APP_Activity_TranslucentBlurActivity

[TranslucentBlurActivity.java]

 getWindow().setFlags(WindowManager.LayoutParams.FLAG_BLUR_BEHIND,
                WindowManager.LayoutParams.FLAG_BLUR_BEHIND);

[Manifest.xml]

 <activity android:name=".app.TranslucentBlurActivity"
                android:label="@string/activity_translucent_blur"
                android:theme="@style/Theme.Transparent">

[styles.xml] 

<style name="Theme.Translucent" parent="android:style/Theme.Translucent">
<item name="android:windowBackground">
                             @drawable/translucent_background</item>
        <item name="android:windowNoTitle">true</item>
        <item name="android:colorForeground">#fff</item>
    </style>