license comprobation on student selection

android/Pictogram/tabletlibrary/src/main/java/com/yottacode/pictogram/tabletlibrary/gui/login/StudentFragmentGrid.java

@@ -99,6 +99,23 @@ public class StudentFragmentGrid extends Fragment {
             if (this.nameStudents[i].equals(getString(R.string.addStudent)))
             if (this.nameStudents[i].equals(getString(R.string.addStudent)))
                 register_student(getActivity().getIntent().getIntExtra("sup_id", 0));
                 register_student(getActivity().getIntent().getIntExtra("sup_id", 0));
             else {
             else {
+
+                // checks if license is valid for this user
+                if(licenseStudents[i].equals("expired")){
+                    AlertDialog.Builder builder1 = new AlertDialog.Builder(getActivity());
+                    builder1.setMessage(R.string.loginNoLicenseMsg);
+                    builder1.setPositiveButton(
+                            R.string.accept,
+                            new DialogInterface.OnClickListener() {
+                                public void onClick(DialogInterface dialog, int id) {
+                                    dialog.cancel();
+                                }
+                            });
+                    AlertDialog alert11 = builder1.create();
+                    alert11.show();
+                    return;
+                }
+
                 new_user(i);
                 new_user(i);
                 download_supervisors(PCBcontext.getPcbdb().getCurrentUser().get_id_stu());
                 download_supervisors(PCBcontext.getPcbdb().getCurrentUser().get_id_stu());
             }
             }
@@ -117,7 +134,7 @@ public class StudentFragmentGrid extends Fragment {
 
 
         alert.setView(edittext);
         alert.setView(edittext);
 
 
-        alert.setPositiveButton("Ok", new DialogInterface.OnClickListener() {
+        alert.setPositiveButton(R.string.accept, new DialogInterface.OnClickListener() {
             public void onClick(DialogInterface dialog, int whichButton) {
             public void onClick(DialogInterface dialog, int whichButton) {
                 //What ever you want to do with the value
                 //What ever you want to do with the value
                 String license = edittext.getText().toString().replaceAll("[^a-zA-Z0-9]", "").toUpperCase();
                 String license = edittext.getText().toString().replaceAll("[^a-zA-Z0-9]", "").toUpperCase();
@@ -150,7 +167,7 @@ public class StudentFragmentGrid extends Fragment {
             }
             }
         });
         });
 
 
-        alert.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
+        alert.setNegativeButton(R.string.cancel, new DialogInterface.OnClickListener() {
             public void onClick(DialogInterface dialog, int whichButton) {
             public void onClick(DialogInterface dialog, int whichButton) {
                 // what ever you want to do with No option.
                 // what ever you want to do with No option.
             }
             }