ExpandableListview Like Android TreeView

Question

Hi, I am using TreeView with ExpandableListView . But I have some problems with the measures, which, unfortunately, I can not solve.

Here are the screenshots of the problem:

You can see that there are problems when measuring. While I'm new to Android, I really don't understand the onMeasure() method. I have 1 ExpandableListView and in it getChildView() I return CustomExapndableListView -s.

Here is the code:

ExpandableListAdapter:

 public class ExpandableListAdapter extends BaseExpandableListAdapter { private Context context; private List<String> listDataHeader; private HashMap<String, List<String>> listDataChild; public ExpandableListAdapter (Context context, List<String> listDataHeader, HashMap<String, List<String>> listChildData) { this.context = context; this.listDataHeader = listDataHeader; this.listDataChild = listChildData; } @Override public int getGroupCount() { return this.listDataHeader.size(); } @Override public int getChildrenCount(int groupPosition) { return this.listDataChild.get(this.listDataHeader.get(groupPosition)).size(); } @Override public Object getGroup(int groupPosition) { return this.listDataHeader.get(groupPosition); } @Override public Object getChild(int groupPosition, int childPosition) { return this.listDataChild.get(this.listDataHeader.get(groupPosition)).get(childPosition); } @Override public long getGroupId(int groupPosition) { return groupPosition; } @Override public long getChildId(int groupPosition, int childPosition) { return childPosition; } @Override public boolean hasStableIds() { return false; } @Override public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) { String headerTitle = (String) getGroup(groupPosition); Log.i("Header: ", " " + headerTitle); if(convertView == null) { LayoutInflater infalInflater = (LayoutInflater) this.context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); convertView = infalInflater.inflate(R.layout.list_group, null); } TextView lblListHeader = (TextView) convertView.findViewById(R.id.lblListHeader); lblListHeader.setTypeface(null, Typeface.BOLD); lblListHeader.setText(headerTitle); return convertView; } @Override public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent) { /*final String childText = (String) getChild(groupPosition, childPosition); if(convertView == null) { LayoutInflater infalInflater = (LayoutInflater) this.context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); convertView = infalInflater.inflate(R.layout.list_item, null); } TextView txtListChild = (TextView) convertView.findViewById(R.id.lblListItem); txtListChild.setText(childText);*/ String childText = (String) getChild(groupPosition, childPosition); if(listDataChild.containsKey(childText)){ Log.i("Child", "" + childText); CustomExpandableListView explv = new CustomExpandableListView(context); // explv.setRows(calculateRowCount((String)getGroup(groupPosition), null)); // ChildLayerExpandableListAdapter adapter = new ChildLayerExpandableListAdapter(context, listDataChild.get(getGroup(groupPosition)), listDataChild); Log.i("Opaaaa:", " " + getGroup(groupPosition)); List<String> newHeaders = new ArrayList <String>(); newHeaders.add(childText); // listDataChild.get(getGroup(groupPosition)) ExpandableListAdapter adapter = new ExpandableListAdapter(context, newHeaders, listDataChild); explv.setAdapter(adapter); explv.setGroupIndicator(null); convertView = explv; convertView.setPadding(20, 0, 0, 0); }else{ // if(convertView == null) { LayoutInflater infalInflater = (LayoutInflater) this.context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); convertView = infalInflater.inflate(R.layout.list_item, null); // } Log.i("Else:", " " + childText); TextView txtListChild = (TextView) convertView.findViewById(R.id.lblListItem); txtListChild.setText(childText); convertView.setPadding(20, 0, 0, 0); } return convertView; } private int calculateRowCount (String key, ExpandableListView listView) { int groupCount = listDataChild.get(key).size(); int rowCtr = 0; for(int i = 0; i < groupCount; i++) { rowCtr++; if( (listView != null) && (listView.isGroupExpanded(i))) rowCtr += listDataChild.get(listDataChild.get(key).get(i)).size() - 1; } return rowCtr; } @Override public boolean isChildSelectable(int groupPosition, int childPosition) { return true; } 

