如何在活动、序列化或 SingleInstance 之间共享对象？

Question

I have certain data in the data model class and want to share this data/object to the other activity. Single Instance could be a good choice but want to finish my previous activity and hence will got null pointer. Please Suggest the best possible way to do it?

Answer 1

The best practice is to use intent object for that, putting either parcel or serialized data in his extras.

Static is dangerous since you must be always prepared for the case in which your application will be killed and restored.

Answer 2

Best possible way to use serialization, SingleInstance will not work here because you have to finish your activity.

Intent intent = new Intent(this, B.class);
ArrayList<String> data = new ArrayList<String>();
arrays.add("testing");
intent.putExtra("arrayList", data);
startActivity(intent);

you can use your objects instead of String and other side you can retrieve using this.

ArrayList<String> arrayList =(ArrayList<String>) getIntent().getSerializableExtra("arrayList");