以字母格式对来自 phone 存储的数据进行排序？

Question

我是 android.I 的初学者，我正在尝试从存储中获取音频文件并将其放入回收站 view.And 它可以完美加载，但是，我不知道我该怎么做按文件名 的字母顺序对整个列表进行排序。我尝试了一些方法，但没有奏效。请帮我解决this.Thank你

这是我的 Java 文件： Recycler_MusicPlayer.java:

 public class Recycler_MusicPlayer extends Recycler_Music_Player_onclick {
        // private RecyclerView recyclerView;
        Adapter adapter;
        Cursor musiccursor;
        int music_column_index;
        int count;
        FastScrollRecyclerView recyclerView;

        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.recycler__music_player);
            setTitle("List of Songs");
            recyclerView = (FastScrollRecyclerView) findViewById(R.id.recycler);
            recyclerView.setLayoutManager(new LinearLayoutManager(this));

            System.gc();
            String[] proj = {MediaStore.Audio.Media._ID,
                    MediaStore.Audio.Media.DATA,
                    MediaStore.Audio.Media.DISPLAY_NAME,
                    MediaStore.Video.Media.SIZE};
            musiccursor = managedQuery(MediaStore.Audio.Media.EXTERNAL_CONTENT_URI,
                    proj, null, null, null);
            count = musiccursor.getCount();
            adapter = new Adapter(this);
            recyclerView.setAdapter(adapter);

        }


        public class Adapter extends RecyclerView.Adapter<Adapter.MyViewHolder> {

            private Context mContext;
            private LayoutInflater inflater;

            public Adapter(Recycler_MusicPlayer recycler_musicPlayer) {
                inflater = LayoutInflater.from(recycler_musicPlayer);
                mContext = recycler_musicPlayer;
            }

            @Override
            public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
                View view = inflater.inflate(R.layout.song_layout, parent, false);
                return new MyViewHolder(view);

            }

            @Override
            public void onBindViewHolder(MyViewHolder holder, int position) {
                System.gc();
                String id = null;
                music_column_index = musiccursor
                        .getColumnIndexOrThrow(MediaStore.Audio.Media.DISPLAY_NAME);
                musiccursor.moveToPosition(position);
                id = musiccursor.getString(music_column_index);
                music_column_index = musiccursor
                        .getColumnIndexOrThrow(MediaStore.Audio.Media.SIZE);
                musiccursor.moveToPosition(position);
                id += " Size(KB):" + musiccursor.getString(music_column_index);
                holder.song.setText(id);
            }

            @Override
            public int getItemCount() {
                return count;
            }

            public class MyViewHolder extends RecyclerView.ViewHolder {
                TextView song;
                ImageView play;

                public MyViewHolder(View itemView) {
                    super(itemView);
                    song = (TextView) itemView.findViewById(R.id.song);
                    play = (ImageView) itemView.findViewById(R.id.play);
                    itemView.setOnClickListener(new View.OnClickListener() {

                        @Override
                        public void onClick(View v) {
                            if (mMediaPlayer.isPlaying()) {
                                Log.e("zzzzzzzzzzzz", "is playingggg");
                                mMediaPlayer.pause();
                                pause = 0;
                            }
                            Log.e("ddddddddddd", "after set play on click");
                            int pos = getAdapterPosition();
                            startActivity(new Intent(v.getContext(), Recycler_Music_Player_onclick.class)
                                    .putExtra("pos", pos));
                        }


                    });
                }
            }
        }

    }

Answer 1

您需要在管理查询中对记录进行排序尝试以下更改

您可以按升序降序管理顺序

升序

String sortOrder = MediaStore.Audio.Media.DISPLAY_NAME+ " ASC";

降序

String sortOrder = MediaStore.Audio.Media.DISPLAY_NAME+ " DESC";

管理查询更改

musiccursor = managedQuery(MediaStore.Audio.Media.EXTERNAL_CONTENT_URI,proj, null, null, sortOrder);

以字母格式对来自 phone 存储的数据进行排序？

Sort data coming from phone storage in alphabetical format?

android

adapter

android-recyclerview

android-storage