CustomExpandableListView:

  public class CustomExpandableListView extends ExpandableListView { private static final int HEIGHT = 20; private int rows; public void setRows(int rows) { this.rows = rows; } public CustomExpandableListView(Context context) { super(context); } public CustomExpandableListView(Context context, AttributeSet attrs) { super(context, attrs); } @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { heightMeasureSpec = MeasureSpec.makeMeasureSpec(500, MeasureSpec.AT_MOST); super.onMeasure(widthMeasureSpec, heightMeasureSpec); // setMeasuredDimension(getMeasuredWidth(), rows * HEIGHT); } } 

What I want to do when I expand the view, I want all the children to be shown, and I can just scroll down the ListView . Now some children are hidden under different children.

Thanks to Advance for your help.

Answer 1

@Code Word Sorry, I forgot to share my solution .

As I said, I implemented treeView with ListView . Here is my source code .

TreeElementI.java :

  public interface TreeElementI extends Serializable{ public void addChild(TreeElementI child); public String getId(); public void setId(String id); public String getOutlineTitle(); public void setOutlineTitle(String outlineTitle); public boolean isHasParent(); public void setHasParent(boolean hasParent); public boolean isHasChild(); public void setHasChild(boolean hasChild); public int getLevel(); public void setLevel(int level); public boolean isExpanded(); public void setExpanded(boolean expanded); public ArrayList<TreeElementI> getChildList(); public TreeElementI getParent(); public void setParent(TreeElementI parent); } 

TreeElement.java :

  public class TreeElement implements TreeElementI{ private String id; private String outlineTitle; private boolean hasParent; private boolean hasChild; private TreeElementI parent; private int level; private ArrayList<TreeElementI> childList; private boolean expanded; public TreeElement(String id, String outlineTitle) { super(); this.childList = new ArrayList<TreeElementI>(); this.id = id; this.outlineTitle = outlineTitle; this.level = 0; this.hasParent = true; this.hasChild = false; this.parent = null; } public TreeElement(String id, String outlineTitle, boolean hasParent, boolean hasChild, TreeElement parent, int level, boolean expanded) { super(); this.childList = new ArrayList<TreeElementI>(); this.id = id; this.outlineTitle = outlineTitle; this.hasParent = hasParent; this.hasChild = hasChild; this.parent = parent; if(parent != null) { this.parent.getChildList().add(this); } this.level = level; this.expanded = expanded; } @Override public void addChild(TreeElementI child) { this.getChildList().add(child); this.setHasParent(false); this.setHasChild(true); child.setParent(this); child.setLevel(this.getLevel() + 1); } @Override public String getId() { return this.id; } @Override public void setId(String id) { this.id = id; } @Override public String getOutlineTitle() { return this.outlineTitle; } @Override public void setOutlineTitle(String outlineTitle) { this.outlineTitle = outlineTitle; } @Override public boolean isHasParent() { return this.hasParent; } @Override public void setHasParent(boolean hasParent) { this.hasParent = hasParent; } @Override public boolean isHasChild() { return this.hasChild; } @Override public void setHasChild(boolean hasChild) { this.hasChild = hasChild; } @Override public int getLevel() { return this.level; } @Override public void setLevel(int level) { this.level = level; } @Override public boolean isExpanded() { return this.expanded; } @Override public void setExpanded(boolean expanded) { this.expanded = expanded; } @Override public ArrayList<TreeElementI> getChildList() { return this.childList; } @Override public TreeElementI getParent() { return this.parent; } @Override public void setParent(TreeElementI parent) { this.parent = parent; } } 

