privatefundoAddView(context: Context, view: View) { when (context) { is Activity -> context.setContentView(view) is ContextWrapper -> doAddView(context.baseContext, view) else -> throw IllegalStateException("Context is not an Activity, can't set content view") } }
毫无疑问，今年的主题依然是 AI。RISC 发明人、图领奖得主 John Hennsessy 会做主题为《The future of computing》的 Keynote。Fei-Fei Li 也会露面，她的 Keynote 是《Building the future of artificial intelligence for everyone》，值得期待。
TensorFlow 大大降低了 Machine Learning 的入门门槛，基于它，没有读过 PhD 的人也能够做一些 AI 相关的工作。
classRequest( val method: Method, val path: String, val url: URL, var type: Type = Type.REQUEST, val headers: MutableMap<String, String> = mutableMapOf(), val parameters: List<Pair<String, Any?>> = listOf(), var name: String = "", val names: MutableList<String> = mutableListOf(), val mediaTypes: MutableList<String> = mutableListOf(), var timeoutInMillisecond: Int = 15000, var timeoutReadInMillisecond: Int = timeoutInMillisecond) : Fuel.RequestConvertible
classEncoding( val httpMethod: Method, val urlString: String, val requestType: Request.Type = Request.Type.REQUEST, val baseUrlString: String? = null, val parameters: List<Pair<String, Any?>>? = null) : Fuel.RequestConvertible
classResponse( val url: URL, val statusCode: Int = -1, val responseMessage: String = "", val headers: Map<String, List<String>> = emptyMap(), val contentLength: Long = 0L, val dataStream: InputStream = ByteArrayInputStream(ByteArray(0))
/** * Accumulates value starting with [initial] value and applying [operation] from right to left to each element and current accumulator value. */ publicinlinefun<T, R> List<T>.foldRight(initial: R, operation: (T, acc: R) -> R): R { var accumulator = initial if (!isEmpty()) { val iterator = listIterator(size) // 让迭代器指向最后一个元素的末尾 while (iterator.hasPrevious()) { accumulator = operation(iterator.previous(), accumulator) } } return accumulator }
// Evolve the value and send to the next chain original.let { println("The original String is $it") // "abc" it.reversed() // evolve it as parameter to send to next let }.let { println("The reverse String is $it") // "cba" it.length // can be evolve to other type }.let { println("The length of the String is $it") // 3 }
// Wrong // Same value is sent in the chain (printed answer is wrong) original.also { println("The original String is $it") // "abc" it.reversed() // even if we evolve it, it is useless }.also { println("The reverse String is ${it}") // "abc" it.length // even if we evolve it, it is useless }.also { println("The length of the String is ${it}") // "abc" }
// Corrected for also (i.e. manipulate as original string // Same value is sent in the chain original.also { println("The original String is $it") // "abc" }.also { println("The reverse String is ${it.reversed()}") // "cba" }.also { println("The length of the String is ${it.length}") // 3 }