title: Can't get SharedPreferences with activity
body: <p>Sorry for my bad English.<br> 
  On my application, I save token (it's a web app) in shared preferences. In first activity I do this:<br></p>
  
  <pre><code>(token = 123)
  SharedPreferences sp = getPreferences(MODE_PRIVATE);
  Editor ed = sp.edit();
  ed.putString("token", Main.getToken()); 
  ed.commit();
  Log.d("Recieved token: ", sp.getString("token", "null")); // Recieved token: 123
  </code></pre>
  
  <p>As you see, shared prefs are saved. <br>
  I have another activity, which may be called from browser to share link. <br>
  Code: <br></p>
  
  <pre><code>sp = getPreferences(MODE_PRIVATE);
  Log.d("Token recieved: ", sp.getString("token", "null")); // null
  </code></pre>
  
  <p>But on another activity shared prefs return null. 
  What can I do?</p>