布局充气器不充气视图

Question

我觉得在这段代码中我的布局没有被附加。我通过 toast,log.d 验证但没有任何效果。这里我用于回收视图视图持有者。代码如下

override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolder {
    val view = LayoutInflater.from(mContext).inflate(R.layout.posts_layout,parent,false)
    return ViewHolder(view)
}

和 onBindViewHolder.I 用户登录以检查此方法是否正在使用但未使用

override fun onBindViewHolder(holder: ViewHolder, position: Int) {
    firebaseUser = FirebaseAuth.getInstance().currentUser!!
    Log.d("binded", true.toString())
    val post = mPost[position]
    getPublisherInfo(holder.profileImage ,holder.userName , holder.userFullName ,post.getpublisher())
    Glide.with(mContext).load(post.getpostId()).placeholder(R.drawable.image).into(holder.postImage)
}

我还检查了我的列表大小 id 是否为 0。因为它使用了已用日志，它显示的列表大小为 5，这是正确的。这意味着我的数据正在从数据库中检索。所以它认为我的布局充气机不工作。它的代码是。

private fun readPosts() {
    val postsRef = FirebaseDatabase.getInstance().reference.child("Posts")
    postsRef.addValueEventListener(object : ValueEventListener{
        @SuppressLint("NotifyDataSetChanged")
        override fun onDataChange(snapshot: DataSnapshot) {
            postList.clear()
            for(snapshot in snapshot.children){
                val post = snapshot.getValue(Post::class.java)
                for (uid in (followingList as ArrayList<String>)) {
                    if (post!!.getpublisher().equals(uid)) {
                        postList.add(post)
                    }
                    Log.d("added", postList.size.toString())
                    Log.d("added", postList.toString())
                    postAdapter.notifyDataSetChanged()
                }
            }
        }

        override fun onCancelled(error: DatabaseError) {}

    })
}

我的整个适配器代码是

package com.u_me_pro.free.Adapters

class PostAdapter(private val mContext: Context,private val mPost: List<Post>) :
RecyclerView.Adapter<PostAdapter.ViewHolder>() {

private lateinit var firebaseUser : FirebaseUser


override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolder {
    val view = LayoutInflater.from(mContext).inflate(R.layout.posts_layout,parent,false)
    Log.d("attached layout","true")
    return ViewHolder(view)
}

 class ViewHolder(@NonNull itemView: View) : RecyclerView.ViewHolder(itemView){
    var description: TextView = itemView.findViewById(R.id.description)
    var userName: TextView = itemView.findViewById(R.id.user_name_post)
    var userFullName: TextView = itemView.findViewById(R.id.user_full_name_post)
    var commentCount: TextView = itemView.findViewById(R.id.comment_count)
    var likeCount: TextView = itemView.findViewById(R.id.love_count)
    var profileImage: RoundedImageView = itemView.findViewById(R.id.user_profile_image_post)
    var postImage: RoundedImageView = itemView.findViewById(R.id.post_image)
    var like: CardView = itemView.findViewById(R.id.post_image_like)
    var comment: CardView = itemView.findViewById(R.id.post_image_comment)
    var save: CardView = itemView.findViewById(R.id.post_image_save)
}



override fun onBindViewHolder(holder: ViewHolder, position: Int) {
    firebaseUser = FirebaseAuth.getInstance().currentUser!!
    Log.d("binded", true.toString())
    val post = mPost[position]
    getPublisherInfo(holder.profileImage ,holder.userName , holder.userFullName ,post.getpublisher())
    Glide.with(mContext).load(post.getpostId()).placeholder(R.drawable.image).into(holder.postImage)
}

override fun getItemCount(): Int {
    return mPost.size
}

private fun getPublisherInfo(profileImage: RoundedImageView, userName: TextView, userFullName: TextView, publisherId: String) {
    val usersRef = FirebaseDatabase.getInstance().reference.child("Users").child(publisherId)
    Log.d("publisher id",publisherId)
    usersRef.addValueEventListener(object :ValueEventListener{
        override fun onDataChange(snapshot: DataSnapshot) {
            if (snapshot.exists()){
                val user = snapshot.getValue(User::class.java)
                userName.text = user!!.getFullname()
                userFullName.text = user.getFullname()
                Glide.with(mContext).load(user.getImage()).placeholder(R.drawable.profile).into(profileImage)
            }
        }
        override fun onCancelled(error: DatabaseError) {
            Log.d(TAG, error.getMessage());
        }
    })
}
}

请尽快帮助我。 谢谢！

Answer 1

您正在更新帖子列表并通知适配器更改，但似乎您实际上并未将更新后的列表传递给适配器。

postAdapter.notifyDataSetChanged()

如果适配器中的实际数据没有改变，则不会做任何事情。

您应该在适配器中添加一种更新帖子列表的方法，例如

fun setPostData(posts: List<Post>) {
    this.adapterPosts = posts
    notifyDataSetChanged() // Either call this here or where you were before
}

这还需要您创建一个新变量来保存传入的列表

private var adapterPosts = mPosts