72.4 Requesting Permission at Runtime
A permission request is made via a call to the requestPermissions() method of the ActivityCompat class. When this method is called, the permission request is handled asynchronously and a method named onRequestPermissionsResult() is called when the task is completed.
The requestPermissions() method takes as arguments a reference to the current activity, together with the identifier of the permission being requested and a request code. The request code can be any integer value and will be used to identify which request has triggered the call to the onRequestPermissionsResult() method. Modify the MainActivity.java file to declare a request code and request recording permission in the event that the permission check failed:
.
.
import androidx.core.content.ContextCompat;
.
.
public class MainActivity extends AppCompatActivity {
private static String TAG = "PermissionDemo";
...