1
我有我的firebaseRecyclerAdapter及其populateViewHolder如下访问子节点
Query queryRef = chatRef.orderByKey();
queryRef.addChildEventListener(new ChildEventListener() {
@Override
public void onChildAdded(DataSnapshot snapshot, String previousChild) {
System.out.println(snapshot.getKey());
for (DataSnapshot snapshot1 : snapshot.getChildren()) {
final String firstname = snapshot.getKey();
chatViewHolder.setName(firstname);
chatViewHolder.mView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
//Log.w(TAG, "You clicked on "+position);
//String firstname = tList.getFirstname();
//String lastname = tList.getLastname();
//firstname = firstname.substring(0, 1).toUpperCase() + firstname.substring(1); //convert first string to uppercase
//lastname = lastname.substring(0, 1).toUpperCase() + lastname.substring(1);// same thing happening here
//String name = (firstname + " " + lastname); // concatenate firstname and lastname variable.
Intent intent = new Intent(getActivity(), MainChat.class); //change to onclick
intent.putExtra("fullname", firstname);
//you can name the keys whatever you like
//intent.putExtra("image", userList.getImgUrl().toString()); //note that all these values have to be primitive (i.e boolean, int, double, String, etc.)
startActivity(intent);
}
});
}
这是备份用回收适配器和我的数据库看起来像
users
uid
conversations
sLname + sFname
-KyF........:
message: hi
timestamp: ServerValue.timestamp
-KyFr......:
message:hello
timestamp: ServerValue.timestamp
实施的firebaseRecyclerAdapter
RecyclerView recycler = (RecyclerView) rootView.findViewById(R.id.recyclerview4);
recycler.setHasFixedSize(true);
recycler.setLayoutManager(new LinearLayoutManager(getActivity()));
FirebaseRecyclerAdapter mAdapter = new FirebaseRecyclerAdapter<ChatList, ChatHolder>(ChatList.class, R.layout.chatlistrow, ChatHolder.class, chatRef) {
@Override
public void populateViewHolder(final ChatHolder chatViewHolder, final ChatList chatList, final int position) {
//try catch block to catch events of no posts, it will most likely return a null error, so I'm catching it, else
//find its exception and catch itef
contactList = new ArrayList<String>();
//start here and getkey for everyone
contactList.add(chatRef.getKey());
//String firstname = chatRef.getKey();
//chatViewHolder.setName(firstname);
Query queryRef = chatRef.orderByKey();
queryRef.addChildEventListener(new ChildEventListener() {
@Override
public void onChildAdded(DataSnapshot snapshot, String previousChild) {
System.out.println(snapshot.getKey());
for (DataSnapshot snapshot1 : snapshot.getChildren()) {
final String firstname = snapshot.getKey();
chatViewHolder.setName(firstname);
chatViewHolder.mView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
//Log.w(TAG, "You clicked on "+position);
Intent intent = new Intent(getActivity(), MainChat.class); //change to onclick
intent.putExtra("fullname", firstname);
//you can name the keys whatever you like
//intent.putExtra("image", userList.getImgUrl().toString()); //note that all these values have to be primitive (i.e boolean, int, double, String, etc.)
startActivity(intent);
}
});
}
//testing
}
@Override
public void onChildChanged(DataSnapshot snapshot, String previousChild) {
}
@Override
public void onChildMoved(DataSnapshot snapshot, String previousChild) {
}
@Override
public void onChildRemoved(DataSnapshot snapshot) {
}
@Override
public void onCancelled(DatabaseError databaseError) {
}
// ....
});
}
};
recycler.setAdapter(mAdapter);
我的前任port.json是
"admin" : {
"ZpMBDchTkPVh7El3EsIKEdmV28n1" : {
"bio" : "",
"conversations" : {
"Chinwendu Chiebidolu" : {
"-KYCaWdm7IJrF-yau0ES" : {
"message" : "hello",
"rfirstname" : "Chinwendu",
"rimgUrl" : "",
"rlastname" : "Chiebidolu",
"rname" : "Chinwendu Chiebidolu",
"timestamp" : 1480918181229,
"userId" : "lgsmNM2LXuVq8NBoDwDCaoe5B613"
}
},
"Damilola Aromiwe" : {
"-KYBzfTc5xHCPGM06QIE" : {
"message" : "hi",
"rfirstname" : "Damilola",
"rimgUrl" : "2124",
"rlastname" : "Aromiwe",
"rname" : "Damilola Aromiwe",
"timestamp" : 1480907995851,
"userId" : "ujNyb5erkSN7oS3aGZlXyc9Q0YJ2"
