Java tutorial
/* * Copyright (C) 2014 Saravan Pantham * * 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.aniruddhc.acemusic.player.MusicLibraryEditorActivity; import android.content.Context; import android.database.Cursor; import android.graphics.Paint; import android.os.AsyncTask; import android.support.v4.widget.SimpleCursorAdapter; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.CheckBox; import android.widget.CompoundButton; import android.widget.CompoundButton.OnCheckedChangeListener; import android.widget.ImageView; import android.widget.TextView; import com.aniruddhc.acemusic.player.R; import com.aniruddhc.acemusic.player.DBHelpers.DBAccessHelper; import com.aniruddhc.acemusic.player.Helpers.TypefaceHelper; import com.aniruddhc.acemusic.player.Utils.Common; public class MusicLibraryEditorAlbumsMultiselectAdapter extends SimpleCursorAdapter { private Context mContext; private Common mApp; public MusicLibraryEditorAlbumsMultiselectAdapter(Context context, Cursor cursor) { super(context, -1, cursor, new String[] {}, new int[] {}, 0); mContext = context; mApp = (Common) mContext.getApplicationContext(); } @Override public View getView(int position, View convertView, ViewGroup parent) { final Cursor c = (Cursor) getItem(position); SongsListViewHolder holder = null; if (convertView == null) { convertView = LayoutInflater.from(mContext).inflate(R.layout.music_library_editor_albums_layout, parent, false); holder = new SongsListViewHolder(); holder.image = (ImageView) convertView.findViewById(R.id.albumThumbnailMusicLibraryEditor); holder.title = (TextView) convertView.findViewById(R.id.albumNameMusicLibraryEditor); holder.checkBox = (CheckBox) convertView.findViewById(R.id.albumCheckboxMusicLibraryEditor); holder.subText = (TextView) convertView.findViewById(R.id.albumArtistNameMusicLibraryEditor); convertView.setTag(holder); } else { holder = (SongsListViewHolder) convertView.getTag(); } final View finalConvertView = convertView; final String songId = c.getString(c.getColumnIndex(DBAccessHelper._ID)); final String songArtist = c.getString(c.getColumnIndex(DBAccessHelper.SONG_ARTIST)); final String songAlbum = c.getString(c.getColumnIndex(DBAccessHelper.SONG_ALBUM)); final String songAlbumArtPath = c.getString(c.getColumnIndex(DBAccessHelper.SONG_ALBUM_ART_PATH)); //Set the album's name and artist as the row's tag. convertView.setTag(R.string.album, songAlbum); convertView.setTag(R.string.artist, songArtist); holder.title.setTypeface(TypefaceHelper.getTypeface(mContext, "RobotoCondensed-Light")); holder.title.setPaintFlags(holder.title.getPaintFlags() | Paint.SUBPIXEL_TEXT_FLAG | Paint.ANTI_ALIAS_FLAG); holder.subText.setTypeface(TypefaceHelper.getTypeface(mContext, "RobotoCondensed-Light")); holder.subText .setPaintFlags(holder.subText.getPaintFlags() | Paint.SUBPIXEL_TEXT_FLAG | Paint.ANTI_ALIAS_FLAG); //Set the song title. holder.title.setText(songAlbum); holder.subText.setText(songArtist); mApp.getImageLoader().displayImage(songAlbumArtPath, holder.image, MusicLibraryEditorActivity.displayImageOptions); //Check if the song's DB ID exists in the HashSet and set the appropriate checkbox status. if (MusicLibraryEditorActivity.songDBIdsList.contains(songId)) { holder.checkBox.setChecked(true); convertView.setBackgroundColor(0xCC0099CC); } else { convertView.setBackgroundColor(0x00000000); holder.checkBox.setChecked(false); } holder.checkBox.setOnCheckedChangeListener(new OnCheckedChangeListener() { @Override public void onCheckedChanged(CompoundButton checkbox, boolean isChecked) { if (isChecked == true) { //Only receive inputs by the user and ignore any system-made changes to the checkbox state. if (checkbox.isPressed()) { finalConvertView.setBackgroundColor(0xCC0099CC); AsyncGetAlbumSongIds task = new AsyncGetAlbumSongIds(songAlbum, songArtist); task.execute(new String[] { "ADD" }); } } else if (isChecked == false) { //Only receive inputs by the user and ignore any system-made changes to the checkbox state. if (checkbox.isPressed()) { finalConvertView.setBackgroundColor(0x00000000); AsyncGetAlbumSongIds task = new AsyncGetAlbumSongIds(songAlbum, songArtist); task.execute(new String[] { "REMOVE" }); } } } }); return convertView; } static class SongsListViewHolder { public ImageView image; public TextView title; public TextView subText; public CheckBox checkBox; } /*************************************************************** * This AsyncTask goes through a specified album and retrieves * every song in the album and its ID. It then inserts the ID(s) * into a HashSet. ***************************************************************/ static class AsyncGetAlbumSongIds extends AsyncTask<String, String, String> { private String mAlbumName; private String mArtistName; public AsyncGetAlbumSongIds(String albumName, String artistName) { mAlbumName = albumName; mArtistName = artistName; } @Override protected String doInBackground(String... params) { //Check if the user is adding or removing an album from the list. String operation = params[0]; if (operation.equals("ADD")) { addAlbumToLibrary(); } else { removeAlbumFromLibrary(); } return null; } public void addAlbumToLibrary() { Cursor cursor = MusicLibraryEditorActivity.dbHelper.getAllSongsInAlbum(mAlbumName, mArtistName); if (cursor != null && cursor.getCount() > 0) { for (int i = 0; i < cursor.getCount(); i++) { cursor.moveToPosition(i); MusicLibraryEditorActivity.songDBIdsList .add(cursor.getString(cursor.getColumnIndex(DBAccessHelper._ID))); } cursor.close(); cursor = null; } } public void removeAlbumFromLibrary() { Cursor cursor = MusicLibraryEditorActivity.dbHelper.getAllSongsInAlbum(mAlbumName, mArtistName); if (cursor != null && cursor.getCount() > 0) { for (int i = 0; i < cursor.getCount(); i++) { cursor.moveToPosition(i); MusicLibraryEditorActivity.songDBIdsList .remove(cursor.getString(cursor.getColumnIndex(DBAccessHelper._ID))); } cursor.close(); cursor = null; } } } }