Question

Assume we have two apps.

Is it possible for app A to have a button that allows someone to download app B without leaving app A? (Of course, the user would need to click the download button and give consent.)

Answer 1

Yes in android its possible but however you will need to know the name of the package of app B and use it to open the android market from app A so as to download app B .

Intent intent = new Intent(Intent.ACTION_VIEW);
intent.setData(Uri.parse("market://details?id=APP B PACKAGE NAME (Ex:com.ex.ui)"));
startActivity(intent);

this will now open the market and take you to the particular application and you can download . Place this code within the click listener of the DOWNLOAD BUTTON .