Android read-write permission, has been authorized in the case, still (Permission denied)

Install the app for the first time, get read and Write permissions,

When reading a file, you will still encounter (Permission denied) error, the solution is to kill the app, re-open the app.

Should belong to some version of the system bug, until the app all processes is killed, the operating system will update the settings inside the permission settings, solution

The code determines whether to authorize a successful state and then captures the exception (Permission denied) that reads the file, and then restarts the app.

Android read-write permission, has been authorized in the case, still (Permission denied)