title: Programmatically change the permission of installing apk from unknown source in android device
body: <p>For allowing or preventing manually installation of apk file from sdcard we ticks/unticks the checkbox which says "Allow installation of app from unknown source".</p>
  
  <p>Can we do this Programmatically by avoiding any User Interface?</p>
  
  <p>Thanks,</p>
  
  <p>Nirav        </p>