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The palette contains the UI widgets that you can drag and drop onto the canvas and add to your layout.The pallete categorizes the widgets and shows rendered previews for easier lookup.You can access these enhancements by holding down the control key and clicking on the following items: ADT provides many features to allow you to design and build your application's user interface.Many of these features are in the graphical layout editor, which you can access by opening one of your application's XML layout files in Eclipse.
You can switch between these modes with the pair of tabs at the bottom of each custom XML editor.
For help moving projects, see Migrating to Android Studio.
If you still wish to use the ADT plugin for Eclipse, see Installing Eclipse Plugin.
Each platform version has its own look and feel, which might be the similar to or radically different from another platform version.
The canvas renders the appropriate look and feel for the currently selected platform version.