Avoid repeated dialogs

Call BadgeDialog only if no dialog is shown

app/src/main/java/fr/utc/simde/payutc/MainActivity.java

@@ -80,7 +80,8 @@ public class MainActivity extends NFCActivity {
 
     @Override
     protected void onIdentification(final String idBadge) {
-        badgeDialog(idBadge);
+        if (!dialog.isShowing())
+            badgeDialog(idBadge);
     }
 
     protected void delKey() {

app/src/main/java/fr/utc/simde/payutc/tools/Dialog.java

@@ -32,6 +32,8 @@ public class Dialog {
             this.alertDialog.dismiss();
     }
 
+    public Boolean isShowing() { return this.alertDialog != null && this.alertDialog.isShowing(); }
+
     public void createDialog() { createDialog((EditText) null); }
     public void createDialog(AlertDialog.Builder alertDialogBuilder) { createDialog(alertDialogBuilder, null); }
     public void createDialog(AlertDialog.Builder alertDialogBuilder, final EditText input) { this.alertDialogBuilder = alertDialogBuilder; createDialog(input); }