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Android
Kotlin
i try to run my app and i get this

E/AndroidRuntime: FATAL EXCEPTION: main
    Process: com.example.intskot, PID: 12203
    com.google.firebase.database.DatabaseException: Found setter with invalid case-sensitive name: setPostId
        at com.google.firebase.database.core.utilities.encoding.CustomClassMapper$BeanMapper.<init>(CustomClassMapper.java:506)
        at com.google.firebase.database.core.utilities.encoding.CustomClassMapper.loadOrCreateBeanMapperForClass(CustomClassMapper.java:330)
        at com.google.firebase.database.core.utilities.encoding.CustomClassMapper.convertBean(CustomClassMapper.java:431)
        at com.google.firebase.database.core.utilities.encoding.CustomClassMapper.deserializeToClass(CustomClassMapper.java:232)
        at com.google.firebase.database.core.utilities.encoding.CustomClassMapper.convertToCustomClass(CustomClassMapper.java:80)
        at com.google.firebase.database.DataSnapshot.getValue(DataSnapshot.java:203)
        at com.example.intskot.fragments.NotificationsFragment$readNotifications$1.onDataChange(NotificationsFragment.kt:65)
        at com.google.firebase.database.core.ValueEventRegistration.fireEvent(ValueEventRegistration.java:75)
        at com.google.firebase.database.core.view.DataEvent.fire(DataEvent.java:63)
        at com.google.firebase.database.core.view.EventRaiser$1.run(EventRaiser.java:55)
        at android.os.Handler.handleCallback(Handler.java:907)
        at android.os.Handler.dispatchMessage(Handler.java:99)
        at android.os.Looper.loop(Looper.java:223)
        at android.app.ActivityThread.main(ActivityThread.java:7478)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:549)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:941)


my notificationFragment is:

package com.example.intskot.fragments

import android.os.Bundle
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import androidx.fragment.app.Fragment
import androidx.recyclerview.widget.LinearLayoutManager
import androidx.recyclerview.widget.RecyclerView
import com.example.intskot.Model.Notification
import com.example.intskot.R
import com.example.intskot.adapter.NotificationAdapter
import com.google.firebase.auth.FirebaseAuth
import com.google.firebase.database.DataSnapshot
import com.google.firebase.database.DatabaseError
import com.google.firebase.database.FirebaseDatabase
import com.google.firebase.database.ValueEventListener
import java.util.*
import kotlin.collections.ArrayList


class NotificationsFragment : Fragment()
{
    private var notificationList: List<Notification>? = null
    private var notificationAdapter: NotificationAdapter? = null

    override fun onCreateView(
        inflater: LayoutInflater, container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View? {
        // Inflate the layout for this fragment
        val view = inflater.inflate(R.layout.fragment_notifications, container, false)

        val recyclerView: RecyclerView
        recyclerView = view.findViewById(R.id.recycler_view_notifications)
        recyclerView?.setHasFixedSize(true)
        recyclerView?.layoutManager = LinearLayoutManager(context)

        notificationList = ArrayList()

        notificationAdapter = NotificationAdapter(this.requireContext(), notificationList as ArrayList<Notification>)
        recyclerView.adapter = notificationAdapter

        readNotifications()

        return view
    }

    private fun readNotifications()
    {
        val notiRef = FirebaseDatabase.getInstance()
            .reference.child("Notifications")
            .child(FirebaseAuth.getInstance().currentUser!!.uid)

        notiRef.addValueEventListener(object : ValueEventListener
        {
            override fun onDataChange(dataSnapshot: DataSnapshot)
            {
                if (dataSnapshot.exists())
                {
                    (notificationList as ArrayList<Notification>).clear()

                    for (snapshot in dataSnapshot.children)
                    {
                        val notification = snapshot.getValue(Notification::class.java)

                        (notificationList as ArrayList<Notification>).add(notification!!)
                    }

