Question

I have 2 activities, A & B for example.
I navigate to Activity B within Activity A using startActivity()

My question is when I’m on Activity B, how can I get access to activity A ?

Thanks,

Answer 1

It really depends on what you want to do, and why you think you need that access. One thing you can do is pass data into an activity using intent.putExtra and then startActivityForResult and listen for results in onActivityResult. Can you give more information on what exactly you want to do?

To perform a method when an activity finishes, call the ‘child’ activity like this:

Intent child = new Intent(this, ChildActivity.class);
startActivityForResult(child, CHILD_CODE);

where CHILD_CODE is a nonnegative integer field. Now, you have to set a result in the ‘child’ activity (the one you started with onActivityResult).

    Intent resultIntent = new Intent();
    setResult(Activity.RESULT_OK, resultIntent);
    finish();

now in your ‘parent’ activity, implement the onActivityResult method like this:

protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);

    switch (requestCode) {
    case CHILD_CODE:
        if (resultCode == Activity.RESULT_OK) {
            yourMethod();
        }
    }
}