Android Open Source - Alfred4Android Playlist

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License

The source code is released under:
Apache License
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Java Source Code

package com.toraleap.collimator.ext;
//from ww w  .j a  va 2 s  .c  o  m
import java.util.ArrayList;
import java.util.List;

import android.content.ContentResolver;
import android.content.ContentValues;
import android.database.Cursor;
import android.database.sqlite.SQLiteException;
import android.net.Uri;
import android.provider.MediaStore;
import android.provider.MediaStore.Audio;
import android.util.Log;

/**
 * ??????????????
 * @author    uestc.Mobius <mobius@toraleap.com>
 * @version  2010.1028
 */
public final class Playlist {
  
  private final ContentResolver mResolver;
  private final String[] mItems;
  
  /**
   * ??????????????????????????????
   */
  public Playlist(ContentResolver resolver, String[] items) {
    mResolver = resolver;
    mItems = items;
  }
  
  /**
   * ??????????????????????????????????????????????????????????????????????????????????????
   * @param name  ???????????
   * @return ????????????
   */
  public int createNew(String name) {
    long[] ids = toMediaId();
    if (ids.length == 0) return 0;
    removeIfExist(name);
        ContentValues[] values = new ContentValues[ids.length];
        Uri uri = createPlaylist(name);
        for (int i = 0; i < ids.length; i++) {
            values[i] = new ContentValues();
            values[i].put(MediaStore.Audio.Playlists.Members.PLAY_ORDER, Integer.valueOf(i));
            values[i].put(MediaStore.Audio.Playlists.Members.AUDIO_ID, ids[i]);
        }    
        return mResolver.bulkInsert(uri, values);
  }
  
  /**
   * ???????????????????????????????????
   * @param name  ???????????
   */
  public void removeIfExist(String name) {
        String whereclause = MediaStore.Audio.Playlists.NAME + " == '" + name.replace("'", "''") + "'";
        Cursor cursor = mResolver.query(MediaStore.Audio.Playlists.EXTERNAL_CONTENT_URI,
            new String[] { MediaStore.Audio.Playlists._ID }, whereclause, null, MediaStore.Audio.Playlists.NAME);
        if (cursor != null && cursor.getCount() > 0) {
          cursor.moveToFirst();
            long id = cursor.getLong(0);
            mResolver.delete(MediaStore.Audio.Playlists.EXTERNAL_CONTENT_URI, MediaStore.Audio.Playlists._ID + " == " + id, null);
        }
        if (cursor != null) cursor.close();
  }
  
  public PlaylistPair[] getPlaylists() {
    List<PlaylistPair> list = new ArrayList<PlaylistPair>();
        String[] cols = new String[] {
                MediaStore.Audio.Playlists._ID,
                MediaStore.Audio.Playlists.NAME
        };
        String whereclause = MediaStore.Audio.Playlists.NAME + " != ''";
        Cursor cursor = mResolver.query(MediaStore.Audio.Playlists.EXTERNAL_CONTENT_URI,
            cols, whereclause, null,
            MediaStore.Audio.Playlists.NAME);
        if (cursor != null && cursor.getCount() > 0) {
          cursor.moveToFirst();
            while (! cursor.isAfterLast()) {
                list.add(new PlaylistPair(cursor.getInt(0), cursor.getString(1)));
                cursor.moveToNext();
            }
        }
        if (cursor != null) cursor.close();
        return (PlaylistPair[]) list.toArray();
  }
  
  /**
   * ????????????????????????????????????? URI??
   * @param name  ????????????
   * @return ???????? URI
   */
  private Uri createPlaylist(String name) {
    ContentValues values = new ContentValues();
    values.put(MediaStore.Audio.PlaylistsColumns.NAME, name);
    return mResolver.insert(MediaStore.Audio.Playlists.EXTERNAL_CONTENT_URI, values);
  }
  
  /**
   * ????????????????????????????????????? ID ?????
   * @return ???? ID ????
   */
  private long[] toMediaId() {
    long[] list = new long[mItems.length];
    for (int i = 0; i < list.length; i++) list[i] = -1;
    StringBuffer sb = new StringBuffer();
    for (int i = 0; i < mItems.length; i++) {
      if (i > 0) sb.append(",");
      // Android 2.1 or earlier
      sb.append("'").append(mItems[i].replace("'", "''")).append("',");
      // Android 2.2
      sb.append("'/mnt").append(mItems[i].replace("'", "''")).append("'");
    }
    String where = MediaStore.Audio.AudioColumns.DATA + " IN (" + sb.toString() + ")";
    try {
      Cursor cursor = mResolver.query(
          MediaStore.Audio.Media.EXTERNAL_CONTENT_URI,
          new String[] { Audio.AudioColumns._ID, MediaStore.Audio.AudioColumns.DATA }, 
          where, null, null);
      if (cursor == null) return new long[0];
      for(cursor.moveToFirst(); !cursor.isAfterLast(); cursor.moveToNext()) {
        String data = cursor.getString(1);
        for (int i = 0; i < mItems.length; i++) {
          if (data.endsWith(mItems[i])) {
            list[i] = cursor.getLong(0);
            break;
          }
        }
      }
    }
    catch (SQLiteException e) {
      Log.e("SQL", e.getMessage());
    }
    return shrinkLongArray(list);
  }
  
  /**
   * ?????? long ??????????????????
   * @param source  ????????
   * @return ???????????????
   */
  public long[] shrinkLongArray(long[] source) {
    int count = 0;
    for (int i = 0; i < source.length; i++)
      if (source[i] >= 0) count++;
    long[] result = new long[count];
    count = 0;
    for (int i = 0; i < source.length; i++)
      if (source[i] >= 0) result[count++] = source[i];
    return result;
  }
  
  public class PlaylistPair {
    private long mId;
    private String mName;
    
    public PlaylistPair(int id, String name) {
      mId = id;
      mName = name;
    }
    
    public long getId() { return mId; }
    public String getName() { return mName; }
  }
}
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