Android Open Source - Music-Share-Android Music List Adapter

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Back to project page Music-Share-Android.

License

The source code is released under:

GNU General Public License

Java Source Code

package com.paperairplane.music.share;
// w w w. j  a  v a2  s. c  om
import java.util.Arrays;
import java.util.Comparator;
import java.util.HashMap;

import android.content.Context;
import android.content.SharedPreferences;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.SectionIndexer;
import android.widget.TextView;

import com.paperairplane.music.share.R;
import com.paperairplane.music.share.cache.ImageLoader;

/**
 * ?????????ListView?Adapater
 * 
 * @author Harry Chen (<a href="mailto:chenshengqi1@gmail.com">Harry Chen</a>)
 * @author Xavier Yao (<a href="mailto:xavieryao@me.com">Xavier Yao</a>)
 * @see <a
 *      href="http://www.github.com/PaperAirPlane-Dev-Team/Music-Share-Android">Our
 *      GitHub</a>
 */
public class MusicListAdapter extends BaseAdapter implements SectionIndexer {
  private Context mContext;
  private MusicData mMusicDatas[];
  private HashMap<Character, Integer> mSectionMap;
  private Character[] mSectionCharArr;
  private boolean mIsTextColorSet, mHasUnknownChar;
  private int mTextColor;
  private ImageLoader mImageLoader;
  
  /**
   * ????
   * 
   * @param context
   *            App???
   * @param musicdatas
   *            ???????????????
   */
  public MusicListAdapter(Context context, MusicData musicdatas[]) {
    mContext = context;
    mMusicDatas = musicdatas;// ????Cursor?
    mImageLoader = new ImageLoader(mContext, mMusicDatas);
    Arrays.sort(mMusicDatas, new Comparator<MusicData>() {
      @Override
      public int compare(MusicData lhs, MusicData rhs) {
        return lhs.compareTo(rhs);
      }
    });
    int length = mMusicDatas.length;
    mSectionMap = new HashMap<Character, Integer>();
    char charTemp = 0, charNow;// ??????????????
    for (int i = length - 1; i >= 0; i--) {
      charNow = mMusicDatas[i].getFirstChar();
      if (charTemp == charNow) {
        mSectionMap.remove(charTemp);
      }
      charTemp = mMusicDatas[i].getFirstChar();
      mSectionMap.put(charTemp, i);
      /*
       * ???????,???????,????????,??????????????????????? ????????????
       */
    }
    if (mMusicDatas[mMusicDatas.length - 1].getFirstChar() == Consts.UNKNOWN_CHAR) {
      mHasUnknownChar = true;
    }
    mIsTextColorSet = false;
    SharedPreferences preference = mContext.getSharedPreferences(
        Consts.Preferences.GENERAL, Context.MODE_PRIVATE);
    String color=preference
        .getString(Consts.Preferences.TEXT_COLOR, "");
    if (!color.equals("")) {
      mTextColor = android.graphics.Color.parseColor(color);
      mIsTextColorSet = true;
    }
  }
  
  public int getCount() {
    // if (mMusicDatas != null) {
    return mMusicDatas.length;
    // }
    // return 0;
  }

  public Object getItem(int position) {
    return mMusicDatas[position];
  }

  public long getItemId(int position) {
    return position;
  }

  public View getView(int position, View convertView, ViewGroup parent) {
    ViewHolder holder = null;//?????????????????????
    if (convertView == null) {
      convertView = LayoutInflater.from(mContext).inflate(
          R.layout.musiclist_item, null);
      holder = new ViewHolder();
      holder.tvTitle = (TextView) convertView
          .findViewById(R.id.musicname);
      holder.tvArtist = (TextView) convertView.findViewById(R.id.singer);
      holder.ivArtwork = (ImageView) convertView.findViewById(R.id.imageView1);
      
      convertView.setTag(holder);
    } else {
      holder = (ViewHolder) convertView.getTag();
    }
    holder.tvTitle.setText(mMusicDatas[position].getTitle());
    holder.tvArtist.setText(mMusicDatas[position].getArtist());
    holder.ivArtwork.setImageResource(R.drawable.albumart_mp_unknown_list);
    
    mImageLoader.DisplayImage(
        "" + mMusicDatas[position].getAlbumId(),
        holder.ivArtwork,
        false);
    
    if (mIsTextColorSet) {
      holder.tvArtist.setTextColor(mTextColor);
      holder.tvTitle.setTextColor(mTextColor);
    }
    return convertView;
  }

  private static class ViewHolder {
    TextView tvTitle;
    TextView tvArtist;
    ImageView ivArtwork;
  }

  @Override
  public int getPositionForSection(int section) {
    char sectionChar = mSectionCharArr[section];
    if (mHasUnknownChar && section == mSectionMap.size() - 1)
      // ????????
      sectionChar = Consts.UNKNOWN_CHAR;
    int position = mSectionMap.get(sectionChar);
    return position;
  }

  @Override
  public int getSectionForPosition(int position) {
    int section = 0;
    char charNow = mMusicDatas[position].getFirstChar();
    for (char charTemp : mSectionCharArr) {
      if (charNow != charTemp) {
        section++;
        continue;
      }
      if (charNow == charTemp) {
        break;
      }
    }
    if (charNow == Consts.UNKNOWN_CHAR) {
      // ??????????, ?????????????????????????
      return mSectionMap.size() - 1;
    }
    return section;
  }

  @Override
  public Object[] getSections() {
    // char[] s = "ABCDEFGHIJKLMNOPQRSTUVWXYZ#".toCharArray();
    int arraySize = mSectionMap.size();
    mSectionCharArr = new Character[arraySize];
    mSectionCharArr = mSectionMap.keySet().toArray(mSectionCharArr);
    
    // Sort
    for (int i = 0; i < arraySize; i++) {
      for (int j = 0; j < arraySize; j++) {
        if (mSectionCharArr[i].charValue() < mSectionCharArr[j].charValue()) {
          Character c = mSectionCharArr[i];
          mSectionCharArr[i] = mSectionCharArr[j];
          mSectionCharArr[j] = c;
        }
      }
    }

    /*
     * ????????????????????ArrayIndexOutOfBound???? ?????????, ??????????????-1,
     * ???arraySize?0 ???????????,??????????
     */
    return mSectionCharArr;
  }

}

Java Source Code List

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