title: Expandable listView row item not showing Serially
body: <p>Here is my Data resource for the list item. The Problem is occurred that list View item not added synchronously. Are anyone can say? why this occurred? Are any issues in my code?</p>
  
  <h2>Data Pump:</h2>
  
  <pre><code>    public class SemesterDataPump {
  public static HashMap&lt;String, List&lt;String&gt;&gt; getData() {
      HashMap&lt;String, List&lt;String&gt;&gt; semesterListDetails = new HashMap&lt;String, List&lt;String&gt;&gt;();
  
      List&lt;String&gt; firstSemester = new ArrayList&lt;&gt;();
      firstSemester.add("Computer Programming Concept");
      firstSemester.add("Electrical Device");
      firstSemester.add("Deferential and Integration Calculus");
      firstSemester.add("Physics ");
  
      List&lt;String&gt; secondSemester = new ArrayList&lt;&gt;();
      secondSemester.add("Electronics ");
      secondSemester.add("English");
      secondSemester.add("Structure Programming Language ");
  
      List&lt;String&gt; thirdSemester = new ArrayList&lt;&gt;();
      thirdSemester.add("Bangladesh Studies ");
      thirdSemester.add("DAta Structure");
      thirdSemester.add("Digital logical Design");
      thirdSemester.add("Public Speaking");
  
     .........
  
      semesterListDetails.put("1st Semester",firstSemester);
      semesterListDetails.put("2nd Semester",secondSemester);
      semesterListDetails.put("3rd Semester",thirdSemester);
  </code></pre>
  
  <p>...........</p>
  
  <pre><code>    return semesterListDetails;
  }
  </code></pre>
  
  <p><a href="https://i.stack.imgur.com/Nkmqr.png" rel="nofollow noreferrer">Here is the output</a></p>