reference - http://www.androidhive.info/2013/07/android-expandable-list-view-tutorial/
JavaScript:
//@activity
<LinearLayout
android:id="@+id/frag_settings_row02_categories_child"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:padding="20dp" >
<ExpandableListView
android:id="@+id/frag_settings_row02_categories_explstv"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="5dip" />
</LinearLayout>
JavaScript:
//@the row
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:baselineAligned="false"
android:layout_marginLeft="35dp"
android:orientation="horizontal" >
<TextView
android:id="@+id/frag_settings_row_detail_02_categories_row_title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="15sp" />
</LinearLayout>
<CheckBox
android:id="@+id/frag_settings_row_detail_02_categories_row_check"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:focusable="false"
android:layout_alignParentRight="true"
android:gravity="right" />
</RelativeLayout>
JavaScript:
CREATE TABLE [categories]
(id INTEGER,
category_name TEXT,
parent_id INTEGER);
JavaScript:
//fragment.java
public class Frag_Settings extends Fragment implements OnItemClickListener {
// ////////////expandable
private Frag_Settings_Categories_Adapter listAdapter;
private ExpandableListView expListView;
private List<Frag_Settings_Categories> listHeader_Categories;
private HashMap<Frag_Settings_Categories, List<Frag_Settings_Categories>> listDataChild;
// ////////////expandable
@Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
expListView = (ExpandableListView) getActivity().findViewById(R.id.frag_settings_row02_categories_explstv);
listHeader_Categories = new ArrayList<Frag_Settings_Categories>();
listDataChild = new HashMap<Frag_Settings_Categories, List<Frag_Settings_Categories>>();
listAdapter = new Frag_Settings_Categories_Adapter(getActivity(), listHeader_Categories, listDataChild);
expListView.setAdapter(listAdapter);
//fetch recordset by DBASE
CategoriesDatasource categories_datasource = new CategoriesDatasource(getActivity());
// get HEAD CATEGORY (categories - parent_id=0)
for (Categories d : categories_datasource.getAllCategoriess()) {
if (d.getparent_id()==0)
listHeader_Categories.add(new Frag_Settings_Categories(d.getid(), d.getcategory_name(), false));
}
// get HEAD CHILD ITEMS (sub_categories - parent_id = cat_head)
List<Frag_Settings_Categories> child_Categories = null;
for (Frag_Settings_Categories cat_head : listHeader_Categories) {
// each time instantiate the list
child_Categories = new ArrayList<Frag_Settings_Categories>();
// get all sub_categories has parent the cat_head
for (Categories sub_cat : categories_datasource.getAllCategoriess()) {
if (sub_cat.getparent_id() == cat_head.getId()) {
child_Categories.add(new Frag_Settings_Categories(sub_cat.getid(), sub_cat.getcategory_name(), false));
}
}
//for each HEAD CATEGORY - hang children
listDataChild.put(cat_head, child_Categories);
}
}
JavaScript:
//Frag_Settings_Categories_Adapter.java
import java.util.HashMap;
import java.util.List;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseExpandableListAdapter;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.CompoundButton.OnCheckedChangeListener;
import android.widget.TextView;
public class Frag_Settings_Categories_Adapter extends BaseExpandableListAdapter {
private List<Frag_Settings_Categories> data;
private HashMap<Frag_Settings_Categories, List<Frag_Settings_Categories>> child;
private Context context;
public Frag_Settings_Categories_Adapter(Context context, List<Frag_Settings_Categories> items, HashMap<Frag_Settings_Categories, List<Frag_Settings_Categories>> listChildData) {
this.context = context;
this.data = items;
this.child = listChildData;
}
@Override
public Object getChild(int groupPosition, int childPosititon) {
return this.child.get(this.data.get(groupPosition)).get(childPosititon);
}
@Override
public long getChildId(int groupPosition, int childPosition) {
return childPosition;
}
// //////////////////// CHILD ITEM
@Override
public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent) {
if (convertView == null) {
LayoutInflater infalInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = infalInflater.inflate(R.layout.frag_settings_row_detail_02_categories_row, null);
