kotlinPractice

Kotlin Flow 应用技巧实践

一. 倒计时

 fun countDownCoroutines(total:Int,onTick:(Int)->Unit,onFinish:()->Unit,
                        scope: CoroutineScope = GlobalScope):Job{
    return flow{
        for (i in total downTo 0){
            emit(i)
            delay(1000)
        }
    }.flowOn(Dispatchers.Default)
        .onCompletion { onFinish.invoke() }
        .onEach { onTick.invoke(it) }
        .flowOn(Dispatchers.Main)
        .launchIn(scope)
}

二. Gson拓展

 inline fun <reified T> fromJson(json: String): T? {
     return try {
         val type = object : TypeToken<T>() {}.type
         return Gson().fromJson(json, type)
     } catch (e: Exception) {
         null
     }
 }

 fun Any.toJson():String{
     return Gson().toJson(this)
 }

三. 优化 App 搜索功能

      private val stateFlow = MutableStateFlow("")
      private fun searchFilter(str:String){
          stateFlow
              .debounce(400)
              .filter {
                  it.isNotEmpty()
              }
              .distinctUntilChanged()
              .flatMapLatest {
                  getFlowList(it)
              }
              .catch { print(it.message) }
              .flowOn(Dispatchers.Default)
              .onEach {
                  print(it.toString())
              }.flowOn(Dispatchers.Main)
              .launchIn(lifecycleScope)
      }

四. 防抖动处理

 inline fun View.setThrottleListener(delayMillis: Long = 1000L,crossinline onClick: () -> Unit) {
     this.setOnClickListener {
         this.isClickable = false
         onClick()
         this.postDelayed({
             this.isClickable = true
         }, delayMillis)
     }
 }

未完待续

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