TreeViewClassifAdapter.java :

  public class TreeViewClassifAdapter extends BaseAdapter { private static final int TREE_ELEMENT_PADDING_VAL = 25; private List<TreeElementI> fileList; private Context context; private Bitmap iconCollapse; private Bitmap iconExpand; private Dialog dialog; private EditText textLabel; private XTreeViewClassif treeView; public TreeViewClassifAdapter(Context context, List<TreeElementI> fileList, Dialog dialog, EditText textLabel, XTreeViewClassif treeView) { this.context = context; this.fileList = fileList; this.dialog = dialog; this.textLabel = textLabel; this.treeView = treeView; iconCollapse = BitmapFactory.decodeResource(context.getResources(), R.drawable.x_treeview_outline_list_collapse); iconExpand = BitmapFactory.decodeResource(context.getResources(), R.drawable.x_treeview_outline_list_expand); } public List<TreeElementI> getListData() { return this.fileList; } @Override public int getCount() { return this.fileList.size(); } @Override public Object getItem(int position) { return this.fileList.get(position); } @Override public long getItemId(int position) { return position; } @Override public View getView(int position, View convertView, ViewGroup parent) { ViewHolder holder; convertView = View.inflate(context, R.layout.x_treeview_classif_list_item, null); holder = new ViewHolder(); holder.setTextView((TextView) convertView.findViewById(R.id.text)); holder.setImageView((ImageView) convertView.findViewById(R.id.icon)); convertView.setTag(holder); final TreeElementI elem = (TreeElementI) getItem(position); int level = elem.getLevel(); holder.getIcon().setPadding(TREE_ELEMENT_PADDING_VAL * (level + 1), holder.icon.getPaddingTop(), 0, holder.icon.getPaddingBottom()); holder.getText().setText(elem.getOutlineTitle()); if (elem.isHasChild() && (elem.isExpanded() == false)) { holder.getIcon().setImageBitmap(iconCollapse); } else if (elem.isHasChild() && (elem.isExpanded() == true)) { holder.getIcon().setImageBitmap(iconExpand); } else if (!elem.isHasChild()) { holder.getIcon().setImageBitmap(iconCollapse); holder.getIcon().setVisibility(View.INVISIBLE); } IconClickListener iconListener = new IconClickListener(this, position); TextClickListener txtListener = new TextClickListener((ArrayList<TreeElementI>) this.getListData(), position); holder.getIcon().setOnClickListener(iconListener); holder.getText().setOnClickListener(txtListener); return convertView; } private class ViewHolder { ImageView icon; TextView text; public TextView getText() { return this.text; } public void setTextView(TextView text) { this.text = text; } public ImageView getIcon() { return this.icon; } public void setImageView(ImageView icon) { this.icon = icon; } } /** * Listener For TreeElement Text Click */ private class TextClickListener implements View.OnClickListener { private ArrayList<TreeElementI> list; private int position; public TextClickListener(ArrayList<TreeElementI> list, int position) { this.list = list; this.position = position; } @Override public void onClick(View v) { treeView.setXValue(String.valueOf(list.get(position).getId())); dialog.dismiss(); } } /** * Listener for TreeElement "Expand" button Click */ private class IconClickListener implements View.OnClickListener { private ArrayList<TreeElementI> list; private TreeViewClassifAdapter adapter; private int position; public IconClickListener(TreeViewClassifAdapter adapter, int position) { this.list = (ArrayList<TreeElementI>) adapter.getListData(); this.adapter = adapter; this.position = position; } @Override public void onClick(View v) { if (!list.get(position).isHasChild()) { return; } if (list.get(position).isExpanded()) { list.get(position).setExpanded(false); TreeElementI element = list.get(position); ArrayList<TreeElementI> temp = new ArrayList<TreeElementI>(); for (int i = position + 1; i < list.size(); i++) { if (element.getLevel() >= list.get(i).getLevel()) { break; } temp.add(list.get(i)); } list.removeAll(temp); adapter.notifyDataSetChanged(); } else { TreeElementI obj = list.get(position); obj.setExpanded(true); int level = obj.getLevel(); int nextLevel = level + 1; for (TreeElementI element : obj.getChildList()) { element.setLevel(nextLevel); element.setExpanded(false); list.add(position + 1, element); } adapter.notifyDataSetChanged(); } } } } 

I hope this is not too late and this source code will help you.