Navigating a mobile application should be an intuitive and visually pleasing experience. A critical component in achieving this is the Android BottomNavigationView, which provides persistent access to top-level destinations in an app. However, simply using the default styling can lead to a bland or inconsistent user interface. One of the most impactful ways to enhance both usability and aesthetic appeal is by effectively customizing the Selected tab’s color in Bottom Navigation View. This seemingly small detail plays a significant role in guiding users, indicating their current position, and reinforcing your brand’s visual identity. Understanding how to precisely control this active state color is essential for any developer or designer aiming for a polished and professional app.
Understanding the Bottom Navigation View’s Role in UX
The BottomNavigationView serves as an anchor for primary navigation, keeping key sections of your application readily accessible. Its placement at the bottom of the screen makes it easily reachable by a user’s thumb, enhancing one-handed usability. When a user taps a tab, it activates a new screen, and visually signifying this change is paramount. A distinct selected tab’s color immediately communicates “you are here,” reducing cognitive load and improving overall navigation clarity. Without clear visual feedback, users might feel lost or unsure if their tap registered, leading to frustration.
Effective use of the BottomNavigationView aligns with Material Design principles, which emphasize clarity, consistency, and intuitive interactions. Google’s Material Design guidelines provide a robust framework for creating beautiful and functional interfaces, and color plays a central role in conveying meaning and hierarchy. By thoughtfully applying color to the selected state, developers can reinforce the active tab, draw attention to it, and subtly guide the user’s focus. This attention to detail contributes significantly to a positive user experience, making the app feel more responsive and thoughtfully designed.
The Psychology of Color in UI Design
Color is a powerful psychological tool in user interface design. It can evoke emotions, convey meaning, and direct attention. For instance, a vibrant, contrasting color for the selected tab can create a sense of importance and activity, whereas a muted color might suggest a less critical state. When choosing the selected tab’s color, consider your brand’s palette and the overall mood of your application. Consistent color usage across various UI elements helps establish a cohesive visual language, making the app feel more unified and professional. Users often associate specific colors with actions or states, so leveraging these associations can enhance the intuitiveness of your navigation.
Mastering Selected Tab Color Customization
Customizing the Selected tab’s color in Bottom Navigation View involves targeting specific attributes within your Android project’s XML resources. The primary way to achieve this is by defining a ColorStateList, which allows you to specify different colors for various states of a UI element, such as selected, pressed, or disabled. This approach provides granular control and ensures your app’s navigation looks polished and reactive to user input. Developers commonly adjust both the icon tint and the text color of the items within the navigation view to achieve a harmonious and distinct active state.
For developers looking to precisely control the visual feedback of their navigation, the app:itemIconTint and app:itemTextColor attributes are key. These attributes accept a reference to a ColorStateList XML file, not just a single color. This powerful mechanism means you don’t just pick one color; you define a set of colors that the system applies based on the item’s current state. For example, you can have a grey icon when unselected and a brand-specific blue when selected, enhancing the clarity of the active tab. It’s crucial to understand that without a ColorStateList, the system might default to theme colors or apply a single, static color, which rarely provides the desired dynamic effect.
Using XML ColorStateList for Dynamic Tints
The most effective method for controlling the selected tab’s color is through an XML ColorStateList. This file, typically placed in your res/color directory, defines a list of color items, each associated with specific UI states. For the BottomNavigationView, you’ll primarily be concerned with the android:state_checked="true" for the selected state and the default state for unselected items. This separation allows for clear visual differentiation, which is a cornerstone of good UI design.
For instance, a simple ColorStateList might define a primary color for the checked state and a lighter grey for the default state. This file is then referenced in your BottomNavigationView layout using attributes like app:itemIconTint="@color/bottom_nav_item_colors" and app:itemTextColor="@color/bottom_nav_item_colors". This centralized approach makes it easy to manage and modify your app’s theme and visual consistency. For more in-depth guidance on creating these selectors, the Android Developers documentation on ColorStateList is an invaluable resource.
Adjusting Icon and Text Colors Independently
While a single ColorStateList can be used for both icons and text, you also have the flexibility to define separate ColorStateList resources for each. This allows for more nuanced design. For example, you might want the icon to turn your brand’s accent color when selected, while the text simply becomes a bolder version of its unselected state. This level of customization ensures that every visual element contributes to a cohesive and informative user interface. Remember that an effective Selected tab’s color in Bottom Navigation View isn’t just about brightness, but about how it harmonizes with the entire design.
Best Practices for Bottom Navigation View Styling
When styling your BottomNavigationView, adhering to best practices ensures not only aesthetic appeal but also enhanced usability. A key principle is maintaining visual consistency. The selected tab’s color should ideally complement your app’s overall color scheme, often drawing from your primary or secondary brand colors. Overly bright or clashing colors can distract users and detract from the app’s professional feel. According to a study by Nielsen Norman Group on Bottom Navigation, consistent behavior and clear visual feedback are crucial for user satisfaction.
Another best practice is to ensure sufficient contrast between the selected tab’s color and the unselected tabs, as well as between the text/icon and its background. This is not just an aesthetic choice but a crucial accessibility consideration. Users with visual impairments rely heavily on strong color contrast to differentiate elements. Testing your chosen colors on various devices and screen settings can help identify potential readability issues early on. Furthermore, consider the state of the tab when it’ Question & Answer :
I’m adding a BottomNavigationView to a project, and I would like to have a different text (and icon tint) color for the selected tab (to achieve greying out non-selected tabs effect). Using a different color with android:state_selected="true" in a color selector resource file doesn’t seem to work. I also tried having additional item entries with android:state_focused="true" or android:state_enabled="true", no effect unfortunately. Also tried setting the state_selected attribute to false (explicitly) for the default (non-selected) color, with no luck.
Here is how I add the view to my layout:
<android.support.design.widget.BottomNavigationView android:id="@+id/bottom_navigation" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_alignParentBottom="true" app:itemBackground="@color/silver" app:itemIconTint="@color/bnv_tab_item_foreground" app:itemTextColor="@color/bnv_tab_item_foreground" app:menu="@menu/bottom_nav_bar_menu" />
Here is my color selector (bnv_tab_item_foreground.xml):
<?xml version="1.0" encoding="utf-8"?> <selector xmlns:android="http://schemas.android.com/apk/res/android"> <item android:color="@android:color/darker_gray" /> <item android:state_selected="true" android:color="@android:color/holo_blue_dark" /> </selector>
And my menu resource (bottom_nav_bar_menu.xml):
<?xml version="1.0" encoding="utf-8"?> <menu xmlns:android="http://schemas.android.com/apk/res/android"> <item android:id="@+id/action_home" android:icon="@drawable/ic_local_taxi_black_24dp" android:title="@string/home" /> <item android:id="@+id/action_rides" android:icon="@drawable/ic_local_airport_black_24dp" android:title="@string/rides"/> <item android:id="@+id/action_cafes" android:icon="@drawable/ic_local_cafe_black_24dp" android:title="@string/cafes"/> <item android:id="@+id/action_hotels" android:icon="@drawable/ic_local_hotel_black_24dp" android:title="@string/hotels"/> </menu>
I would appreciate any help.
While making a selector, always keep the default state at the end, otherwise only default state would be used. You need to reorder the items in your selector as:
<?xml version="1.0" encoding="utf-8"?> <selector xmlns:android="http://schemas.android.com/apk/res/android"> <item android:state_checked="true" android:color="@android:color/holo_blue_dark" /> <item android:color="@android:color/darker_gray" /> </selector>
And the state to be used with BottomNavigationBar is state_checked not state_selected.
