{
"57c80ec0-e73f-49df-8296-25999e194288" : {
"email" : "ss@zz.mm",
"hotel" : {
"-KEaYE1YfvPTRfgcO6Z_" : {
"latit" : 20.15135303358223,
"longit" : 23.86566750705242,
"name" : "new marker"
},
"-KEaYGDhbFAN99GyY0cH" : {
"latit" : 30.211601559876424,
"longit" : -4.754576571285725,
"name" : "new marker"
},
"-KEbjCjmx4-Xmr_1aVCy" : {
"latit" : 20.58906906737089,
"longit" : 25.271570831537247,
"name" : "new marker"
}
},
"password" : "nn",
"username" : "ss"
},
"c01528ea-a22c-43de-b77a-bc833c5e394c" : {
"email" : "ses@ses.ses",
"hotel" : {
"-KEaLImMODDRiDwK3gSo" : {
"latit" : 18.160196227874213,
"longit" : 26.094263345003128,
"name" : "new marker"
},
"-KEaLKSEg1psa4xvggse" : {
"latit" : 31.71881281252363,
"longit" : -2.9933271557092667,
"name" : "new marker"
}
},
"password" : "ses",
"username" : "ses"
}
}
所以,我的想法是在数据库中显示每个用户的所有酒店的标记,这里我遇到查询问题。我不确定如何查询每个用户。
这是我尝试的但是当我调试时,我为hotel.getName获取null,为lat和long获取0 ..
如果有人能告诉我我做错了什么或如何解决它,我真的很感激..
这是我的第一个问题,所以如果我做错了,我会道歉。 :)
干杯!
private Firebase firebase = new Firebase("https://josip-my-application.firebaseio.com/Users/");
@Override
public void requestMarkers() {
Firebase hotelsRef = new Firebase("https://josip-my-application.firebaseio.com/Users/");
com.firebase.client.Query queryRef = hotelsRef.orderByChild("hotel");
queryRef.addChildEventListener(new ChildEventListener() {
@Override
public void onChildAdded(DataSnapshot dataSnapshot, String s) {
Hotel hotel = dataSnapshot.getValue(Hotel.class);
presenter.onMarkersLoaded(hotel.getName(), hotel.getLatit(), hotel.getLongit());
}
@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(FirebaseError firebaseError) {
}
});
答案 0 :(得分:2)
在您正在侦听的/Users
节点下,您有用户节点。 Hotel
个节点更深一层。
显示每位用户的酒店列表:
Firebase hotelsRef = new Firebase("https://josip-my-application.firebaseio.com/Users/");
com.firebase.client.Query queryRef = hotelsRef.orderByChild("hotel");
queryRef.addChildEventListener(new ChildEventListener() {
@Override
public void onChildAdded(DataSnapshot userSnapshot, String s) {
DataSnapshot hotelsSnapshot = userSnapshot.child("hotel");
for (DataSnapshot hotelSnapshot: hotelsSnapshot.getChildren()) {
Hotel hotel = hotelSnapshot.getValue(Hotel.class);
presenter.onMarkersLoaded(hotel.getName(), hotel.getLatit(), hotel.getLongit());
}
// TODO: call adapter.notifyDataSetChanged();
}