                    Collections.reverse(notificationList!!)
                    notificationAdapter!!.notifyDataSetChanged()
                }
            }

            override fun onCancelled(error: DatabaseError) {

            }
        })
    }
}

my notification.kt model is:

package com.example.intskot.model

class Notification
{
    private var userid: String = ""
    private var text: String = ""
    private var postid: String = ""
    private var ispost = false

    constructor()

    constructor(userid: String, text: String, postid: String, ispost: Boolean) {
        this.userid = userid
        this.text = text
        this.postid = postid
        this.ispost = ispost
    }

    fun getUserid(): String {
        return userid
    }

    fun getText(): String {
        return text
    }

    fun getPostid(): String {
        return postid
    }

    fun isIsPost(): Boolean {
        return ispost
    }

    fun setUserId(userid: String)
    {
        this.userid = userid
    }

    fun setTextId(text: String)
    {
        this.text = text
    }

    fun setPostId(postid: String)
    {
        this.postid = postid
    }

    fun setIsPost(ispost: Boolean)
    {
        this.ispost = ispost
    }

}


postadapter is:

package com.example.intskot.adapter

import android.content.Context
import android.content.Intent
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.widget.ImageView
import android.widget.TextView
import androidx.annotation.NonNull
import androidx.recyclerview.widget.RecyclerView
import com.example.intskot.CommentsActivity
import com.example.intskot.MainActivity
import com.example.intskot.R
import com.example.intskot.ShowUsersActivity
import com.example.intskot.model.Post
import com.example.intskot.model.User
import com.google.firebase.auth.FirebaseAuth
import com.google.firebase.auth.FirebaseUser
import com.google.firebase.database.DataSnapshot
import com.google.firebase.database.DatabaseError
import com.google.firebase.database.FirebaseDatabase
import com.google.firebase.database.ValueEventListener
import com.squareup.picasso.Picasso
import de.hdodenhof.circleimageview.CircleImageView

class PostAdapter
    (private  val mContext: Context,
     private val mPost: List<Post>) : RecyclerView.Adapter<PostAdapter.ViewHolder>()

{
    private  var firebaseUser:FirebaseUser? = null
    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolder
    {
        val view = LayoutInflater.from(mContext).inflate(R.layout.posts_layout, parent, false)
        return ViewHolder(view)

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

    override fun onBindViewHolder(holder: ViewHolder, position: Int)
    {
        firebaseUser = FirebaseAuth.getInstance().currentUser

        val post = mPost[position]

        Picasso.get().load(post.getPostimage()).into(holder.postImage)

        if (post.getDescription() == "")
        {
            holder.description.visibility = View.GONE
        }
        else
        {
            holder.description.visibility = View.VISIBLE
            holder.description.text = post.getDescription()

        }


        publisherInfo(holder.profileImage, holder.userName, holder.publisher, post.getPublisher())
        isLikes(post.getPostid(), holder.likeButton)
        numberOfLikes(holder.likes, post.getPostid())
        getTotalComments(holder.comments, post.getPostid())
        checkSavedStatus(post.getPostid(), holder.saveButton)

        holder.likeButton.setOnClickListener{
            if (holder.likeButton.tag == "Like")
            {
                FirebaseDatabase.getInstance().reference
                    .child("Likes")
                    .child(post.getPostid())
                    .child(firebaseUser!!.uid)
                    .setValue(true)

                addNotification(post.getPublisher(), post.getPostid())
            }
            else
            {
                FirebaseDatabase.getInstance().reference
                    .child("Likes")
                    .child(post.getPostid())
                    .child(firebaseUser!!.uid)
                    .removeValue()

                val intent = Intent(mContext, MainActivity::class.java)
                mContext.startActivity(intent)

            }
        }

        holder.likes.setOnClickListener {
            val intent = Intent(mContext, ShowUsersActivity::class.java)
            intent.putExtra("id",post.getPostid())
            intent.putExtra("title", "likes")
            mContext.startActivity(intent)

