0
我試圖用Java從在Android上火力地堡數據庫中讀取數據。我有以下數據庫:從Firebase中檢索數據。 AddValueEventListener對複雜對象
{
"info" : {
"about" : "...........",
"address" : "...........",
"bus" : "",
"contact" : "........",
"email" : ".........",
"mobile_phone" : ".........",
"trolley" : ""
},
"schedule" : {
"47" : {
"hall" : {
"id" : 2,
"name" : "..."
},
"presentation" : {
"about" : "",
"id" : 1,
"title" : "....."
},
"section" : {
"id" : 2,
"name" : ".... "
},
"speakers" : [ 101 ],
"time_end" : 0,
"time_start" : 1416652800,
"url" : "......"
}
}
}
我能讀懂簡單的結構,如:
ref.child("info").addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
Info msg =dataSnapshot.getValue(Info.class);
System.out.println(msg.getEmail());
}
@Override
public void onCancelled(FirebaseError firebaseError) {
}
});
但我不知道如何從結構「時間表」中檢索數據。我試圖重新創建POJO並閱讀結構,但它不起作用。
ref.child("schedule").addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
for (DataSnapshot postSnapshot: dataSnapshot.getChildren()) {
Schedule msg =dataSnapshot.getValue(Schedule.class);
System.out.println(msg.getHall().getId());
}
}
@Override
public void onCancelled(FirebaseError firebaseError) {
}
});
爲什麼不這樣做ref.child( 「安排」)?或者只是抓住整個數據庫(如果它只包含信息和時間表) – Bill