Map中的键是keyCode，值是一个lambda。如果要用Java实现，估计要定义一个接口，会麻烦一丢丢，没错.....
Concise way to create an array of values not found in a complex nested objects and arrays What would a concise way of creating an array of ids where none of the values of the key "number" in array "numbers" in any object of the mainArray array equal the string number 33... ...
adapter = wallAdapter return view } fun initializeView() { wall_recycler = view!!.findViewById(R.id.wall_recycler_id) as RecyclerView mainlayout = view!!.findViewById(R.id.mainlayout) as LinearLayout no_result_found_layout = view!!.findViewById(R.id.no_result_found_layout) as RelativeL...
在片段的onCreateView中(例如，如果文本视图的id是textView)
classCat:Animal()valcatShop = PetShop(Cat())valappleShop = PetShop(Apple())// 👆 报错:Type mismatch. Required: Animal? Found: Apple 很明显,Apple并不是Animal的子类,当然不满足PetShop泛型类型的上界约束。 那...可以设置多个上界约束么? 当然...
(oldText: String, newText: String) { text = "Text is changed: $oldText -> $newText" } } class TextView { val listeners = mutableListOf<TextChangedListener>() var text: String by Delegates.observable("<empty>") { _, old, new -> listeners.forEach { it.onTextChanged(old, new) ...
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《Kotlin for android developers》中文版翻译 错别字、病句、翻译错误等问题可以提issues。请说明错误原因。 写在前面 学习通过Kotlin语言来简单地开发android应用。 关于本书 在这本书中,我会使用Kotlin作为主要的语言来开发一个android应用。方式是通过开发一个应用来学习这门语言,而不是根据传统的结构来学习。我会...
resultTextView = findViewById(R.id.similar_word_value) findSimilarWords = findViewById(R.id.check_word_similarity) findSimilarWords!!.setOnClickListener(View.OnClickListener { noOfSimilarWords() }) analyzer = UtilForAnalyzer.getAnalyzer() ...
Thanks to Kotlin Android Extensions, we don’t have to use findViewById for each XML view. In the above code, we are creating asingleton classusing theobjectkeyword. We are declaring an inline higher-order function named editMe(), which holds the logic for the edit operation. We’ve crea...