kotlin

问题 I'm trying to convert documents to objects from Firestore, but when I create my data class , I dont know how to initialize the GeoPoint with default values as it needs to be declared for an empty constructor data class MapObj(val geopoint:Geopoint) //--> how to initialize it to get an empty constructor The problem relies on this line val obj = snapshot.toObject(MapObj::class.java) Thanks 回答1: The problem is that the Firestore SDK isn't finding a default, no argument constructor for MapObj.

问题 I'm trying to convert documents to objects from Firestore, but when I create my data class , I dont know how to initialize the GeoPoint with default values as it needs to be declared for an empty constructor data class MapObj(val geopoint:Geopoint) //--> how to initialize it to get an empty constructor The problem relies on this line val obj = snapshot.toObject(MapObj::class.java) Thanks 回答1: The problem is that the Firestore SDK isn't finding a default, no argument constructor for MapObj.

问题 I'm trying to convert documents to objects from Firestore, but when I create my data class , I dont know how to initialize the GeoPoint with default values as it needs to be declared for an empty constructor data class MapObj(val geopoint:Geopoint) //--> how to initialize it to get an empty constructor The problem relies on this line val obj = snapshot.toObject(MapObj::class.java) Thanks 回答1: The problem is that the Firestore SDK isn't finding a default, no argument constructor for MapObj.

问题 I'm trying to convert documents to objects from Firestore, but when I create my data class , I dont know how to initialize the GeoPoint with default values as it needs to be declared for an empty constructor data class MapObj(val geopoint:Geopoint) //--> how to initialize it to get an empty constructor The problem relies on this line val obj = snapshot.toObject(MapObj::class.java) Thanks 回答1: The problem is that the Firestore SDK isn't finding a default, no argument constructor for MapObj.

问题 How can I return a value after a callback in kotlin, I tried using Thread.sleep but it doesn't work fun searchColorFromAPI(): Colors { val service: RetrofitService = ServiceGenerator.createService(RetrofitService::class.java) val result: MutableList<String> = arrayListOf() val call: Call<Colors?>? = service.unityConverter(result) call?.enqueue(object : Callback<Colors?> { override fun onResponse(call: Call<Colors?>?, response: Response<Colors?>) { //switchProgressVisibility() if (response

问题 How can I return a value after a callback in kotlin, I tried using Thread.sleep but it doesn't work fun searchColorFromAPI(): Colors { val service: RetrofitService = ServiceGenerator.createService(RetrofitService::class.java) val result: MutableList<String> = arrayListOf() val call: Call<Colors?>? = service.unityConverter(result) call?.enqueue(object : Callback<Colors?> { override fun onResponse(call: Call<Colors?>?, response: Response<Colors?>) { //switchProgressVisibility() if (response

问题 I got an error. Like this : Error 1 : Platform declaration clash: The following declarations have the same JVM signature (getData()Ljava/lang/Object;): fun (): I defined in typeErasure2 fun getData(): I defined in typeErasure2 Error 2 : Platform declaration clash: The following declarations have the same JVM signature (getData()Ljava/lang/Object;): fun (): I defined in typeErasure2 fun getData(): I defined in typeErasure2 fun main(args : Array<String>){ var te = typeErasure("Jennie") println

问题 I'm facing a similar issue like this. I assume that Hilt is not able to invoke my BroadcastReceiver and I really don't have a clue how to make it work. I tried with the solution provided. The code runs smoothly, but still the BroadcastReceiver won't get invoked. This is what I did so far: AndroidManifest.xml <receiver android:name=".receiver.BatteryLevelReceiver"> <intent-filter> <action android:name="android.intent.action.BATTERY_LOW" /> <action android:name="android.intent.action.BATTERY

问题 I try "kotlin - spring boot 2 - jpa".I just started to study spring-boot. I have model, repository and app files. I`m use start.spring.io for starting.I’ve seen examples with web, but I don’t need a web. I have error during compilation. Why ? How can I fix this error? 2018-12-21 13:26:02.732 INFO 28188 --- [ main] org.hibernate.dialect.Dialect : HHH000400: Using dialect: org.hibernate.dialect.PostgreSQL95Dialect 2018-12-21 13:26:02.923 INFO 28188 --- [ main] o.h.e.j.e.i.LobCreatorBuilderImpl

问题 I want to get my server time in Firebase Firestore so I can use it for my countdown logic. I can't find anywhere and mostly they suggest to use FiedValue.serverTimeStamp or ServerValue.TIMESTAMP which is both are used to save data. I don't want to save data I just want to get the server time. Is there a static way like FirebaseFirestore.getInstance().getServerTime() ? 回答1: As per said by the @Doug there is no way of getting just only time from Firebase. However there are many round-ways for