. In LinearLayout, sizes are mapped to weights. Guideline snapping to wrap_content and match_parent. - Previews of drawables and colors in the resource chooser dialogs. - Improved error messages and links for rendering errors, including detection of misspellings of class names. - Build system: Delay post compiler phase until actual export or debug to speed up interactive file saves. (This is off by default but can be enabled in the ADT options panel.) 11.0.0 - Visual Refactoring: - The new "Extract Style" refactoring pulls out style constants and defines them as style rules instead. - The new "Wrap in Container" refactoring surrounds the selected views with a new layout, and transfers namespace and layout parameters to the new parent - The new "Change Widget Type" refactoring changes the type of the selected views to a new type. (Also, a new selection context menu in the visual layout editor makes it easy to select siblings as well as views anywhere in the layout that have the same type). - The new "Change Layout" refactoring changes layouts from one type to another, and can also flatten a layout hierarchy. - The "Extract as Include" refactoring now finds identical fragments in other layouts and offers to combine all into a single include. - There is a new Refactoring Quick Assistant which can be invoked from the XML editor (with Ctrl-1) to apply any of the above refactorings (and Extract String) to the current selection. - Visual Layout Editor: - Improved "rendering fidelity": The layout preview has been improved and should more closely match the rendering on actual devices. - The visual editor now previews ListViews at designtime. By default, a two-line list item is shown, but with a context menu you can pick any arbitrary layout to be used for the list items, and you can also pick the header and footer layouts. - The palette now supports "configurations" where a single view is presented in various different configurations. For example, there is a whole "Textfields" palette category where the EditText view can be dragged in as a password field, an e-mail field, a phone field, and so on. Similarly, TextViews are offered preconfigured with large, normal and small theme sizes, and LinearLayouts are offered both in horizontal and vertical configurations. - The palette supports custom views, picking up any custom implementations of the View class in your project source folders or in included libraries, and these can be dragged into layouts. - Fragments support: Fragments are available in the palette, and in the tool you can choose which layout to show rendered for a given fragment tag. Go to declaration works for fragment classes. - The layout editor automatically applies a "zoom to fit" for newly opened files as well as on device size and orientation changes to ensure that large layouts are always fully visible unless you manually zoom in. - You can drop an "include" tag from the palette, which will pop up a layout chooser, and the chosen layout is added as an include. Similarly, dropping images or image buttons will pop up image resource choosers to initialize the new image with. - The configuration chooser now applies the "Render Target" and "Locale" settings project wide, making it trivial to check the layouts for different languages or render targets without having to configure these individually for each layout. - The layout editor is smarter about picking a default theme to render a layout with, consulting factors like theme registrations in the manifest, the SDK version, etc. - The layout editor is also smarter about picking a default configuration to render a layout with, defaulting to the currently visible configuration in the previous file. It also considers the SDK target to determine whether to default to a tablet or phone screen size. - Basic focus support: The first text field dropped in a layout is assigned focus, and there are "Request Focus" and "Clear Focus" context menu items on text fields to change the focus. - XML editors: - Code completion has been significantly improved. It now works within