Here is my Firebase data:
enter image description here
I want to query same store , and count total quantity to Android ,
I have set a hashmap and listdata and listview
final Firebase myFirebaseRef = new Firebase("******");
myFirebaseRef.addValueEventListener(new ValueEventListener() {
#Override
public void onDataChange(DataSnapshot snapshot)
{
lvAll.setAdapter(null);
int size = (int) snapshot.getChildrenCount();
HashMap<String, Object> myHasMap = new HashMap<String, Object>();
listData.clear();
myHasMap.clear();
myHasMap.put("Name",coffeename[0]);
myHasMap.put("Count","Total is "+size);
listData.add(myHasMap);
listItemAdapter.notifyDataSetChanged();
lvAll.setAdapter(listItemAdapter);
}
#Override
public void onCancelled(FirebaseError firebaseError) {
}
});
This is JSON :
{
"5533" : {
"coffeeNo" : "美式咖啡",
"date" : 20170602,
"store" : "中正店",
"style" : "小熱"
},
"1231236" : {
"coffeeNo" : "美式咖啡",
"date" : 20170604,
"store" : "桃銘店",
"style" : "中冰"
},
"123q" : {
"coffeeNo" : "美式咖啡",
"date" : 20170603,
"store" : "中山店",
"style" : "中熱"
},
"qwe223" : {
"coffeeNo" : "美式咖啡",
"date" : 20170607,
"store" : "中山店",
"style" : "中熱"
}
}
For example : I want to query the same key , and I can get the number in store "中山店" is 2 , and in store "中正店" is 1 , and in store "桃銘店" is 1 ?
You'll need to loop over the items in the snapshot and aggregate based on the coffeeNo:
for (DataSnapshot child: snapshot.getChildren()) {
String coffeeNo = child.child("coffeeNo").getValue(String.class);
int count = 1;
if (myHashMap.containsKey(coffeeNo)) {
count = (int) myHashMap.get(coffeeNo) + 1;
}
myHashMap.put(coffeeNo, count);
}
Related
i have a problem in sorting the dates in ascending order to display in recyclerview
Here below is my database structure in firebase-realtime-database
{
firstitem : {
"name" : "first_item_name",
"date" : "29/11/2018",
"user" : "random user",
"url" : "My Url",
"tag" : "firstitem"
},
seconditem : {
"name" : "second_item_name",
"date" : "20/11/2018"
"user" : "another user",
"url" : "a url",
"tag" : "seconditem"
},
thirditem : {
"name" : "third_item_name",
"date" : "20/11/2017"
"user" : "another user",
"url" : "a url",
"tag" : "thirditem"
}
etc....
}
By using the above structure i wants to display in ascending order according to dates, What query i should do to do this, Please a give me a solution to recover from this problem ,Thanks in advance.
Query MyEventsRef = FirebaseDatabase.getInstance().getReference().child("Workers Details").child(userID)
.child("My Events").orderByChild("From_Date");
//Display events
FirebaseRecyclerOptions<WorkerMyEvents> options =
new FirebaseRecyclerOptions.Builder<WorkerMyEvents>()
.setQuery(MyEventsRef, WorkerMyEvents.class)
.build();
FirebaseRecyclerAdapter<WorkerMyEvents, WorkerMyEventViewHolder> firebaseRecyclerAdapter
= new FirebaseRecyclerAdapter<WorkerMyEvents, WorkerMyEventViewHolder>(options) {
#Override
protected void onBindViewHolder(#NonNull final WorkerMyEventViewHolder eventsViewHolder, int i, #NonNull final WorkerMyEvents newEvents)
{
//Id with date and time key
final String IDs = getRef(i).getKey();
final String eventIDs = IDs.substring(0,18);
final String serve = list3.get(i);
NewEventsRef.child(eventIDs).addListenerForSingleValueEvent(new ValueEventListener() {
#Override
public void onDataChange(#NonNull DataSnapshot dataSnapshot)
{
if (dataSnapshot.exists())
{
With the following code, I have the "history node".
