/*
* Copyright (C) 2011 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.content.Context;
import android.database.DataSetObserver;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
/**
* Adapter used to bind data for the GridView in ImageGrid Activity. This
* Adapter is updated by the ImageManager.
*/
public class ImageAdapter extends BaseAdapter {
/**
* Maintains the state of our data
*/
private final ImageManager mImageManager;
private final Context mContext;
private final MyDataSetObserver mObserver;
/**
* Used by the {@link ImageManager} to report changes in the list back to
* this adapter.
*/
private class MyDataSetObserver extends DataSetObserver {
@Override
public void onChanged() {
notifyDataSetChanged();
}
@Override
public void onInvalidated() {
notifyDataSetInvalidated();
}
}
public ImageAdapter(Context c) {
mImageManager = ImageManager.getInstance(c);
mContext = c;
mObserver = new MyDataSetObserver();
mImageManager.addObserver(mObserver);
}
/**
* Returns the number of images to display
*
* @see android.widget.Adapter#getCount()
*/
public int getCount() {
return mImageManager.size();
}
/**
* Returns the image at a specified position
*
* @see android.widget.Adapter#getItem(int)
*/
public Object getItem(int position) {
return mImageManager.get(position);
}
/**
* Returns the id of an image at a specified position
*
* @see android.widget.Adapter#getItemId(int)
*/
public long getItemId(int position) {
final PanoramioItem panoramioItem = mImageManager.get(position);
return panoramioItem.getId();
}
/**
* Returns a view to display the image at a specified position
*
* @param position The position to display
* @param convertView An existing view that we can reuse. May be null.
* @param parent The parent view that will eventually hold the view we
* return.
* @return A view to display the image at a specified position
*/
public View getView(int position, View convertView, ViewGroup parent) {
View view;
if (convertView == null) {
// Make up a new view
final LayoutInflater inflater = (LayoutInflater) mContext.getSystemService(
Context.LAYOUT_INFLATER_SERVICE);
view = inflater.inflate(R.layout.image_item, null);
} else {
// Use convertView if it is available
view = convertView;
}
final PanoramioItem panoramioItem = mImageManager.get(position);
final ImageView imageView = (ImageView) view.findViewById(R.id.image);
imageView.setImageBitmap(panoramioItem.getBitmap());
return view;
}
}