im new to Android Studio. So, im trying to use IF-Else statement to retrive data from firebase using radio button. When click on submit button, it should open a new activity and all of the data should display in one page using listview. But, instead of one page, the output display in many activites. Each activity contain one data. I think its because of my if else statement. Can someone help me? Thank you
So this is my code for SelectAge.class
public class SelectAge extends AppCompatActivity {
Button sbmit;
RadioGroup rg1,rg2;
RadioButton rb1,rb2;
DatabaseReference dr;
EditText et;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_select_age);
rg1 = findViewById(R.id.A1);
rg2 = findViewById(R.id.A2);
dr = FirebaseDatabase.getInstance().getReference("Data");
sbmit = findViewById(R.id.SubmitBtn);
ArrayList<String> al = new ArrayList<>();
ArrayAdapter<String> ad;
sbmit.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
int radioID1 = rg1.getCheckedRadioButtonId();
int radioID2 = rg2.getCheckedRadioButtonId();
rb1 = findViewById(radioID1);
rb2 = findViewById(radioID2);
dr.addChildEventListener(new ChildEventListener() {
#Override
public void onChildAdded(#NonNull DataSnapshot snapshot, #Nullable String previousChildName) {
if (rb1.getText().equals(snapshot.child("Age").getValue()) && (!rb2.getText().equals(snapshot.child("Allergy").getValue()
))) {
String ingredient = snapshot.child("Ingredient").getValue().toString();
Intent intent = new Intent(SelectAge.this, result.class);
intent.putExtra("Result", ingredient);
startActivity(intent);
}
}
#Override
public void onChildChanged(#NonNull DataSnapshot snapshot, #Nullable String previousChildName) {
}
#Override
public void onChildRemoved(#NonNull DataSnapshot snapshot) {
}
#Override
public void onChildMoved(#NonNull DataSnapshot snapshot, #Nullable String previousChildName) {
}
#Override
public void onCancelled(#NonNull DatabaseError error) {
}
});
}
});
}
public void checkButton(View v){
int radioID1 = rg1.getCheckedRadioButtonId();
int radioID2 = rg2.getCheckedRadioButtonId();
rb1 = findViewById(radioID1);
rb2 = findViewById(radioID2);
Toast.makeText(SelectAge.this,"Select" +rb1.getText(),Toast.LENGTH_LONG).show();
}
}
My sample data
In your use case do not use dr.addChildEventListener(new ChildEventListener() {...});
While using a ChildEventListener is the recommended way to read lists of data, there are situations where attaching a ValueEventListener to a list reference is useful.
Attaching a ValueEventListener to a list of data will return the entire list of data as a single DataSnapshot, which you can then loop over to access individual children.
Even when there is only a single match for the query, the snapshot is still a list; it just contains a single item. To access the item, you need to loop over the result:
dr.addValueEventListener(new ValueEventListener() {
#Override
public void onDataChange(DataSnapshot dataSnapshot) {
for (DataSnapshot snapshot: dataSnapshot.getChildren()) {
if (rb1.getText().equals(snapshot.child("Age").getValue()) && (!rb2.getText().equals(snapshot.child("Allergy").getValue()
))) {
String ingredient = snapshot.child("Ingredient").getValue().toString();
Intent intent = new Intent(SelectAge.this, result.class);
intent.putExtra("Result", ingredient);
startActivity(intent);
return; // stop looping we have found our item
}
}
}
#Override
public void onCancelled(DatabaseError databaseError) {
// Getting Post failed, log a message
Log.w(TAG, "loadIngredient:onCancelled", databaseError.toException());
// ...
}});
Detailed information in documentation
I hope this helps 😊
Related
So, I have this Firebase Structure.
I made an autocompletetext to get all child named "alimento".
That's OK!
But now, based on this "alimento" selection, I want to get all other childs in TextViews referent to this selection.
Is It possible? I don't know If I was clear enough.
This is my code: (I tried a lot of stuff, but all always return 0.00, so I won't put anything)
public class MainActivity extends AppCompatActivity {
private Button btnList, buttonAdicionar;
private AutoCompleteTextView autoCompleteTextView;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btnList = (Button) findViewById(R.id.btnList);
buttonAdicionar = (Button) findViewById(R.id.buttonAdicionar);
//Nothing special, create database reference.
final DatabaseReference database = FirebaseDatabase.getInstance().getReference();
//Create a new ArrayAdapter with your context and the simple layout for the dropdown menu provided by Android
final HRArrayAdapter<String> adapter = new HRArrayAdapter<>(this, android.R.layout.simple_dropdown_item_1line);
//Child the root before all the push() keys are found and add a ValueEventListener()
database.child("alimentos").addValueEventListener(new ValueEventListener() {
#Override
public void onDataChange(DataSnapshot dataSnapshot) {
adapter.clear();
//Basically, this says "For each DataSnapshot *Data* in dataSnapshot, do what's inside the method.
for (DataSnapshot suggestionSnapshot : dataSnapshot.getChildren()){
//Get the suggestion by childing the key of the string you want to get.
