我试图弄清楚如何在从接收器接收进度更新后更新特定项目的进度条。
这是我片段中的接收者：
private val mReceiver = object : BroadcastReceiver() {
override fun onReceive(context: Context, intent: Intent) {
when(intent.action) {
PROGRESS_UPDATE_ACTION -> {
val resId = intent.extras.getInt("resourceID")
val progress = intent.extras.getInt("contentLength$resId")
val maxProgress = intent.extras.getLong("maxProgress$resId")
adapter.update(resId, progress, maxProgress)
}
}
}
}
适配器从数据库填充。每个项目都有一个唯一的resourceID。
private fun loadDataFromBox(){
val query = SaveOfflineManager().getAll()
val saveOfflineData = LinkedHashMap<Int, SaveOfflineData>()
query.forEach {
saveOfflineData[it.resourceID!!] = it
}
adapter.setData(saveOfflineData)
adapter.notifyDataSetChanged()
}
这是我简化的适配器。如您所见，我不知道如何处理从接收器接收更新的方法。我试着寻找解决方案几个小时但似乎找不到任何解决方案。
class SaveOfflineAdapter : RecyclerView.Adapter<SaveOfflineAdapter.SimpleViewHolder>() {
private var downloadMap : LinkedHashMap<Int, SaveOfflineData> = LinkedHashMap()
private var utils : Utils = Utils()
fun setData(downloadist : LinkedHashMap<Int, SaveOfflineData>) {
this.downloadMap.clear()
this.downloadMap = downloadist
this.notifyDataSetChanged()
}
fun update(resourceID : Int, progress : Int, maxProgress : Long) {
// update progress for a specific resourceID
// what to do here?
this.notifyDataSetChanged() // makes app real slow when called repeatedly
}
override fun getItemCount(): Int {
return downloadMap.count()
}
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): SimpleViewHolder {
val view = LayoutInflater.from(parent.context).inflate(R.layout.save_offline_container_layout, parent, false)
return SimpleViewHolder(view)
}
override fun onBindViewHolder(holder: SimpleViewHolder, position: Int) {
holder.savedData = ArrayList(downloadMap.values)[position]
if (ArrayList(downloadMap.values)[position].status == "Completed") {
holder.downloadProgress?.visibility = View.INVISIBLE
} else {
holder.downloadProgress?.visibility = View.VISIBLE
// update progress here??
// holder.downloadProgress.progress = holder.savedData.progress!!
// holder.downloadProgress.max = holder.savedData.totalContentLength!!
}
}
inner class SimpleViewHolder(v: View, var savedData: SaveOfflineData? = null) : RecyclerView.ViewHolder(v) {
var downloadProgress : ProgressBar? = v.findViewById(R.id.saveOffProgress)
}
}
简化的片段代码：
class SaveOfflineFragment: BaseFragment(), View.OnClickListener{
var adapter = SaveOfflineAdapter()
var tabKey = 0
private var saveOfflineRecyclerView : RecyclerView? = null
private val mReceiver = object : BroadcastReceiver() {
override fun onReceive(context: Context, intent: Intent) {
when(intent.action) {
PROGRESS_UPDATE_ACTION -> {
val resId = intent.extras.getInt("resourceID")
val progress = intent.extras.getInt("contentLength$resId")
val maxProgress = intent.extras.getLong("maxProgress$resId")
adapter.update(resId, progress, maxProgress)
}
DOWNLOAD_DONE_ACTION -> {
loadDataFromBox()
}
}
}
}
override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
rootView = inflater.inflate(R.layout.saveoffline_layout, container, false)
activity!!.requestedOrientation = ActivityInfo.SCREEN_ORIENTATION_PORTRAIT
ScreenTracking.getInstance().track(TAG_SAVE_OFFLINE_FRAG + tabKey, false)
getViews()
setIds()
setViews()
return rootView
}
private fun getViews() {
saveOfflineRecyclerView = rootView!!.recyclerview_main
}
private fun setIds(){
val idRecyclerView: IntArray = intArrayOf(R.id.saveOfflineRecyclerView1, R.id.saveOfflineRecyclerView2, R.id.saveOfflineRecyclerView3, R.id.saveOfflineRecyclerView4)
val position = tabKey - 1
saveOfflineRecyclerView!!.id = idRecyclerView [position]
}
private fun setViews(){
saveOfflineRecyclerView!!.layoutManager = LinearLayoutManager(activity, LinearLayoutManager.VERTICAL, false)
saveOfflineRecyclerView!!.layoutManager!!.isItemPrefetchEnabled = true
saveOfflineRecyclerView!!.isNestedScrollingEnabled = false
saveOfflineRecyclerView!!.setHasFixedSize(true)
saveOfflineRecyclerView!!.setItemViewCacheSize(20)
saveOfflineRecyclerView!!.isDrawingCacheEnabled = true
saveOfflineRecyclerView!!.drawingCacheQuality = View.DRAWING_CACHE_QUALITY_HIGH
adapter.hasStableIds()
saveOfflineRecyclerView!!.adapter = adapter
}
override fun onClick(v: View?) {
when (v!!.id) {
R.id.saveOfflineSearchBtn1, R.id.saveOfflineSearchBtn2, R.id.saveOfflineSearchBtn3, R.id.saveOfflineSearchBtn4 -> {
}
R.id.confirmDeleteCancel -> {
}
R.id.confirmDeleteYes -> {
}
}
}
override fun onResume() {
println("On resume, registering receiver")
super.onResume()
val mIntentFilter = IntentFilter()
mIntentFilter.addAction(PROGRESS_UPDATE_ACTION)
mIntentFilter.addAction(DOWNLOAD_DONE_ACTION)
BuriIOApp.context.registerReceiver(mReceiver, mIntentFilter)
}
override fun onPause() {
println("onpause unregistering receiver")
BuriIOApp.context.unregisterReceiver(mReceiver)
super.onPause()
}
override fun onAttach(context: Context?) {
super.onAttach(context)
tabKey = arguments!!.getInt("tabKey")
fragmentCallback = context as FragmentCallback
loadDataFromBox()
}
private fun loadDataFromBox(){
val query = SaveOfflineManager().getAll()
val saveOfflineData = LinkedHashMap<Int, SaveOfflineData>()
query.forEach {
saveOfflineData[it.resourceID!!] = it
}
adapter.setData(saveOfflineData)
adapter.notifyDataSetChanged()
}
companion object {
fun newInstance(tabKey : Int): SaveOfflineFragment {
val args = Bundle()
args.putInt("tabKey", tabKey)
val fragment = SaveOfflineFragment()
fragment.arguments = args
return fragment
}
}
}