sharred preference null pointer exception

//Activity-- mTweetApp.SetCaseInfo(type,teet); //storing in another class

public void SetCaseInfo(String PatientType,ArrayList arr){
   // All objects are from 
   SharedPreferences settings =setSharedPreferences(DEALSPOT开发者_JS百科R_PREFS,0);
   SharedPreferences.Editor editor = settings.edit();
   editor.putInt("arrayLength",arr.size());
   for(int i=0; i<=arr.size(); i++){
      editor.putInt("Teethsselected"+String.valueOf(i), (Integer) arr.get(i));
   }
   editor.putString("view", PatientType);
   for(int i=0; i<=arr.size(); i++){
       System.out.println("Teethsselected-----"+(Integer) arr.get(i)+"type--->"+PatientType);
   }
}

public void getCaseInfo() {
   SharedPreferences settings =getSharedPreferences(DEALSPOTR_PREFS, 0);
   int arraySize = settings.getInt("arrayLength", 0); 
   int teeth[] =new int[arraySize];
   for(int i=0; i<arraySize; i++){
      teeth[i] = ettings.getInt("Teethsselected"+String.valueOf(i),0);
   } 
   String type =settings.getString("view"," ");
}

how to fix this?

You don't commit your changes. put editor.commit(); into your set method.

First, when you write your pref values, no call of commit().
Second, the pref file is not written to /data/data/com.package.App/shared_prefs/pref_file.xml, hence when reading the SharedPreferences object is NULL.

SharedPreferences.Editor modifications should be commited.

   //Your code
   editor.putString("view", PatientType);
   for(int i=0; i<=arr.size(); i++){
       System.out.println("Teethsselected-----"+(Integer) arr.get(i)+"type--->"+PatientType);
   }
   //ADD THIS
   editor.commit();

SharedPreferences settings =setSharedPreferences(DEALSPOTR_PREFS,0);

instaed of above line, try using

SharedPreferences settings =getSharedPreferences(DEALSPOTR_PREFS,0);

and don't forget editor.commit() line once the values are added..