如何获得使用意图打开的活动的参考？

Question

Inside my MainActivity I open my SecondActivity

Intent intent = new Intent(this, SecondActivity.class);
startActivity(intent);

How do I get the reference of this instance of SecondActivity inside my MainActivity?

//inside MainActivity
SecondActivity object = // make it equal to instance created above

Answer 1

Pass your a handler to the second one via trigger intent, like this:

Intent intent = new Intent(this, SecondActivity.class);
intent.putExtra("Handler", handler);
startActivity(intent);

Then in your SecondActivity post message and data, maybe the instance of SecondActivity.this or another you like, to the handler.