Find apps supporting your URL scheme in Android

gistfile1.java

Intent i = new Intent(Intent.ACTION_VIEW);
i.setData("mycustomscheme://test");

PackageManager manager = context.getPackageManager();
List<ResolveInfo> resolvedActivites = manager.queryIntentActivities(i, PackageManager.MATCH_DEFAULT_ONLY);
if (!resolvedActivities.isEmpty()) {
  // ... someone responds to the scheme
} else {
  // ... nobody does
}