Android 不在firebase中的好友请求片段上显示好友请求
问题是我想在一个名为FriendsFragment的片段中显示所有friends请求。这个片段调用一个适配器类,其中包含一个名为ViewHolder的内部类。 但是朋友的请求没有显示出来。logcat中的消息总是显示“未连接适配器;跳过布局”。问题是什么 下面是我的片段FriendsFragment的代码:Android 不在firebase中的好友请求片段上显示好友请求,android,firebase,kotlin,firebase-realtime-database,Android,Firebase,Kotlin,Firebase Realtime Database,问题是我想在一个名为FriendsFragment的片段中显示所有friends请求。这个片段调用一个适配器类,其中包含一个名为ViewHolder的内部类。 但是朋友的请求没有显示出来。logcat中的消息总是显示“未连接适配器;跳过布局”。问题是什么 下面是我的片段FriendsFragment的代码: class FriendsFragment : Fragment() { private var recyclerView1: RecyclerView?=null pri
class FriendsFragment : Fragment() {
private var recyclerView1: RecyclerView?=null
private var recyclerView2: RecyclerView?=null
private var mUsers:MutableList<Users>?=null
private var friendAdapter:FriendAdapter?=null
private lateinit var mAuth: FirebaseAuth
private var currentState:String?=""
private var firebaseUserId:String=""
override fun onCreateView(
inflater: LayoutInflater, container: ViewGroup?,
savedInstanceState: Bundle?
): View? {
// Inflate the layout for this fragment
val view= inflater.inflate(R.layout.fragment_friends, container, false)
recyclerView1=view.findViewById(R.id.recycler_requests)
recyclerView1?.setHasFixedSize(true)
recyclerView1?.layoutManager=LinearLayoutManager(context)
recyclerView2=view.findViewById(R.id.recycler_Friends)
recyclerView2?.setHasFixedSize(true)
recyclerView2?.layoutManager=LinearLayoutManager(context)
mUsers=ArrayList()
mAuth=FirebaseAuth.getInstance()
firebaseUserId=mAuth.currentUser!!.uid
val usersRef=FirebaseDatabase.getInstance("https://online-chat-541f3-default-rtdb.firebaseio.com").reference.child("Users")
val requestRef =
FirebaseDatabase.getInstance("https://online-chat-541f3-default-rtdb.firebaseio.com").reference.child(
"Friends Requests"
)
usersRef.addValueEventListener(object:ValueEventListener{
override fun onDataChange(p0: DataSnapshot) {
mUsers?.clear()
for (snapshot in p0.children) {
val users: Users? = snapshot.getValue(Users::class.java)
if (!(users!!.getUid()).equals(firebaseUserId) && users != null) {
if(p0.child(firebaseUserId).child(users.getUid().toString()).child("request_type").value=="received" &&
p0.child(users.getUid().toString()).child(firebaseUserId).child("request_type").value=="sent"
) {
mUsers?.add(users)
friendAdapter =
context?.let {
FriendAdapter(
it,
mUsers as ArrayList<Users>,
false
)
}
friendAdapter?.notifyDataSetChanged()
recyclerView1!!.adapter = friendAdapter
}
}
}
}
override fun onCancelled(p0: DatabaseError) {
}
})
return view
}
}
class-FriendsFragment:Fragment(){
私有变量RecycleServiceW1:RecycleServiceView?=null
私有变量recyclerView2:recyclerView2?=null
私有变量mUsers:MutableList?=null
私有变量friendAdapter:friendAdapter?=null
私有lateinit var mAuth:FirebaseAuth
私有变量currentState:字符串?=“”
私有变量firebaseUserId:String=“”
覆盖创建视图(
充气器:布局充气器,容器:视图组?,
savedInstanceState:捆绑?
