title: How can i make a signle to another app?
body: <p>I am starting to program at android studio
  and i am thinking about an app that will prevent another app from opening
  if the password is in-correcrt(another app crated by my on the cellphone- not another activity).
  I thought about using a file but i think it wont work because you need to be specific on where the file is and i want my program to be dynamic.</p>