title: How to set Expandable List default state to Expanded?
body: <p>All I have is 3 separate expandable list in my same layout extending BaseExpandableListAdapter it is working as expected but I want to make all expandable list to be in expanded state by default and want to prevent them from collapse .</p>
  
  <pre><code>public class MainActivity extends ActionBarActivity {
  
  private ExpandableListView subtask_explist , assignto_explist , note_explist;
  
  CheckBox checkBox_card ,checkBox_subtask ;
  TextView card_textview;
  LinearLayout linearLayout_card ;
  RelativeLayout relativeLayout_card;
  private android.support.v7.widget.Toolbar toolbar;
  Context context;
  
  private ArrayList&lt;String&gt; subtask_parent = new ArrayList&lt;String&gt;();
  private ArrayList&lt;String&gt; subtask_child = new ArrayList&lt;String&gt;();
  
  private ArrayList&lt;String&gt; assignto_parent = new ArrayList&lt;String&gt;();
  private ArrayList&lt;HashMap&gt; assignto_child = new ArrayList&lt;HashMap&gt;();
  
  private ArrayList&lt;String&gt; note_parent = new ArrayList&lt;String&gt;();
  private ArrayList&lt;HashMap&gt; note_child = new ArrayList&lt;HashMap&gt;();
  
  @Override
  protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.activity_main);
  
      context = getApplicationContext();
  
      toolbar = (android.support.v7.widget.Toolbar) findViewById(R.id.app_bar);
      setSupportActionBar(toolbar);
  
      getSupportActionBar().setHomeButtonEnabled(true);
      getSupportActionBar().setDisplayHomeAsUpEnabled(true);
      getSupportActionBar().setDisplayShowTitleEnabled(false);
  
  
      subtask_explist = (ExpandableListView) findViewById(R.id.subtask_list_id);
      subtask_explist.setGroupIndicator(null);
      subtask_explist.setClickable(true);
  
      assignto_explist = (ExpandableListView) findViewById(R.id.assignto_list_id);
      assignto_explist.setGroupIndicator(null);
      assignto_explist.setClickable(true);
  
      note_explist = (ExpandableListView) findViewById(R.id.note_list_id);
      note_explist.setGroupIndicator(null);
      note_explist.setClickable(true);
  
      /*linearLayout_card = (LinearLayout) findViewById(R.id.card_layout);*/
      relativeLayout_card = (RelativeLayout) findViewById(R.id.card_layout);
  
      checkBox_card = (CheckBox) findViewById(R.id.cb_card);
      card_textview = (TextView) findViewById(R.id.card_text);
      checkBox_subtask = (CheckBox) findViewById(R.id.cb_subtask);
  
      checkBox_card.setOnClickListener(new View.OnClickListener() {
          @Override
          public void onClick(View v) {
              if (checkBox_card.isChecked()){
                  relativeLayout_card.setBackgroundColor(getResources().getColor(R.color.selected_color));
                  card_textview.setBackground(getResources().getDrawable(R.drawable.border_selected));
                  card_textview.setPadding(23, 0, 0, 0);
              }
              else{
                  relativeLayout_card.setBackgroundColor(getResources().getColor(R.color.white_color));
                  card_textview.setBackground(getResources().getDrawable(R.drawable.border));
                  card_textview.setPadding(23, 0, 0, 0);
              }
          }
      });
  
      setSubtaskParentData();
      setSubtaskChildData();
  
      setAssigntoParentData();
      setAssigntoChildData();
  
      setNoteParentData();
      setNoteChildData();
  
      setAdapters();
      setOnclickListner();
  
  }
  
  private void setOnclickListner() {
  
      subtask_explist.setOnGroupClickListener(new ExpandableListView.OnGroupClickListener() {
  
          @Override
          public boolean onGroupClick(ExpandableListView parent, View v,
                                      int groupPosition, long id) {
              setListViewHeight(parent, groupPosition);
              return false;
          }
      });
  
      assignto_explist.setOnGroupClickListener(new ExpandableListView.OnGroupClickListener() {
  
          @Override
          public boolean onGroupClick(ExpandableListView parent, View v,
                                      int groupPosition, long id) {
              setListViewHeight(parent, groupPosition);
              return false;
          }
      });
  
      note_explist.setOnGroupClickListener(new ExpandableListView.OnGroupClickListener() {
  
