我正在制作一个有片段的音乐播放器。它有5个片段 - 歌曲，专辑，艺术家，播放列表，流派。 Song.java片段显示来自recyclerVIew的sd卡中的所有歌曲。并且Albums.java显示SD卡中存在的歌曲的专辑封面（在recyclerView中）。我想要的是当我点击其中一个专辑封面时，它应该带我到另一个活动（AlbumsDetails.java），该活动显示该特定专辑中包含的recyclerView中的所有歌曲（就像在音乐播放器中一样）。我将Album ID作为意图从Albums.java传递给AlbumsDetails.java。我尝试了很多方法但没有成功显示点击专辑的歌曲。
Albums.java
import UIKit
import XCPlayground
let path = UIBezierPath()
path.move(to: CGPoint(x:10,y:10))
path.addLine(to: CGPoint(x:290,y:10))
path.lineWidth = 2
let dashPattern : [CGFloat] = [16, 16]
path.setLineDash(dashPattern, count: 2, phase: 0)
path.lineCapStyle = CGLineCap.round
path.lineCapStyle = .butt
let renderer = UIGraphicsImageRenderer(size: CGSize(width: 300, height: 20))
let image = renderer.image { context in
path.stroke()
}
// image now contains an image of the path
AlbumsDetails.java（这是应该显示所点击相册的歌曲的类）：
public class Albums extends Fragment {
private static final String TAG = "Albums";
RecyclerView recyclerViewAlbum;
AlbumsAdapter albumsAdapter;
private ArrayList<SongInfoModel> SongList1 = new ArrayList<SongInfoModel>();
long albumId;
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.albums_activity, container, false);
recyclerViewAlbum = view.findViewById(R.id.albums_reyclerView);
recyclerViewAlbum.setHasFixedSize(true);
GridLayoutManager gridLayoutManager = new GridLayoutManager(getContext(),2);
recyclerViewAlbum.setLayoutManager(gridLayoutManager);
Uri uri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;
String selection = MediaStore.Audio.Media.IS_MUSIC + "!=0";
Cursor cursor = getActivity().getContentResolver().query(uri, null, selection, null, null);
if (cursor != null) {
if (cursor.moveToFirst()) {
do {
String name = cursor.getString(cursor.getColumnIndex(MediaStore.Audio.Media.TITLE));
String artist = cursor.getString(cursor.getColumnIndex(MediaStore.Audio.Media.ARTIST));
long duration = cursor.getLong(cursor.getColumnIndex(MediaStore.Audio.Media.DURATION));
String album = cursor.getString(cursor.getColumnIndex(MediaStore.Audio.Media.ALBUM));
String data = cursor.getString(cursor.getColumnIndex(MediaStore.Audio.Media.DATA));
long albumId = cursor.getLong(cursor.getColumnIndex(MediaStore.Audio.Media.ALBUM_ID));
Uri sArtworkUri = Uri.parse("content://media/external/audio/albumart");
Uri albumArtUri = ContentUris.withAppendedId(sArtworkUri, albumId);
SongInfoModel s = new SongInfoModel(name, artist, null, album, null, duration, data,albumArtUri, null);
SongList1.add(s);
} while (cursor.moveToNext());
}
cursor.close();
Collections.sort(SongList1, new Comparator<SongInfoModel>() {
@Override
public int compare(SongInfoModel lhs, SongInfoModel rhs) {
return lhs.getAlbum().compareTo(rhs.getAlbum());
}
});
}
albumsAdapter = new AlbumsAdapter( SongList1,getContext(), new AlbumsAdapter.RecyclerItemClickListener() {
@Override
public void onClickListener(SongInfoModel song, int position) {
Intent intent = new Intent(getContext(), AlbumDetails.class);
intent.putExtra("album_id", albumId);
startActivity(intent);
Activity activity = getActivity();
if (activity instanceof MainActivity) {
}
}
});
recyclerViewAlbum.setAdapter(albumsAdapter);
albumsAdapter.notifyDataSetChanged();
return view;
}
AlbumsDetailsAdapter.java（AlbumsDetails.java的适配器类）：
public class AlbumDetails extends Activity {
RecyclerView albumsDetails_reyclerView;
AlbumsDetailsAdapter albumsDetailsAdapter;
private ArrayList<SongInfoModel> SongList2 = new ArrayList<SongInfoModel>();
long albumId;
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.album_details);
albumsDetails_reyclerView = findViewById(R.id.albumsDetails_reyclerView);
LinearLayoutManager linearLayoutManager = new LinearLayoutManager(getApplicationContext());
albumsDetails_reyclerView.setLayoutManager(linearLayoutManager);
Bundle extras = getIntent().getExtras();
if(extras != null){
albumId = getIntent().getExtras().getLong("album_id");
}
albumsDetailsAdapter = new AlbumsDetailsAdapter(getApplicationContext(), SongList2, new AlbumsDetailsAdapter.RecyclerItemClickListenerAlbumsDetails() {
@Override
public void onClickListener(SongInfoModel songInfoModelAlbumDetails, int positionAlbumDetails) {
}
}){
};
albumsDetails_reyclerView.setAdapter(albumsDetailsAdapter);
albumsDetailsAdapter.notifyDataSetChanged();
}
}
SongInfoModel.java（Model class）：
public class AlbumsDetailsAdapter extends RecyclerView.Adapter<AlbumsDetailsAdapter.AlbumsDetailsHolder> {
Context context;
ArrayList<SongInfoModel> SongListAlbumDetails = new ArrayList<>();
private RecyclerItemClickListenerAlbumsDetails listenerAlbumDetails;
public AlbumsDetailsAdapter(Context context, ArrayList<SongInfoModel> songListAlbumDetails, RecyclerItemClickListenerAlbumsDetails listenerAlbumDetails) {
this.context = context;
SongListAlbumDetails = songListAlbumDetails;
this.listenerAlbumDetails = listenerAlbumDetails;
}
@Override
public AlbumsDetailsAdapter.AlbumsDetailsHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater.from(context).inflate(R.layout.row_albumdetails, parent, false);
return new AlbumsDetailsHolder(view);
}
@Override
public void onBindViewHolder(AlbumsDetailsAdapter.AlbumsDetailsHolder holder, int position) {
final SongInfoModel songInfoModelAlbumDetails = SongListAlbumDetails.get(position);
holder.AlbumSongName.setText(songInfoModelAlbumDetails.getSongName());
holder.bindAlbumsDetails(songInfoModelAlbumDetails, listenerAlbumDetails);
}
@Override
public int getItemCount() {
return SongListAlbumDetails.size();
}
public class AlbumsDetailsHolder extends RecyclerView.ViewHolder {
TextView AlbumSongName;
public AlbumsDetailsHolder(View itemView) {
super(itemView);
AlbumSongName = itemView.findViewById(R.id.AlbumSongName);
}
public void bindAlbumsDetails(final SongInfoModel songInfoModelAlbumDetails, final RecyclerItemClickListenerAlbumsDetails listenerAlbumDetails) {
itemView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
listenerAlbumDetails.onClickListener(songInfoModelAlbumDetails, getLayoutPosition());
}
});
}
}
public interface RecyclerItemClickListenerAlbumsDetails{
void onClickListener(SongInfoModel songInfoModelAlbumDetails, int positionAlbumDetails);
}