How to Detect if an app is installed in device?

If you ever need to know if a particular app is installed on the user's device, you can use the PackageManager.  From a Context class (e.g. an Activity or a Service) you can call getPackageManager().  This gives you a variety of methods, one of which is getPackageInfo().  Below is a method you might use.  You might call it like this:

isAppInstalled("com.simexusa.campusmaps_full");

private boolean isAppInstalled(String uri) {

PackageManager pm = getPackageManager();

boolean installed = false;

try {

pm.getPackageInfo(uri, PackageManager.GET_ACTIVITIES);

installed = true;

} catch (PackageManager.NameNotFoundException e) {

installed = false;

}

return installed;

}