Question

i have developed one xml parsing exmaple.here i have to use expandable listview.but i can’t do develop this.please help me hoe is to do.

This is code:

 public class CustomExpandableListExampleActivity extends ExpandableListActivity {

ExpandableListAdapter mAdapter;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    // Set up our adapter
    mAdapter = new MyExpandableListAdapter();
    setListAdapter(mAdapter);
    registerForContextMenu(getExpandableListView());
}

@Override
public void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo) {
    menu.setHeaderTitle("Sample menu");
    menu.add(0, 0, 0, "Sample action");
}

@Override
public boolean onContextItemSelected(MenuItem item) {
    ExpandableListContextMenuInfo info = (ExpandableListContextMenuInfo) item.getMenuInfo();

    String title = ((TextView) info.targetView).getText().toString();

    int type = ExpandableListView.getPackedPositionType(info.packedPosition);
    if (type == ExpandableListView.PACKED_POSITION_TYPE_CHILD) {
        int groupPos = ExpandableListView.getPackedPositionGroup(info.packedPosition);
        int childPos = ExpandableListView.getPackedPositionChild(info.packedPosition);
        Toast.makeText(this, title + ": Child " + childPos + " clicked in group " + groupPos,
                Toast.LENGTH_SHORT).show();
        return true;
    } else if (type == ExpandableListView.PACKED_POSITION_TYPE_GROUP) {
        int groupPos = ExpandableListView.getPackedPositionGroup(info.packedPosition);
        Toast.makeText(this, title + ": Group " + groupPos + " clicked", Toast.LENGTH_SHORT).show();
        return true;
    }

    return false;
}

public class MyExpandableListAdapter extends BaseExpandableListAdapter {
    // Sample data set.  children[i] contains the children (String[]) for groups[i].
    private String[] groups = { "Order Info", "Customer Info" };
    private String[][] children = {
            { "abc", "xyz", "ash", "anu" },
            { "SSE", "TJ", "PM", "SE" },

    };

    public Object getChild(int groupPosition, int childPosition) {
        return children[groupPosition][childPosition];
    }

    public long getChildId(int groupPosition, int childPosition) {
        return childPosition;
    }

    public int getChildrenCount(int groupPosition) {
        return children[groupPosition].length;
    }

    public TextView getGenericView() {
        // Layout parameters for the ExpandableListView
        AbsListView.LayoutParams lp = new AbsListView.LayoutParams(
                ViewGroup.LayoutParams.MATCH_PARENT, 64);

        TextView textView = new TextView(CustomExpandableListExampleActivity.this);
        textView.setLayoutParams(lp);
        // Center the text vertically
        textView.setGravity(Gravity.CENTER_VERTICAL | Gravity.LEFT);
        // Set the text starting position
        textView.setPadding(36, 0, 0, 0);
        return textView;
    }

    public View getChildView(int groupPosition, int childPosition, boolean isLastChild,
            View convertView, ViewGroup parent) {
        TextView textView = getGenericView();
        textView.setText(getChild(groupPosition, childPosition).toString());
        return textView;
    }

    public Object getGroup(int groupPosition) {
        return groups[groupPosition];
    }

    public int getGroupCount() {
        return groups.length;
    }

    public long getGroupId(int groupPosition) {
        return groupPosition;
    }

    public View getGroupView(int groupPosition, boolean isExpanded, View convertView,
            ViewGroup parent) {
        TextView textView = getGenericView();
        textView.setText(getGroup(groupPosition).toString());
        return textView;
    }

    public boolean isChildSelectable(int groupPosition, int childPosition) {
        return true;
    }

    public boolean hasStableIds() {
        return true;
    }

  }
 }

Here the above code have children (abc, xyz, ash, anu) items on orderinfomation.but if i click orderinfo means it is expanded and wish to display this singlemenuitem values(payment_method,subtotal,discount).how is to do.please help me.

public class SingleMenuItemActivity  extends Activity {

// XML node keys
static final String KEY_ARTIST = "payment_method";
static final String KEY_SUBTOTAL = "subtotal";
static final String KEY_DISCOUNT = "discount";
    public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.single_list_item);