        }


        holder.commentButton.setOnClickListener {
            val intentComment = Intent(mContext, CommentsActivity::class.java)
            intentComment.putExtra("postId", post.getPostid())
            intentComment.putExtra("publisherId", post.getPublisher())
            mContext.startActivity(intentComment)
        }

        holder.comments.setOnClickListener{
            val intentComment = Intent(mContext, CommentsActivity::class.java)
            intentComment.putExtra("postId", post.getPostid())
            intentComment.putExtra("publisherId", post.getPublisher())
            mContext.startActivity(intentComment)
        }

        holder.saveButton.setOnClickListener {
            if (holder.saveButton.tag == "Save")
                {
                    FirebaseDatabase.getInstance().reference
                        .child("Saves")
                        .child(firebaseUser!!.uid)
                        .child(post.getPostid())
                        .setValue(true)
                }
            else
                {
                    FirebaseDatabase.getInstance().reference
                        .child("Saves")
                        .child(firebaseUser!!.uid)
                        .child(post.getPostid())
                        .removeValue()
                }
        }
    }
    private fun numberOfLikes(likes: TextView, postid: String)
    {

        val likesRef = FirebaseDatabase.getInstance().reference
            .child("Likes").child(postid)

        likesRef.addValueEventListener(object : ValueEventListener
        {
            override fun onDataChange(p0: DataSnapshot) {
                if (p0.exists())
                {
                    likes.text = p0.childrenCount.toString() + " likes"
                }
            }
            override fun onCancelled(p0: DatabaseError) {
            }
        })
    }
    private fun getTotalComments(comments: TextView, postid: String)
    {
        val commentsRef = FirebaseDatabase.getInstance().reference
            .child("Comments").child(postid)

        commentsRef.addValueEventListener(object : ValueEventListener
        {
            override fun onDataChange(p0: DataSnapshot)
            {
                if (p0.exists())
                {
                    comments.text = "view all" + p0.childrenCount.toString() + " comments"
                }
            }
            override fun onCancelled(p0: DatabaseError) {
            }
        })
    }

    private fun isLikes(postid: String, likeButton: ImageView)
    {

        val firebaseUser = FirebaseAuth.getInstance().currentUser

        val likesRef = FirebaseDatabase.getInstance().reference
            .child("Likes").child(postid)

        likesRef.addValueEventListener(object : ValueEventListener
        {
            override fun onDataChange(p0: DataSnapshot)
            {
                if (p0.child(firebaseUser!!.uid).exists())
                {
                    likeButton.setImageResource(R.drawable.heart_clicked)
                    likeButton.tag = "liked"
                }
                else
                {
                    likeButton.setImageResource(R.drawable.heart_not_clicked)
                    likeButton.tag = "Like"
                }
            }

            override fun onCancelled(p0: DatabaseError) {

            }
        })
    }

    inner  class ViewHolder(@NonNull itemView: View) : RecyclerView.ViewHolder(itemView)
    {
        var profileImage: CircleImageView = itemView.findViewById(R.id.user_profile_image_post)
        var postImage: ImageView = itemView.findViewById(R.id.post_image_home)
        var likeButton: ImageView = itemView.findViewById(R.id.post_image_like_btn)
        var commentButton: ImageView = itemView.findViewById(R.id.post_image_comment_btn)
        var saveButton: ImageView = itemView.findViewById(R.id.post_save_comment_btn)
        var userName: TextView = itemView.findViewById(R.id.user_name_post)
        var likes: TextView = itemView.findViewById(R.id.likes)
        var publisher: TextView = itemView.findViewById(R.id.publisher)
        var description: TextView = itemView.findViewById(R.id.description)
        var comments: TextView = itemView.findViewById(R.id.comments)

    }

    private fun publisherInfo(profileImage: CircleImageView, userName: TextView, publisher: TextView, publisherID: String)
    {
        val usersRef = FirebaseDatabase.getInstance().reference.child("Users").child(publisherID)

        usersRef.addValueEventListener(object : ValueEventListener
        {
            override fun onDataChange(p0: DataSnapshot)
            {
                if (p0.exists())
                {
                    val user = p0.getValue<User>(User::class.java)

