Solution to the problem of user prohibiting permission error when scanning QR code on Android

Solution to the problem of user prohibiting permission error when scanning QR code on Android

When I wrote a program that scans QR code, the scanning function was indeed implemented. The team leader said that if the user prohibits calling the camera, the program cannot crash. As a result, I crashed as soon as I ran. I searched for it online and it can be solved in this way.

try {
     ();
   } catch (Exception e) {  // When the user manually bans camera permissions, prevent the system from crashing      builder=new (this);
     (.camera_camcel_title);
     (.camera_camcel_content);
     (false);
     (, new () {
      @Override
      public void onClick(DialogInterface dialog, int which) {
        ();
        finish();
      }
     });
     ().show();
     return;
//    ();
   }

When calling (), rewrite the try..catch statement, create a new dialog and prompt the user for information. Remember to return to the end of the catch statement.

Thank you for reading, I hope it can help you. Thank you for your support for this site!