):查看{
//为该碎片膨胀布局
val视图=充气机。充气(R.layout.fragment\u friends,container,false)
recyclerView1=view.findViewById(R.id.recycler\u请求)
recyclerView1?.setHasFixedSize(真)
recyclerView1?.layoutManager=LinearLayoutManager(上下文)
recyclerView2=view.findViewById(R.id.recycler\u Friends)
RecycleServiceW2?.setHasFixedSize(真)
recyclerView2?.layoutManager=LinearLayoutManager(上下文)
mUsers=ArrayList()
mAuth=FirebaseAuth.getInstance()
firebaseUserId=mAuth.currentUser!!.uid
val usersRef=FirebaseDatabase.getInstance(“https://online-chat-541f3-default-rtdb.firebaseio.com“”。参考。子(“用户”)
val请求参考=
FirebaseDatabase.getInstance(“https://online-chat-541f3-default-rtdb.firebaseio.com).reference.child(
“好友请求”
)
usersRef.addValueEventListener(对象:ValueEventListener{
覆盖数据更改(p0:DataSnapshot){
缪斯?.clear()
用于(p0.children中的快照){
val用户:用户?=snapshot.getValue(用户::class.java)
如果(!(users!!.getUid()).equals(firebaseUserId)&&users!=null){
if(p0.child(firebaseUserId).child(users.getUid().toString()).child(“请求类型”).value==“已接收”&&
p0.child(users.getUid().toString()).child(firebaseUserId).child(“请求类型”).value==“已发送”
) {
缪斯?添加(用户)
友谊适配器=
上下文?让我们来看看{
友谊适配器(
信息技术
作为艺术家的缪斯家,
假的
)
}
friendAdapter?.notifyDataSetChanged()
recyclerView1!!.adapter=friendAdapter
}
}
}
}
已取消覆盖乐趣(p0:DatabaseError){
}
})
返回视图
}
}
显示好友请求的回收器视图为RecycleServiceW1。
此外,还提供了附加到视图保持架的布局的xml代码:
<?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="match_parent"
android:orientation="vertical"
>
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
>
<de.hdodenhof.circleimageview.CircleImageView
android:id="@+id/friendsProfileResource"
android:layout_width="60dp"
android:layout_height="60dp"
android:src="@drawable/username"
>
</de.hdodenhof.circleimageview.CircleImageView>
<TextView
android:id="@+id/usernameFriendsResource"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_toRightOf="@+id/friendsProfileResource"
android:layout_marginTop="10dp"
android:layout_marginStart="30dp"
android:text="Username"
android:textSize="18sp"
android:textStyle="bold"
android:textColor="@color/colorPrimaryDark"
>
</TextView>
<ImageView
android:id="@+id/online_status_img"
android:layout_width="15dp"
android:layout_height="15dp"
android:src="@drawable/online"
android:layout_below="@id/usernameFriendsResource"
android:layout_marginLeft="40dp"
android:layout_marginTop="10dp"
android:visibility="invisible"
>
</ImageView>
<TextView
android:id="@+id/last_message_friends_ressource"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@id/usernameFriendsResource"
android:layout_toRightOf="@id/friendsProfileResource"
android:layout_marginTop="5dp"
android:layout_marginStart="30dp"
android:text="last message"
android:textSize="18sp"
android:maxLines="1"
android:textColor="@color/colorPrimary"
>
</TextView>
<Button
android:id="@+id/accept_friend_button"
android:layout_width="90dp"
android:layout_height="wrap_content"
android:layout_toRightOf="@id/usernameFriendsResource"
android:layout_marginStart="40dp"
android:text="Accept"
android:textSize="18sp"
android:textStyle="bold"
android:textColor="@color/colorPrimaryDark"
android:background="@drawable/buttons2"
android:textAllCaps="false"
>
</Button>
<Button
android:id="@+id/cancel_friend_button"
android:layout_width="90dp"
android:layout_height="wrap_content"
android:layout_toRightOf="@+id/accept_friend_button"
android:layout_marginStart="10dp"
android:text="Cancel"
android:textSize="18sp"
android:textStyle="bold"
android:textColor="@color/colorPrimaryDark"
android:background="@drawable/buttons2"
android:textAllCaps="false"
android:layout_marginEnd="10dp"
>
</Button>
</RelativeLayout>
</LinearLayout>
这也是friendsAdapter类的代码:
package com.example.online_chat.Adapters
import android.content.Context
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.widget.Button
import android.widget.TextView
import androidx.recyclerview.widget.RecyclerView
import com.example.online_chat.Models.Users
import com.example.online_chat.R
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 com.squareup.picasso.Picasso
