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Android example source code file (ExpandableList2.java)

This example Android source code file (ExpandableList2.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Android by Example" TM.

Java - Android tags/keywords

android, content, context, cursor, expandablelist2, expandablelistactivity, myexpandablelistadapter, name, net, network, number, override, simplecursortreeadapter, string, ui, uri, widget

The ExpandableList2.java Android example source code

/*
 * Copyright (C) 2007 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.example.android.apis.view;

import android.app.ExpandableListActivity;
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.widget.ExpandableListAdapter;
import android.widget.SimpleCursorTreeAdapter;


/**
 * Demonstrates expandable lists backed by Cursors
 */
public class ExpandableList2 extends ExpandableListActivity {
    private int mGroupIdColumnIndex; 
    
    private String mPhoneNumberProjection[] = new String[] {
            People.Phones._ID, People.Phones.NUMBER
    };

    
    private ExpandableListAdapter mAdapter;
    

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

        // Query for people
        Cursor groupCursor = managedQuery(People.CONTENT_URI,
                new String[] {People._ID, People.NAME}, null, null, null);

        // Cache the ID column index
        mGroupIdColumnIndex = groupCursor.getColumnIndexOrThrow(People._ID);

        // Set up our adapter
        mAdapter = new MyExpandableListAdapter(groupCursor,
                this,
                android.R.layout.simple_expandable_list_item_1,
                android.R.layout.simple_expandable_list_item_1,
                new String[] {People.NAME}, // Name for group layouts
                new int[] {android.R.id.text1},
                new String[] {People.NUMBER}, // Number for child layouts
                new int[] {android.R.id.text1});
        setListAdapter(mAdapter);
    }

    public class MyExpandableListAdapter extends SimpleCursorTreeAdapter {

        public MyExpandableListAdapter(Cursor cursor, Context context, int groupLayout,
                int childLayout, String[] groupFrom, int[] groupTo, String[] childrenFrom,
                int[] childrenTo) {
            super(context, cursor, groupLayout, groupFrom, groupTo, childLayout, childrenFrom,
                    childrenTo);
        }

        @Override
        protected Cursor getChildrenCursor(Cursor groupCursor) {
            // Given the group, we return a cursor for all the children within that group 

            // Return a cursor that points to this contact's phone numbers
            Uri.Builder builder = People.CONTENT_URI.buildUpon();
            ContentUris.appendId(builder, groupCursor.getLong(mGroupIdColumnIndex));
            builder.appendEncodedPath(People.Phones.CONTENT_DIRECTORY);
            Uri phoneNumbersUri = builder.build();

            // The returned Cursor MUST be managed by us, so we use Activity's helper
            // functionality to manage it for us.
            return managedQuery(phoneNumbersUri, mPhoneNumberProjection, null, null, null);
        }

    }
}

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