[英]Android Firebase get other user's uid from realtime database
Is there any way to get another user's uid from realtime database? 有什么办法可以从实时数据库中获取另一个用户的uid? I want to get 2 name objects from the database with different uids at the same time.
我想从数据库中同时获取具有不同uid的2个名称对象。
Json file: Json文件:
"Users" : {
"PnZdR1Ily5R5R58FYFVEuWN0Q855" : {
"-Kwwceeevvvvvttvv" : {
"name" : "abc"
},
"-Kccrr325gdfgdfFg" : {
"name" : "abc"
}
},
"MeTsW4SsW6e8hGrsFfVUuNNaQ3cj" : {
"-Kfvr345345354555" : {
"name" : "zxc"
},
"-Kbfhf56464646646" : {
"name" : "zxc"
}
}
}
This is my code: 这是我的代码:
ValueEventListener postListener = new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
User details = dataSnapshot.getValue(User.class);
mName = details.name;
}
@Override
public void onCancelled(DatabaseError databaseError) {
Log.w(TAG, "getUser:onCancelled", databaseError.toException());
}
};
mDatabase.child("Users").child($uid).addValueEventListener(postListener);
This is the part I'm stuck on, how do I get both uids at the same time? 这是我要坚持的部分,如何同时获得两个uid?
If you want to retrieve random key then you should use addChildEventValueListerner
because it gives u child of the Users node one by one. 如果要检索随机密钥,则应使用
addChildEventValueListerner
因为它使“ 用户”节点的子节点一个接一个。
FirebaseDatabase firebaseDatabase = FirebaseDatabase.getInstance();
DatabaseReference mref = firebaseDatabase.getReference();
mref.child("Users").addChildEventListener(new ChildEventListener() {
@Override
public void onChildAdded(DataSnapshot dataSnapshot, String s) {
if (dataSnapshot.hasChildren()) {
User details = dataSnapshot.getValue(User.class);
}
}
@Override
public void onChildChanged(DataSnapshot dataSnapshot, String s) {
}
@Override
public void onChildRemoved(DataSnapshot dataSnapshot) {
}
@Override
public void onChildMoved(DataSnapshot dataSnapshot, String s) {
}
@Override
public void onCancelled(DatabaseError databaseError) {
}
});
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