Question

How could I write a code which can tell me that android market is installed on your android phone?

Answer 1

There are two ways. You can use the already mentioned getPackageManager() and getApplicationInfo() (if the package is not found, a PacketManager.NameNotFoundException will be thrown – see here). Android Market’s package name is com.android.vending.

However, you can also create a dummy intent for searching the market and check how it is handled. If the resulting list has at least one entry, you can be sure that Android Market is installed:

Intent market = new Intent(Intent.ACTION_VIEW, Uri.parse("market://search?q=dummy"));
PackageManager manager = getPackageManager();
List<ResolveInfo> list = manager.queryIntentActivities(mmarket, 0);