Your app can handle the behavior of the Back button and Search button, if you want a behavior that differs from the system default. Your app can provide menu items for the overflow menu.
Favorites (first-generation and second-generation Kindle Fire tablets only). In Fire OS 4 and earlier, the soft key bar has the following buttons: Make sure that the custom behavior is consistent with user expectations for the Back public void onBackPressed () Soft Key Bar Buttons (Fire OS 4 and earlier) However, you can modify the behavior of the Back button by overriding the Activity.onBackPressed() method in your Activity. The default behavior of the Back button is sufficient for most apps, because it returns the user to the previous activity. When querying DisplayMetrics to calculate the appropriate size for the user interface and graphics, you need to adjust the return values to compensate for any toolbars. The return values from are the screen resolution, not the resolution of the region unobscured by toolbars. For information about screen layout, see Screen Layout and Resolution. 
Therefore, make sure that the user interface for your app is not obscured by the navigation bar or status bar. The navigation bar is always accessible to the user because Fire tablets do not have hardware-based keys for system functions. Soft Key Bar Buttons (Fire OS 4 and earlier).This customization is deprecated as of Fire OS 5. Note: Fire tablets running earlier versions of Fire OS have a soft key bar that allows for certain overrides to the default behavior within an app. Install and Use the Amazon Web App Tester.Automatically Scale an Element to Fill the Screen.Detect the Device Display Characteristics.
Take Screenshots on Fire Devices and Android Tablets. Fire Tablet Specifications: Fire HDX Models. Fire Tablet Specifications: Fire Models. Fire Tablet Specifications: Fire HD Models. Set Up Your Development Environment for Fire Tablets.
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