Android button bar toggle

I am looking for a UI view that imitates the functionality of the Google Maps directions screen UI control where it allows the user to pick the type of directions allowed, either Car, Transit or Walking.

Like this --> http://snapplr.com/50rh

The widget is essentially three buttons laid out horizontally with rounded corners only on the left of the first and right of the thirdbutton.

I can't see a standard way to do开发者_StackOverflow社区 this, although it seems like it would be a common widget. Is there some other standard way of presenting a multi-choice grouping in a horizontal layout as a "single" layout object.

I am not aware of a button bar widget in the Android SDK. You would create one with ImageButtons in a LinearLayout, with custom backgrounds for all (to give the gloss-black look, to handle the varied sets of corners, and to handle the selected vs. not imagery). You would then need to add the toggling smarts, such that pushing one makes it selected and makes the others in the layout not selected.

If you wish to stick to simpler existing widgets, Spinner, RadioButton, or ToggleButton would be the most likely candidates.

I don't think there is a built-in way to do it. I can think of two ways to accomplish it. The first would be to create a custom style for the TabWidget. The second would be to create your own custom widget. Making a TabWidget style might be more flexible because you could easily come back and add or remove tabs and it would update accordingly. Making your own custom widget would give you much more control over how the widget looks and acts. So really you need to see what would be the best fit for what you're trying to do.

Best button bar I've found: http://androidworkz.com/2011/02/04/custom-menu-bar-tabs-how-to-hook-the-menu-button-to-showhide-a-custom-tab-bar/

It's thought to be used as a replacement for the menu, but I believe it's also great for a custom button bar. I'm actually gonna integrate it in my app straight away :-)

Kudos for androidworkz, the original author.

I think the power control widget does what you want. Looking at the source for the widget, it uses a combination of LinearLayouts & ImageViews to achieve the layout.

Layout file: https://android.googlesource.com/platform/packages/apps/Settings/+/froyo-release/res/layout/widget.xml

Source code: https://android.googlesource.com/platform/packages/apps/Settings/+/froyo-release/src/com/android/settings/widget/SettingsAppWidgetProvider.java