在活动中发送和添加回收器视图数据时遇到问题

Question

我正在尝试开发一个音乐应用程序，所以我有两个活动，如ArtistActivity和FavoriteActivity。我的ArtistActivity包含一个RecyclerView，它可以在ListView中加载SongName、SongUrl、SongArtist，并从Firebase加载数据，对于每个项目，项目末尾都有一个心跳图标。我的主要问题是当我单击项目时，我想在其他活动中发送点击的项目，这是我FavoriteActivity，我想在单击项目时播放歌曲FavoriteActivity。因此，为此，我需要在FavoriteActivity中管理SongUrl，我对这个话题感到困惑。

例如：

当我们单击Add to favorite in some apps时，您可以举例说明 Spotify 在我的应用程序中。我想构建相同的函数，我在下面提供了我的代码。因此，如果您对我的问题有任何答案，请回答我。

这是我的代码：

我的适配器类 ：

package com.geetmp3.GeetMp3.ArtistPanel;
import android.animation.Animator;
import android.animation.AnimatorListenerAdapter;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.LinearLayout;
import android.widget.TextView;
import android.widget.Toast;
import androidx.annotation.NonNull;
import androidx.recyclerview.widget.RecyclerView;
import com.bumptech.glide.Glide;
import com.geetmp3.GeetMp3.R;
import java.util.List;
import de.hdodenhof.circleimageview.CircleImageView;
import xyz.hanks.library.bang.SmallBangView;
public class PanelAdapter extends RecyclerView.Adapter<PanelAdapter.PanelViewHolder> {

private Context mContext;
private List<PanelList> mUploads;

public PanelAdapter(Context context, List<PanelList> panelList) {
mContext = context;
mUploads = panelList;
}
@NonNull
@Override
public PanelViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
View v = LayoutInflater.from(mContext).inflate(R.layout.artist_recycler_layout, parent, false);
return new PanelViewHolder(v);
// Toast.makeText(mContext, "" + ge, Toast.LENGTH_SHORT).show();
}
@Override
public void onBindViewHolder(@NonNull PanelViewHolder holder, int position) {
PanelList panelList = mUploads.get(position);

holder.textViewName.setText(panelList.getSongName());
Glide.with(mContext)
.load(panelList.getSongImageUri())
.centerCrop()
.into(holder.circleImageView);
//       
holder.bangView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
if (holder.bangView.isSelected()) {
holder.bangView.setSelected(false);
// What can i do here 

} else {
holder.bangView.setSelected(true);
holder.bangView.likeAnimation(new AnimatorListenerAdapter() {
@Override
public void onAnimationEnd(Animator animation) {
super.onAnimationEnd(animation);
Toast.makeText(mContext, mUploads.get(position).getSongName() + "Added to playlist", Toast.LENGTH_SHORT).show();
}
});
}
}
});

}
@Override
public int getItemCount() {
return mUploads.size();
}
public class PanelViewHolder extends RecyclerView.ViewHolder {
private TextView textViewName;
private CircleImageView circleImageView;
private LinearLayout thisLayout;
private SmallBangView bangView;

public PanelViewHolder(@NonNull View itemView) {
super(itemView);
thisLayout = itemView.findViewById(R.id.artist_linear);
textViewName = itemView.findViewById(R.id.artist_song_name);
circleImageView = itemView.findViewById(R.id.artist_songs_image);
bangView = itemView.findViewById(R.id.bang_like_heart);

}
}
}

我的二传手和二传手类：

public class PanelList {

private String SongName;
private String SongUrl;
private String SongImageUri;
private String SongLyrics;
private String SongMusicDirector;
private String SongProducer;
private String SongArtist;
public PanelList() {
}
public PanelList(String SongName, String SongUrl, String SongImageUri, String SongArtist, String SongLyrics, String SongMusicDirector, String SongProducer) {
this.SongName = SongName;
this.SongUrl = SongUrl;
this.SongImageUri = SongImageUri;
this.SongArtist = SongArtist;
this.SongLyrics = SongLyrics;
this.SongMusicDirector = SongMusicDirector;
this.SongProducer = SongProducer;
}

public String getSongArtist() {
return SongArtist;
}

public String getSongLyrics() {
return SongLyrics;
}

public String getSongMusicDirector() {
return SongMusicDirector;
}

public String getSongProducer() {
return SongProducer;
}

public String getSongName() {
return SongName;
}

public String getSongUrl() {
return SongUrl;
}

public String getSongImageUri() {
return SongImageUri;
}

}

我的艺人活动 ：

public class ArtistActivity extends AppCompatActivity {
private RecyclerView mRecyclerView;
private ValueEventListener eventListener;
private DatabaseReference mDataRef, artist_ref;
private List<PanelList> mList;
private PanelAdapter panelAdapter;
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.artist1layout);
mRecyclerView = findViewById(R.id.artist_song_recyclerview);
mDataRef = FirebaseDatabase.getInstance().getReference("ArtistView").child(getIntent().getStringExtra("Artist"))
.child("Songs");

mRecyclerView.setHasFixedSize(true);
mDataRef.keepSynced(true);
mRecyclerView.setLayoutManager(new LinearLayoutManager(this));
mList = new ArrayList<>();
panelAdapter = new PanelAdapter(ArtistActivity.this, mList);
mRecyclerView.setAdapter(panelAdapter);
eventListener = mDataRef.addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
mList.clear();
for (DataSnapshot postSnapshot : dataSnapshot.getChildren()) {
PanelList list = postSnapshot.getValue(PanelList.class);
mList.add(list);

}
panelAdapter.notifyDataSetChanged();
}
@Override
public void onCancelled(@NonNull DatabaseError databaseError) {
}
});
}
}

除了onCreate，我的FavoriteActivity什么都没有.

Answer 1

如果适配器是动态的，则不要在适配器中传递列表。

在适配器中添加此功能

public void setPanelList(List<PanelList> panelList){
panelList = mList;
notifyDataSetChanged();
}

修改您的mDataRef.addValueEventListener

@Override
public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
mList.clear();
for (DataSnapshot postSnapshot : dataSnapshot.getChildren()) {
PanelList list = postSnapshot.getValue(PanelList.class);
mList.add(list);
}
panelAdapter.setPanelList(mList);
}

希望这有帮助。