Solve the problem by using a simple Phone Dialer made by Android (simulating two people using Android to make a call, although the call is not allowed)

Finally, the problem was solved. The reason for this error was that the permission was incorrect due to my carelessness. As a result, the effect was always delayed, I was puzzled. I was in a dead corner. Fortunately, I finally corrected this error.

<Uses-Permission Android: Name = "android. Permission. call_phone"> </uses-Permission>

Is the error marked with a red letter above, resulting inProgramI wrote it:

<Uses-Permission Android: Name = "android. permission. call_privileged "> </uses-Permission>. Therefore, we keep this error in mind so that we can read it later and stay alert to avoid making the same mistake in the future.