}
ViewHolder holder;
holder = new ViewHolder();
holder.rowText = (TextView) convertView.findViewById(R.id.frag_settings_row_detail_02_categories_row_title);
holder.rowChk = (CheckBox) convertView.findViewById(R.id.frag_settings_row_detail_02_categories_row_check);
// http://stackoverflow.com/questions/12647001/listview-with-custom-adapter-containing-checkboxes
holder.rowChk.setTag(String.valueOf(groupPosition) + "|" + String.valueOf(childPosition)); // store the List<>position in TAG
holder.rowChk.setOnCheckedChangeListener(new OnCheckedChangeListener() {
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
String tag_txt = buttonView.getTag().toString();
int delimiter_pos =tag_txt.indexOf("|");
int head_id =Integer.parseInt(tag_txt.substring(0,delimiter_pos));
int child_id = Integer.parseInt(tag_txt.substring(delimiter_pos+1));
child.get(data.get(head_id)).get(child_id).setIs_selected(isChecked); // use of List<>position
}
});
// get CHILD items (search via HEAD item)
List<Frag_Settings_Categories> single = child.get(data.get(groupPosition));
// >>>>>>>>>> get - which item the view requires via childPosition
holder.rowText.setText(single.get(childPosition).getTitle());
if (single.get(childPosition).getIs_selected())
holder.rowChk.setChecked(true);
else
holder.rowChk.setChecked(false);
return convertView;
}
@Override
public int getChildrenCount(int groupPosition) {
return this.child.get(this.data.get(groupPosition)).size();
}
@Override
public Object getGroup(int groupPosition) {
return this.data.get(groupPosition);
}
@Override
public int getGroupCount() {
return this.data.size();
}
@Override
public long getGroupId(int groupPosition) {
return groupPosition;
}
// //////////////////// HEAD ITEM
@Override
public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) {
if (convertView == null) {
LayoutInflater infalInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = infalInflater.inflate(R.layout.frag_settings_row_detail_02_categories_row, null);
}
ViewHolder holder;
holder = new ViewHolder();
holder.rowText = (TextView) convertView.findViewById(R.id.frag_settings_row_detail_02_categories_row_title);
holder.rowChk = (CheckBox) convertView.findViewById(R.id.frag_settings_row_detail_02_categories_row_check);
// http://stackoverflow.com/questions/12647001/listview-with-custom-adapter-containing-checkboxes
holder.rowChk.setTag(Integer.valueOf(groupPosition)); // store the List<>position in TAG
holder.rowChk.setOnCheckedChangeListener(new OnCheckedChangeListener() {
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
data.get((Integer) buttonView.getTag()).setIs_selected(isChecked); // use of List<>position
notifyDataSetChanged(); //refresh view
}
});
holder.rowText.setText(data.get(groupPosition).getTitle());
if (data.get(groupPosition).getIs_selected()) {
holder.rowChk.setChecked(true);
manipulate_children_value((groupPosition),true);
} else {
holder.rowChk.setChecked(false);
manipulate_children_value(groupPosition,false);
}
return convertView;
}
private void manipulate_children_value(int head_position, Boolean val) {
// List<Frag_Settings_Categories> x = child.get(data.get(head_position));
//
// for (int i = 0; i < x.size(); i++) {
// child.get(data.get(head_position)).get(i).setIs_selected(val);
// }
// similar
for (Frag_Settings_Categories x : child.get(data.get(head_position))) {
x.setIs_selected(val);
}
}
@Override
public void notifyDataSetChanged() {
super.notifyDataSetChanged();
}
@Override
public boolean hasStableIds() {
//http://stackoverflow.com/a/18217552/1320686
return true;
}
@Override
public boolean isChildSelectable(int groupPosition, int childPosition) {
return true;
}
class ViewHolder {
TextView rowText;
CheckBox rowChk;
}
}
//Frag_Settings_Categories.java
public class Frag_Settings_Categories {
private int id;
private String title;
private Boolean is_selected;
public Frag_Settings_Categories(long id,String title, Boolean is_selected){
this.id=(int) id;
this.title=title;
this.is_selected=is_selected;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public Boolean getIs_selected() {
return is_selected;
}
public void setIs_selected(Boolean is_selected) {
this.is_selected = is_selected;
}
}