Android example source code file (ImageList.java)

This example Android source code file (ImageList.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, app, content, imageadapter, imagelist, imagemanager, intent, layoutinflater, listactivity, listview, mydatasetobserver, os, override, panoramioitem, ui, view

The ImageList.java Android example source code

/*
 * Copyright (C) 2008 Google Inc.
 *
 * 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.google.android.panoramio;

import android.app.ListActivity;
import android.content.Context;
import android.content.Intent;
import android.database.DataSetObserver;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.Window;
import android.widget.ListView;

/**
 * Activity which displays the list of images.
 */
public class ImageList extends ListActivity {
    
    ImageManager mImageManager;
    
    private MyDataSetObserver mObserver = new MyDataSetObserver();

    /**
     * The zoom level the user chose when picking the search area
     */
    private int mZoom;

    /**
     * The latitude of the center of the search area chosen by the user
     */
    private int mLatitudeE6;

    /**
     * The longitude of the center of the search area chosen by the user
     */
    private int mLongitudeE6;

    /**
     * Observer used to turn the progress indicator off when the {@link ImageManager} is
     * done downloading.
     */
    private class MyDataSetObserver extends DataSetObserver {
        @Override
        public void onChanged() {
            if (!mImageManager.isLoading()) {
                getWindow().setFeatureInt(Window.FEATURE_INDETERMINATE_PROGRESS,
                        Window.PROGRESS_VISIBILITY_OFF);
            }
        }

        @Override
        public void onInvalidated() {
        }
    }
    
    @Override
    public void onCreate(Bundle savedInstanceState) {
        requestWindowFeature(Window.FEATURE_INDETERMINATE_PROGRESS);
        super.onCreate(savedInstanceState);
        mImageManager = ImageManager.getInstance(this);
        ListView listView = getListView();
        LayoutInflater inflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        View footer = inflater.inflate(R.layout.list_footer, listView, false);
        listView.addFooterView(footer, null, false);
        setListAdapter(new ImageAdapter(this));

        // Theme.Light sets a background on our list.
        listView.setBackgroundDrawable(null);
        if (mImageManager.isLoading()) {
            getWindow().setFeatureInt(Window.FEATURE_INDETERMINATE_PROGRESS,
                    Window.PROGRESS_VISIBILITY_ON);
            mImageManager.addObserver(mObserver);
        }
        
        // Read the user's search area from the intent
        Intent i = getIntent();
        mZoom = i.getIntExtra(ImageManager.ZOOM_EXTRA, Integer.MIN_VALUE);
        mLatitudeE6 = i.getIntExtra(ImageManager.LATITUDE_E6_EXTRA, Integer.MIN_VALUE);
        mLongitudeE6 = i.getIntExtra(ImageManager.LONGITUDE_E6_EXTRA, Integer.MIN_VALUE);
    }

    @Override
    protected void onListItemClick(ListView l, View v, int position, long id) {
        PanoramioItem item = mImageManager.get(position);   
        
        // Create an intent to show a particular item.
        // Pass the user's search area along so the next activity can use it
        Intent i = new Intent(this, ViewImage.class);
        i.putExtra(ImageManager.PANORAMIO_ITEM_EXTRA, item);
        i.putExtra(ImageManager.ZOOM_EXTRA, mZoom);
        i.putExtra(ImageManager.LATITUDE_E6_EXTRA, mLatitudeE6);
        i.putExtra(ImageManager.LONGITUDE_E6_EXTRA, mLongitudeE6);
        startActivity(i);
    }   
    
    
}