Comment définir l'état par défaut de la liste extensible sur Expanded?

Question

Tout ce que j'ai est 3 liste extensible séparée dans ma même mise en page Extension BaseExpandableListAdapter il fonctionne comme prévu mais je veux faire toute la liste extensible à l'état étendu par défaut et que vous voulez empêcher leur effondrement.

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<String> subtask_parent = new ArrayList<String>(); 
private ArrayList<String> subtask_child = new ArrayList<String>(); 

private ArrayList<String> assignto_parent = new ArrayList<String>(); 
private ArrayList<HashMap> assignto_child = new ArrayList<HashMap>(); 

private ArrayList<String> note_parent = new ArrayList<String>(); 
private ArrayList<HashMap> note_child = new ArrayList<HashMap>(); 

@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 < 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<String, String> note = new HashMap<String, String>(); 

    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<String, String>(); 
    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<String, String> assignto_singleitem = new HashMap<String, String>(); 

    assignto_singleitem.put("title","Rafi"); 
    assignto_singleitem.put("image", "images"); 
    assignto_child.add(assignto_singleitem); 

    assignto_singleitem = new HashMap<String, String>(); 
    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 < listAdapter.getGroupCount(); i++) { 
     View groupItem = listAdapter.getGroupView(i, false, null, listView); 
     groupItem.measure(desiredWidth, View.MeasureSpec.UNSPECIFIED); 

     totalHeight += groupItem.getMeasuredHeight(); 

     if (((listView.isGroupExpanded(i)) && (i != group)) 
       || ((!listView.isGroupExpanded(i)) && (i == group))) { 
      for (int j = 0; j < 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 < 10) 
     height = 200; 
    params.height = height; 
    listView.setLayoutParams(params); 
    listView.requestLayout(); 

} 

}

Answer 1

ExpandableListView elv = (ExpandableListView) findViewById(R.id.elv_main); 
elv.setAdapter(adapter); 
for(int i=0; i < adapter.getGroupCount(); i++) 
    elv.expandGroup(i);