+    /**
+     * Launch an intent to request the PIN code to the user before letting him use the app
+     */
+    private void requestPinCode() {
+        boolean pinStart = false;
+        SharedPreferences appPrefs = PreferenceManager.getDefaultSharedPreferences(getApplicationContext());
+        pinStart = appPrefs.getBoolean("set_pincode", false);
+        if (pinStart) {
+            Intent i = new Intent(getApplicationContext(), PinCodeActivity.class);
+            i.putExtra(PinCodeActivity.EXTRA_ACTIVITY, "PreviewImageActivity");
+            startActivity(i);
+        }
+    }
+