kotlin

问题 I created custom layout for preference in order to add new custom item to it. I add that layout with android:layout property. My custom layout looks like that: <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="wrap_content" android:minHeight="?android:attr/listPreferredItemHeightSmall" android:gravity="center_vertical" android

问题 Broadcast receiver mBroadcastReceiver = object : BroadcastReceiver() { override fun onReceive(context: Context, intent: Intent) { Log.i(TAG,"contact list populate broadcast") var action = intent.action Log.v("Action is ",action) when (action) { GetContactListFromServer -> { println("Get contact list") } } } } val filter = IntentFilter(GetContactListFromServer) this.registerReceiver(mBroadcastReceiver, filter) This is how I am sending broadcast val i = Intent(ContactListActivity.Obz

问题 This question is about fun() vs a lambda block definitions and scopes. i have tried define the expressions in two ways. Here is what i have tried: val myFunction = fun(){ println("i am in a function") } //but i also tried doing this: val myFunction = { println("i am in a lambda") } my problem is i do not know if they are equivalent and same thing ? 回答1: The differences are best described in https://kotlinlang.org/docs/reference/lambdas.html#anonymous-functions: Anonymous functions allow you

问题 In MainActivtiy , we use Glide to load URL image into imgSignature . When imgSignature clicked, a custom dialog pop out and it will display the image in imgSign . Our problem is when we clicked the done button in the custom dialog, the image inside imgSignature become empty and getting this toast message bgDrawable null . Why image in imgSignature will gone ? lateinit var signDialog: Dialog override fun onViewCreated(view: View, savedInstanceState: Bundle?) { super.onViewCreated(view,

问题 In MainActivtiy , we use Glide to load URL image into imgSignature . When imgSignature clicked, a custom dialog pop out and it will display the image in imgSign . Our problem is when we clicked the done button in the custom dialog, the image inside imgSignature become empty and getting this toast message bgDrawable null . Why image in imgSignature will gone ? lateinit var signDialog: Dialog override fun onViewCreated(view: View, savedInstanceState: Bundle?) { super.onViewCreated(view,

问题 I am using recyclerView to show data from firebase database and I want to handle clicks, Now the important part is that I want to know the number that was clicked in order to test google play in app billing before showing the next activity I mean user should click item number one then pay to see information number 1 and so on Any help, please ? //my adapter class MyAdapter( private val arrayList: ArrayList<Long> ) : RecyclerView.Adapter<MyAdapter.MyViewHolder>() { override fun

问题 I don't quite get how vert.x is applied for a webserver. The concept I know for webserver is the thread-based one. You start your webserver, which then is running. Then for every client that connects, you get a socket, which is then passed to its own thread handler. The thread handler then processes the tasks for this specific socket. So it is clearly defined which thread is doing the work for which socket. However for every socket you need a new thread, which is expensive in the long run for

问题 I don't quite get how vert.x is applied for a webserver. The concept I know for webserver is the thread-based one. You start your webserver, which then is running. Then for every client that connects, you get a socket, which is then passed to its own thread handler. The thread handler then processes the tasks for this specific socket. So it is clearly defined which thread is doing the work for which socket. However for every socket you need a new thread, which is expensive in the long run for

问题 I am trying to create a simple pokedex where you can keep track of how many pokemons you have collected. The trouble I am having is the checkbox in a recyclerview. I want to have the total which is currently at zero, go up for each checkbox checked. If unchecked the number will go down. The total number is simply just shown in a text view. Below is an image showing what I am trying to explain, in case I am not explaining it as clearly. Here is my code Adapter Class class MainAdapter(val

问题 My app is currently implemented with the Single activity approach (Using navigation architecture component with one main activity and several fragments). I am currently using a toolbar with a drawer. My app currently look like this: However in the modern google apps (Google photos, gmail etc..), Google has implemented a new way of navigating using a search field with an implemented drawer in it as shown below: I want to replace this toolbar with a search bar and the drawer menu exactly like