I want to create a tree view in android. I tried to implement an extensible listview with checkboxes. I want that when checking a group of list groups, all list items in the group are selected. The user can select individual items in the list.
Look at the images:
How do I do this in Android? The problem I am facing is that if I add a checkbox to the expandable list group, the list can no longer be decrypted.
Source Code :
activity_main.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="vertical" android:background="#f4f4f4" > <ExpandableListView android:id="@+id/lvExp" android:layout_height="match_parent" android:layout_width="match_parent" android:cacheColorHint="#00000000"/> </LinearLayout>
list_group.xml
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="wrap_content" android:orientation="vertical" android:padding="8dp" android:background="#CC7A00"> <CheckBox android:id="@+id/lblListHeaderCheckbox" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="" android:textSize="17dp" android:textColor="#ffffff"/> <TextView android:id="@+id/lblListHeader" android:layout_width="fill_parent" android:layout_height="wrap_content" android:paddingLeft="?android:attr/expandableListPreferredItemPaddingLeft" android:textSize="17dp" android:textColor="#ffffff" /> </LinearLayout>
list_item.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="55dip" android:orientation="vertical" android:background="#FFCC80"> <TextView android:id="@+id/lblListItem" android:layout_width="fill_parent" android:layout_height="wrap_content" android:textSize="17dip" android:paddingTop="5dp" android:paddingBottom="5dp" android:paddingLeft="?android:attr/expandableListPreferredChildPaddingLeft" android:textColor="#336699"/> </LinearLayout>
Mainactivity
public class MainActivity extends Activity { ExpandableListAdapter listAdapter; ExpandableListView expListView; List<String> listDataHeader; HashMap<String, List<String>> listDataChild; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); // get the listview expListView = (ExpandableListView) findViewById(R.id.lvExp); // preparing list data prepareListData(); listAdapter = new ExpandableListAdapter(this, listDataHeader, listDataChild); // setting list adapter expListView.setAdapter(listAdapter); // Listview Group click listener expListView.setOnGroupClickListener(new OnGroupClickListener() { @Override public boolean onGroupClick(ExpandableListView parent, View v, int groupPosition, long id) { // Toast.makeText(getApplicationContext(), // "Group Clicked " + listDataHeader.get(groupPosition), // Toast.LENGTH_SHORT).show(); return false; } }); // Listview Group expanded listener expListView.setOnGroupExpandListener(new OnGroupExpandListener() { @Override public void onGroupExpand(int groupPosition) { Toast.makeText(getApplicationContext(), listDataHeader.get(groupPosition) + " Expanded", Toast.LENGTH_SHORT).show(); } }); // Listview Group collasped listener expListView.setOnGroupCollapseListener(new OnGroupCollapseListener() { @Override public void onGroupCollapse(int groupPosition) { Toast.makeText(getApplicationContext(), listDataHeader.get(groupPosition) + " Collapsed", Toast.LENGTH_SHORT).show(); } }); // Listview on child click listener expListView.setOnChildClickListener(new OnChildClickListener() { @Override public boolean onChildClick(ExpandableListView parent, View v, int groupPosition, int childPosition, long id) { // TODO Auto-generated method stub Toast.makeText( getApplicationContext(), listDataHeader.get(groupPosition) + " : " + listDataChild.get( listDataHeader.get(groupPosition)).get( childPosition), Toast.LENGTH_SHORT) .show(); return false; } }); } /* * Preparing the list data */ private void prepareListData() { listDataHeader = new ArrayList<String>(); listDataChild = new HashMap<String, List<String>>(); for (int i=0; i<=10; i++) { listDataHeader.add("Header"+ i); // Adding child data List<String> child = new ArrayList<String>(); child.add("Child"+i); child.add("Child"+i); listDataChild.put(listDataHeader.get(i), child); // Header, Child data } } }
ExpandableListAdapter
public class ExpandableListAdapter extends BaseExpandableListAdapter { private Context _context; private List<String> _listDataHeader; // header titles // child data in format of header title, child title 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 Object getChild(int groupPosition, int childPosititon) { return this._listDataChild.get(this._listDataHeader.get(groupPosition)) .get(childPosititon); } @Override public long getChildId(int groupPosition, int childPosition) { return childPosition; } @Override public View getChildView(int groupPosition, final 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); return convertView; } @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 int getGroupCount() { return this._listDataHeader.size(); } @Override public long getGroupId(int groupPosition) { return groupPosition; } @Override public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) { String headerTitle = (String) getGroup(groupPosition); 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 boolean hasStableIds() { return false; } @Override public boolean isChildSelectable(int groupPosition, int childPosition) { return true; } }
How to achieve this requirement?