我正在处理一个API,它返回XML如下所示: 1000000714 DL 11 Jul, 2017, 17:40 我正在使用jackson的XML映射器。 我试图为此写一个POJO对象,但这是行不通的。 如何处理types和名称等元素的属性? 你能举例说明吗?
我需要添加具有+/-function的新按钮。 如果用户第一次点击该按钮,则应该返回值 – >“ – ”(例如=> -123),如果用户再次单击该值,则应该删除( – > 123)。 计算器中的function类似于+/-按钮。 这是我的代码 Activity.kt文件 package com.tripbegins.calculator import android.support.v7.app.AppCompatActivity import android.os.Bundle import android.view.View import android.widget.Button import com.tripbegins.calculator.R.id.* import kotlinx.android.synthetic.main.activity_main.* class MainActivity : AppCompatActivity() { override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_main) } var emptyText = true fun numberEvents(view: View) { var checkButton:Boolean = false if(emptyText){ viewResult.setText(“”) } […]
我是新来的反应式编程。 我期待看到 test provider started Beat 1000 Beat 2000 在日志中,但是只有test provider started并且没有Beat或on complete消息。 看起来我想念一些东西 @Service class ProviderService { @PostConstruct fun start(){ val hb: Flux = Flux.interval(Duration.ofSeconds(1)).map { HeartBeat(it) } val provider = Provider(“test”, hb) } } //////////////////////// open class Provider(name: String, heartBests: Flux) { companion object { val log = LoggerFactory.getLogger(Provider::class.java)!! } init { log.info(“$name […]
考虑到Kotlin的属性 ,这个概念对我来说有些新颖,所以我很好奇,说私有property是一个field (实例variables)是合理的吗?
我无法在.toChar()之后使用Kotlin中的.toChar() readLine()!! 像这种情况一样 //An Array Of Characters var CharAr= Array(5){‘ ‘} for(i in 0..4){ println(“Please Enter The character Number ${i+1}”) CharAr[i]= readLine()!!.toChar() } 甚至在这种情况下 //Normal readLine() var CharacterNum1:Char println(“Please Enter a Character”) CharacterNum1= readLine()!!.toChar() 感谢您的帮助 :)
每次解雇后如何重新显示同一个对话框? 我的代码(在Kotlin): val alertDialog = AlertDialog.Builder(this) alertDialog.setMessage(getString(R.string.alert_dialog_main_activity)) val editText = EditText(this) editText.inputType = InputType.TYPE_CLASS_PHONE alertDialog.run { setView(editText) setOnDismissListener { TODO( “Re-show dialog” } setPositiveButton(“Done”, { dialogInterface, i -> run { toast(editText.text.toString()) PreferenceManager.getDefaultSharedPreferences(applicationContext).edit().putInt(“phoneNumber”, editText.text.toString().toInt()).commit() } }) show() } 答案也可以在Java中。
从String或File对象获取文件名的最好方法是什么,删除扩展名?
比方说,有一个类的主要构造函数有参数param ,我想解决(链接到实际的参数)在类的文档块。 /** Class A does something using [param]. @constructor constructs A with [param]. */ class A (param: Int) 但是,题注param被IDE强调说它不能解析符号param 。
我认为问题标题有点混乱,但是我找不到更准确的方式来说这个。 我只需要一个简单的代码示例来告诉你我想要什么。 我有: // code 1 interface A { A bla(); } class B implements A { @Override public B bla() { return this; } } class C implements A { @Override public C bla() { return this; } } 但实际上,这个代码也会编译(diff:查看返回types声明): // code 2 interface A { A bla(); } class B implements A { […]
不时编译项目时,我得到这个错误: Error:java.lang.UnsupportedOperationException: Unresolved local class: com/myproject/activities/BaseActivity$broadcastReceiver$1 at org.jetbrains.kotlin.descriptors.NotFoundClasses$classes$1.invoke(NotFoundClasses.kt:44) at org.jetbrains.kotlin.descriptors.NotFoundClasses$classes$1.invoke(NotFoundClasses.kt:32) at org.jetbrains.kotlin.storage.LockBasedStorageManager$MapBasedMemoizedFunction.invoke(LockBasedStorageManager.java:408) at org.jetbrains.kotlin.storage.LockBasedStorageManager$MapBasedMemoizedFunctionToNotNull.invoke(LockBasedStorageManager.java:483) at org.jetbrains.kotlin.descriptors.NotFoundClasses.getClass(NotFoundClasses.kt:101) at org.jetbrains.kotlin.serialization.deserialization.TypeDeserializer$typeConstructor$1.invoke(TypeDeserializer.kt:120) at org.jetbrains.kotlin.serialization.deserialization.TypeDeserializer.typeConstructor(TypeDeserializer.kt:124) at org.jetbrains.kotlin.serialization.deserialization.TypeDeserializer.simpleType(TypeDeserializer.kt:82) at org.jetbrains.kotlin.serialization.deserialization.TypeDeserializer.type(TypeDeserializer.kt:70) at org.jetbrains.kotlin.serialization.deserialization.TypeDeserializer.type$default(TypeDeserializer.kt:62) at org.jetbrains.kotlin.serialization.deserialization.MemberDeserializer.loadProperty(MemberDeserializer.kt:67) at org.jetbrains.kotlin.serialization.deserialization.descriptors.DeserializedMemberScope.computeProperties(DeserializedMemberScope.kt:123) at org.jetbrains.kotlin.serialization.deserialization.descriptors.DeserializedMemberScope.access$computeProperties(DeserializedMemberScope.kt:35) at org.jetbrains.kotlin.serialization.deserialization.descriptors.DeserializedMemberScope$properties$1.invoke(DeserializedMemberScope.kt:61) at org.jetbrains.kotlin.serialization.deserialization.descriptors.DeserializedMemberScope$properties$1.invoke(DeserializedMemberScope.kt:35) at org.jetbrains.kotlin.storage.LockBasedStorageManager$MapBasedMemoizedFunction.invoke(LockBasedStorageManager.java:408) at org.jetbrains.kotlin.storage.LockBasedStorageManager$MapBasedMemoizedFunctionToNotNull.invoke(LockBasedStorageManager.java:483) at org.jetbrains.kotlin.serialization.deserialization.descriptors.DeserializedMemberScope.getContributedVariables(DeserializedMemberScope.kt:137) at org.jetbrains.kotlin.serialization.deserialization.descriptors.DeserializedClassDescriptor$DeserializedClassMemberScope.getContributedVariables(DeserializedClassDescriptor.kt:232) at org.jetbrains.kotlin.serialization.deserialization.descriptors.DeserializedClassDescriptor$DeserializedClassMemberScope.computeNonDeclaredProperties(DeserializedClassDescriptor.kt:252) at org.jetbrains.kotlin.serialization.deserialization.descriptors.DeserializedMemberScope.computeProperties(DeserializedMemberScope.kt:124) at org.jetbrains.kotlin.serialization.deserialization.descriptors.DeserializedMemberScope.access$computeProperties(DeserializedMemberScope.kt:35) at org.jetbrains.kotlin.serialization.deserialization.descriptors.DeserializedMemberScope$properties$1.invoke(DeserializedMemberScope.kt:61) at org.jetbrains.kotlin.serialization.deserialization.descriptors.DeserializedMemberScope$properties$1.invoke(DeserializedMemberScope.kt:35) at […]