Question

我有以下代码但是加载需要太多时间，因为有时应用程序崩溃。我如何在后台处理。我尝试使用AsyncTask，但我无法在其中放入以下代码。请记住，必须在代码的这一部分返回膨胀的View'view'。

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

您正在重复设置} 循环中的RecyclerView ！

试试这个：

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;

如果这仍然太慢，那么位图检索很可能是罪魁祸首。我可以向您展示如何在该部分上放置AsyncTask。

如何在后台进程中获取所有音频文件（异步）？

1 个答案: