com.google.android.demos.jamendo.widget.AlbumGalleryAdapter.java Source code

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Here is the source code for com.google.android.demos.jamendo.widget.AlbumGalleryAdapter.java

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/*-
 * Copyright (C) 2010 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.demos.jamendo.widget;

import com.google.android.demos.jamendo.R;
import com.google.android.demos.jamendo.provider.JamendoContract.Albums;
import com.google.android.demos.jamendo.provider.JamendoContract.Artists;
import com.google.android.imageloader.ImageLoader;

import android.content.Context;
import android.database.Cursor;
import android.support.v4.widget.CursorAdapter;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.ImageView;

public class AlbumGalleryAdapter extends CursorAdapter implements AdapterView.OnItemSelectedListener {

    public static final String[] PROJECTION = { Albums._ID, Albums.IMAGE, Artists.NAME, Albums.NAME, Albums.GENRE };

    private static final int COLUMN_ALBUM_IMAGE = 1;

    private static final int COLUMN_ARTIST_NAME = 2;

    private static final int COLUMN_ALBUM_NAME = 3;

    private static final int COLUMN_ALBUM_GENRE = 4;

    private final ImageLoader mImageLoader;

    public AlbumGalleryAdapter(Context context) {
        super(context, null, 0);
        mImageLoader = ImageLoader.get(context);
    }

    @Override
    public View newView(Context context, Cursor cursor, ViewGroup parent) {
        LayoutInflater inflater = LayoutInflater.from(context);
        return inflater.inflate(R.layout.jamendo_gallery_item, parent, false);
    }

    @Override
    public void bindView(View view, Context context, Cursor cursor) {
        ImageView imageView = (ImageView) view.findViewById(android.R.id.icon);
        String url = cursor.getString(COLUMN_ALBUM_IMAGE);
        mImageLoader.bind(this, imageView, url);
    }

    /**
     * {@inheritDoc}
     */
    public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
        mImageLoader.preload(getCursor(), COLUMN_ALBUM_IMAGE, position - 5, position + 5);
    }

    /**
     * {@inheritDoc}
     */
    public void onNothingSelected(AdapterView<?> parent) {
    }

    @Override
    public void notifyDataSetChanged() {
        super.notifyDataSetChanged();

        // Pre-fetch album covers
        Cursor cursor = getCursor();
        mImageLoader.prefetch(cursor, COLUMN_ALBUM_IMAGE);
    }

    private String getString(Object item, int columnIndex) {
        Cursor cursor = getCursor();
        if (item == cursor) {
            return cursor.getString(columnIndex);
        } else {
            return null;
        }
    }

    public String getArtistName(Object item) {
        return getString(item, COLUMN_ARTIST_NAME);
    }

    public String getAlbumName(Object item) {
        return getString(item, COLUMN_ALBUM_NAME);
    }

    public String getAlbumGenre(Object item) {
        return getString(item, COLUMN_ALBUM_GENRE);
    }
}