Got an issue at line 17 of MainActivity while working on Ijaiswalshiv…

…am#28

TalkIn/app/build.gradle

@@ -39,7 +39,10 @@ android {
 }
 
 dependencies {
-
+    implementation "androidx.lifecycle:lifecycle-viewmodel-ktx:2.6.1"
+    implementation "androidx.lifecycle:lifecycle-livedata-ktx:2.6.1"
+    implementation 'androidx.activity:activity-ktx'
+    implementation 'androidx.lifecycle:lifecycle-viewmodel-ktx'
     implementation 'androidx.core:core-ktx:1.13.1'
     implementation 'androidx.appcompat:appcompat:1.6.1'
     implementation 'com.google.android.material:material:1.12.0'

TalkIn/app/src/main/java/com/example/talk_in/MainActivity.kt

@@ -4,69 +4,47 @@ import android.content.Intent
 import android.os.Bundle
 import android.util.Log
 import android.widget.Toast
+import androidx.activity.viewModels
 import androidx.appcompat.app.AppCompatActivity
 import androidx.appcompat.widget.SearchView
 import androidx.recyclerview.widget.LinearLayoutManager
+import com.example.talk_in.MainViewModel
 import com.example.talk_in.databinding.ActivityMainBinding
-import com.google.firebase.auth.FirebaseAuth
-import com.google.firebase.database.*
-
 
 class MainActivity : AppCompatActivity() {
 
     private lateinit var binding: ActivityMainBinding
-    private lateinit var userList: ArrayList<User>
+    private val mainViewModel: MainViewModel by viewModels()
     private lateinit var adapter: UserAdapter
-    private lateinit var tempUserList: ArrayList<User>
     private lateinit var tempAdapter: UserAdapter
-    private lateinit var mAuth: FirebaseAuth
-    private lateinit var mDbRef: DatabaseReference
 
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         binding = ActivityMainBinding.inflate(layoutInflater)
         setContentView(binding.root)
 
-        mAuth = FirebaseAuth.getInstance()
-        mDbRef = FirebaseDatabase.getInstance().getReference()
-
-        userList = ArrayList()
-        adapter = UserAdapter(this, userList)
-
-        tempUserList = ArrayList()
-        tempAdapter = UserAdapter(this, tempUserList)
+        adapter = UserAdapter(this, ArrayList())
+        tempAdapter = UserAdapter(this, ArrayList())
 
         binding.userRecyclerView.layoutManager = LinearLayoutManager(this)
         binding.userRecyclerView.adapter = adapter
 
-        mDbRef.child("user").addValueEventListener(object : ValueEventListener {
-            override fun onDataChange(snapshot: DataSnapshot) {
-                userList.clear()
-                for (postSnapshot in snapshot.children) {
-                    val currentUser = postSnapshot.getValue(User::class.java)
-                    if (currentUser != null && mAuth.currentUser?.uid != currentUser.uid && currentUser.verified == true) {
-                        userList.add(currentUser)
-                    }
-                }
-                adapter.notifyDataSetChanged()
-            }
-
-            override fun onCancelled(error: DatabaseError) {
-                // Handle possible errors.
-            }
-        })
+        mainViewModel.userList.observe(this) { users ->
+            adapter.updateUsers(users)
+        }
 
         binding.userSearchBar.setOnQueryTextListener(object : SearchView.OnQueryTextListener {
-            override fun onQueryTextSubmit(query: String): Boolean {
-                return false
-            }
-
             override fun onQueryTextChange(newText: String): Boolean {
-                filterList(newText)
+                val filteredList = mainViewModel.filterList(newText)
+                adapter.updateUsers(filteredList) // Update the main adapter directly
+                if (filteredList.isEmpty()) {
+                    Toast.makeText(this@MainActivity, "No data found", Toast.LENGTH_SHORT).show()
+                }
                 return true
             }
         })
 
+
         binding.bottomNavigation.setOnItemSelectedListener { item ->
             when (item.itemId) {
                 R.id.menu_chat -> true
@@ -83,22 +61,6 @@ class MainActivity : AppCompatActivity() {
         }
     }
 
-    private fun filterList(text: String) {
-        tempUserList.clear()
-        binding.userRecyclerView.adapter = tempAdapter
-        for (user in userList) {
-            if (user.name?.startsWith(text, ignoreCase = true) == true) {
-                tempUserList.add(user)
-            }
-        }
-        if (tempUserList.isEmpty()) {
-            tempAdapter.notifyDataSetChanged()
-            Toast.makeText(this@MainActivity, "No data found", Toast.LENGTH_SHORT).show()
-        } else {
-            tempAdapter.notifyDataSetChanged()
-        }
-    }
-
     override fun onBackPressed() {
         super.onBackPressed()
         val intent = Intent(Intent.ACTION_MAIN)