import de.hdodenhof.circleimageview.CircleImageView
class FriendAdapter(private var mContext: Context,private var mUsers: List<Users>,private var isChatChecked:Boolean):RecyclerView.Adapter<FriendAdapter.ViewHolder?>() {
private var currentState:String?=""
private lateinit var mAuth:FirebaseAuth
private var firebaseUserId:String=""
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolder {
val view=LayoutInflater.from(mContext).inflate(R.layout.user_friends,parent,false)
return ViewHolder(view)
}
override fun onBindViewHolder(holder: ViewHolder, position: Int) {
val users=mUsers[position]
holder.usernameFriend!!.text=users.getUsername()
holder.fullNameFriend!!.text=users.getFullName()
Picasso.get().load(users.getProfile()).into(holder.profileImageFriend)
mAuth= FirebaseAuth.getInstance()
firebaseUserId=mAuth.currentUser!!.uid
}
override fun getItemCount(): Int {
return mUsers.size
}
class ViewHolder(itemView: View):RecyclerView.ViewHolder(itemView){
var usernameFriend:TextView?=itemView.findViewById(R.id.usernameFriendsResource)
var fullNameFriend:TextView?=itemView.findViewById(R.id.last_message_friends_ressource)
var profileImageFriend:CircleImageView?=itemView.findViewById(R.id.friendsProfileResource)
var acceptBtn: Button?=itemView.findViewById(R.id.accept_friend_button)
var cancelBtn:Button?=itemView.findViewById(R.id.cancel_friend_button)
}
}
package com.example.online\u chat.Adapters
导入android.content.Context
导入android.view.LayoutInflater
导入android.view.view
导入android.view.ViewGroup
导入android.widget.Button
导入android.widget.TextView
导入androidx.recyclerview.widget.recyclerview
导入com.example.online_chat.Models.Users
导入com.example.online\u chat.R
导入com.google.firebase.auth.FirebaseAuth
导入com.google.firebase.database.DataSnapshot
导入com.google.firebase.database.DatabaseError
导入com.google.firebase.database.FirebaseDatabase
导入com.google.firebase.database.ValueEventListener
导入com.squareup.picasso.picasso
导入de.hdodenhof.circleimageview.circleimageview
类FriendAdapter(private var mContext:Context,private var mUsers:List,private var isChatChecked:Boolean):RecyclerView.Adapter(){
私有变量currentState:字符串?=“”
私有lateinit var mAuth:FirebaseAuth
私有变量firebaseUserId:String=“”
override onCreateViewHolder(父级:ViewGroup,viewType:Int):ViewHolder{
val view=LayoutInflater.from(mContext).充气(R.layout.user\u friends,parent,false)
返回视图保持器(视图)
}
覆盖BindViewHolder(holder:ViewHolder,位置:Int){
val用户=缪斯[位置]
holder.usernameFriend!!.text=users.getUsername()
holder.fullNameFriend!!.text=users.getFullName()
Picasso.get().load(users.getProfile()).into(holder.profileImageFriend)
mAuth=FirebaseAuth.getInstance()
firebaseUserId=mAuth.currentUser!!.uid
}
重写getItemCount():Int{
返回mUsers.size
}
类ViewHolder(itemView:View):RecyclerView.ViewHolder(itemView){
var usernameFriend:TextView?=itemView.findViewById(R.id.usernameFriendsResource)
var fullNameFriend:TextView?=itemView.findViewById(R.id.last\u message\u friends\u ressource)
var profileImageFriend:CircleImageView?=itemView.findViewById(R.id.friendsProfileResource)
var acceptBtn:Button?=itemviewbyd(R.id.accept\u friend\u Button)
var cancelBtn:Button?=itemviewbyd(R.id.cancel\u friend\u Button)
}
}
谢谢大家! 您确定此条件有效吗 if(p0.child(firebaseUserId).child(users.getUid().toString()).child(
FriendAdapter(it,mUsers as ArrayList<Users>,false)
usersRef.addValueEventListener( DataSnapshot ->
mUsers?.clear()
for (snapshot in p0.children) {
val user: Users? = snapshot.getValue(Users::class.java)
// check that reference
val requestRef = FirebaseDatabase.getInstance("https://online-chat-541f3-default-rtdb.firebaseio.com").reference.child("Friends Requests/" + user.getId())
// this is pseudo code
requestRef.addValueEventListener( friendsdataSnapshot ->
for (friend if friendsDataSnapshot) {
//addFriend to mUsersList
}
friendAdapter = context?.let {
FriendAdapter(it, mUsers as ArrayList<Users>, false)
}
friendAdapter?.notifyDataSetChanged()
recyclerView1!!.adapter = friendAdapter
)