Comprueba si hay algún Activity que sea capaz de manejar un determinado Intent

isAvailable

    public static boolean isAvailable(Context ctx, Intent intent) {
        final PackageManager mgr = ctx.getPackageManager();
        List<ResolveInfo> list = mgr.queryIntentActivities(intent, PackageManager.MATCH_DEFAULT_ONLY);
        return list.size() > 0;
    }    
    
    public void openGoogleMaps(View v) {
        Uri geoLocation = Uri.parse("geo:36.782085,-2.815337?q=36.782085,-2.815337");
        Intent intent = new Intent(Intent.ACTION_VIEW);
        intent.setData(geoLocation);

        if (isAvailable(this, intent)) {
            startActivity(intent);
        } else {
            Toast.makeText(this, "El intent no se puede lanzar", Toast.LENGTH_LONG).show();
        }
    }