バックグラウンド処理（非同期）ですべてのオーディオファイルを取得するには？

Question

私は次のコードを持っていますが、アプリケーションがクラッシュすることがありますがロードに時間がかかりすぎます。私はバックグラウンドプロセスでやります。私はそれをAsyncTaskを使ってやろうとしましたが、その中に次のコードを置くことができませんでした。膨らんだビュー 'ビュー'はコードのその部分に戻さなければならないことに注意してください。

View view = inflater.inflate(R.layout.activity_second, container, false); 
      ArrayList<Song> songList = new ArrayList<Song>(); 
      final Uri uri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI; 
      final String[] cursor_cols = { MediaStore.Audio.Media._ID, MediaStore.Audio.Media.ARTIST, MediaStore.Audio.Media.ALBUM, MediaStore.Audio.Media.TITLE, MediaStore.Audio.Media.DATA, MediaStore.Audio.Media.ALBUM_ID, MediaStore.Audio.Media.DURATION }; 
      final String where = MediaStore.Audio.Media.IS_MUSIC + "=1"; 
      final Cursor cursor = view.getContext().getContentResolver().query(uri, cursor_cols, where, null, null); 
      while (cursor.moveToNext()) { 
       String artist = cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.ARTIST)); 
       String album = cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.ALBUM)); 
       String track = cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.TITLE)); 
       String data = cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.DATA)); 
       Long albumId = cursor.getLong(cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.ALBUM_ID)); 
       int duration = cursor.getInt(cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.DURATION)); 
       Uri sArtworkUri = Uri.parse("content://media/external/audio/albumart"); 
       Uri albumArtUri = ContentUris.withAppendedId(sArtworkUri, albumId); 
       try { 
        MediaStore.Images.Media.getBitmap(view.getContext().getContentResolver(), albumArtUri); 
       } catch (FileNotFoundException exception) { 
        exception.printStackTrace(); 
        albumArtUri = Uri.parse("Unknown"); 
       } catch (IOException e) { 
        e.printStackTrace(); 
       } 
       Collections.sort(songList, new Comparator<Song>() { 
        public int compare(Song a, Song b) { 
         return a.getTitle().compareTo(b.getTitle()); 
        } 
       }); 
       songList.add(new Song(albumId, track, artist, album, albumArtUri.toString())); 
       RecyclerView recyclerView = (RecyclerView) view.findViewById(R.id.recyclerView); 
       recyclerView.setHasFixedSize(true); 
       recyclerView.setLayoutManager(new GridLayoutManager(view.getContext(),2)); 
       RecyclerViewAdapter recyclerViewAdapter = new RecyclerViewAdapter(view.getContext(), songList); 
       recyclerView.setAdapter(recyclerViewAdapter); 
       registerForContextMenu(recyclerView); 

      } 
      return view; 

Answer 1

あなたは繰り返しループ内RecyclerViewを設定しています！それはまだあまりにも遅いなら、それはビットマップの検索が犯人である可能性が高いですが、

 View view = inflater.inflate(R.layout.activity_second, container, false); 
     ArrayList<Song> songList = new ArrayList<Song>(); 
     final Uri uri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI; 
     final String[] cursor_cols = { MediaStore.Audio.Media._ID, MediaStore.Audio.Media.ARTIST, MediaStore.Audio.Media.ALBUM, MediaStore.Audio.Media.TITLE, MediaStore.Audio.Media.DATA, MediaStore.Audio.Media.ALBUM_ID, MediaStore.Audio.Media.DURATION }; 
     final String where = MediaStore.Audio.Media.IS_MUSIC + "=1"; 
     final Cursor cursor = view.getContext().getContentResolver().query(uri, cursor_cols, where, null, null); 
     while (cursor.moveToNext()) { 
      String artist = cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.ARTIST)); 
      String album = cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.ALBUM)); 
      String track = cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.TITLE)); 
      String data = cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.DATA)); 
      Long albumId = cursor.getLong(cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.ALBUM_ID)); 
      int duration = cursor.getInt(cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.DURATION)); 
      Uri sArtworkUri = Uri.parse("content://media/external/audio/albumart"); 
      Uri albumArtUri = ContentUris.withAppendedId(sArtworkUri, albumId); 
      try { 
       MediaStore.Images.Media.getBitmap(view.getContext().getContentResolver(), albumArtUri); 
      } catch (FileNotFoundException exception) { 
       exception.printStackTrace(); 
       albumArtUri = Uri.parse("Unknown"); 
      } catch (IOException e) { 
       e.printStackTrace(); 
      } 
      Collections.sort(songList, new Comparator<Song>() { 
       public int compare(Song a, Song b) { 
        return a.getTitle().compareTo(b.getTitle()); 
       } 
      }); 
      songList.add(new Song(albumId, track, artist, album, albumArtUri.toString())); 
     } 

     RecyclerView recyclerView = (RecyclerView) view.findViewById(R.id.recyclerView); 
     recyclerView.setHasFixedSize(true); 
     recyclerView.setLayoutManager(new GridLayoutManager(view.getContext(),2)); 
     RecyclerViewAdapter recyclerViewAdapter = new RecyclerViewAdapter(view.getContext(), songList); 
     recyclerView.setAdapter(recyclerViewAdapter); 
     registerForContextMenu(recyclerView); 

     return view; 

：

はこれを試してみてください。 AsyncTaskをその部分だけに置く方法を教えてください。