[android-developers] CursorTreeAdapter!!!

[beginner]

Hello everyone!!!
I'm new android, i'm trying to do with CursorTreeAdapter but it doesnt
work. Please help!!!

Here is my code

import android.app.Activity;

import android.content.ContentUris;
import android.content.Context;
import android.database.Cursor;
import android.net.Uri;
import android.os.Bundle;
import android.provider.Contacts.People;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.CursorTreeAdapter;
import android.widget.ExpandableListAdapter;
import android.widget.ExpandableListView;
import android.widget.TextView;


public class ExpandableList extends Activity {
        private int mGroupIdColumnIndex;

    private String mPhoneNumberProjection[] = new String[] {
            People.Phones._ID, People.Phones.NUMBER
    };


    private ExpandableListAdapter mAdapter;
    private LayoutInflater mInflater;
    private LayoutInflater mInflater_group;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.expandable_list);
        Cursor groupCursor = managedQuery(People.CONTENT_URI,
                new String[] {People._ID, People.NAME},
null,null,null);
        mGroupIdColumnIndex =
groupCursor.getColumnIndexOrThrow(People._ID);
        ExpandableListView lv = (ExpandableListView)
this.findViewById(R.id.expandable_list);

        MyExpandableListAdapter myAdapter = new
MyExpandableListAdapter(groupCursor,this);
        lv.setAdapter(myAdapter);

    }

    public class MyExpandableListAdapter extends CursorTreeAdapter {

        public MyExpandableListAdapter(Cursor cursor, Context context)
{
            super(cursor,context);
        }

        @Override
        protected Cursor getChildrenCursor(Cursor groupCursor) {
            Uri.Builder builder = People.CONTENT_URI.buildUpon();
            ContentUris.appendId(builder,
groupCursor.getLong(mGroupIdColumnIndex));
 
builder.appendEncodedPath(People.Phones.CONTENT_DIRECTORY);
            Uri phoneNumbersUri = builder.build();
            return managedQuery(phoneNumbersUri,
mPhoneNumberProjection, null, null, null);
        }

                @Override
                protected void bindChildView(View view, Context context, Cursor
cursor,
                                boolean isLastChild) {
                        TextView id = (TextView) view.findViewById(R.id.text1);
                id.setText(People.NUMBER);

                }

                @Override
                protected void bindGroupView(View view, Context context, Cursor
cursor,
                                boolean isExpanded) {
                TextView id = (TextView) view.findViewById(R.id.text1);
                id.setText(People.NAME);


                }

                @Override
                protected View newChildView(Context context, Cursor cursor,
                                boolean isLastChild, ViewGroup parent) {
                        mInflater = LayoutInflater.from(context);
                final View view =
mInflater.inflate(R.layout.expandable_list_item_with_image, parent,
false);
                return view;
                }

                @Override
                protected View newGroupView(Context context, Cursor cursor,
                                boolean isExpanded, ViewGroup parent) {
                        mInflater_group = LayoutInflater.from(context);
                final View view =
mInflater_group.inflate(R.layout.expandable_list, parent, false);
                return view;
                }

    }

}

Here is my expandable_list.xml file

<?xml version="1.0" encoding="UTF-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/
android"
         android:orientation="vertical"
         android:layout_width="fill_parent"
         android:layout_height="fill_parent">
     <ExpandableListView
        android:id="@+id/expandable_list"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:layout_weight="1"/>
         <TextView
        android:id="@+id/text1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="right" />

 </LinearLayout>

Here is my expandable_list_item_with_image.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android";
    android:layout_width="fill_parent"
    android:layout_height="fill_parent">

        <LinearLayout

        android:layout_width="fill_parent"
        android:layout_height="wrap_content">


    <TextView
        android:id="@+id/text1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="right" />
        <ImageView
                        android:id="@+id/icon"
                        android:layout_width="35px"
                        android:paddingLeft="2px"
                        android:paddingRight="10px"
                        android:paddingTop="2px"
                        android:layout_height="30px"
                        android:src="@drawable/icon"/>

</LinearLayout>
</RelativeLayout>

Thanks in advance

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