History Node
{
"History" : {
"-LJANnl9ofbXlxLGxTGg" : {
"destination" : "3 Paradise Row",
"driver" : "ReGqRl2IIUhmLIqdBqBIELHBsgE3",
"location" : "1 Union St",
"payment response" : "approved",
"rating" : 0,
"ridePrice" : 5.25,
"rider" : "l3PPyBQux7YJhGGTdexxwDBteLM2",
"riderPaid" : "true",
"status" : "accepted",
"timestamp" : 1533494377
}
}
With the following code, I am trying to update "status" value to update from "accepted" to "arrived_loc". When I run the code, I have a yellow highlight in firebase but keeps the value of status "accepted".
update status to "arrived_loc"
driverId = FirebaseAuth.getInstance().getCurrentUser().getUid();
final DatabaseReference rootRef = FirebaseDatabase.getInstance().getReference();
Query query = rootRefchild("History").orderByChild("driver").equalTo(driverId);
query.addListenerForSingleValueEvent(new ValueEventListener() {
#Override
public void onDataChange(DataSnapshot dataSnapshot) {
DataSnapshot nodeDS = dataSnapshot.getChildren().iterator().next();
String key = nodeDS.getKey();
Log.e(TAG, "key = " + key);
String path = "/" + dataSnapshot.getKey() + "/" + key;
Log.e(TAG, "path = " + path);
HashMap<String, Object> update = new HashMap<>();
update.put("status", "arrived_loc");
rootRef.child(path).updateChildren(update);
}
#Override
public void onCancelled(DatabaseError databaseError) {
}
});
What am I doing wrong?
Edit #1
If I run this code:
DatabaseReference arrivedLoc = FirebaseDatabase.getInstance().getReference("History");
String historyId = arrivedLoc.push().getKey();
arrivedLoc.child(historyId).child("status").setValue("arrived at pickup");
I get an extra history node and no update:
"History" : {
"-LJAVN2iAWfRREdlBevb" : {
"destination" : "3 Union St",
"driver" : "ReGqRl2IIUhmLIqdBqBIELHBsgE3",
"location" : "123 Main Street",
"payment response" : "approved",
"rating" : 0,
"ridePrice" : 5.38,
"rider" : "l3PPyBQux7YJhGGTdexxwDBteLM2",
"riderPaid" : "true",
"status" : "accepted",
"timestamp" : 1533496391
},
"-LJAVaFd3Gzq3iIZGHeP" : {
"payment response" : "approved",
"riderPaid" : "true",
"status" : "accepted"
}
}
Edit #2 - image of database frozen
Edit #3
I can't seem to get it working for some reason so I renamed "status" to be "requestStatus" and created a new variable called rideStatus like:
status = "arrived at pickup";
DatabaseReference rootRef = FirebaseDatabase.getInstance().getReference().child("History");
rootRef.child(requestId).child("rideStatus").setValue(status);
This seems to work for now, but when I need to change the value of rideStatus, hopefully it will work.
Try with this code without push() function:
DatabaseReference arrivedLoc = FirebaseDatabase.getInstance().getReference("History");
String historyId = arrivedLoc.getKey();
arrivedLoc.child(historyId).child("status").setValue("arrived at pickup");
(depends on what you need to achieve on your app, might be a little different)
Update #2:
DatabaseReference rootRef = FirebaseDatabase.getInstance().getReference().child("History");
addValueEventListener(new ValueEventListener() {
#Override
public void onDataChange(DataSnapshot dataSnapshot) {
if(dataSnapshot.exists()){
for(DataSnapshot snapshot : dataSnapshot.getChildren()){
snapshot.getRef().child("status").setValue("arrived at pickup");
}
}
}
#Override
public void onCancelled(DatabaseError databaseError) {
}
});
}
Try with updateChildren():
driverId = FirebaseAuth.getInstance().getCurrentUser().getUid();
HashMap<String, String> newData = new HashMap<>();
newData.put("status", "arrived_loc");
final DatabaseReference rootRef = FirebaseDatabase.getInstance().getReference().child("History/" + driverId); // Or however the path is
rootRef.updateChildren(newData);
Child1
Child1.1
Subchild1
Subchild 2
Child 1.2
Subchild 1
Subchild 2
If I need to retrieve child1.1 and 1.2 how do I get them in textview?, as their subchild can be retrieved easily using datasnapshot.
I dont have enogh reputation to post image so have to type the structure of my firebase project. Hope my problem is understandable.
Code What i done is...
LoggedInRef.child(number).addValueEventListener(new ValueEventListener() {
#Override
public void onDataChange(DataSnapshot dataSnapshot) {
if(dataSnapshot != null) {
if (sampleList != null) {
for (DataSnapshot ds : dataSnapshot.getChildren()) {
/* msg_List_Item msgLIST=ds.getValue(msg_List_Item.class);
msgList.add(msgLIST);*/
Log.d("MESSAGES<<<<<<<<", ds.getValue().toString() + "<<<<<<<<<<<<<<<<<<<<<<<<<<");
String msg = ds.getValue(String.class); // problem is here............................................
