title: Update multiple column with activeAndroid
body: <p>I want to update multiple cell of single row with active android. 
  some thing like this,</p>
  
  <pre><code>    new Update(Question.class).set("UserAnswer ="+answerID,
                                      "UserAnswerType = "+userAnswerType)
                                 .where("QID = ?", questionID).execute();
  </code></pre>
  
  <p>but that will gives me error. is there any other way to do this? or am i missing something?</p>
  
  <p>Here is my Question.class for reference</p>
  
  <pre><code>@Table(name = "Questions")
  public class Question extends Model {
  @Expose
  @Column(name = "QID")
  private Integer ID;
  
  @Expose
  @Column(name = "AnswerID")
  private Integer AnswerID;
  
  @Expose
  @Column(name = "UserAnswer")
  private Integer UserAnswer;
  
  @Expose
  @Column(name = "UserAnswerType")
  private Integer UserAnswerType;
  
  //Getter and setter methods for fields
  
  public Question() {
      // You have to call super in each constructor to create the table.
      super();
  }
  }
  </code></pre>