TalkIn/app/src/main/java/com/example/talk_in/MainViewModel.kt

@@ -0,0 +1,50 @@
+package com.example.talk_in
+
+import android.widget.Toast
+import androidx.lifecycle.LiveData
+import androidx.lifecycle.MutableLiveData
+import com.example.talk_in.databinding.ActivityMainBinding
+import com.google.firebase.auth.FirebaseAuth
+import com.google.firebase.database.DataSnapshot
+import com.google.firebase.database.DatabaseError
+import com.google.firebase.database.DatabaseReference
+import com.google.firebase.database.FirebaseDatabase
+import com.google.firebase.database.ValueEventListener
+
+class MainViewModel {
+    private val _userList = MutableLiveData<List<User>>()
+    val userList: LiveData<List<User>> get()=_userList
+
+    private val mAuth: FirebaseAuth=FirebaseAuth.getInstance()
+    private val mDbRef: DatabaseReference=FirebaseDatabase.getInstance().reference
+
+    init {
+        fetchUsers()
+    }
+
+    // Firebase Fetch
+
+    private fun fetchUsers(){
+        mDbRef.child("user").addValueEventListener(object :ValueEventListener{
+            override fun onDataChange(snapshot: DataSnapshot) {
+                val tempList = mutableListOf<User>()
+                for (postSnapshot in snapshot.children){
+                    val currentUser =postSnapshot.getValue(User::class.java)
+                    if (currentUser != null && mAuth.currentUser?.uid !=currentUser.uid&&currentUser.verified==true){
+                        tempList.add(currentUser)
+                    }
+                }
+                _userList.value=tempList
+            }
+
+            override fun onCancelled(error: DatabaseError) {
+
+            }
+        })
+
+    }
+    fun filterList(query: String):List<User>{
+        return _userList.value?.filter { it.name?.startsWith(query,ignoreCase = true)==true }?: emptyList()
+    }
+
+}

TalkIn/app/src/main/java/com/example/talk_in/UserAdapter.kt

@@ -21,8 +21,9 @@ import com.google.firebase.storage.StorageReference
 import java.io.File
 import java.io.IOException
 
-class UserAdapter(val context: Context, val userList: ArrayList<User>) :
+class UserAdapter(val context: Context, private var userList: ArrayList<User>) :
     RecyclerView.Adapter<UserAdapter.UserViewHolder>() {
+
     private lateinit var mAuth: FirebaseAuth
     private lateinit var storageReference: StorageReference
     private lateinit var mDbRef: DatabaseReference
@@ -61,14 +62,13 @@ class UserAdapter(val context: Context, val userList: ArrayList<User>) :
                 override fun onDataChange(snapshot: DataSnapshot) {
                     if (snapshot.exists()) {
                         val lastMessage = snapshot.children.first().getValue(Message::class.java)
-                        holder.txt_last_message.setText(lastMessage?.message.toString())
-                    }
-                    else{
+                        holder.txt_last_message.text = lastMessage?.message.toString()
+                    } else {
                         var aboutUser = currentUser.aboutMe.toString().trim()
-                        if (aboutUser.length > 30){
+                        if (aboutUser.length > 30) {
                             aboutUser = aboutUser.substring(0, minOf(currentUser.aboutMe.toString().length, 30)).trim() + "..."
                         }
-                        holder.txt_last_message.setText(aboutUser)
+                        holder.txt_last_message.text = aboutUser
                     }
                 }
 
@@ -83,9 +83,9 @@ class UserAdapter(val context: Context, val userList: ArrayList<User>) :
     }
 
     class UserViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView) {
-        val textName = itemView.findViewById<TextView>(R.id.txt_name)
-        val userprofileImage = itemView.findViewById<ImageView>(R.id.user_profile_image)
-        val txt_last_message = itemView.findViewById<TextView>(R.id.txt_last_message)
+        val textName: TextView = itemView.findViewById(R.id.txt_name)
+        val userprofileImage: ImageView = itemView.findViewById(R.id.user_profile_image)
+        val txt_last_message: TextView = itemView.findViewById(R.id.txt_last_message)
     }
 
     private fun setProfileImage(uid: String, holder: UserViewHolder) {
@@ -97,11 +97,18 @@ class UserAdapter(val context: Context, val userList: ArrayList<User>) :
                 .addOnSuccessListener {
                     val bitmap = BitmapFactory.decodeFile(localFile.absolutePath)
                     holder.userprofileImage.setImageBitmap(bitmap)
-                }.addOnFailureListener{
+                }.addOnFailureListener {
                     holder.userprofileImage.setImageResource(R.drawable.user_profile_icon)
                 }
         } catch (e: IOException) {
             e.printStackTrace()
         }
     }
-}
+
+    // Add updateUsers method
+    fun updateUsers(newUserList: List<User>) {
+        userList.clear()
+        userList.addAll(newUserList)
+        notifyDataSetChanged()
+    }
+}