我正在使用RecyclerView展示mp3歌曲列表。现在的问题是当我尝试删除歌曲时,虽然歌曲成功删除,但是项目仍然存在于RecyclerView中,似乎重新创建了一个项目,我不太理解它的原因。
如下图所示,这是发生的情况。
就像您在上面的截图中看到的那样,我尝试删除一首歌曲,但歌曲仍然在列表中,并且在它后面还创建了另一个列表。我不知道发生了什么事情。
这是我的SongFragment代码:
如下图所示,这是发生的情况。
![enter image description here](https://istack.dev59.com/r65MC.webp)
这是我的SongFragment代码:
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
activityView = inflater.inflate(R.layout.fragment_song, container, false);
// SongsLibrary songsLibrary = new SongsLibrary();
// songsLibrary.getSongThumnail(getActivity(), songArt);
swipeRefreshLayout = activityView.findViewById(R.id.swiperefresh);
if(arrayList == null){
SongsLibrary songsLibrary = new SongsLibrary();
songsLibrary.getSongs(getActivity());
}
mIntentFilter = new IntentFilter();
mIntentFilter.addAction(deteleSong);
setUpMusic();
return activityView;
}
private void setUpMusic() {
// todo when there is no activity and no song player than arraylist.size on null object
RecyclerView songRecyclerView = activityView.findViewById(R.id.song_list);
songRecyclerView.setNestedScrollingEnabled(false);
songRecyclerView.setHasFixedSize(true);
LinearLayoutManager linearLayoutManager = new LinearLayoutManager(getActivity());
songRecyclerView.setLayoutManager(linearLayoutManager);
songRecyclerView.setHasFixedSize(true);
SongAdapter mAdapter = new SongAdapter(getActivity(), getMusic());
songRecyclerView.setAdapter(mAdapter);
}
public List<SongObject> getMusic() {
List<SongObject> recentSongs = new ArrayList<>();
names = new String[arrayList.size()];
names = arrayList.toArray(names);
singer = new String[artistName.size()];
singer = artistName.toArray(singer);
art = new String[songThumb.size()];
art = songThumb.toArray(art);
for(int i = 0; i < arrayList.size(); i++){
recentSongs.add(new SongObject(names[i], singer[i], art[i]));
}
return recentSongs;
}
@Override
public void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
BroadcastReceiver broadcastReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
switch (action)
{
case deteleSong:
int postion = intent.getIntExtra("position",0); //todo remove item by position
break;
}
}
};
@Override
public void onDestroy() {
super.onDestroy();
}
@Override
public void onPause() {
super.onPause();
if(broadcastReceiver != null)
getActivity().unregisterReceiver(broadcastReceiver);
}
SongAdapter.java
public class SongAdapter extends RecyclerView.Adapter<SongViewHolder>{
private Context context;
private List<SongObject> allSongs;
MyEditText options;
SongViewHolder songViewHolder;
public SongAdapter(Context context, List<SongObject> allSongs) {
this.context = context;
this.allSongs = allSongs;
}
@Override
public SongViewHolder onCreateViewHolder(ViewGroup parent, final int viewType) {
View view = LayoutInflater.from(context).inflate(R.layout.song_list_layout, parent, false);
options = view.findViewById(R.id.options);
return new SongViewHolder(view);
}
@Override
public void onBindViewHolder(SongViewHolder holder, final int position) {
songViewHolder = holder;
holder.setIsRecyclable(false);
options.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
showOptions(view, position);
}
});
SongObject songs = allSongs.get(position);
holder.songTitle.setText(songs.getSongTitle());
holder.songAuthor.setText(songs.getSongAuthor());
Glide.with(context)
.load(songs.getSongCover())
.asBitmap()
.placeholder(R.drawable.player)
.error(R.drawable.player)
.override(200,200)
.fitCenter()
.diskCacheStrategy(DiskCacheStrategy.ALL)
.into(holder.songImage);
}
private void showOptions(final View v, final int pos) {
PopupMenu popup = new PopupMenu(context, v);
MenuInflater inflater = popup.getMenuInflater();