          @Override
          public boolean onGroupClick(ExpandableListView parent, View v,
                                      int groupPosition, long id) {
              setListViewHeight(parent, groupPosition);
              return false;
          }
      });
  }
  
  private void setAdapters() {
      // Create the Adapter
      SubtaskExpandableAdapter subtaskExpandableAdapter = new SubtaskExpandableAdapter(subtask_parent, subtask_child);
      subtaskExpandableAdapter.setInflater((LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE), this);
      subtask_explist.setAdapter(subtaskExpandableAdapter);
      for (int i=0; i &lt; subtaskExpandableAdapter.getGroupCount(); i++)
          subtask_explist.expandGroup(i);
  
      AssigntoExpandableAdapter assigntoExpandableAdapter = new AssigntoExpandableAdapter(context , assignto_parent, assignto_child);
      assigntoExpandableAdapter.setInflater((LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE), this);
      assignto_explist.setAdapter(assigntoExpandableAdapter);
  
      NoteExpandableAdapter noteExpandableAdapter = new NoteExpandableAdapter(note_parent, note_child);
      noteExpandableAdapter.setInflater((LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE), this);
      note_explist.setAdapter(noteExpandableAdapter);
  }
  
  private void setNoteChildData() {
      HashMap&lt;String, String&gt; note = new HashMap&lt;String, String&gt;();
  
      note.put("title","Rafi");
      note.put("msg", "Secondary line text Lorem ipsum dolor sit amet, consectetur adipiscing elit. Nam massa quam.");
      note_child.add(note);
  
      note = new HashMap&lt;String, String&gt;();
      note.put("title","Prem");
      note.put("msg","Secondary line text Lorem ipsum dolor sit amet, consectetur adipiscing elit. Nam massa quam.");
      note_child.add(note);
  }
  
  private void setNoteParentData() {
      note_parent.add("ADD A NOTE");
  }
  
  
  private void setAssigntoChildData() {
      HashMap&lt;String, String&gt; assignto_singleitem = new HashMap&lt;String, String&gt;();
  
      assignto_singleitem.put("title","Rafi");
      assignto_singleitem.put("image", "images");
      assignto_child.add(assignto_singleitem);
  
      assignto_singleitem = new HashMap&lt;String, String&gt;();
      assignto_singleitem.put("title","Prem");
      assignto_singleitem.put("image","images2");
      assignto_child.add(assignto_singleitem);
  }
  
  private void setAssigntoParentData() {
      assignto_parent.add("ASSIGN TO");
  }
  
  private void setSubtaskParentData() {
      subtask_parent.add("ADD SUBTASKS");
  }
  
  private void setSubtaskChildData() {
      subtask_child.add("Single line item");
      subtask_child.add("Single line item");
      subtask_child.add("Single line item");
  }
  
  
  private void setListViewHeight(ExpandableListView listView,
                                 int group) {
      ExpandableListAdapter listAdapter = (ExpandableListAdapter) listView.getExpandableListAdapter();
      int totalHeight = 0;
      int desiredWidth = View.MeasureSpec.makeMeasureSpec(listView.getWidth(),
              View.MeasureSpec.EXACTLY);
      for (int i = 0; i &lt; listAdapter.getGroupCount(); i++) {
          View groupItem = listAdapter.getGroupView(i, false, null, listView);
          groupItem.measure(desiredWidth, View.MeasureSpec.UNSPECIFIED);
  
          totalHeight += groupItem.getMeasuredHeight();
  
          if (((listView.isGroupExpanded(i)) &amp;&amp; (i != group))
                  || ((!listView.isGroupExpanded(i)) &amp;&amp; (i == group))) {
              for (int j = 0; j &lt; listAdapter.getChildrenCount(i); j++) {
                  View listItem = listAdapter.getChildView(i, j, false, null,
                          listView);
                  listItem.measure(desiredWidth, View.MeasureSpec.UNSPECIFIED);
  
                  totalHeight += listItem.getMeasuredHeight();
  
              }
          }
      }
  
      ViewGroup.LayoutParams params = listView.getLayoutParams();
      int height = totalHeight
              + (listView.getDividerHeight() * (listAdapter.getGroupCount() - 1));
      if (height &lt; 10)
          height = 200;
      params.height = height;
      listView.setLayoutParams(params);
      listView.requestLayout();
  
  }
  </code></pre>
  
  <p>}</p>