delete query Track, write play list : MediaStore « Media « Android

1. Android
2. Media
3. MediaStore

delete query Track, write play list

    
//package com.andrewchatham.pony;

import java.util.ArrayList;

import android.content.ContentResolver;
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.net.Uri;
import android.provider.MediaStore;
import android.util.Log;

// Large parts of this file are cribbed from MusicUtil.java in the android music player.

public class MediaUtil {
  public static final String TAG = "MediaUtil";

  public static void deleteTrack(Context context, String localPath) {
    Uri uri = MediaStore.Audio.Media.getContentUriForPath(localPath);
    context.getContentResolver().delete(uri, null, null);
  }

  public static Cursor query(Context context, Uri uri, String[] projection,
      String selection, String[] selectionArgs, String sortOrder, int limit) {
    try {
      ContentResolver resolver = context.getContentResolver();
      if (resolver == null) {
        return null;
      }
      if (limit > 0) {
        uri = uri.buildUpon().appendQueryParameter("limit", "" + limit).build();
      }
      return resolver.query(uri, projection, selection, selectionArgs, sortOrder);
    } catch (UnsupportedOperationException ex) {
      return null;
    }
  }

  public static Cursor query(Context context, Uri uri, String[] projection,
      String selection, String[] selectionArgs, String sortOrder) {
    return query(context, uri, projection, selection, selectionArgs, sortOrder, 0);
  }

  private static int intFromCursor(Cursor c) {
    int id = -1;
    if (c != null) {
      c.moveToFirst();
      if (!c.isAfterLast()) {
        id = c.getInt(0);
      }
    }
    c.close();
    return id;
  }

  public static int idForplaylist(Context context, String name) {
    Cursor c = query(context, MediaStore.Audio.Playlists.EXTERNAL_CONTENT_URI,
        new String[] { MediaStore.Audio.Playlists._ID },
        MediaStore.Audio.Playlists.NAME + "=?",
        new String[] { name },
        MediaStore.Audio.Playlists.NAME);
    return intFromCursor(c);
  }

  public static int idFortrack(Context context, String path) {
    Cursor c = query(context, MediaStore.Audio.Playlists.EXTERNAL_CONTENT_URI,
        new String[] { MediaStore.Audio.Media._ID },
        MediaStore.Audio.Media.DATA + "=?",
        new String[] { path },
        MediaStore.Audio.Media.DATA);
    return intFromCursor(c);
  }

  public static void writePlaylist(Context context, String playlistName, ArrayList<String> paths) {
    ContentResolver resolver = context.getContentResolver();
    int playlistId = idForplaylist(context, playlistName);
    Uri uri;
    if (playlistId == -1) { 
      ContentValues values = new ContentValues(1);
      values.put(MediaStore.Audio.Playlists.NAME, playlistName);
      uri = resolver.insert(MediaStore.Audio.Playlists.EXTERNAL_CONTENT_URI, values);
      playlistId = idForplaylist(context, playlistName);
    } else {
      uri = MediaStore.Audio.Playlists.Members.getContentUri("external", playlistId); 
    }
    Log.d(TAG, String.format("Writing playlist %s", uri));
    
    // Delete everything from the old playlist
    context.getContentResolver().delete(uri, null, null);

    // Add all the new tracks to the playlist.
    int size = paths.size();
    ContentValues values [] = new ContentValues[size];
    for (int k = 0; k < size; ++k) {
      values[k] = new ContentValues();
      values[k].put(MediaStore.Audio.Playlists.Members.PLAY_ORDER, k);
      values[k].put(MediaStore.Audio.Playlists.Members.AUDIO_ID, idFortrack(context, paths.get(k)));
    }

    resolver.bulkInsert(uri, values);
  }
}

   
    
    
    
  

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