如何避免回收站從頭頂回傳

我是初學者，我想創建具有喜歡和評論按鈕的帖子應用程式，但是當我單擊喜歡按鈕時，RecyclerView 會（滾動）回??到頂部。我希望它像 facebook 或 twitter 一樣，當點擊它時會彈出它而不是去頂部

主要活動

private void loadPosts() {

    DatabaseReference databaseReference=FirebaseDatabase.getInstance().getReference("Posts");
    databaseReference.addValueEventListener(new ValueEventListener() {
        @Override
        public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
            posts.clear();
           for (DataSnapshot dataSnapshot1:dataSnapshot.getChildren()){
               ModelPost modelPost=dataSnapshot1.getValue(ModelPost.class);
             posts.add(modelPost);
               adapterPosts=new AdapterPosts(getActivity(),posts);
               recyclerView.setAdapter(adapterPosts);

           }
        }

        @Override
        public void onCancelled(@NonNull DatabaseError databaseError) {

            Toast.makeText(getActivity(),databaseError.getMessage(),Toast.LENGTH_LONG).show();
        }
    });
}

我的配接器

  @Override
public void onBindViewHolder(@NonNull final MyHolder holder, final int position) {
    final String uid=modelPosts.get(position).getUid();
    String nameh=modelPosts.get(position).getUname();
    final String titlee=modelPosts.get(position).getTitle();
    final String descri=modelPosts.get(position).getDescription();
    final String ptime=modelPosts.get(position).getPtime();
    String dp=modelPosts.get(position).getUdp();
    String plike=modelPosts.get(position).getPlike();
    final String image=modelPosts.get(position).getUimage();
    String email=modelPosts.get(position).getUemail();
    String comm=modelPosts.get(position).getPcomments();
    final String pid=modelPosts.get(position).getPid();
    Calendar calendar=Calendar.getInstance(Locale.ENGLISH);
    calendar.setTimeInMillis(Long.parseLong(ptime));
    String timedate= DateFormat.format("dd/MM/yyyy hh:mm aa",calendar).toString();
    holder.name.setText(nameh);
    holder.title.setText(titlee);
    holder.description.setText(descri);
    holder.time.setText(timedate);
    holder.like.setText(plike   " Likes");
    holder.comments.setText(comm   " Comments");
    setLikes(holder,ptime);
    try {
        Picasso.with(context).load(dp).into(holder.picture);
    } catch (Exception e) {

    }

    if(image.equals("noImage")){

        holder.image.setVisibility(View.GONE);
    }
    else {
        holder.image.setVisibility(View.VISIBLE);
        try {
            Picasso.with(context).load(image).into(holder.image);
        }
        catch (Exception e){

        }
    }
    holder.more.setOnClickListener(new View.OnClickListener() {
        @RequiresApi(api = Build.VERSION_CODES.KITKAT)
        @Override
        public void onClick(View v) {
            showMoreOptions(holder.more,uid, myuid,ptime,image);
        }
    });
    holder.likebtn.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {


            final int plike=Integer.parseInt(modelPosts.get(position).getPlike());
            mprocesslike=true;
            final String postid=modelPosts.get(position).getPtime();
            liekeref.addValueEventListener(new ValueEventListener() {
                @Override
                public void onDataChange(@NonNull DataSnapshot dataSnapshot) {

                    if(mprocesslike){
                        if(dataSnapshot.child(postid).hasChild(myuid)){
                            postref.child(postid).child("plike").setValue("" (plike-1));
                            liekeref.child(postid).child(myuid).removeValue();
                            mprocesslike=false;
                        }
                        else {
                            postref.child(postid).child("plike").setValue("" (plike 1));
                            liekeref.child(postid).child(myuid).setValue("Liked");
                            mprocesslike=false;
                            addToHisNotification("" uid,"" postid,"Liked Your Post");
                        }
                    }
                }

                @Override
                public void onCancelled(@NonNull DatabaseError databaseError) {

                }
            });
        }
    });
    holder.comment.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Intent intent=new Intent(context, PostDetailsActivity.class);
            intent.putExtra("pid",ptime);
            context.startActivity(intent);
        }
    });
    holder.share.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            BitmapDrawable bitmapDrawable=(BitmapDrawable)holder.image.getDrawable();
            if(bitmapDrawable==null){
                shareTextOnly(titlee,descri);
            }
            else {
                Bitmap bitmap=bitmapDrawable.getBitmap();
                shareImageandText(titlee,descri,bitmap);
            }
        }
    });
    holder.profile.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Intent intent=new Intent(context, ThereProfileActivity.class);
            intent.putExtra("uid", uid);
            context.startActivity(intent);
        }
    });
    holder.like.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Intent intent=new Intent(context, PostLikedByActivity.class);
            intent.putExtra("pid",ptime);
            context.startActivity(intent);
        }
    });
}
private void shareTextOnly(String titlee, String descri) {

