![]() ![]() Over the years we’ve surfaced more APIs that allow you to style the tab bar more, but the native platforms kept limiting us. This works great and maps to the native equivalents on all platforms supported, but that is just the thing: it uses the native look and feel. The way to implement a tab bar in Xamarin.Forms is by using a TabbedPage. In this blogpost we’ll learn what it’s all about. With the TabView you have full control over the look-and-feel of the tab bar. To overcome this, we’ve added the TabView to the Xamarin Community Toolkit. The result of these styles is that the text color is purple when tab is selected and white otherwise.īrowse the Styling the ActionBar official guide for a basic overview.One of the hardest parts of apps to customize is the tab bar. To do this, we need to define a color selector in res/color/selector_tab_text.xml: Īnd then we can apply this color selector to the tab text color within res/values/styles.xml: This allows the tab to be one color when selected and another color when unselected. We may also want to customize the tab text color based on the selected state of the tab. With these steps in place, we now have fully customized tabs with this result: To draw the indicator, we created a layer-list for a rectangle shape with a 2dp stroke around the exterior, then offset the rectangle so that the top, left and right sides are outside the bounds of the view, so we will only see the bottom line.įinally, we need to set the background for the tabs to the tab_bar_background drawable in res/values-v14/styles.xml: The indicator under the active tab comes from the background drawable. In res/drawable/tab_bar_background.xml we can add: Įach state applies a different layer-list representing the different tab states. This will be a selector drawable, which has different layer-lists applied depending on whether the tab is selected or not. If you want to customize the indicator, you need to alter this style.įirst, we need to create the tab_bar_background drawable which defines the tab drawables for each state. The tab is the area that includes the text, its background, and the little indicator colored bar under the text. To customize the tabs including bottom indicators, we will be overriding actionBarTabStyle which determines the style of the tabs themselves. The result of these styles is this with the actionBarTabBarStyle set orange, the actionBarTabStyle set green and the actionBarTabTextStyle set purple (selected) or white: flContainer, this, "First", FirstFragment. setTabListener ( new FragmentTabListener ( R. putString ( "someTitle", someTitle ) // Pass bundle into the tab listener constructor Tab tab1 = actionBar. Fortunately, the FragmentTabListener can accept an optional Bundle argument which will be passed into the fragment automatically during creation: // Construct the bundle passing in arguments Bundle firstBundle = new Bundle () args. In certain cases we need to be able to pass arguments into the tab fragments during their construction. This will return the fragment instance embedded for that tab. You have assigned the tag FIRST_TAB_TAG to that fragment during construction and you can access the fragment for this tab later using findFragmentByTag: FirstFragment fragmentFirst = getSupportFragmentManager (). flContainer, this, FIRST_TAB_TAG, FirstFragment. For example, if you created the following tab: private final String FIRST_TAB_TAG = "first" Tab tab1 = actionBar. If you need to reference a fragment instance from within the activity, you can refer to the fragment by it's "tag". With this approach you can have easy tab navigation switching quickly between fragments. Once you have created the FragmentTabListener from this snippet within your app, setup the ActionBar and define which tabs you would like to display and attach listeners for each tab: public class MainActivity extends FragmentActivity A good default implementation is just adding this to FragmentTabListener.java To setup tabs using ActionBar and fragments that are not gingerbread compatible, you need to add a TabListener implementation to your application which defines the behavior of a tab when activated. ![]() Tabs should now be built using the TabLayout. ![]() Note: As of Android 5.0, ActionBar Tabs is now officially deprecated. Thankfully, both the support approaches are more or less identical in code with a few class name tweaks. Google has also released a support AppCompatActivity class which can be used for compatible tabs. Note: Standard ActionBar tabs are not supported in Gingerbread, so many people use ActionBarSherlock when Gingerbread must be supported. There are several ways to setup tabs with fragments. ![]()
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