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> I have a Client app and Driver app under 1 Firebase Project.
This link is only said yes it can be done, but how can it be done?? not stated
Two different google-services.json
One Firebase Database for both
When from Customer app order is made, it is saving to Database as a child("Orders"), and as a test, I can retrieve those Orders in Customer app.
But how to retrieve those Orders in Driver app??
This is a piece of code, in Driver app which tries to retrieve data from Customer app.
final DatabaseReference rootRef = FirebaseDatabase.getInstance().getReference("Orders");
final ValueEventListener eventListener = new ValueEventListener() {
#Override
public void onDataChange(DataSnapshot dataSnapshot) {
for (DataSnapshot ds : dataSnapshot.getChildren()) {
String name = ds.child("name").getValue(String.class);
String surname = ds.child("surname").getValue(String.class);
String beverages = ds.child("beverages").getValue(String.class);
String deserts = ds.child("deserts").getValue(String.class);
String time = ds.child("time").getValue(String.class);
edtx_name.setText(name);
edtx_surname.setText(surname);
edtx_beverages.setText(beverages);
edtx_deserts.setText(deserts);
edtx_time.setText(time);
Log.d("Test", "" + edtx_name + "/" + edtx_surname + "/" + edtx_beverages + "/" + edtx_deserts + "/" + edtx_time);
}
}
#Override
public void onCancelled(DatabaseError databaseError) {}
};
rootRef.addListenerForSingleValueEvent(eventListener);
But this doesnt retrieve. what am i making wrong?
Related
teamapp-25ba7
schedules
-LHc3zKZhNFLq536dpA1
UID:
date:
details:
time:
title:
-LHc7MBAoNwLWCNgkZ_y
UID:
date:
details:
time:
title:
from the above example of my nodes, i would like to just get details and time values ,my question is how do i retrieve just those 2 values . i tried iterating through all the values but that just gets me everything
Assuming that you want to get the values of details and time properties from all objects and also assuming that the details property is of type String and the time is ServerValue.TIMESTAMP, to solve this please use the following code:
DatabaseReference rootRef = FirebaseDatabase.getInstance().getReference();
DatabaseReference schedulesRef = rootRef.child("schedules");
ValueEventListener valueEventListener = new ValueEventListener() {
#Override
public void onDataChange(DataSnapshot dataSnapshot) {
for(DataSnapshot ds : dataSnapshot.getChildren()) {
String details = ds.child("details").getValue(String.class);
long time = ds.child("time").getValue(Long.class);
Log.d("TAG", details + " / " + time);
}
}
#Override
public void onCancelled(#NonNull DatabaseError databaseError) {}
};
schedulesRef.addListenerForSingleValueEvent(valueEventListener);
I am trying to query a child node value but I don't know parent key, I want to query for Firebase Adapter. I want to access userid node under area but I don't know the Id of parent i.e -KqPJMsjSb5CbPcq4nXv
Here is the snapshot of Record:
Please use this code:
DatabaseReference rootRef = FirebaseDatabase.getInstance().getReference();
DatabaseReference userIdRef = rootRef.child("areas").child(userId);
ValueEventListener eventListener = new ValueEventListener() {
#Override
public void onDataChange(DataSnapshot dataSnapshot) {
for(DataSnapshot ds : dataSnapshot.getChildren()) {
String areaId = ds.child("areaId").getValue(String.class);
Boolean booked = ds.child("booked").getValue(Boolean.class);
Integer bookingHour = ds.child("bookingHour").getValue(Integer.class);
//and so on
Log.d("TAG", areaId + " / " + booked + " / " + bookingHour);
}
}
#Override
public void onCancelled(DatabaseError databaseError) {}
};
userIdRef.addListenerForSingleValueEvent(eventListener);
In which userId is the id of the user that said that is not missing.
When you execute a query against the Firebase Database, there will potentially be multiple results.
So the snapshot contains a list of those results. Even if there is only a single result, the snapshot will contain a list of one result.
I have stored user posts details in Post node under USERID in firebase database accordingly in incremental order as Post1, Post2 so on. Now I want to retrieve all the data within Post node one by one in descending order as Post2, Post1 and show in custom listview. For retrieving single post node data it is working fine but not working for retrieving multiple/all post nodes.
