How to store values in onSaveInstanceState() and retrive?

Question

Am trying to store value of a arraylist in onSavedInstanceState() and get the values in a array list in onCreate method but it raises an eeror like unable to pause activity

here is my code

public void onSaveInstanceState(Bundle savedInstanceState) {
    savedInstanceState.putParcelable("Old", (Parcelable) profileDetails );
    super.onSaveInstanceState(savedInstanceState);
}

and in my onCreate()

if (savedInstanceState != null) { 
    profileDetails= (ArrayList<ProfileDetails>)savedInstanceState.getParcelable("Old");
}
else {
    profileDetails = GetSearchResults();
}

Answer 1

Bundle can store Serializable objects too.

Make sure than your class ProfileDetails implements Serializable.

After that you will be able to save/restore ArrayList in Bundle using:

savedInstanseState.putSerializable("Old", profileDetails);
...
profileDetails = (ArrayList<ProfileDetails>)savedInstanceState.getSerializable("Old");

Also you should guarantee that class ProfileDetails contains only fields of primitive types or Serializable (Strings, Arrays already implements this interface).

Answer 2

to save value in save instance state

@Override
public void onSaveInstanceState(Bundle savedInstanceState) {
  // Save UI state changes to the savedInstanceState.
  // This bundle will be passed to onCreate if the process is
  // killed and restarted.
  savedInstanceState.putBoolean("MyBoolean", true);
  savedInstanceState.putDouble("myDouble", 1.9);
  savedInstanceState.putInt("MyInt", 1);
  savedInstanceState.putString("MyString", "Welcome back to Android");
  // etc.
  super.onSaveInstanceState(savedInstanceState);
}

to restore value

@Override
  public void onRestoreInstanceState(Bundle savedInstanceState) {
    super.onRestoreInstanceState(savedInstanceState);
    // Restore UI state from the savedInstanceState.
    // This bundle has also been passed to onCreate.
    boolean myBoolean = savedInstanceState.getBoolean("MyBoolean");
    double myDouble = savedInstanceState.getDouble("myDouble");
    int myInt = savedInstanceState.getInt("MyInt");
    String myString = savedInstanceState.getString("MyString");
  }