Send data to a parent activity onBackPressed

Issue

Is there a way to send updated data to a parent activity when back is pressed? I'd like to update the data in the bundle, but I don't see how I would access it.

For example, I have a gallery activity that opens an image viewer. Say a user scrolls through a dozen images and then backs out to the gallery. It would be ideal to update the focal image in the gallery with the last image they viewed.

At the moment I can't think of how to do so without a global setting.

Here's pseudo code of what I'd like to do (although this obviously wouldn't work):

Child:

@Override
public void onBackPressed() {
    getIntent().setData(currentImage);  // Not the right intent, obviously
    super.onBackPressed();
}

Parent:

@Override
public void onResume()
{
    super.onResume();
    Uri photoFocus = getIntent().getData();
    if (photoFocus != null)
        setPhotoFocus(photoFocus);
}

Solution

you can do

startActivityForResult()

from your parent activity when you start childactivity. onBackPressed, you can call setResult() in your childActivity.

In parentActivity the code will come to callback :

protected void onActivityResult(int requestCode, int resultCode, Intent data) { }

where you can extract the result set in setResult method

OR

use sharedPreferences

Answered By - Sushil