Here is my firebase database image:
For showing all the posts i have tried this way:
dataref1.addValueEventListener(new
com.google.firebase.database.ValueEventListener() {
#Override
public void onDataChange(com.google.firebase.database.DataSnapshot
dataSnapshot) {
list.clear();
for(com.google.firebase.database.DataSnapshot dataSnap :
dataSnapshot.getChildren())
{
for(com.google.firebase.database.DataSnapshot datas :
dataSnap.getChildren()) {
DataModel datamodel =
dataSnap.getValue(DataModel.class);
list.add(datamodel);
}
}
CustomAdapter adapter = new CustomAdapter(Home.this,list);
listView.setAdapter(adapter);
}
#Override
public void onCancelled(DatabaseError databaseError) {
}
});
It is just showing the user name in custom listview.
I have checked many tutorials but haven't find the solution. Kindly help me out.
Thank you :)
To display those posts you need to change a little bit your Firebase database. For the moment all your posts are nested under the uid. You need to add another node, named posts, a direct child of the uid, in which you need to add all those post separately. Your database should look like this:
Firebase-root
|
---- city: "City Name"
|
---- email: "name#email.com"
|
---- //and so on
|
---- posts
|
---- post1
|
---- post2
|
---- post3
|
//and so on
To diplsy those posts, please use this code:
//get the uid
FirebaseUser firebaseUser = firebaseAuth.getCurrentUser();
if (firebaseUser != null) {
String uid = firebaseUser.getUid();
}
DatabaseReference rootRef = FirebaseDatabase.getInstance().getReference();
DatabaseReference postsRef = rootRef.child(uid).child("posts");
ValueEventListener eventListener = new ValueEventListener() {
#Override
public void onDataChange(DataSnapshot dataSnapshot) {
for(DataSnapshot ds : dataSnapshot.getChildren()) {
String description = ds.child("description").getValue(String.class);
String dateTime = ds.child("dateTime").getValue(String.class);
String posturi = ds.child("posturi").getValue(String.class);
String severity = ds.child("severity").getValue(String.class);
Log.d("TAG", description + " / " + dateTime + " / " + posturi + " / " + severity);
}
}
#Override
public void onCancelled(DatabaseError databaseError) {}
};
yourRef.addListenerForSingleValueEvent(eventListener);
FirebaseUI library make it very easy. Allow you to use FirebaseRecyclerAdapter to populate a RecyclerView
Here the official guide
FirebaseUI
I am reading the data from the firebase database.Following is snapshot of the data stored in database.
In the snap string starting with "8SS..." is the uid of the user. Following is the code for retrieving the data from firebase database.
//To check if uid of current user and database user matches.
Query q = FirebaseDatabase.getInstance().getReference().child("Location").child(user.getUid()).equalTo(FirebaseAuth.getInstance().getCurrentUser().getUid());
q.addListenerForSingleValueEvent(
new ValueEventListener() {
#Override
public void onDataChange(DataSnapshot dataSnapshot) {
for(DataSnapshot singleSnapshot : dataSnapshot.getChildren()){
Log.d(TAG, "Yay!!");
User us = singleSnapshot.getValue(User.class);
String string = "Name: "+ us.getName()+"\nAddress: "+ us.getlat()+ us.getlon()+ "\n\n";
n.setText(string);
}
}
#Override
public void onCancelled(DatabaseError databaseError) {
// read query is cancelled.
Log.d(TAG, "loadPost:onCancelled", databaseError.toException());
}
});
User class contains getters and setters.
The error is that only empty Text View appears concluding reading from database fails.
How to evaluate if query is true or false?
What is the error while reading from ValueEventListener()?
I tried using this:
DatabaseReference ref = FirebaseDatabase.getInstance().getReference().child("Location").child("8SS0uk4FmiPUtXP208Tx8Cqxt2z2");
And then calling on ref.addListenerForSingleValueEvent() but still nothing gets displayed.
I tried using this:
DatabaseReference ref = FirebaseDatabase.getInstance().getReference().child("Location").child(user.getUid());
This gives dataSnapShot : "DataSnapshot={key='-Kn...', value="latitude:.., longitude:..., Name:..."}. But this is not how I expected it to be.
The database structure should have been Location --> Uid --> Name : "Jane", .. .
This is my code for inserting data in the database.
