我正在Kotlin上为Android开发聊天应用程序。我正在为我的客户这样做，以便他们可以与我交谈。我正在尝试实现2种提取用户方法，其中一种将用于提取我的帐户，另一种用于提取其他帐户。第二种方法可以正常工作，但是该应用程序无法获取我的帐户。我正在为数据库使用Firebase API。
注意：这些方法在“新消息”活动中使用。
KOTLIN
package com.eneluis.chat.messages
import android.content.Intent
import android.os.Bundle
import androidx.appcompat.app.AppCompatActivity
import android.util.Log
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.eneluis.chat.R
import com.eneluis.chat.models.User
import com.squareup.picasso.Picasso
import com.xwray.groupie.GroupAdapter
import com.xwray.groupie.Item
import com.xwray.groupie.ViewHolder
import kotlinx.android.synthetic.main.activity_new_message.*
import kotlinx.android.synthetic.main.user_row_new_message.view.*
class NewMessageActivity : AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_new_message)
supportActionBar?.title = "Alege utilizatorul"
fetchEne()
fetchUsers()
}
companion object {
val USER_KEY = "USER_KEY"
}
private fun fetchEne() {
val Ene = FirebaseDatabase.getInstance().getReference("/users")
Ene.addListenerForSingleValueEvent(object : ValueEventListener {
override fun onDataChange(p0: DataSnapshot) {
val adapter = GroupAdapter<ViewHolder>()
p0.children.forEach {
Log.d("NewMessage", it.toString())
val user = it.getValue(User::class.java)
if (user != null) {
adapter.add(EneItem(user))
}
}
adapter.setOnItemClickListener { item, view ->
val EneItem = item as EneItem
val intent = Intent(view.context, ChatLogActivity::class.java)
// intent.putExtra(USER_KEY, userItem.user.username)
intent.putExtra(USER_KEY, EneItem.user)
startActivity(intent)
finish()
}
recyclerview_newmessage.adapter = adapter
}
override fun onCancelled(p0: DatabaseError) {
}
})
}
private fun fetchUsers() {
val ref = FirebaseDatabase.getInstance().getReference("/useri")
ref.addListenerForSingleValueEvent(object : ValueEventListener {
override fun onDataChange(p0: DataSnapshot) {
val adapter = GroupAdapter<ViewHolder>()
p0.children.forEach {
Log.d("NewMessage", it.toString())
val user = it.getValue(User::class.java)
if (user != null) {
adapter.add(UserItem(user))
}
}
adapter.setOnItemClickListener { item, view ->
val userItem = item as UserItem
val intent = Intent(view.context, ChatLogActivity::class.java)
// intent.putExtra(USER_KEY, userItem.user.username)
intent.putExtra(USER_KEY, userItem.user)
startActivity(intent)
finish()
}
recyclerview_newmessage.adapter = adapter
}
override fun onCancelled(p0: DatabaseError) {
}
})
}
class EneItem(val user: User) : Item<ViewHolder>() {
override fun bind(viewHolder: ViewHolder, position: Int) {
viewHolder.itemView.username_textview_new_message.text = user.username
Picasso.get().load(user.profileImageUrl).into(viewHolder.itemView.imageview_new_message)
}
override fun getLayout(): Int {
return R.layout.user_row_new_message
}
}
class UserItem(val user: User) : Item<ViewHolder>() {
override fun bind(viewHolder: ViewHolder, position: Int) {
viewHolder.itemView.username_textview_new_message.text = user.username
Picasso.get().load(user.profileImageUrl).into(viewHolder.itemView.imageview_new_message)
}
override fun getLayout(): Int {
return R.layout.user_row_new_message
}
}
}
XML
<?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"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.eneluis.chat.messages.NewMessageActivity">
<androidx.recyclerview.widget.RecyclerView
android:background="@android:color/holo_blue_light"
android:id="@+id/recyclerview_newmessage"
app:layoutManager="androidx.recyclerview.widget.LinearLayoutManager"
android:layout_width="0dp"
android:layout_height="0dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>
Firebase
chat-e4f05
useri
UENUzTa7QwNAPGYxZCx4xMZz4BG2
profileImageUrl:
"https://firebasestorage.googleapis.com/v0/b/cha..."
uid:
"UENUzTa7QwNAPGYxZCx4xMZz4BG2"
username:
"hdhdhd"
Xi50i1c3D8VFZF4Nqqc9tls2wy92
profileImageUrl:
"https://firebasestorage.googleapis.com/v0/b/cha..."
uid:
"Xi50i1c3D8VFZF4Nqqc9tls2wy92"
username:
"asd"
hVhX4VsGDpMu3v9NbgDRbRXYX703
profileImageUrl:
"https://firebasestorage.googleapis.com/v0/b/cha..."
uid:
"hVhX4VsGDpMu3v9NbgDRbRXYX703"
username:
"fh"
rBuaTbfPk5TzFBYaTrA82At2vWM2
profileImageUrl:
"https://firebasestorage.googleapis.com/v0/b/cha..."
uid:
"rBuaTbfPk5TzFBYaTrA82At2vWM2"
username:
"gdhdh"
vZZg7JeWweRV6Q8xKKalIB2quaB2
profileImageUrl:
"https://firebasestorage.googleapis.com/v0/b/cha..."
uid:
"vZZg7JeWweRV6Q8xKKalIB2quaB2"
username:
"vfhf"
xPaRKjWsRRcwzpAXNIuBm4n9j1w2
profileImageUrl:
"https://firebasestorage.googleapis.com/v0/b/cha..."
uid:
"xPaRKjWsRRcwzpAXNIuBm4n9j1w2"
username:
"br"
users
Q99f8rN2uRSflXMIi7diST75ba43
profileImageUrl:
"https://firebasestorage.googleapis.com/v0/b/cha..."
uid:
"Q99f8rN2uRSflXMIi7diST75ba43"
username:
"Ene Andrei"