Dynamic time display crash on orientation - nullpointerexception

Question

I have a layout that will display a TextView which is used to display a ticking time.I followed the codes from this link
How to Display current time that changes dynamically for every second in android
but I get an error of
java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.TextView.setText(java.lang.CharSequence)' on a null object reference
I had the same problem here but I fixed it
Intent extras null on configuration change
Here are the Java codes
void clockTicking(){
final CountDownTimer newtimer = new CountDownTimer(1000000000, 1000) {
public void onTick(long millisUntilFinished) {
timeDisplay = (TextView)findViewById(R.id.txtTime);
Calendar c = Calendar.getInstance();
timeDisplay.setText(c.get(Calendar.HOUR)+":"+c.get(Calendar.MINUTE)+":"+c.get(Calendar.SECOND)+" PM");
}
public void onFinish() {
}
};
newtimer.start();

Answer 1

In your code timeDisplay object is null.
Make sure your textview id is correct. Double check this line timeDisplay = (TextView)findViewById(R.id.txtTime);
I think your id txtTime is incorrect.
Hope it will helpful.

Answer 2

Okay so I finally fixed it,the only reason why it crashed was because during orientation the layout I used has no TextView which Mitesh Vanaliya stated was correct.So I fixed it by turning it off upon orientation using this code thanks to Ayyappan from
How to Display current time that changes dynamically for every second in android
Turning off the clock
void clockUnTicking(){
CountDownTimer newtimer = new CountDownTimer(1000000000, 1000) {
public void onTick(long millisUntilFinished) {
timeDisplay = (TextView)findViewById(R.id.txtTime);
Calendar c = Calendar.getInstance();
timeDisplay.setText(c.get(Calendar.HOUR)+":"+c.get(Calendar.MINUTE)+":"+c.get(Calendar.SECOND));
}
public void onFinish() {
}
};
newtimer.cancel();
}
to turn it on just replace newtimer.cancel(); with newtimer.start()