                    Picasso.get().load(user!!.getImage()).placeholder(R.drawable.profile).into(profileImage)
                    userName.text = user!!.getUsername()
                    publisher.text = user!!.getFullname()
                }
            }

            override fun onCancelled(p0: DatabaseError) {

            }
        })
    }
    private fun checkSavedStatus(postid: String, imageView: ImageView)
    {
        val savesRef = FirebaseDatabase.getInstance().reference
            .child("Saves")
            .child(firebaseUser!!.uid)

        savesRef.addValueEventListener(object : ValueEventListener
        {

            override fun onDataChange(p0: DataSnapshot){

                if (p0.child(postid).exists())
                {
                        imageView.setImageResource(R.drawable.save_large_icon)
                        imageView.tag = "Saved"
                }
                else
                {
                        imageView.setImageResource(R.drawable.save_unfilled_large_icon)
                        imageView.tag = "Save"
                }
            }

            override fun onCancelled(p0: DatabaseError) {

            }
        })
    }

    private fun addNotification(userId: String, postId: String)
    {
        val notiRef = FirebaseDatabase.getInstance()
            .reference.child("Notifications")
            .child(userId)

        val notiMap = HashMap<String, Any>()
        notiMap["userid"] = firebaseUser!!.uid
        notiMap["text"] = "liked your post"
        notiMap["postid"] = postId
        notiMap["ispost"] = true

        notiRef.push().setValue(notiMap)
    }
}


user adapter:

package com.example.intskot.adapter

import android.content.Context
import android.content.Intent
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.widget.Button
import android.widget.TextView
import androidx.annotation.NonNull
import androidx.fragment.app.FragmentActivity
import androidx.recyclerview.widget.RecyclerView
import com.example.intskot.MainActivity
import com.example.intskot.R
import com.example.intskot.fragments.ProfileFragment
import com.example.intskot.model.User
import com.google.firebase.auth.FirebaseAuth
import com.google.firebase.auth.FirebaseUser
import com.google.firebase.database.DataSnapshot
import com.google.firebase.database.DatabaseError
import com.google.firebase.database.FirebaseDatabase
import com.google.firebase.database.ValueEventListener
import com.squareup.picasso.Picasso
import de.hdodenhof.circleimageview.CircleImageView

class UserAdapter (private var mContext: Context,
                   private var mUser: List<User>,
                   private var  isFragment: Boolean = false) : RecyclerView.Adapter<UserAdapter.ViewHolder>()
{

    private var firebaseUser: FirebaseUser? = FirebaseAuth.getInstance().currentUser

    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): UserAdapter.ViewHolder {
        val view = LayoutInflater.from(mContext).inflate(R.layout.user_item_layout, parent, false)

        return UserAdapter.ViewHolder(view)

    }

    override fun onBindViewHolder(holder: UserAdapter.ViewHolder, position: Int) {

        val user = mUser[position]

        holder.userNameTextView.text = user.getUsername()
        holder.userFullNameTextView.text = user.getFullname()
        Picasso.get().load(user.getImage()).placeholder(R.drawable.profile).into(holder.userProfileImage)

        checkFollowingStatus(user.getUID(), holder.followButton)

        holder.itemView.setOnClickListener ( View.OnClickListener {
            if (isFragment)
            {
                val pref = mContext.getSharedPreferences("PREFS", Context.MODE_PRIVATE).edit()
                pref.putString("profileId", user.getUID())
                pref.apply()

