Accessing instance of the parent activity?

Question

Suppose I have a class first.java (activity class) and I start another activity in this class (second.java - activity class).

How can I access the instance of first.java from second.java?

Can someone give me a good explanation on this... An example would be great...

Answer 1

If you need your second activity to return some data to your first activity I recommend you use startActivityForResult() to start your second activity. Then in onResult() in your first activity you can do the work needed.

In First.java where you start Second.java:

Intent intent = new Intent(this, Second.class); int requestCode = 1; // Or some number you choose startActivityForResult(intent, requestCode); 

The result method:

protected void onActivityResult (int requestCode, int resultCode, Intent data) {   // Collect data from the intent and use it   String value = data.getString("someValue"); } 

In Second.java:

Intent intent = new Intent(); intent.putExtra("someValue", "data"); setResult(RESULT_OK, intent); finish(); 

If you do not wish to wait for the Second activity to end before you do some work in the First activity, you could instead send a broadcast which the First activity reacts to.