},
"-KYCYYkifzI-61dBKsTT" : {
"message" : "hello",
"rfirstname" : "Damilola",
"rimgUrl" : "2124",
"rlastname" : "Aromiwe",
"rname" : "Damilola Aromiwe",
"timestamp" : 1480917404523,
"userId" : "ujNyb5erkSN7oS3aGZlXyc9Q0YJ2"
},
"-KYCZ19NM2yKinU5eSLt" : {
"message" : "hello mr dammy, are you there? ",
"rfirstname" : "Damilola",
"rimgUrl" : "2124",
"rlastname" : "Aromiwe",
"rname" : "Damilola Aromiwe",
"timestamp" : 1480917527734,
"userId" : "ujNyb5erkSN7oS3aGZlXyc9Q0YJ2"
}
}
},
"email" : "[email protected]",
"firstname" : "Toyosi",
"imgUrl" : "2124",
"lastname" : "Yusuf",
"name" : "toyosi",
"parent" : true,
"phone" : "",
"teacher" : false,
"userId" : "ZpMBDchTkPVh7El3EsIKEdmV28n1"
}
},
"teachers" : {
"inFa52OMArdKyUTMYrkRqWs50uD2" : {
"bio" : "",
"email" : "[email protected]",
"firstname" : "David",
"imgUrl" : "",
"lastname" : "Akinyemi",
"name" : "",
"parent" : false,
"phone" : "",
"teacher" : true,
"userId" : "inFa52OMArdKyUTMYrkRqWs50uD2"
},
"xITyS4TrbWXPBhHYAgz0ZsdyYFa2" : {
"bio" : "",
"email" : "[email protected]",
"firstname" : "Ejura",
"imgUrl" : "",
"lastname" : "Ayeni",
"name" : "",
"parent" : false,
"phone" : "",
"teacher" : true,
"userId" : "xITyS4TrbWXPBhHYAgz0ZsdyYFa2"
}
},
"users" : {
"HJ55v7xUGmXQN2o1AQFDG9JtzCy1" : {
"bio" : "",
"email" : "[email protected]",
"firstname" : "",
"imgUrl" : "",
"lastname" : "",
"name" : "",
"parent" : true,
"phone" : "",
"teacher" : false,
"userId" : "HJ55v7xUGmXQN2o1AQFDG9JtzCy1"
},
"KrVp7D6gLoZoH6WcHT5tmyqb3o53" : {
"bio" : "",
"email" : "[email protected]",
"firstname" : "",
"imgUrl" : "",
"lastname" : "",
"name" : "",
"parent" : true,
"phone" : "",
"teacher" : false,
"userId" : "KrVp7D6gLoZoH6WcHT5tmyqb3o53"
},
"lgsmNM2LXuVq8NBoDwDCaoe5B613" : {
"bio" : "",
"conversations" : {
"Toyosi Yusuf" : {
"-KYCaWdHGbWxsk8h7EWy" : {
"message" : "hello",
"sfirstname" : "Toyosi",
"simageurl" : "2124",
"slastname" : "Yusuf",
"timestamp" : 1480918179544
}
}
},
"email" : "[email protected]",
"firstname" : "Chinwendu",
"imgUrl" : "",
"lastname" : "Chiebidolu",
"name" : "",
"parent" : true,
"phone" : "",
"teacher" : false,
"userId" : "lgsmNM2LXuVq8NBoDwDCaoe5B613"
},
"ujNyb5erkSN7oS3aGZlXyc9Q0YJ2" : {
"bio" : "",
"conversations" : {
"Toyosi Yusuf" : {
"-KYBzfT_p8N2oW7oqSke" : {
"message" : "hi",
"sfirstname" : "Toyosi",
"simageurl" : "2124",
"slastname" : "Yusuf",
"timestamp" : 1480907995531
},
"-KYCYYkfORU70Y1_PGug" : {
"message" : "hello",
"sfirstname" : "Toyosi",
"simageurl" : "2124",
"slastname" : "Yusuf",
"timestamp" : 1480917401926
},
"-KYCZ19KyX8X5G25CEz5" : {
"message" : "hello mr dammy, are you there? ",
"sfirstname" : "Toyosi",
"simageurl" : "2124",
"slastname" : "Yusuf",
"timestamp" : 1480917527335
}
}
},
"email" : "[email protected]",
"firstname" : "Damilola",
"imgUrl" : "2124",
"lastname" : "Aromiwe",
"name" : "",
"parent" : true,
"phone" : "",
"teacher" : false,
"userId" : "ujNyb5erkSN7oS3aGZlXyc9Q0YJ2"
}
}
}
chatList.class（）点这里
package com.mordred.theschoolapp;
/**
* Created by mordred on 11/29/16.
*/
public class ChatList {
public String userId;
public String rname;
public String rlastname;
public String rimageurl;
public ChatList() {
// Default constructor required for calls to DataSnapshot.getValue(User.class)
}
public String getFirstname() {
return rname;
}
public void setFirstname(String firstname) {
this.rname = firstname;
}
public String getLastname() {
return rlastname;
}
public void setLastname(String lastname) {
this.rlastname = lastname;
}
public String getImgUrl() {
return rimageurl;
}
public void setImgUrl(String imgUrl) {
this.rimageurl = imgUrl;
}
public String getUserId() {
return userId;
}
public void setUserId(String userId) {
this.userId = userId;
}
}
这里的问题是，我尝试在回收适配器递归检索这些信息。 但是，前面的代码在上面，我只是不断重复第一条消息。 谁能告诉我发生了什么事，我该如何解决？如果您需要任何其他信息，请询问。谢谢
我不明白你的问题。你可以发布“FirebaseRecyclerAdapter”的实现，指出适配器监听数据库的哪个节点，以及“chatRef”指向的位置。另外，你在数据库的'sLname + sFname'中意味着什么？最好是发布确切的JSON格式，只需**从Firebase数据库控制台导出JSON **。 – Wilik
谢谢，我刚刚更新了我的问题，在这个节点'用户/ /会话/ /' –
Mordred
所以'chatRef'点？ – Wilik