inflater.inflate(R.menu.song_options, popup.getMenu());
popup.show();
popup.setOnMenuItemClickListener(new PopupMenu.OnMenuItemClickListener() {
@Override
public boolean onMenuItemClick(MenuItem menuItem) {
int id = menuItem.getItemId();
switch (id) {
case R.id.optionPlay:
play(context, pos);
// songFragment.play(context, pos);
break;
case R.id.optionDelete:
showAlert(context, pos);
break;
case R.id.optionDetails:
// getSongDetails(context, pos);
break;
}
return true;
}
});
}
public void play(Context context, int pos){
// Start Service when User Select a song :)
Intent serviceIntent = new Intent(context, NotificationService.class);
serviceIntent.setAction(Constants.ACTION.STARTFOREGROUND_ACTION);
serviceIntent.putExtra("pos", pos);
serviceIntent.putExtra("search","");
// Log.d("SendingData","Sended :"+ songIndex);
context.startService(serviceIntent);
//send broadcast for showing slideup panel
//send Broadcast
Intent broadcastIntent = new Intent();
broadcastIntent.setAction(MusicActivity.mMediaStart);
broadcastIntent.putExtra("isStart", 1);
context.sendBroadcast(broadcastIntent);
}
private void showAlert(final Context context, final int position){
AlertDialog.Builder builder = new AlertDialog.Builder(context, R.style.Theme_AppCompat_Light_Dialog_Alert);
builder.setMessage("Do you want to delete this song?")
.setPositiveButton("Yes", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
deleteSong(context, position);
}
})
.setNegativeButton("No", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
}
});
// Create the AlertDialog object and return it
builder.show();
}
public void deleteSong(Context ctx, int pos){
ArrayList<String> songList = songPath;
final String songName = songList.get(pos);
final int songPos = pos;
new android.os.Handler().postDelayed(new Runnable(){
@Override
public void run() {
// Set up the projection (we only need the ID)
String[] projection = { MediaStore.Audio.Media._ID };
// Match on the file path
String selection = MediaStore.Audio.Media.DATA + " = ?";
String[] selectionArgs = new String[] { songName };
// Query for the ID of the media matching the file path
Uri queryUri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;
ContentResolver contentResolver = context.getContentResolver();
Cursor c = contentResolver.query(queryUri, projection, selection, selectionArgs, null);
if (c.moveToFirst()) {
// We found the ID. Deleting the item via the content provider will also remove the file
long id = c.getLong(c.getColumnIndexOrThrow(MediaStore.Audio.Media._ID));
Uri deleteUri = ContentUris.withAppendedId(MediaStore.Audio.Media.EXTERNAL_CONTENT_URI, id);
contentResolver.delete(deleteUri, null, null);
} else {
// File not found in media store DB
Toast.makeText(context, "No Song Found", Toast.LENGTH_SHORT).show();
}
c.close();
}
}, 0);
File delete = new File(songName);
if(delete.exists()){
if(delete.delete()) {
//send broadcast to SongFragment to remove item from reycler View
arrayList.remove(pos);
songPath.remove(pos);
songThumb.remove(pos);
artistName.remove(pos);
songArt.remove(pos);
notifyItemRemoved(pos); //Remove item from the list
notifyItemRangeChanged(pos, arrayList.size());
// songViewHolder.itemView.setVisibility(View.GONE); //tried it but not working
//Optional
Intent intent = new Intent();
intent.setAction(SongFragment.deteleSong);
intent.putExtra("position",pos);
context.sendBroadcast(intent);
}
else
Toast.makeText(context, "Error while deleting File.", Toast.LENGTH_SHORT).show();
}
}
@Override
public int getItemCount() {
return allSongs.size();
}
}
notifyDataSetChanged()
方法呢? - Mohammad ZareigetAdapterPosition()
。你提供给remove方法的那个位置实际上是布局位置。而且你还有holder.setRecyclable(false)
- 为什么? - romtsn