App leave blank space in bottom

Guys My apps are leaving a blank space for navigation buttons on the bottom of screen.
Please help me rectify that

as we can a blank space is left on the bottom whereas other apps are normal.

Here is my style.xml code:

<style name="AppBaseTheme" parent="android:Theme.Light"> </style>

Here is the activity code in Manifest file :

  `< activity
        android:name="unknown"            
        android:label="@string/app_name"
        android:launchMode="singleInstance"
        android:theme="@android:style/Theme.Translucent.NoTitleBar" >`

EDIT : I did everything but nothing worked but the problems seems with the editors. I created an app with android studio with all the same code and themes It shows it fine but When I use eclipse, it show the blank space in the bottom. This is so annoying.

from App leave blank space in bottom