FirebaseUser user = FirebaseAuth.getInstance().getCurrentUser() ;
refDatabase = FirebaseDatabase.getInstance().getReference().child("Location").child(user.getUid());
DatabaseReference newPost = refDatabase.push();
//the push() command is already creating unique key
Map<String, String> mapname = new HashMap<String, String>();
mapname.put("Name", n.getText().toString());
mapname.put("latitude", Double.toString(lat));
mapname.put("longitude", Double.toString(longt));
mapname.put("user id", user.getUid());
newPost.setValue(mapname);
I solved this question by introducing multiple for loops.
So, the snapshot of my first child was dataSnapShot : "DataSnapshot={key='-Kn...', value="latitude:.., longitude:..., Name:..."}.
Below is the code to extract all the values and keys :
mRef.addValueEventListener(
new ValueEventListener() {
#Override
public void onDataChange(DataSnapshot dataSnapshot) {
Log.d(TAG, "Children" + dataSnapshot.getKey());
for(DataSnapshot singleSnapshot : dataSnapshot.getChildren()){
String st = singleSnapshot.getKey();
Log.d(TAG, "Yay!!" + singleSnapshot.child(st));
st = "";
int count=0;
for(DataSnapshot singleSnap : singleSnapshot.getChildren()) {
Log.d(TAG, "String" + singleSnap.getValue());
//n.setText(us.getName());
if(count==0) {
st = "Name: " + singleSnap.getValue() + '\n';
}
else if(count==1) {
st = st + "Latitude: " + singleSnap.getValue() + '\n';
}
else if(count==2) {
st = st + "Longitude: " + singleSnap.getValue() + '\n';
}
count++;
}
final TextView rowTextView = new TextView(Menu5.this.getActivity());
rowTextView.setText((CharSequence) st);
ll.addView(rowTextView);
}
}
This gives single key and value pair for every unique id of created by push.So, I had to hard code the concatenation and display as the structure will remain same throughout the app.
Why are you using equal to and then getting the current user. .child(user.getUid()) should already be your current user which gives you the value of the child you are trying to listen to.
I think the uuid's are the children of "8SSOuk.......".
So it should look something like this:
FirebaseDatabase.getInstance().getReference().child("Location").child("8SSOuk.......").child(user.getUid());
I am using Firebase for both authentication and realtime database. My authentication code was successfully run also my enter value to database code also run, but when I am coding for fetch value in database, I am getting run time error trying to enter value at Firebase database:
FATAL EXCEPTION: main
Process:com.xxx.xxx, PID: 22601
com.google.firebase.database.DatabaseException: Invalid Firebase Database
path: https://xxx-exxe.firebaseio.com/. Firebase Database paths must not contain '.', '#', '$', '[', or ']'
My Code is :
final FirebaseDatabase database = FirebaseDatabase.getInstance();
DatabaseReference reference = database.getReference("https://korsa-e03ae.firebaseio.com/");
reference.addValueEventListener(new com.google.firebase.database.ValueEventListener() {
#Override
public void onDataChange(com.google.firebase.database.DataSnapshot dataSnapshot) {
Offerride user = dataSnapshot.getValue(Offerride.class);
if (user == null){
Toast.makeText(getContext(),"User data is null!",Toast.LENGTH_LONG).show();
return;
}
tvsource.setText(user.source + " , " + user.destination + " , " + user.startDate + " , " + user.startTime);
}
#Override
public void onCancelled(DatabaseError databaseError) {
Toast.makeText(getContext(), "Failefddd", Toast.LENGTH_LONG).show();
}
});
I think the answer is quite obvious you don't need to specific the url because app is already link to the database when you set up the project
just change from
DatabaseReference reference = database.getReference("https://korsae03ae.firebaseio.com/");
to
DatabaseReference reference = database.getReference();
Then it should work
Url of your database is in your google-services.json file.
By firebase docs https://firebase.google.com/docs/database/admin/retrieve-data to read data, you can do the following:
final FirebaseDatabase database = FirebaseDatabase.getInstance();
DatabaseReference ref = database.getReference("posts");
// Attach a listener to read the data at our posts reference
ref.addValueEventListener(new ValueEventListener() {
#Override
public void onDataChange(DataSnapshot dataSnapshot) {
Post post = dataSnapshot.getValue(Post.class);
System.out.println(post);
}
#Override
public void onCancelled(DatabaseError databaseError) {
System.out.println("The read failed: " + databaseError.getCode());
}
});
Instead of using getReferance use, getReferanceFromUrl.
and in your case: database.getReference.child("posts");