android - Setting selected TAB with a small triangle below it

Question

I want my tabs to show like in the image with small triangle below it.Is this possible ?If yes, then help me with some codes or documentation.

Answer 1

I think, the following approach is the simplest one. You just need to setup the following drawable (actually, it's Android's default drawable for tabs) as a background of the tabs:

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <!-- Non focused states -->
    <item android:state_focused="false" android:state_selected="false" android:state_pressed="false" android:drawable="@drawable/tab_unselected" />
    <item android:state_focused="false" android:state_selected="true" android:state_pressed="false" android:drawable="@drawable/tab_selected" />
    <!-- Focused states -->
    <item android:state_focused="true" android:state_selected="false" android:state_pressed="false" android:drawable="@drawable/tab_focus" />
    <item android:state_focused="true" android:state_selected="true" android:state_pressed="false" android:drawable="@drawable/tab_focus" />
    <!-- Pressed -->
    <item android:state_pressed="true" android:drawable="@drawable/tab_press" />
</selector>

where tab_press, tab_focus and tab_selected drawables would be png's (I'd prefer 9-patches) with down-arrow and transparent region near it. tab_unselected drawable wouldn't have this arrow, but still would have same transparent region. The only thing left to do is to specify negative bottom margin for your TabWidget. Its value is determined by the height of the arrow (do not forget to use density independent units):