From “Pro Android 2” NOTE: Seeing Parcelable might have triggered the question, why is Android not using the built-in Java serialization mechanism? It turns out that the Android team came to the conclusion that the serialization in Java is far too slow to satisfy Android’s interprocess-communication requirements. So the team built the Parcelable solution. The … Read more
In Android we cannot just pass objects to activities. To do this the objects must either implement Serializable or Parcelable interface. Serializable Serializable is a standard Java interface. You can just implement Serializable interface and add override methods. The problem with this approach is that reflection is used and it is a slow process. This … Read more
Bitmap implements Parcelable, so you could always pass it with the intent: Intent intent = new Intent(this, NewActivity.class); intent.putExtra(“BitmapImage”, bitmap); and retrieve it on the other end: Intent intent = getIntent(); Bitmap bitmap = (Bitmap) intent.getParcelableExtra(“BitmapImage”);
You can find some examples of this here, here (code is taken here), and here. You can create a POJO class for this, but you need to add some extra code to make it Parcelable. Have a look at the implementation. public class Student implements Parcelable{ private String id; private String name; private String grade; … Read more
You can pass an ArrayList the same way, if the E type is Serializable. You would call the putExtra (String name, Serializable value) of Intent to store, and getSerializableExtra (String name) for retrieval. Example: ArrayList<String> myList = new ArrayList<String>(); intent.putExtra(“mylist”, myList); In the other Activity: ArrayList<String> myList = (ArrayList<String>) getIntent().getSerializableExtra(“mylist”);