Keynode | Interactive Keyboard Controller for Swift | Keyboard library
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Interactive Keyboard Controller for Swift
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QUESTION
My Firebase RealtimeDatabase Contains a Table called Records. In that table there are FirebaseUser Uid's, in each Uid there are dates and in each date there is a list of products. This is an example from the firebase console.
In an activity called DailyTableActivity there is a button prompting to DatePickerDialog and a ListView element which should show the products of a specific date from the dialog (or the current date) for the connected User.
This is class Product
...ANSWER
Answered 2021-May-25 at 11:48String public void getRecordOfDate( String date , final DataStatus dataStatus){
final String currId= FirebaseAuth.getInstance().getCurrentUser().getUid();
date="D_"+date;
DatabaseReference recordsOfUser=FirebaseDatabase.getInstance().getReference().child("records").child(currId);
DatabaseReference dateRef=recordsOfUser.child(date);
dateRef.addListenerForSingleValueEvent(new ValueEventListener() {
@Override
public void onDataChange(@NonNull @NotNull DataSnapshot snapshot) {
if (snapshot.exists()){
List keys = new ArrayList<>();
if(snapshot.hasChild(date)){
for (DataSnapshot keyNode : snapshot.getChildren()) {
//products.clear();
keys.add(keyNode.getKey());
//Product product = keyNode.getValue(Product.class);
String Name = keyNode.child("name").getValue().toString();
double Cal = Double.parseDouble(keyNode.child("cal").getValue().toString());
double Carb = Double.parseDouble(keyNode.child("carb").getValue().toString());
double Prot = Double.parseDouble(keyNode.child("prot").getValue().toString());
double Fat = Double.parseDouble(keyNode.child("fat").getValue().toString());
String Unit = keyNode.child("unit").getValue().toString();
int Def = Integer.parseInt(keyNode.child("def").getValue().toString());
String Id = keyNode.getKey();
Product product = new Product(Name, Cal, Carb, Prot, Fat, Unit, Def, Id);
Log.d("DATA_SUCCESS", "Adding product " + product.getName());
products.add(product);
dataStatus.DataIsLoaded(products, keys);
}
}else{System.out.print("Date does not exist")}
}
}
@Override
public void onCancelled(@NonNull @NotNull DatabaseError error) {
}
});}
QUESTION
I'm trying to retrieve data from Firebase Realtime database into a table called "joueur" but i have the following error:
com.google.firebase.database.DatabaseException: E/AndroidRuntime: FATAL EXCEPTION: main Process: com.example.florian.fichiertexteandbddtest1, PID: 899 com.google.firebase.database.DatabaseException: Can't convert object of type java.util.ArrayList to type com.example.florian.fichiertexteandbddtest1.Joueur
My Firebase Realtime Database is this one:firebase realtime database
I'm trying to get the value of joueurs inside the children of tables Joueurs
Here is my code to retrieve the data and add it to the table:
...ANSWER
Answered 2021-Apr-12 at 10:56To be able to get the data according to your database schema, you need to loop through the "DataSnapshot" object using ".getChildren()" twice, as explained in the following lines of code:
QUESTION
I need to insert lesson object to firebase, so I put here the onData change section of code. First of all I get data snapshot and insert the lessons that I have in firebase, after that I scan the List of Lessons and check: if the date and time exist in the firebase in any Lesson so I do something else I insert the lesson object to firebase . The main problem is : when I insert the details of the lesson and press add, the lesson enter to the firebase twice minimum, and if I try another insertion the program enter to infinite loop . will be happy for any help !
...ANSWER
Answered 2020-Jul-09 at 08:09When you call you're adding a listener to the data at
. This listener will immediately read the data and call your onDataChange
, and then continues to listen for updates to the data.
For each update to the data, it calls your onDataChange
again. And since you're updating the data inside onDataChange
, this ends in an endless loop of setValue
->onDataChange
->setValue
->onDataChange
->...
To fix this, you'd typically use addListenerForSingleValueEvent
instead, as this only gets the value once and doesn't continue listening for changes.
So something like:
QUESTION
I need to add 3 more nodes to a xml document. I'm trying to solve the issu of many ways, but unfortunately with no results My code is doing the job, but is adding an attribute that i don´t want: How can do this repeating the node?
...ANSWER
Answered 2020-Jul-08 at 12:38First remark is that $XmlDocument = Get-ChildItem
can returm a number of both DirectoryInfo
and FileInfo
objects. You should not treat that as the full path string of a single item in the folder.
