title: All keys in SharedPreferences return same value
body: <p>I am using <em>Shared preferences</em> for the first time and getting errors. <br>
  my <strong>code</strong> is like this :</p>
  
  <pre><code>public class MainActivity extends Activity {
   static final String ONE = ""; 
   static final String TWO = "";
   private static SharedPreferences mSharedPreferences;
  
  @Override
  public void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.activity_main);
  
  SharedPreferences.Editor edi = mSharedPreferences.edit();
    edi.putString(ONE, "1");
    edi.putString(TWO, "2");
    edi.commit();
  
   String one = mSharedPreferences.getString(ONE,"1");
   String two = mSharedPreferences.getString(TWO,"2");
   System.out.println("Your Numbers: "one+ "   " + two);
   }
   }
  </code></pre>
  
  <p>Expected Output:</p>
  
  <pre><code> Your Numbers:  1   2
  </code></pre>
  
  <p>Console Output:</p>
  
  <pre><code> Your Numbers:  2   2
  </code></pre>
  
  <p>I can't figure out what i am doing wrong in it. Share your views.</p>