This class allows you to preserve Objects in activities after recreation.

gistfile1.java

/**
 * Allows preservation of non-context objects after i.e. rotation of the device.
 * 
 * Usage:
 * 
 * // Wrapper for this instance.
 * private final ObjectStoreWrapper objects = new ObjectStoreWrapper(1);
 * 
 * // Save a random Object, put the ID returned by the ObjectStore in the Bundle.
 * public void onSaveInstanceState(Bundle outState) {
 * 		outState.putInt("object", objects.store(new Object()));
 * }
 * 
 * public void onCreate(Bundle savedInstanceState) {
 * 		super.onCreate(savedInstanceState);
 * 		if(savedInstanceState != null) {
 * 			// ID of the stored Object.
 * 			int storeID = savedInstanceState.getInt("object");
 * 
 * 			// Grab the object from the ObjectStore.
 * 			Object o = objects.get(storeID);
 * 		}
 * }
 */

import android.util.SparseArray;

public class ObjectStore {
	private static SparseArray<SparseArray<Object>> store = new SparseArray<SparseArray<Object>>();
	public static int store(int instance, Object object) {
		final SparseArray<Object> list = instance(instance);
		int i = 0;
		while(list.get(i) != null) {
			i++;
		}
		list.put(i, object);
		return i;
		
	}
	
	public static void remove(int instance, int id) {
		instance(instance).remove(id);
	}
	
	public static void clear(int instance) {
		instance(instance).clear();
	}
	
	public static Object get(int instance, int id) {
		return instance(instance).get(id);
	}
	
	private static SparseArray<Object> instance(int instance) {
		SparseArray<Object> s = store.get(instance);
		if(s == null) {
			s = new SparseArray<Object>();
			store.put(instance, s);
		}
		return s;
	}
	
	public static class ObjectStoreWrapper {
		final int instance;
		
		public ObjectStoreWrapper(int instance) {
			this.instance = instance;
		}
		
		public int store(Object object) {
			return ObjectStore.store(instance, object);
		}
		
		public Object get(int id) {
			return ObjectStore.get(instance, id);
		}
		
		public void remove(int id) {
			ObjectStore.remove(instance, id);
		}
		
		public void clear() {
			ObjectStore.clear(instance);
		}
	}
}