The Path for the xml ends in .imdi
. Is that the folder name or did you rename the xml file to have the .imdi
extension?
Next, you are using a function Get-XmlNodes
I don't have. Is that from some module?
Here is the revised code without using that function, assuming C:\Scripts\Add_Languages\Source\IVB1-20180808_01.imdi
is not the full path to a single xml file with a strange extension, but the path to a folder where your xml is stored.
QUESTION
I'm creating an app in Android Studio, which connects to Firebase realtime database. In the database I have the following structure:
First thing: I would have preferred a structure like:
users -> email -> {23, 13, 4, .., 5} but i found out that with Firebase I must have a pair key - value so I can't get this kind of structure. Am I right?!
Anyways.. I created a class like this:
...ANSWER
Answered 2020-Jun-21 at 22:53This will show nothing because you're trying to get value from users not test@email,com
Try this
Instead of this
QUESTION
I'm following a youtube tutorial to read realtime database from firebase. The child value is send with intent from login page to main page. There's no error in code instead I got the error like below when attempting to open the main page.
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.project/com.example.project.MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'com.google.firebase.database.ValueEventListener com.google.firebase.database.DatabaseReference.addValueEventListener(com.google.firebase.database.ValueEventListener)' on a null object reference
for the code is below
...ANSWER
Answered 2020-Jun-17 at 13:45One of "FirebaseDatabase.getInstance().getReference().child(....)" is returning NULL. It seems the one in "readsensor()" method. Please check if the "value" is filled with the right String before use it!
QUESTION
def.h
...ANSWER
Answered 2020-May-19 at 23:17Yacc/bison assign their own numbers to terminal tokens, and assume that the lexer will use those numbers. But you provide your own numbers in the def.h
header, which yacc/bison knows absolutely nothing about. It will not correctly interpret the codes returned by yylex
which will make it impossible to parse correctly.
So don't do that.
Let bison generate the token codes, use the header file it generates (parser.h
with your settings), and don't step on its feet by trying to define the enum values yourself.
As a hint about debugging, that is really way too much code to have written before you start debugging, and that fact is exactly illustrated by your complaint at the end of your question that you don't know where to look for the error. Instead of writing the whole project and then hoping it works as a whole, write little pieces and debug them as you go. Although you need to parser to generate the token type values, you don't need to run the parser to test your scanner. You can write a simple program which repeatedly calls yylex
and prints the returned types and values. (Or you can just enable flex debugging with the -d
command line option, which is even simpler.)
Similarly, you should be able to test your AST methods by writing some test functions which use these methods to build, walk and print out an AST. Make sure that they produce the expected results.
Only once you have evidence that the lexer is producing the correct tokens and that your AST construction functions work should you start to debug your parser. Again, you will find it much easier if you use the built-in debugging facilities; see the Debugging your parser section of the Bison manual for instructions.
Good luck.
QUESTION
I want to make a notifications fragment in Android application, for that i have a firebase database like the following
...ANSWER
Answered 2020-Apr-23 at 22:18You are receiving data some time later. Inflating layout is faster than fetching data from Firebase.
So yes, at the end of the onCreateView()
method list is empty beacuse you will receive them later (in the listener).
When you need to display data in some list, you have to do in onDataChange()
method:
QUESTION
I am trying to write a recursive function that, given the root of a binary tree and a key, searches for the key using in-order traversal. The function returns NULL if the node with the key isn't found; otherwise it returns the node containing the key.
What I'm having trouble with is returning the node that contains the key. Every time I call the function and the key is in the binary tree, the function returns NULL. It feels like the result keeps getting overwritten by the initialization in the first line in the function.
Here's the in-order search function:
...ANSWER
Answered 2020-Feb-15 at 14:51This code:
QUESTION
Hi i've got some xml files, I'm trying to use xpath by getting the "mapfile" attribute value from the xml (shown below), then getting all the "key" values from the external mapfile, which I can do no problem.
Then I need to get all the "key" numbers from the xml file below that correspond to this mapfile. The problem is I can get them all out, but I need to get them out and check against each file individually, not the whole lot.
the xml is split up into "listsections" each "listsection" has a map file. I want to check the "key" values in the "listsection" against the "key" values in the map file.
so what i've tried is
...ANSWER
Answered 2020-Jan-28 at 10:50I figured it out, I needed to
- Select each section node in Thislist xml file
- Get the mapfile values foreach section in the Thislist xml file.
- Read all the key values in the mapfiles for that section into a list
- Get all the key values from Thislist xml file for that section into a list
- Compare the two lists and see if there are any that are missing
If there are some that are missing flag it up
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