title: Can I edit .txt file opening app programmatically
body: <p><img src="https://i.stack.imgur.com/6DH6w.png" alt="Can I edit .txt file opening app programmatically?"></p>
  
  <p>I wanna develop a app manager, and implements function like this: edit different type(with different suffix) opening app, or clear default. Is this possible in Android?</p>