String time = ds.child("DateTime").getValue(String.class);
String tag = ds.child("Tag").getValue(String.class);
msg_List_Item msg_list_item = new msg_List_Item(msg, time, tag);
/* msg_list_item.setMsg(msg);
msg_list_item.setDateTime(time);
msg_list_item.setTag(tag);*/
msgList.add(msg_list_item);
MessageAdapter = new msgAdapter(msgList, getApplicationContext());
mRecyclerView.setAdapter(MessageAdapter);
sampleList.clear();
mRecyclerView.scrollToPosition(MessageAdapter.getItemCount());
}
}
}
else {
Toast.makeText(Message.this, "No data found", Toast.LENGTH_SHORT).show();
}}
#Override
public void onCancelled(DatabaseError databaseError) {
}}
);
"1234567890" : {
"-L7AhB1GWZPNqlte0tiX" : {
"DateTime" : "09-03-2018 22:30",
"MSG" : "hiii ",
"Tag" : "ByMe"
},
"-L7AiOxVbSYAx8_0WqEa" : {
"DateTime" : "09-03-2018 22:35",
"MSG" : "how are you",
"Tag" : "ByMe"
},
"-L7Ak1lhqn9EfD5YCOou" : {
"DateTime" : "09-03-2018 22:42",
"MSG" : "what are u doing?",
"Tag" : "ByMe"
},
"-L7AkGekOzKzlLOwWNWp" : {
"DateTime" : "09-03-2018 22:43",
"MSG" : "I am fine",
"Tag" : "NotByMe"
here is my Re modified structure!!!. *Child node : * "DateTime", "MSG", "Tag" become easier to fetch by using push().
I'm working using Firebase this my database is looking like
my database screenshot
{
"CookerInfo" : {
"org1mLyyJNXtiGo8NimxhWvpId42" : {
"about" : "Cooker since 2005",
"address" : "agamy - italy ",
"available" : "tuesday from 5 am to 9 pm",
"cookerDishes" : {
"-Kk3RgXiUEgpgjF1aAdc" : {
"foodName" : "mol5ia",
"foodUrl" : "https://firebasestorage.googleapis.com/v0/b/fir-auth- aa979.appspot.com/o/dishphoto%2F1494723249227.jpg?alt=media&token=0fc03b18-d310- 493a-b332-c1f3e4896567",
"price" : "8 $",
"timeToPrepared" : "10 min",
"weight" : "100 gm "
}
},
"name" : "chef.mohamed",
"phone" : "0192822228",
"url" : "https://firebasestorage.googleapis.com/v0/b/fir-auth-aa979.appspot.com/o/cookerPhoto%2F1494723157098.jpg?alt=media&token=19e4e376-0013-4410-bc04-0483aff09902"
},
"vuUscH2L7wgtj2N3rGWOOjgv23s2" : {
"about" : "cookgood",
"address" : "alexandria",
"available" : "sunday",
"cookerDishes" : {
"-Kk32fy0FO1vtZgm6AOK" : {
"foodName" : "chiken",
"foodUrl" : "https://firebasestorage.googleapis.com/v0/b/fir-auth- aa979.appspot.com/o/dishphoto%2F1494716692079.jpg?alt=media&token=a70ed96e-acbc-45c6-95b7-4811fd8e2e26",
"price" : "10$",
"timeToPrepared" : "10 min",
"weight" : "100gm"
},
"-Kk32mfQWiMRLFV2SMo7" : {
"foodName" : "rise",
"foodUrl" : "https://firebasestorage.googleapis.com/v0/b/fir-auth- aa979.appspot.com/o/dishphoto%2F1494716718899.jpg?alt=media&token=6b9007f5-c22e-4ed4-83aa-a80f45e5363f",
"price" : "8 $",
"timeToPrepared" : "8 min",
"weight" : "50 gm"
}
},
"name" : "sherbini",
"phone" : "01093812681",
"url" : "https://firebasestorage.googleapis.com/v0/b/fir-auth-aa979.appspot.com/o/cookerPhoto%2F1494716634787.jpg?alt=media&token=2ba72b6d-0af0-4235-bff5-4b706e91486f"
}
}
}
And I want to reach to cookerDishes for specific cooker only (1 cooker) to put his dishes in gridview, however I don't save the ID in model.
