轻扫刷新以更新数据

我有一个recyclerview，当用户刷新刷新时，我想更新。

这是我的MainActity.kt

class MainActivity : AppCompatActivity(), LoaderManager.LoaderCallbacks<List<Coin>> { private val mCoinLoaderId = 1 private val mCoinEndpointUrl = "http://coincap.io/front" private var swipeRefreshLayout: SwipeRefreshLayout? = null override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_main) swipeRefreshLayout= findViewById<SwipeRefreshLayout>(R.id.swipe_refresh_layout) as SwipeRefreshLayout rv_coins.layoutManager = LinearLayoutManager(this) rv_coins.setHasFixedSize(true) runLoaders() swipeRefreshLayout?.setOnRefreshListener{ // This method performs the actual data-refresh operation. // The method calls setRefreshing(false) when it's finished. runLoaders() } } private fun runLoaders() { val connManager = getSystemService(Context.CONNECTIVITY_SERVICE) as ConnectivityManager val networkInfo = connManager.activeNetworkInfo if (networkInfo != null && networkInfo.isConnected) { loaderManager.initLoader(mCoinLoaderId, null , this) } else { Toast.makeText(this, "No Internet connection", Toast.LENGTH_SHORT).show() } } override fun onCreateLoader(id: Int, args: Bundle?): Loader<List<Coin>> { val baseUri: Uri = Uri.parse(mCoinEndpointUrl) return object : AsyncTaskLoader<List<Coin>>(this) { override fun onStartLoading() { forceLoad() } override fun loadInBackground(): List<Coin>? { return QueryUtils.fetchCoinData(baseUri.toString()) } } } override fun onLoadFinished(loader: Loader<List<Coin>>?, data: List<Coin>?) { if (data != null && !data.isEmpty()) { progressBar1.isEnabled = false if(swipeRefreshLayout?.isRefreshing!!) { swipeRefreshLayout?.isRefreshing = false } rv_coins.adapter = CoinAdapter(data) } } override fun onLoaderReset(loader: Loader<List<Coin>>?) { TODO("not implemented") //To change body of created functions use File | Settings | File Templates. } 

我有以下适配器

 class CoinAdapter(private val mCoinData: List<Coin>): RecyclerView.Adapter<CoinAdapter.CoinViewHolder>() { override fun onCreateViewHolder(parent: ViewGroup?, viewType: Int): CoinViewHolder { val inflater = LayoutInflater.from(parent?.context) return CoinViewHolder(inflater.inflate(R.layout.list_item, parent, false)) } override fun onBindViewHolder(holder: CoinViewHolder?, position: Int) { holder?.mCoinShortNameTV?.text = mCoinData[position].short holder?.mCoinLongNameTV?.text = mCoinData[position].longname holder?.mCoinPercentageTV?.text = """${mCoinData[position].perc.toString()}%""" if (mCoinData[position].perc < 0.0) { holder?.mCoinPercentageTV?.setTextColor(Color.parseColor("#F73757")) } else { holder?.mCoinPercentageTV?.setTextColor(Color.parseColor("#21BD2E")) } } override fun getItemCount(): Int { return mCoinData.size } inner class CoinViewHolder(itemView: View): RecyclerView.ViewHolder(itemView) { val mCoinLongNameTV: TextView = itemView.findViewById<TextView>(R.id.long_name) as TextView val mCoinPercentageTV: TextView = itemView.findViewById<TextView>(R.id.percentage) as TextView val mCoinShortNameTV: TextView = itemView.findViewById<TextView>(R.id.short_name) as TextView } 

但是，即使我在用户刷新刷新时调用runLoaders（）函数，也不会更新数据。 它甚至不调用获取函数来更新数据。

我的代码有什么问题？

Answer 1

只是使用

 loaderManager.initLoader(mCoinLoaderId, null, this).forceLoad() 

代替

 loaderManager.initLoader(mCoinLoaderId, null, this)