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Question

In my recycler view I show friends list but for some reason there is a gap above it and i cant for the life of me get rid of it, im uusing android studios “navigation” project so it already came with a navigation bar, i should have just implemented one myself this never happened before.

package com.pphltd.chatlink.ui.friends

import android.annotation.SuppressLint
import android.os.Bundle
import android.util.Log
import android.view.Gravity
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.widget.Button
import android.widget.EditText
import android.widget.PopupWindow
import androidx.fragment.app.Fragment
import androidx.recyclerview.widget.LinearLayoutManager
import androidx.recyclerview.widget.RecyclerView
import com.pphltd.chatlink.R
import com.pphltd.chatlink.WebSocketClient
import com.pphltd.chatlink.SharedPreferencesUtil
import com.pphltd.chatlink.databinding.FragmentFriendsBinding
import com.pphltd.chatlink.ui.conversation.ConversationActivity
import org.json.JSONArray
import org.json.JSONException
import org.json.JSONObject

class FriendsFragment : Fragment() {

    private lateinit var friendsRecyclerView: RecyclerView
    private lateinit var friendsAdapter: FriendsAdapter
    private val friendsList: MutableList<String> = mutableListOf()

    private var _binding: FragmentFriendsBinding? = null
    private val binding get() = _binding!!

    private var popupWindow: PopupWindow? = null

    override fun onCreateView(
        inflater: LayoutInflater, container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View {
        _binding = FragmentFriendsBinding.inflate(inflater, container, false)
        val view = binding.root

        friendsRecyclerView = binding.friendsRecyclerView
        friendsRecyclerView.layoutManager = LinearLayoutManager(requireContext())
        friendsAdapter = FriendsAdapter(friendsList, object : FriendsAdapter.OnItemClickListener {
            override fun onItemClick(friend: String) {
                startConversation(friend)
            }
        })
        friendsRecyclerView.adapter = friendsAdapter

        // Set up add friend button click listener
        val addFriendButton: Button = binding.addFriendButton
        addFriendButton.setOnClickListener {
            showAddFriendPopup()
        }

        // Set up WebSocket message listener
        WebSocketClient.WebSocketSingleton.webSocketClient.setMessageListener { message ->
            onMessageReceived(message)
        }

        // Send getfriendslist message when fragment is created or resumed
        getFriendsList()

        return view
    }

    override fun onResume() {
        super.onResume()
        // Ensure getfriendslist message is sent when fragment is resumed
        getFriendsList()
    }

    private fun getFriendsList() {
        // Retrieve username from SharedPreferences
        val username = SharedPreferencesUtil.getUsername(requireContext())

        // Ensure username is not null before constructing the JSON message
        if (!username.isNullOrEmpty()) {
            // Construct JSON message for friends request
            val jsonMessage = "{ "type": "getfriendslist", "username": "$username" }"
            WebSocketClient.WebSocketSingleton.webSocketClient.send(jsonMessage)
        } else {
            Log.d("WebFriendsList", "Username is null or empty")
        }
    }

    private fun handleFriendsList(friendsArray: JSONArray?) {
        if (friendsArray == null) {
            Log.d("WebSocket", "Received null or missing friends array")
            // Optionally handle this case, e.g., show a message or do nothing
            return
        }

        val friends = mutableListOf<String>()
        for (i in 0 until friendsArray.length()) {
            val friend = friendsArray.optString(i)
            if (!friend.isNullOrEmpty()) {
                friends.add(friend)
            }
        }
        updateFriendsList(friends)

        // Save the friends list to SharedPreferences
        SharedPreferencesUtil.saveFriendsList(requireContext(), friendsArray)
    }

    private fun showAddFriendPopup() {
        // Inflate the popup view
        val popupView = layoutInflater.inflate(R.layout.popup_add_friend, null)

        // Initialize a new instance of PopupWindow
        popupWindow = PopupWindow(
            popupView,
            ViewGroup.LayoutParams.WRAP_CONTENT,
            ViewGroup.LayoutParams.WRAP_CONTENT,
            true
        )

        // Set up UI elements in the popup view
        val friendUsernameEditText: EditText = popupView.findViewById(R.id.friendUsernameEditText)
        val submitButton: Button = popupView.findViewById(R.id.submitButton)

        // Set click listener for submit button
        submitButton.setOnClickListener {
            val friendUsername = friendUsernameEditText.text.toString().trim()
            if (friendUsername.isNotEmpty()) {
                // Close the popup window
                popupWindow?.dismiss()

