Android RecyclerView在AlertDialog对话框中不可见

我试图在

onActivityResult

方法中的

AlertDialog

上显示文件数据列表<代码>警报对话框正在弹出，但<代码>回收视图不可见，只有空对话框。我检查了适配器的ItemCount，它显示的列表大小很好

活动中的onActivityResult方法

@覆盖
受保护的void onActivityResult（int请求代码、int结果代码、意图数据）{
super.onActivityResult（请求代码、结果代码、数据）；
Uri；
字符串类型；
视图对话框视图；
RecyclerView对话框RecyclerView；
AlertDialog.Builder dialogBuilder=新建AlertDialog.Builder（此）；
ContentResolver cr=this.getContentResolver（）；
if（requestCode==1&&resultCode==RESULT\u确定）{
dialogView=LayoutInflater.from（getApplicationContext（））.flate（R.layout.alertdialog\u文件，null）；
dialogRecyclerview=dialogView.findViewById（R.id.alertdialog\u fiilerecyclerView）；
dialogBuilder.setView（dialogView）；
dialogRecyclerview.setHasFixedSize（true）；
dialogRecyclerview.setLayoutManager（新的LinearLayoutManager（this））；
dialogBuilder.setCancelable（真）；
uploadChatFileAdapter=新的uploadChatFileAdapter（uploadFileList）；
if（data.getClipData（）！=null）{
int totalItems=data.getClipData（）.getItemCount（）；
对于（int i=0；i

适配器类

UploadChatFileAdapter（列表uploadList）{
this.uploadList=上传列表；
}
@非空
@凌驾
public FileUploadViewHolder onCreateViewHolder（@NonNull ViewGroup父级，int viewType）{
视图v=LayoutInflater.from（parent.getContext（））.flate（R.layout.set\u meeting\u userlist\u item，parent，false）；
返回新的FileUploadViewHolder（v）；
}
@凌驾
public void onBindViewHolder（@NonNull FileUploadViewHolder，int位置）{
holder.txt.setText（uploadList.get（position））；
}
@凌驾
public int getItemCount（）{
返回uploadList.size（）；
}
类FileUploadViewHolder扩展了RecyclerView.ViewHolder{
文本视图；
FileUploadViewHolder（查看项目视图）{
超级（项目视图）；
txt=itemView.findViewById（R.id.set\u meeting\u userlist\u txtview）；
}
}

post

R.layout.alertdialog\u文件

和

R.layout.set\u会议\u用户列表\u项目

文件解决了它。。。recyclerview的高度应该是

wrap\u content

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    Uri uri;
    String type;
    View dialogView;
    RecyclerView dialogRecyclerview;
    AlertDialog.Builder dialogBuilder = new AlertDialog.Builder(this);
    ContentResolver cr = this.getContentResolver();
    if(requestCode==1 && resultCode==RESULT_OK){
        dialogView = LayoutInflater.from(getApplicationContext()).inflate(R.layout.alertdialog_files,null);
        dialogRecyclerview = dialogView.findViewById(R.id.alertdialog_fiilerecyclerView);
        dialogBuilder.setView(dialogView);
        dialogRecyclerview.setHasFixedSize(true);
        dialogRecyclerview.setLayoutManager(new LinearLayoutManager(this));
        dialogBuilder.setCancelable(true);
        uploadChatFileAdapter = new UploadChatFileAdapter(uploadFileList);
        if(data.getClipData()!=null){
            int totalItems = data.getClipData().getItemCount();
            for(int i = 0 ; i < totalItems ; i++){
                uri = data.getClipData().getItemAt(i).getUri();
                type = cr.getType(uri);
                uploadFileList.add(type);
                uploadChatFileAdapter.notifyDataSetChanged();
            }
        }else if(data.getData()!=null) {
            uri = data.getData();
            type = cr.getType(uri);
            uploadFileList.add(type);
            uploadChatFileAdapter.notifyDataSetChanged();
        }
        dialogRecyclerview.setAdapter(uploadChatFileAdapter);
        dialogBuilder.show();
    }
}

UploadChatFileAdapter(List<String> uploadList) {
        this.uploadList = uploadList;
    }

    @NonNull
    @Override
    public FileUploadViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.set_meeting_userlist_item,parent,false);
        return new FileUploadViewHolder(v);
    }

    @Override
    public void onBindViewHolder(@NonNull FileUploadViewHolder holder, int position) {
        holder.txt.setText(uploadList.get(position));
    }

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

    class FileUploadViewHolder extends RecyclerView.ViewHolder{
        TextView txt;
        FileUploadViewHolder(View itemView) {
            super(itemView);
            txt = itemView.findViewById(R.id.set_meeting_userlist_txtview);
        }
    }