I tried something like that, but it didn't work.
Query queryRef=mDatabaseRef.orderByChild("name")
.equalTo(COOKERNAME);
DatabaseReference node =queryRef.getRef();
node.child("cookerDishes").addValueEventListener(new ValueEventListener() {
#Override
public void onDataChange(DataSnapshot dataSnapshot) {
Iterable<DataSnapshot> children=dataSnapshot.getChildren();
for (DataSnapshot child : children){
FoodDish fooddish = new FoodDish();
String food_name =child.child("foodName").getValue(String.class);
fooddish.setFoodName(food_name);
foodList.add(fooddish);
}
gv.setAdapter(adapter);
}
#Override
public void onCancelled(DatabaseError databaseError) {
}
});
I think you forgot to call notifyDataSetChanged() on your addapter
You don't need to call getRef() on the query. Instead you should attach the listener directly to the query:
Query queryRef=mDatabaseRef
.orderByChild("name")
.equalTo(COOKERNAME);
queryRef.addValueEventListener(new ValueEventListener() {
#Override
public void onDataChange(DataSnapshot dataSnapshot) {
for (DataSnapshot cookerSnapshot : dataSnapshot.getChildren()){
DataSnapshot cookerDishes = cookerSnapshot.getChild("cookerDishes"));
for (DataSnapshot dishSnapshot: cookerDishes.getChildren()) {
FoodDish fooddish = new FoodDish();
String food_name =child.child("foodName").getValue(String.class);
fooddish.setFoodName(food_name);
foodList.add(fooddish);
}
I am new to Android Studio and Firebase itself. I understand that in order to get the child's data from its unique ID, I might need to use a Data Snapshot method. For example, I need to retrieve the name from Firebase database back to android studio application. How do I implement it in this case? Help would be much appreciated!
{
"0Zs7aiWplRRJ5IJ5pazuUOxIdqz2" : {
"name" : "yeo",
"pos" : "intern",
"team" : "nwrs"
},
"kaLCjJFoGETWCWH42kNkc90b5Ku1" : {
"2016" : {
"9" : {
"25" : {
".priority" : 0.0,
"AM" : "",
"OT" : "",
"OVN" : "",
"PM" : "",
"TPT" : ""
}
},
"10" : {
"1" : {
".priority" : 0.0,
"AM" : "zxc11",
"OT" : "12",
"OVN" : "33",
"PM" : "222",
"TPT" : "54"
},
"26" : {
"AM" : "aa",
"OVN" : "gg",
"PM" : "ccc",
"TPT" : ""
},
"29" : {
".priority" : 0.0,
"AM" : "dd",
"OVN" : "aa",
"PM" : "ss",
"TPT" : "2fd"
}
}
},
"name" : "Jing Yang",
"pos" : "Intern",
"team" : "NWRS"
}
}
Below is my current code
root.addValueEventListener(new ValueEventListener() {
#Override
public void onDataChange(DataSnapshot dataSnapshot) {
Set<String> set = new HashSet<String>();
Iterator i = dataSnapshot.getChildren().iterator();
while (i.hasNext()){
set.add(((DataSnapshot)i.next()).getKey());
}
names.clear();
names.addAll(set);
arrayAdapter.notifyDataSetChanged();
I'll assume that root refers to the root of your database. In that case your onDataChange will get a snapshot of the entire data at that location. You can loop over them and get the properties of each child in turn with:
root.addValueEventListener(new ValueEventListener() {
#Override
public void onDataChange(DataSnapshot dataSnapshot) {
Set<String> set = new HashSet<String>();
for (DataSnapshot childSnapshot: dataSnapshot.getChildren()) {
//set.add(childSnapshot.getKey());
set.add(childSnapshot.child("name").getValue(String.class));
}
names.clear();
names.addAll(set);
arrayAdapter.notifyDataSetChanged();
But I highly recommend that you create a Java class that represents the items in your list. In your case that can be as simple as:
public class Item {
public string name;
public string pos;
public string team;
}
Then you can read the items with:
root.addValueEventListener(new ValueEventListener() {
#Override
public void onDataChange(DataSnapshot dataSnapshot) {
Set<String> set = new HashSet<String>();
for (DataSnapshot childSnapshot: dataSnapshot.getChildren()) {
Item child = childSnapshot.getValue(Item.class);
set.add(item.name);
}
names.clear();
names.addAll(set);
arrayAdapter.notifyDataSetChanged();