    // getting intent data
    Intent in = getIntent();

    // Get XML values from previous intent
    String subtotal = in.getStringExtra(KEY_SUBTOTAL);
    String discount = in.getStringExtra(KEY_DISCOUNT);
    String payment_method = in.getStringExtra(KEY_ARTIST);
    TextView lblSub = (TextView) findViewById(R.id.subtotal_label);

    TextView lblPayment = (TextView) findViewById(R.id.payment_label);
    TextView lbldiscount = (TextView) findViewById(R.id.discount_label);
    lblSub.setText(subtotal);
    lbldiscount.setText(discount);
    lblPayment.setText(payment_method);
     }
       } 

Answer 1

Here you go with create xml file with ExpandableListView and get the referece on you activity.Create an adapter like below.From activity you set your items as follows

           Map<String, List<CommonTask>> map = new HashMap<String, List<CommonTask>>();

    List<CommonTask> childItem1 = new ArrayList<CommonTask>();
    childItem1.add(new CommonTask("Child 1"));


    List<CommonTask> childItem2 = new ArrayList<CommonTask>();
         childItem2.add(new CommonTask("Child 2"));

            map.put("Parent 1", childItem1);
    map.put("Parent 2", childItem2);

          // Set on listview ExpandableListView reference

           expandListView.setAdapter(adapter);

public class ExpandableListViewAdapter extends BaseExpandableListAdapter {

private static final class ViewHolder {
    TextView textLabel;
    TextView groupTextLabel;

}

private final Map.Entry<Object, List<Object>> entries[];

private final LayoutInflater inflater;


public ExpandableListViewAdapter(final Context theContext,
        final Map<String, List<CommonTask>> map) {
    inflater = LayoutInflater.from(theContext);

    entries = map.entrySet().toArray(new Map.Entry[0]);

}

@Override
public Object getChild(final int groupPosition, final int childPosition) {
    final List<Object> childList = entries[groupPosition].getValue();

    return childList.get(childPosition);
}

@Override
public long getChildId(final int groupPosition, final int childPosition) {
    return childPosition;
}

@Override
public int getChildrenCount(final int groupPosition) {

    final List<Object> childList = entries[groupPosition].getValue();

    final int childCount = childList.size();

    return childCount;
}

@Override
public View getChildView(final int groupPosition, final int childPosition,
        final boolean isLastChild, final View theConvertView,
        final ViewGroup parent) {
    View resultView = theConvertView;

    ViewHolder holder = null;

    if (resultView == null) {
        resultView = inflater.inflate(R.layout.child_layout, null);

        holder = new ViewHolder();

        holder.textLabel = (TextView) resultView.findViewById(R.id.title);

        resultView.setTag(holder);
    } else {
        holder = (ViewHolder) resultView.getTag();
    }

    final Object item = getChild(groupPosition, childPosition);
    CommonTask commonTask = (CommonTask) item;
    holder.textLabel.setText(commonTask.getName());

    return resultView;
}

@Override
public Object getGroup(final int groupPosition) {
    return entries[groupPosition].getKey();
}

@Override
public int getGroupCount() {
    final int groupCount = entries.length;

    return groupCount;
}

@Override
public long getGroupId(final int groupPosition) {
    return groupPosition;
}

@Override
public View getGroupView(final int groupPosition, final boolean isExpanded,
        final View theConvertView, final ViewGroup parent) {
    View resultView = theConvertView;

    ViewHolder holder = null;

    if (resultView == null) {
        resultView = inflater.inflate(R.layout.group_layout, null);

        holder = new ViewHolder();
        holder.groupTextLabel = (TextView) resultView
                .findViewById(R.id.tvGroup);

        resultView.setTag(holder);
    } else {
        holder = (ViewHolder) resultView.getTag();
    }

    final Object item = getGroup(groupPosition);

    holder.groupTextLabel.setText(item.toString());

    return resultView;
}

@Override
public boolean hasStableIds() {
    return true;
}

@Override
public boolean isChildSelectable(final int groupPosition,
        final int childPosition) {
    return true;
}

}