    String sharebody= titlee   "\n"   descri;
    Intent intentt=new Intent(Intent.ACTION_SEND);
    intentt.setType("text/plain");
    intentt.putExtra(Intent.EXTRA_SUBJECT,"Subject Here");
    intentt.putExtra(Intent.EXTRA_TEXT,sharebody);
    context.startActivity(Intent.createChooser(intentt,"Share Via"));
}

private void shareImageandText(String titlee, String descri, Bitmap bitmap) {
    Uri uri=saveImageToShare(bitmap);
    String sharebody= titlee   "\n"   descri;
    Intent intent=new Intent(Intent.ACTION_SEND);
    intent.putExtra(Intent.EXTRA_STREAM,uri);
    intent.putExtra(Intent.EXTRA_TEXT,sharebody);
    intent.putExtra(Intent.EXTRA_SUBJECT,"Subject Here");
    intent.setType("image/png");
    context.startActivity(Intent.createChooser(intent,"Share Via"));
}

private Uri saveImageToShare(Bitmap bitmap) {
    File imagefolder=new File(context.getCacheDir(),"images");
    Uri uri=null;
    try {
        imagefolder.mkdirs();
        File file=new File(imagefolder,"shared_image.png");
        FileOutputStream outputStream=new FileOutputStream(file);
        bitmap.compress(Bitmap.CompressFormat.PNG,90,outputStream);
        outputStream.flush();
        outputStream.close();
        uri= FileProvider.getUriForFile(context,"com.xzuma99.askpedia.fileprovider",file);
    }
    catch (Exception e){

        Toast.makeText(context,"" e.getMessage(),Toast.LENGTH_LONG).show();
    }
    return uri;
}

private void addToHisNotification(String hisUid,String pid,String notification){
    String timestamp="" System.currentTimeMillis();
    HashMap<Object,String> hashMap=new HashMap<>();
    hashMap.put("pid",pid);
    hashMap.put("timestamp",timestamp);
    hashMap.put("puid",hisUid);
    hashMap.put("notification",notification);
    hashMap.put("suid",myuid);
    DatabaseReference reference=FirebaseDatabase.getInstance().getReference("Users");
    reference.child(hisUid).child("Notifications").child(timestamp).setValue(hashMap)
            .addOnSuccessListener(new OnSuccessListener<Void>() {
                @Override
                public void onSuccess(Void aVoid) {

                }
            }).addOnFailureListener(new OnFailureListener() {
        @Override
        public void onFailure(@NonNull Exception e) {

        }
    });

}
private void setLikes(final MyHolder holder,final String pid) {
    liekeref.addValueEventListener(new ValueEventListener() {
        @Override
        public void onDataChange(@NonNull DataSnapshot dataSnapshot) {

            if(dataSnapshot.child(pid).hasChild(myuid)){
                holder.likebtn.setCompoundDrawablesWithIntrinsicBounds(R.drawable.ic_star_liked,0,0,0);
                holder.likebtn.setText("Liked");
            }
            else {
                holder.likebtn.setCompoundDrawablesWithIntrinsicBounds(R.drawable.ic_star_like,0,0,0);
                holder.likebtn.setText("Like");
            }
        }

        @Override
        public void onCancelled(@NonNull DatabaseError databaseError) {

        }
    });

}


@RequiresApi(api = Build.VERSION_CODES.KITKAT)
private void showMoreOptions(ImageButton more, String uid, String myuid, final String pid, final String image) {

    PopupMenu popupMenu=new PopupMenu(context,more, Gravity.END);
    if(uid.equals(myuid)){
        popupMenu.getMenu().add(Menu.NONE,0,0,"Delete");
        popupMenu.getMenu().add(Menu.NONE,1,0,"Edit");
    }
    popupMenu.getMenu().add(Menu.NONE,2,0,"View Post");
    popupMenu.setOnMenuItemClickListener(new PopupMenu.OnMenuItemClickListener() {
        @Override
        public boolean onMenuItemClick(MenuItem item) {
            if(item.getItemId()==0){
                beginDelete(pid,image);
            }
            else if(item.getItemId()==1){
                Intent intent=new Intent(context, AddPostActivity.class);
                intent.putExtra("key","editpost");
                intent.putExtra("editpostId",pid);
                context.startActivity(intent);
            }
            else if(item.getItemId()==2){
                Intent intent=new Intent(context, PostDetailsActivity.class);
                intent.putExtra("pid",pid);
                context.startActivity(intent);
            }
            return false;
        }
    });
    popupMenu.show();
}

