kotlin

问题 I am trying to populate my RecyclerView ViewHolder but I seem to be having difficulties. I think it may because of incorrect db reference but I am not quite sure what I am doing wrong. I have tried using the datasnapshot from childEventListener to retrieve the values from my firebase db and pass to the RecyclerView but unfortunately have not been successful private var mAuth: FirebaseAuth? = null private var mChatKey: String? = null private var mDatabase: DatabaseReference? = null private var

问题 I want to remove all occurrence of "attributeToRemove" in the following JSON: { "Item994": [ { "attributeToRemove": { "someItem": null }, "types": [ "type194", "type294" ], "p1": "SOS" } ], "Item99": [ { "attributeToRemove": { "someItem": null }, "types": [ "type19", "type29" ], "p1": "SOS" } ] } I tried using removeAll but I keep this Error: Type mismatch: inferred type is (JsonNode!) -> JsonNode! but (JsonNode!) -> Boolean was expected Can anyone suggest how to fix this? Here's my code:

问题 I am integrating FirebaseAuth into an Android app that I am building. I have successfully integrated firebase into the app by adding the SDK, downloading and adding the google-services.json file. The problem occurs when I try to Sign Up a new user. The user gets added to firebase console but I cannot retrieve the signed in user to update the name. This is the code from the fragment I am using it in. requireActivity().let { val user = authenticationService.signUpWithEmailAndPassword(email,

问题 I have following interfaces: interface UserRepository { fun role(codename: String): IO<Option<Role>> fun accessRights(roleId: Long): IO<List<AccessRight>> } Now trying to use it to compose effectfful operations like this: private fun retrieveRole(roleCodename: String): IO<Option<RoleTo>> = IO.fx { val role = userRepository.role(roleCodename).bind() role.map { r -> val ar = userRepository.accessRights(r.id).bind() RoleTo.of(r, ar) } } The code fails to compile on the second bind (call to

问题 I have a new Kotlin project in Eclipse (I installed the kotlin plugin). However this code: val a: Int = 10000 println("Your Int Value is "+a); causes this error: ERROR: Cannot access 'java.io.Serializable' which is a supertype of 'kotlin.String'. Check your module classpath for missing or conflicting dependencies. What is the source of this error? How can I fix it? I have seen the other posts on stackoverflow but they all talk about intellij and not Eclipse. 回答1: I got this error while using

问题 So, I'm using Kotlin extensions which is straightforward, but I can't get string from edittext here is my code: override fun onCreateDialog(savedInstanceState: Bundle?): Dialog { val v = activity.layoutInflater .inflate(R.layout.dialog_group, null) v.add_group_button.setOnClickListener(addListener) return AlertDialog.Builder(activity) .setView(v) .create() } private var addListener: View.OnClickListener = View.OnClickListener { val groupNameInput: String = view?.group_edit_text?.text.toString

问题 I'm stuck for days now trying to figure out what is wrong with my broadcast receiver and alarm manager , basically my broadcast receiver is not triggered when pushing a notification . **This is my broadcast receiver class class NotificationAlarmReceiver : BroadcastReceiver() { private lateinit var mAlarmManager : AlarmManager private lateinit var mPowerManager: PowerManager override fun onReceive(context: Context?, intent: Intent?) { mAlarmManager = context?.getSystemService(Context.ALARM

问题 I have a class/interface pair defined like this in Kotlin: @JsonDeserialize(`as` = SimpleEvent::class) interface Event { val organizationId: UUID val userId: UUID val eventTime: LocalDateTime val eventId: UUID @get:JsonAnyGetter @get:JsonAnySetter val details: Map<String, JsonNode> } data class SimpleEvent( override val organizationId: UUID, override val userId: UUID, override val eventTime: LocalDateTime, override val eventId: UUID, override val details: Map<String, JsonNode> ) : Event My

问题 I tried to share a multi-line text using the following code, but only the last line appears. val sharingIntent = Intent(Intent.ACTION_SEND) sharingIntent.setType("text/plain") sharingIntent.putExtra(android.content.Intent.EXTRA_TEXT, "Found this cool deal! Check it out.") sharingIntent.putExtra(android.content.Intent.EXTRA_TEXT, TITLE) sharingIntent.putExtra(android.content.Intent.EXTRA_TEXT, "MRP : $PRICE") sharingIntent.putExtra(android.content.Intent.EXTRA_TEXT, "Deal Price : $DEAL_PRICE")

问题 I tried to share a multi-line text using the following code, but only the last line appears. val sharingIntent = Intent(Intent.ACTION_SEND) sharingIntent.setType("text/plain") sharingIntent.putExtra(android.content.Intent.EXTRA_TEXT, "Found this cool deal! Check it out.") sharingIntent.putExtra(android.content.Intent.EXTRA_TEXT, TITLE) sharingIntent.putExtra(android.content.Intent.EXTRA_TEXT, "MRP : $PRICE") sharingIntent.putExtra(android.content.Intent.EXTRA_TEXT, "Deal Price : $DEAL_PRICE")