SharedPreferences preferences =
getSharedPreferences("mypref",MODE_PRIVATE);

    SharedPreferences.Editor prefsEditor=preferences.edit();
    Gson gson=new Gson();

    if(preferences.contains("counter")){
        counter=preferences.getInt("counter",0);
        prefsEditor.putInt("counter",++counter);

    }
    else{
        counter=0;
        prefsEditor.putInt("counter",++counter);
    }

    String json = gson.toJson(student);
    prefsEditor.putString("details"+counter,json);
    prefsEditor.commit();

    startActivity(intent);

SharedPreferences mPrefs =
                    getSharedPreferences("mypref",MODE_PRIVATE);
    int howMany=mPrefs.getInt("counter",0);
    Gson gson = new Gson();
    for(int i=1;i<=howMany;i++) {
        String json = mPrefs.getString("details" + howMany, "");
        Student student = gson.fromJson(json, Student.class);
        Log.e("tag","loop number"+i);
        Log.e("Tag", student.getName());
    }

05-23 10:45:48.212 18409-18409/com.example.com.applicationstudent
E/tag: loop number1
05-23 10:45:48.212 18409-18409/com.example.com.applicationstudent
E/Tag: suv
05-23 10:45:48.212 18409-18409/com.example.com.applicationstudent
E/tag: loop number2
05-23 10:45:48.212 18409-18409/com.example.com.applicationstudent
E/Tag: suv