Detect an application is installed or not?

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From Android How-to’s

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 packageName) {
    PackageManager pm = getPackageManager();
    boolean installed = false;
    try {
       pm.getPackageInfo(packageName, PackageManager.GET_ACTIVITIES);
       installed = true;
    } catch (PackageManager.NameNotFoundException e) {
       installed = false;
    }
    return installed;
}

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