Question

I have a problem with saving an instance on screen orientation change. I have an array with a specific structure:

private ArrayList <MyObject> myArr;

And this sctructure is:

public MyObject{
    public variable1;
    //..... many variables here and one array :)
}

I need to save “myArr” array. How can I save this “variable”?

Answer 1

Basically, instance should be saved, using the way, described in Android Activity API Ref: you need to use onSaveInstanceState(Bundle). Also, You can just set android:configChanges="orientation" in your manifest for an activity to prevent it’s recreation (so where won’t be any need for state saving presented).

To save objects from the question in onSaveInstanceState(Bundle) to the Bundle:

• Implement Parcelable by MyObject (e.g. example can be found here etc.)
• Put ArrayList in the bundle by putParcelableArrayList() in onSaveInstanceState() and get back by getParcelableArrayList() in onCreate() after rotation;