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Save The State Of The Control If Orientation Is Changed In Android

In this article, we will save the state of the control if orientation is changed.

Issue In State After Changing Orientation

To illustrate, add a timepicker on the screen and run the application in emulator. On screen load, I could see the current time

Picture showing the timepicker control with the current time

Click to Enlarge

Now modify the time

Picture showing the timepicker control with time modified manually

Click to Enlarge

And change the orientation

Picture showing changing the orientation of the screen

Click to Enlarge

Here the time is again set to default i.e. current time.

How To Save State?

To save the state of the control, you have to override onSaveInstanceState and onRestoreInstanceState method.

Here is the code

@Override
public void onSaveInstanceState(Bundle outState) {

  super.onSaveInstanceState(outState);

  TimePicker tp = (TimePicker) findViewById(R.id.timePicker1);
  outState.putInt("hour", tp.getHour());
  outState.putInt("minute", tp.getMinute());
}

@Override
protected void onRestoreInstanceState(Bundle savedInstanceState) {
  super.onRestoreInstanceState(savedInstanceState);
  TimePicker tp = (TimePicker) findViewById(R.id.timePicker1);
  tp.setHour(savedInstanceState.getInt("hour"));
  tp.setMinute(savedInstanceState.getInt("minute"));
}

Now run the application

On load

Click to Enlarge

Change the time

Click to Enlarge

After orientation

Click to Enlarge

Posted By -	Karan Gupta

Posted On -	Thursday, January 9, 2020

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