Fix #87 Wrong Result in Simulator Learn Spelling

Author: scopeInfinity

source-code/app/src/main/java/org/buildmlearn/toolkit/learnspelling/DataManager.java

@@ -162,7 +162,8 @@ public void incrementWrong() {
 
     public void reset() {
         countCorrect = 0;
-        mList.clear();
+        if (mList!=null)
+            mList.clear();
         countIndex = 0;
         countWrong = 0;
     }

source-code/app/src/main/java/org/buildmlearn/toolkit/learnspelling/SpellingMainFragment.java

@@ -77,6 +77,7 @@ public void onClick(View v) {
         });
 
         mManager = DataManager.getInstance();
+        mManager.reset();
         mManager.readXml(getArguments().getString(Constants.SIMULATOR_FILE_PATH));
         mTv_Title.setText(mManager.getTitle());
         mTv_Author.setText(mManager.getAuthor());