Question

我知道这个问题已经被提出，但是我尝试了他们提出的所有解决方案，但没有任何效果。我在主线程中创建了适配器，在onCreate函数中添加了适配器，但仍然无法正常工作。在结束我的问题之前，请查看我的代码并告诉我我在做什么错。

class PostsActivity : AppCompatActivity() {
    var recyclerView: RecyclerView? = null
    var postObjList : ArrayList<PostObj>? = null
    var postContentList : ArrayList<PostContentObj>? = null

    var viewModel : PostsViewModel? = null

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_posts)

        initRecyclerView()

        viewModel = PostsViewModel(recyclerView!!, postObjList!!, postContentList!!)
        val activityPostsBinding: ActivityPostsBinding =
            DataBindingUtil.setContentView(this, R.layout.activity_posts)
        activityPostsBinding.viewModel = viewModel
        viewModel!!.loadIdList()

    }

    private fun initRecyclerView() {
        recyclerView = findViewById(R.id.posts_recycler_view)

        postObjList = ArrayList()
        postObjList!!.add(PostObj("a", "a", "a", "a", "a"))
        postContentList = ArrayList()
        recyclerView!!.adapter = PostsAdapter(this, postObjList!!, postContentList!!)
        recyclerView!!.layoutManager = LinearLayoutManager(this)

    }
}

class PostsAdapter(val context: Context, val posts: ArrayList<PostObj>, val postsContent: ArrayList<PostContentObj>) : RecyclerView.Adapter<PostsAdapter.ViewHolder>() {


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

    override fun onBindViewHolder(holder: ViewHolder, position: Int) {
        val currentPostObj = posts.get(position)
        holder.publisher.text = currentPostObj.publisher
    }

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

    inner class ViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView) {
        val publisher : TextView = itemView.findViewById(R.id.post_publisher)
        val parentLayout : RelativeLayout = itemView.findViewById(R.id.parent_layout)

    }
}

我在做什么错？我查看了其他帖子中的其他答案，但仍然无法使它起作用。这是我正在看的帖子 The post

Answer 1

 override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        val activityPostsBinding: ActivityPostsBinding =
            DataBindingUtil.setContentView(this, R.layout.activity_posts)
        // replaced setContentView with above line
        // this way recyclerView = findViewById(R.id.posts_recycler_view) is correct view
        initRecyclerView()

        viewModel = PostsViewModel(recyclerView!!, postObjList!!, postContentList!!)
        
        activityPostsBinding.viewModel = viewModel
        viewModel!!.loadIdList()

    }

您收到此错误是因为setContentView(R.layout.activity_posts)中同时有DataBindingUtil.setContentView(this, R.layout.activity_posts)和onCreate，所以当您从recyclerView获得findViewById(R.id.posts_recycler_view)时，可能会得到错误的recyclerView。 / p>

错误E / RecyclerView：未连接适配器；跳过布局？

1 个答案: