我有一个用户录制声音的列表 用户可以单击列表并播放音频文件 如何正确处理搜索栏中的 MediaPlayer 和 RecyclerView 项目以及 MVVM 中的项目？ 也就是说，当用户单击时，访问者会更改该项目并进行自我更新，而当再次单击该项目时，访问者会进行自我更新。
我现在就这样做了，但不幸的是，这是最肮脏的形式
活动代码：
class SoundListActivity : BaseActivity(), Observer<List<VoiceEntity>>, VoiceAdapter.OnClickItemListener,
OnMultiSelectVoiceListener {
private lateinit var viewModel: VoiceViewModel
private val adapter = VoiceAdapter()
private val player = MediaPlayer()
private var positionPlayItem = -1
companion object {
fun start(context: Context) {
context.startActivity(Intent(context, SoundListActivity::class.java))
}
}
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_sound_list)
viewModel = ViewModelProviders.of(this).get(VoiceViewModel::class.java)
viewModel.mutableList!!.observe(this, this)
adapter.onItemClickListener = this
adapter.listenerMultiSelect = this
recycler.layoutManager = LinearLayoutManager(this)
recycler.adapter = adapter
fabAdd.setOnClickListener {
stopPlay()
RecordSoundActivity.start(this)
}
toolbar.setIconLeftListener(View.OnClickListener {
stopPlay()
finish()
})
}
override fun onChanged(list: List<VoiceEntity>?) {
this.progressBar.visibility = View.GONE
this.layoutEmptyState.visibility = View.INVISIBLE
this.adapter.removeAll()
if (list == null || list.isEmpty()) {
layoutEmptyState.visibility = View.VISIBLE
return
}
adapter.addItems(ArrayList(list))
}
override fun onClickItem(item: VoiceEntity, position: Int) {
if (player.isPlaying) {
player.reset()
}
if (item.isPlaying) {
item.isPlaying = false
player.reset()
adapter.notifyDataSetChanged()
return
}
this.positionPlayItem = position
adapter.items!!.forEach {
if (it != item) {
it.isPlaying = false
}
}
player.setDataSource(item.path)
player.prepare()
player.start()
item.isPlaying = true
adapter.notifyDataSetChanged()
player.setOnCompletionListener {
player.reset()
adapter.notifyItemChanged(position)
item.isPlaying = false
}
}
private fun stopPlay() {
if (positionPlayItem == -1) {
return
}
player.reset()
adapter.items!![positionPlayItem].isPlaying = false
adapter.notifyItemChanged(positionPlayItem)
}
override fun onMultiSelectVoice(items: ArrayList<VoiceEntity>) {
stopPlay()
if (items.size == 0) {
layoutSelectItem.visibility = View.GONE
return
}
txtCounterSelect.text = String.format(getString(R.string.selected_number), items.size.toString())
setStatusBarColor(R.color.black)
if (layoutSelectItem.visibility == View.GONE) {
layoutSelectItem.visibility = View.VISIBLE
}
if (items.size > 1) {
imgShare.visibility = View.GONE
imgEdit.visibility = View.GONE
} else {
imgShare.visibility = View.VISIBLE
imgEdit.visibility = View.VISIBLE
}
imgCancelSelect.setOnClickListener {
resetData()
}
imgEdit.setOnClickListener {
edit(items.first())
}
imgShare.setOnClickListener {
if (items.isEmpty()) {
return@setOnClickListener
}
shareVoice(this, items[0].path)
}
imgDelete.setOnClickListener {
val alertDialog = AlertDialog.Builder(
supportFragmentManager,
getString(R.string.note), getString(R.string.do_you_sure_delete)
)
alertDialog.setBtnNegative(getString(R.string.no), View.OnClickListener {
alertDialog.dialog!!.dismiss()
})
alertDialog.setBtnPositive(getString(R.string.yes), View.OnClickListener {
val ex = Executors.newSingleThreadExecutor()
items.forEach { item ->
viewModel.remove(item)
ex.execute { File(item.path).deleteOnExit() }
}
items.clear()
layoutSelectItem.visibility = View.GONE
setStatusBarColor(R.color.colorPrimaryDark)
alertDialog.dialog!!.dismissAllowingStateLoss()
})
alertDialog.build().show()
}
}
private fun resetData() {
adapter.itemsSelected.clear()
adapter.items?.forEach { item ->
item.statusSelect = false
}
adapter.notifyDataSetChanged()
layoutSelectItem.visibility = View.GONE
setStatusBarColor(R.color.colorPrimaryDark)
}
private fun edit(item: VoiceEntity) {
val bottomSheet = NameBottomSheet(supportFragmentManager)
bottomSheet.listener = object : NameBottomSheet.OnTitleListener {
override fun onTitle(title: String) {
item.title = title
viewModel.update(item)
resetData()
}
}
bottomSheet.item = item
bottomSheet.show()
}
override fun onBackPressed() {
if (layoutSelectItem.visibility == View.VISIBLE) {
resetData()
return
}
stopPlay()
super.onBackPressed()
}
}
适配器类代码：
class VoiceAdapter : AdapterRecyclerView<VoiceEntity>() {
var onItemClickListener: OnClickItemListener? = null
var itemsSelected: ArrayList<VoiceEntity> = ArrayList()
var listenerMultiSelect: OnMultiSelectVoiceListener? = null
override fun getItemLayout(viewType: Int): Int {
return R.layout.item_voice
}
override fun onBindView(
viewDataBinding: ViewDataBinding,
viewHolder: ItemViewHolder,
position: Int,
viewType: Int,
element: VoiceEntity
) {
val binding = viewDataBinding as ItemVoiceBinding
binding.txtTitle.text = element.title
binding.txtDate.text = element.date.toAgoTime(context!!)
binding.icPlay.setImageResource(if (element.isPlaying) R.drawable.ic_pause else R.drawable.ic_play)
binding.seekBar.max = element.duration / 60
val colorSelectItem =
ContextCompat.getColor(binding.rootLayout.context, R.color.color_background_select_item_recycler_view)
val color = if (element.statusSelect) colorSelectItem else Color.TRANSPARENT
binding.rootLayout.setBackgroundColor(color)
if (element.statusSelect) {
changeColorLight(binding)
} else {
changeColorDarker(binding)
}
if (element.isPlaying) {
binding.layoutPlaying.visibility = View.VISIBLE
binding.lottieLayer.playAnimation()
//TODO : change handled voice progressBar show
val t = object : Thread() {
override fun run() {
super.run()
for (i in 0..element.duration) {
Thread.sleep(60)
binding.seekBar.progress = i
if (!element.isPlaying) break
}
}
}
t.start()
} else {
binding.layoutPlaying.visibility = View.GONE
binding.lottieLayer.cancelAnimation()
}
binding.rootLayout.setOnClickListener {
if (itemsSelected.size > 0) {
val item = items!![viewHolder.adapterPosition]
if (itemsSelected.contains(item)) {
item.statusSelect = false
itemsSelected.remove(item)
binding.rootLayout.animatedColorBackgroundSelected(false)
listenerMultiSelect?.onMultiSelectVoice(itemsSelected)
changeColorDarker(binding)
return@setOnClickListener
}
item.statusSelect = true
itemsSelected.add(item)
binding.rootLayout.animatedColorBackgroundSelected()
listenerMultiSelect?.onMultiSelectVoice(itemsSelected)
changeColorLight(binding)
return@setOnClickListener
}
onItemClickListener?.onClickItem(element, position)!!
}
binding.rootLayout.setOnLongClickListener {
val item = items!![viewHolder.adapterPosition]
if (itemsSelected.contains(item)) {
item.statusSelect = false
itemsSelected.remove(item)
binding.rootLayout.animatedColorBackgroundSelected(false)
changeColorDarker(binding)
listenerMultiSelect?.onMultiSelectVoice(itemsSelected)
}
item.statusSelect = true
itemsSelected.add(item)
binding.rootLayout.animatedColorBackgroundSelected()
changeColorLight(binding)
listenerMultiSelect?.onMultiSelectVoice(itemsSelected)
true
}
}
private fun changeColorLight(binding: ItemVoiceBinding) {
binding.txtDate.setTextColor(ContextCompat.getColor(binding.root.context, R.color.color_subtitle_light))
binding.txtTitle.setTextColor(ContextCompat.getColor(binding.root.context, R.color.color_title_light))
}
private fun changeColorDarker(binding: ItemVoiceBinding) {
binding.txtDate.setTextColor(ContextCompat.getColor(binding.root.context, R.color.color_subtitle))
binding.txtTitle.setTextColor(ContextCompat.getColor(binding.root.context, R.color.color_title))
}
interface OnClickItemListener {
fun onClickItem(item: VoiceEntity, position: Int)
}
}
github repository（开源项目）