private void beginDelete(String pid, String image) {

    if(image.equals("noImage")){
        deleteWithoutImage(pid);
        deletelike(pid);
    }
    else {
        deltewithImage(pid,image);
        deletelike(pid);
    }
}

private void deletelike(String pid) {
    Query query= FirebaseDatabase.getInstance().getReference("Likes").child(pid);
    query.addValueEventListener(new ValueEventListener() {
        @Override
        public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
                dataSnapshot.getRef().removeValue();
            Toast.makeText(context,"Deleted Sucessfully",Toast.LENGTH_LONG).show();
        }

        @Override
        public void onCancelled(@NonNull DatabaseError databaseError) {

        }
    });
}

private void deltewithImage(final String pid, String image) {
    final ProgressDialog pd=new ProgressDialog(context);
    pd.setMessage("Deleting");
    StorageReference picref= FirebaseStorage.getInstance().getReferenceFromUrl(image);
    picref.delete().addOnSuccessListener(new OnSuccessListener<Void>() {
        @Override
        public void onSuccess(Void aVoid) {
            Query query= FirebaseDatabase.getInstance().getReference("Posts").orderByChild("ptime").equalTo(pid);
            query.addValueEventListener(new ValueEventListener() {
                @Override
                public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
                  for (DataSnapshot dataSnapshot1:dataSnapshot.getChildren()){
                      dataSnapshot1.getRef().removeValue();
                  }

                  pd.dismiss();
                  Toast.makeText(context,"Deleted Sucessfully",Toast.LENGTH_LONG).show();
                }

                @Override
                public void onCancelled(@NonNull DatabaseError databaseError) {

                }
            });
        }
    }).addOnFailureListener(new OnFailureListener() {
        @Override
        public void onFailure(@NonNull Exception e) {

        }
    });
}


private void deleteWithoutImage(String pid) {
    final ProgressDialog pd=new ProgressDialog(context);
    pd.setMessage("Deleting");
    Query query= FirebaseDatabase.getInstance().getReference("Posts").orderByChild("ptime").equalTo(pid);
    query.addValueEventListener(new ValueEventListener() {
        @Override
        public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
            for (DataSnapshot dataSnapshot1:dataSnapshot.getChildren()){
                dataSnapshot1.getRef().removeValue();
            }
            pd.dismiss();
            Toast.makeText(context,"Deleted Sucessfully",Toast.LENGTH_LONG).show();
        }

        @Override
        public void onCancelled(@NonNull DatabaseError databaseError) {

        }
    });
}

@Override
public int getItemCount() {
    return modelPosts.size();
}

class MyHolder extends RecyclerView.ViewHolder{
    ImageView picture,image;
    TextView name,time,title,description,like,comments;
    ImageButton more;
    Button likebtn,comment,share;
    LinearLayout profile;
    public MyHolder(@NonNull View itemView) {
        super(itemView);



        picture=itemView.findViewById(R.id.picturetv);
        image=itemView.findViewById(R.id.pimagetv);
        name=itemView.findViewById(R.id.unametv);
        time=itemView.findViewById(R.id.utimetv);
        more=itemView.findViewById(R.id.morebtn);
        title=itemView.findViewById(R.id.ptitletv);
        description=itemView.findViewById(R.id.descript);
        like=itemView.findViewById(R.id.plikeb);
        comments=itemView.findViewById(R.id.pcommentco);
        likebtn=itemView.findViewById(R.id.like);
        comment=itemView.findViewById(R.id.comment);
        share=itemView.findViewById(R.id.share);
        profile=itemView.findViewById(R.id.profilelayout);
    }
}

}

它有喜歡和評論按鈕，但是當我點擊喜歡按鈕時，RecyclerView 會（滾動）回??到頂部。我希望它像 facebook 或 twitter 一樣，當點擊它時會彈出它而不是去頂部

uj5u.com熱心網友回復：

您可以采用兩種方法來實作這一點。

1. 不要在被點擊的按鈕上重新填充回收者視圖。

使用該方法 yourRecyclerViewName.findViewHolderForAdapterPosition(pos);獲取要更改其喜歡符號的特定視圖的參考。然后改變它的屬性。

2. 重新填充但保存喜歡按鈕的滾動位置，以便它自動移動到該位置。利用 yourRecyclerViewName.scrollToPosition(pos);

如何滾動到位置 StackOverflow 答案

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