How to start Chronometer using DialogFragment

[Android Central Question]

How to start a Chronometer when a DialogFragment is clicked (its OK button)? I have something like the following, but it gives null object reference error. I want the timer to start only after the user clicks the ok button in the dialogFragment.

public class A extends AppCompatActivity {
private Chronometer mChronometer;
 [MENTION=93274]overr[/MENTION]ide
   protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
       setContentView(R.layout.activity);
       mChronometer = findViewById(R.id.chronometer);
       mChronometer.setBase(SystemClock.elapsedRealtime());
}
public void startTimer(){
  // This method is start using Fragment.
   mChronometer.start();
}
}

 

[B. Diddy]

I moved this to the Software Development forum for more specific traffic.

 

[Rukbat]

Take a look at https://abhiandroid.com/ui/chronometer Maybe you can use some of the code there - or see what you're missing.

 

[Changbroot]

Take a look at https://abhiandroid.com/ui/chronometer Maybe you can use some of the code there - or see what you're missing.

Thanks, but I already looked at that and can't help me out. All I want is to start the damn Chronometer using a DialogFragment. It doesn't have to be directly using the fragment, but it must be started after the fragment is gone.