How to find which app was selected by Intent.createChooser?

This should work for early versions of Android.
Use intent PICKER instead of CHOOSER. The difference is that picker won't start the target intent automatically, but rather, it returns to onActivityResult() the target intent with the selected app's component name attached. Then you start the target intent in the callback as a 2nd step. A little bit of code should explain,

In MyActivity class

static final int REQUEST_CODE_MY_PICK = 1;

// Getting ready to start intent. Note: call startActivityForResult()
... launchIntent = the target intent you want to start;
Intent intentPick = new Intent();
intentPick.setAction(Intent.ACTION_PICK_ACTIVITY);
intentPick.putExtra(Intent.EXTRA_TITLE, "Launch using");
intentPick.putExtra(Intent.EXTRA_INTENT, launchIntent);
this.startActivityForResult(intentPick, REQUEST_CODE_MY_PICK);
// You have just started a picker activity,
// let's see what user will pick in the following callback

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data)
{
    if (requestCode == REQUEST_CODE_MY_PICK) {
         String appName = data.getComponent().flattenToShortString();
         // Now you know the app being picked.
         // data is a copy of your launchIntent with this important extra info added.

         // Don't forget to start it!
         startActivity(data);
    }
}

How to tell which app was selected by Intent.createChooser?