                // Retrieve username from SharedPreferences
                val username = SharedPreferencesUtil.getUsername(requireContext())
                if (!username.isNullOrEmpty()) {
                    addFriend(username, friendUsername)
                } else {
                    Log.d("WebFriendsList", "Username is null or empty")
                }
            } else {
                // Optionally handle empty input case
            }
        }

        // Show the popup window
        popupWindow?.showAtLocation(binding.root, Gravity.CENTER, 0, 0)
    }

    private fun addFriend(username: String, friendName: String) {
        try {
            // Construct JSON message for adding a friend request
            val jsonMessage = """
                { "type": "addfriend", "username": "$username", "friend": "$friendName" }
            """.trimIndent()
            WebSocketClient.WebSocketSingleton.webSocketClient.send(jsonMessage)
        } catch (e: Exception) {
            Log.e("WebSocket", "Error sending add friend request", e)
        }
    }

    private fun onMessageReceived(message: String) {
        try {
            val json = JSONObject(message)
            when (val messageType = json.getString("type")) {
                "friendslist" -> {
                    val friendsArray = json.optJSONArray("friends")
                    handleFriendsList(friendsArray)
                }
                "friend_added" -> {
                    val friendName = json.getString("friend")
                    Log.d("WebSocket", "Friend added: $friendName")
                    // Optionally trigger a refresh of friends list or UI update
                    getFriendsList() // Update friends list after adding a friend
                }
                "error" -> {
                    val errorMessage = json.getString("message")
                    Log.d("WebSocket", "Error message from server: $errorMessage")
                    // Handle error message display or any other action as needed
                }
                else -> {
                    Log.d("WebSocket", "Unknown message type: $messageType")
                }
            }
        } catch (e: JSONException) {
            Log.e("WebSocket", "Error parsing JSON message: $message", e)
        }
    }

    private fun updateFriendsList(newFriends: List<String>) {
        friendsList.clear()
        friendsList.addAll(newFriends)
        friendsAdapter.notifyDataSetChanged()
    }

    private fun startConversation(friendUsername: String) {
        val username = SharedPreferencesUtil.getUsername(requireContext())
        if (username != null && friendUsername.isNotEmpty()) {
            ConversationActivity.start(requireContext(), username, friendUsername)
        } else {
            Log.e("FriendsFragment", "Error starting conversation: username or friendUsername is empty")
        }
    }

    override fun onDestroyView() {
        super.onDestroyView()
        _binding = null
        popupWindow?.dismiss() // Dismiss popup window if fragment is destroyed
    }
}

package com.pphltd.chatlink.ui.friends

import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.widget.TextView
import androidx.recyclerview.widget.RecyclerView
import com.pphltd.chatlink.R

class FriendsAdapter(
    private val friends: List<String>,
    private val itemClickListener: OnItemClickListener
) : RecyclerView.Adapter<FriendsAdapter.FriendViewHolder>() {

    interface OnItemClickListener {
        fun onItemClick(friend: String)
    }

    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): FriendViewHolder {
        val view = LayoutInflater.from(parent.context).inflate(R.layout.item_friend, parent, false)
        return FriendViewHolder(view)
    }

    override fun onBindViewHolder(holder: FriendViewHolder, position: Int) {
        val friend = friends[position]
        holder.bind(friend)
        holder.itemView.setOnClickListener {
            itemClickListener.onItemClick(friend)
        }
    }

    override fun getItemCount(): Int {
        return friends.size
    }

    class FriendViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView) {

        fun bind(friend: String) {
            itemView.findViewById<TextView>(R.id.friendNameTextView).text = friend
        }
    }
}

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <!-- RecyclerView -->
    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/friendsRecyclerView"
        android:layout_width="0dp"
        android:layout_height="0dp"
        app:layout_constraintBottom_toTopOf="@+id/addFriendButton"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <!-- Add Friend Button -->
    <Button
        android:id="@+id/addFriendButton"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_margin="16dp"
        android:text="@string/addfriendplusbutton"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.5"
        app:layout_constraintStart_toStartOf="parent" />

</androidx.constraintlayout.widget.ConstraintLayout>

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:background="#F3F2F2"
    android:orientation="vertical"
    android:padding="16dp">

    <TextView
        android:id="@+id/friendNameTextView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Friend Name"
        android:textColor="@android:color/black"
        android:textSize="18sp" />


</LinearLayout>

I have tried all the other posts about the same issue, i have tried removing any margins, using wrap content, even tried using 0dp so it fills the view. And finally i even tried a negative margin which actually increased the gap for some reason.

All i want is the gap gone, if i have to ill copy and paste my code into a new project and implement my own navigation bar like i did in another app that worked fine.

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Danh mục

Gap above recycler view (other posts didnt help)