issue #763, #767 closed

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

@@ -1131,7 +1131,8 @@ public class PictogramActivity extends Activity implements VocabularyTalk.iVocab
         Intent nextActivity=null;
         Intent intent =getIntent();
         boolean student_view=intent.getBooleanExtra("student_view",false);
-        if (PCBcontext.getPcbdb().getCurrentUser().is_supervisor() || student_view) {
+
+        if (PCBcontext.getPcbdb()!=null && (PCBcontext.getPcbdb().getCurrentUser().is_supervisor() || student_view)) {
             switch (event.getAction()) {
                 case MotionEvent.ACTION_DOWN:
                     firstTouchX = event.getX();

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

@@ -119,7 +119,7 @@ public  class SerialActivity extends Activity   {
                 public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                     SharedPreferences settings = getSharedPreferences(PREFS_NAME, 0);
                     SharedPreferences.Editor editor = settings.edit();
-                    editor.putString("username", stuUsers.elementAt(position).get_name_stu());
+                    editor.putString("username", stuUsers.elementAt(position).get_nickname_stu());
                     editor.putString("password", stuUsers.elementAt(position).get_pwd_stu());
                     editor.commit();
                     new UserLogin().login(stuUsers.elementAt(position).get_nickname_stu(),