java在Android上滚动RecyclerView时如何修复计时器?
在我的应用程序中,我想使用多个CountDownTimer
来显示RecyclerView
中提供的剩余时间。我已经在Kotlin中编写了下面的代码,但是在滚动计时器的同时,计时器会继续重新启动。例如,计时器从4:19开始,10秒后滚动显示4:09而不是4:09,但仍然显示4:19
活动代码:
class MainActivity : AppCompatActivity() {
private lateinit var apisList: ApisList
private lateinit var retrofit: Retrofit
private lateinit var todayAdapter: AuctionsTodayAdapter
private val todayModel: MutableList<Today> = mutableListOf()
private lateinit var layoutManager: RecyclerView.LayoutManager
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
//Initialize
retrofit = ApiClient.instance
apisList = retrofit.create(ApisList::class.java)
todayAdapter = AuctionsTodayAdapter(themedContext, todayModel)
layoutManager = LinearLayoutManager(themedContext)
//RecyclerView
main_list.setHasFixedSize(true)
main_list.layoutManager = layoutManager
main_list.adapter = todayAdapter
if (isNetworkAvailable()) getData(1, 10)
}
private fun getData(page: Int, limit: Int) {
main_loader.visibility = View.VISIBLE
val call = apisList.getAuctionsToday(page, limit)
call.let {
it.enqueue(object : Callback<AuctionsTodayResponse> {
override fun onFailure(call: Call<AuctionsTodayResponse>, t: Throwable) {
main_loader.visibility = View.GONE
Log.e("auctionsTodayList", t.message)
}
override fun onResponse(call: Call<AuctionsTodayResponse>, response: Response<AuctionsTodayResponse>) {
if (response.isSuccessful) {
response.body()?.let { itBody ->
main_loader.visibility = View.GONE
if (itBody.toString().isNotEmpty()) {
todayModel.clear()
todayModel.addAll(itBody.res.today)
todayAdapter.notifyDataSetChanged()
}
}
}
}
})
}
}
}
适配器代码:
class AuctionsTodayAdapter(val context: Context, val model: MutableList<Today>) :
RecyclerView.Adapter<AuctionsTodayAdapter.MyHolder>() {
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): MyHolder {
val view = LayoutInflater.from(context).inflate(R.layout.row_main_list, parent, false)
val holder = MyHolder(view)
//holder.setIsRecyclable(false)
return holder
}
override fun getItemCount(): Int {
return model.size
}
override fun onBindViewHolder(holder: MyHolder, position: Int) {
val modelUse = model[position]
holder.setData(modelUse)
if (holder.newCountDownTimer != null) {
holder.newCountDownTimer!!.cancel()
}
var timer = modelUse.calculateEnd
timer = timer * 1000
holder.newCountDownTimer = object : CountDownTimer(timer, 1000) {
override fun onTick(millisUntilFinished: Long) {
var seconds = (millisUntilFinished / 1000).toInt()
val hours = seconds / (60 * 60)
val tempMint = seconds - hours * 60 * 60
val minutes = tempMint / 60
seconds = tempMint - minutes * 60
holder.rowMain_timer.rowMain_timer.text =
String.format("%02d", hours) + ":" + String.format(
"%02d",
minutes
) + ":" + String.format("%02d", seconds)
}
override fun onFinish() {
holder.rowMain_timer.text = "00:00:00"
}
}.start()
}
inner class MyHolder(itemView: View) : RecyclerView.ViewHolder(itemView) {
var newCountDownTimer: CountDownTimer? = null
lateinit var rowMain_timer: TextView
init {
rowMain_timer = itemView.findViewById(R.id.rowMain_timer)
}
fun setData(model: Today) {
model.image.let {
Glide.with(context)
.load(Constants.MAIN_BASE_URL + it)
.apply(RequestOptions.diskCacheStrategyOf(DiskCacheStrategy.RESOURCE))
.into(itemView.rowMain_img)
}
model.title.let { itemView.rowMain_title.text = it }
}
}
我怎样才能解决这个问题
# 1 楼答案
当您想在适配器中使用
Timer
时,不应在onBindViewHolder
中使用此选项因为
onBindViewHolder
在滚动项目时调用every您应该在适配器的构造函数中使用计时器,并每隔一秒
notifyDataSetChanged
使用适配器别担心,这是一种结构不错的方式,而且不会出现内存泄漏。您可以在配置文件选项卡中查看此信息
我希望我能帮助你
# 2 楼答案
每个
ViewHolder
都有CountDownTimer
。每次滚动时,recyclerView都会创建新的CountDownTimer
。因此,如果我正确地理解了您的问题,那么您应该为整个适配器使用单个CountDownTimer
。使其成为适配器类的本地字段