title: How to serialize null value when using Parcelable interface
body: <p>regarding my code example down, what shold I do if one Locable's variables is null? In example, now if l.getZoom() returns null, I got NullPointerException.</p>
  
  <pre><code>@Override
  public void writeToParcel(Parcel parcel, int arg1) {
      parcel.writeInt(count);
      for(Locable l:locableArr){
          parcel.writeInt(l.getOriginId());
          parcel.writeInt(l.getLocableType());
          parcel.writeInt(l.getZoom());
          parcel.writeDouble(l.getLatituda());
          parcel.writeDouble(l.getLongituda());
          parcel.writeString(l.getTitle());
          parcel.writeString(l.getSnipet());
      }
  
  }
  </code></pre>
  
  <p>Thanks!</p>