                (mContext as FragmentActivity).supportFragmentManager.beginTransaction()
                    .replace(R.id.fragment_container, ProfileFragment()).commit()
            }
            else
            {
                val intent = Intent(mContext, MainActivity::class.java)
                intent.putExtra("publisherId", user.getUID())
                mContext.startActivity(intent)
            }
        } )

        holder.followButton.setOnClickListener {
            if (holder.followButton.text.toString() == "Follow")
            {
                firebaseUser?.uid.let { it1 ->
                    FirebaseDatabase.getInstance().reference
                        .child("Follow").child(it1.toString())
                        .child("Following").child(user.getUID())
                        .setValue(true).addOnCompleteListener { task ->
                            if (task.isSuccessful) {
                                firebaseUser?.uid.let { it1 ->
                                    FirebaseDatabase.getInstance().reference
                                        .child("Follow").child(user.getUID())
                                        .child("Followers").child(it1.toString())
                                        .setValue(true).addOnCompleteListener { task ->
                                            if (task.isSuccessful) {

                                            }
                                        }
                                }
                            }
                        }
                }
                addNotification(user.getUID())
            }
            else
            {
                firebaseUser?.uid.let { it1 ->
                    FirebaseDatabase.getInstance().reference
                        .child("Follow").child(it1.toString())
                        .child("Following").child(user.getUID())
                        .removeValue().addOnCompleteListener { task ->
                            if (task.isSuccessful) {
                                firebaseUser?.uid.let { it1 ->
                                    FirebaseDatabase.getInstance().reference
                                        .child("Follow").child(user.getUID())
                                        .child("Followers").child(it1.toString())
                                        .removeValue().addOnCompleteListener { task ->
                                            if (task.isSuccessful) {

                                            }
                                        }
                                }
                            }
                        }
                }
            }
        }
    }

    override fun getItemCount(): Int {
        return mUser.size


    }

    class  ViewHolder(@NonNull itemView: View) : RecyclerView.ViewHolder(itemView){

        var  userNameTextView: TextView = itemView.findViewById(R.id.user_name_search)
        var  userFullNameTextView: TextView = itemView.findViewById(R.id.user_full_name_search)
        var  userProfileImage: CircleImageView = itemView.findViewById(R.id.user_profile_image_search)
        var  followButton: Button = itemView.findViewById(R.id.follow_btn_search)

    }
    private fun checkFollowingStatus(uid: String, followButton: Button)
    {

        val followingRef = firebaseUser?.uid.let { it1 ->
                    FirebaseDatabase.getInstance().reference
                        .child("Follow").child(it1.toString())
                        .child("Following")
        }

        followingRef.addValueEventListener(object : ValueEventListener{

            override fun onDataChange(datasnapshot: DataSnapshot)
            {

                if (datasnapshot.child(uid).exists())
                {
                    followButton.text = "Following"
                }
                else
                {
                    followButton.text = "Follow"

                }
            }

            override fun onCancelled(error: DatabaseError) {


            }
        })
    }

    private fun addNotification(userId: String)
    {
        val notiRef = FirebaseDatabase.getInstance()
            .reference.child("Notifications")
            .child(userId)

        val notiMap = HashMap<String, Any>()
        notiMap["userid"] = firebaseUser!!.uid
        notiMap["text"] = "started following you"
        notiMap["postid"] = ""
        notiMap["ispost"] = false

        notiRef.push().setValue(notiMap)
    }
}


What I have tried:

any help on that? any suggestions ?
Posted
Updated 20-Oct-20 3:21am
Add a Solution

1 solution

When you get an error message you don't understand, google it: Found setter with invalid case-sensitive name - Google Search[^]
The first link tells you what causes it!

See here: Java Encapsulation and Getters and Setters[^]
And read what it says:
Quote:
The get method returns the variable value, and the set method sets the value.

Syntax for both is that they start with either get or set, followed by the name of the variable, with the first letter in upper case

Then look at your code:
Java
fun setPostId(postid: String)
{
    this.postid = postid
}
Your seter has a name which doesn't match the varaible it sets: setPostId vs postid
Change the name:
Java
fun setPostid(postid: String)
{
    this.postid = postid
}
And it shoudl work.
 
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