String autocomplete = suggestionSnapshot.child("alimento").getValue(String.class);
adapter.add(autocomplete);
adapter.notifyDataSetChanged();
}
}
#Override
public void onCancelled(DatabaseError databaseError) {
}
});
autoCompleteTextView = (AutoCompleteTextView) findViewById(R.id.acTV);
autoCompleteTextView.setAdapter(adapter);
autoCompleteTextView.setThreshold(1);
autoCompleteTextView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
final String alimento = (String) parent.getItemAtPosition(position);
Log.d("TAG", alimento);
Toast.makeText(getApplicationContext(), alimento, Toast.LENGTH_SHORT).show();
}
});
btnList.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
startActivity(new Intent(getApplicationContext(), FoodActivity.class));
}
});
buttonAdicionar.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
startActivity(new Intent(getApplicationContext(), NewAlimentoActivity.class));
}
});
}
}
This is an example that what I want (using SQL):
If you're asking how to get all child nodes with a specific value in their alimento property, that'd be something like:
database.child("alimentos")
.orderByChild("alimento")
.equalTo("Arroz, integral, cozido")
.addValueEventListener(new ValueEventListener() {
#Override
public void onDataChange(DataSnapshot dataSnapshot) {
for (DataSnapshot snapshot : dataSnapshot.getChildren()){
String base = snapshot.child("base").getValue(String.class);
double baseValue = Double.parseDouble(base);
...
}
}
#Override
public void onCancelled(DatabaseError databaseError) {
throw databaseError.toException(); // never ignore errors
}
});
I am trying to create a random key in a child on button click and insert data in this key
but When I click on the button it creates multiple keys with the same data and it goes continuously till I close the app in the background
above problem is in postreview() method in my code i call this method on the button clcik
public class DisplayStory extends AppCompatActivity {
TextView Tittle;
WebView webView;
String story;
String storyname;
String catagory;
String TAG = "display";
DatabaseReference storyref;
DatabaseReference ratingref;
RatingObject ratingObject;
// review stuff
RatingBar user_ratingBar;
EditText comment_EditText;
EditText senderName_editText;
Button submit;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_display_story);
Tittle = findViewById(R.id.TITLE);
webView = findViewById(R.id.webview);
// review stuff
user_ratingBar = findViewById(R.id.ratings_to_submit);
comment_EditText = findViewById(R.id.comment_to_submit);
senderName_editText = findViewById(R.id.sender_name);
submit = findViewById(R.id.submit_btn);
storyname = getIntent().getStringExtra("tittle");
catagory = getIntent().getStringExtra("catagory");
Log.d(TAG,"storyname "+storyname);
Log.d(TAG,"storyname "+catagory);
Tittle.setText(storyname);
storyref = FirebaseDatabase.getInstance().getReference(catagory).child(storyname);
ratingref = FirebaseDatabase.getInstance().getReference(catagory).child(storyname).child("rating");
submit.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
PostReview();
}
});
storyref.child("story").addValueEventListener(new ValueEventListener() {
#Override
public void onDataChange(#NonNull DataSnapshot dataSnapshot) {
if (dataSnapshot.exists()){
story = dataSnapshot.getValue().toString();
webView.loadData(story,"text/html", "UTF-8");
webView.getSettings().setBuiltInZoomControls(true);
webView.getSettings().setDisplayZoomControls(false);
Log.d(TAG,"story exist ");
Log.d(TAG,"story "+story);
}
else {
Log.d(TAG,"no story exist ");
}
}
#Override
public void onCancelled(#NonNull DatabaseError databaseError) {
}
});
}
public void PostReview(){
final String name,comment;
final float rating;
name = senderName_editText.getText().toString();
comment = comment_EditText.getText().toString();
rating = user_ratingBar.getRating();
ratingref.addValueEventListener(new ValueEventListener() {
#Override
public void onDataChange(#NonNull DataSnapshot dataSnapshot) {
ratingObject =
new RatingObject(name,comment,rating);
ratingref.push().setValue(ratingObject);
}
#Override
public void onCancelled(#NonNull DatabaseError databaseError) {
}
});
}
}
As far as I can see, there is no need to attach a listener in your PostReview method since you don't use any data from the dataSnapshot in there.
So in that case, the code can be much simpler:
public void PostReview(){
final String name,comment;
final float rating;
name = senderName_editText.getText().toString();
comment = comment_EditText.getText().toString();
rating = user_ratingBar.getRating();
ratingObject = new RatingObject(name,comment,rating);
ratingref.push().setValue(ratingObject);
}
This will also solve the endless loop, which was caused by calling setValue inside the onDataChange of a listener added with addValueEventListener. For a longer explanation of that, see:
Changing value in Firebase results in infinite loop
Insert data to firebase -Android - and check specific properties
I want to replace kids/[id]/kidLimit/[new data]
So what I do is I make a spinner with kidName data, then with the selected item from that spinner I want to replace the data of kidLimit (with the same parent as the selected item from the spinner).
The first thing I do is to find the unique key of the selected item, then go to the kidLimit with that unique key to then use the setValue() method.
public class setLimit extends AppCompatActivity {
private DatabaseReference db;
private EditText etLimit;
private Button btnSetLimit;
private Spinner kidSpinner;
private String kidKey;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_set_limit);
etLimit = findViewById(R.id.et_limit);
btnSetLimit = findViewById(R.id.btn_confirm);
kidSpinner = findViewById(R.id.spinner_kid);
//PUTTING STRING LIST FROM FIREBASE TO SPINNER DROPDOWN STARTS HERE
db = FirebaseDatabase.getInstance().getReference().child("kids");
db.addValueEventListener(new ValueEventListener() {
#Override
public void onDataChange(#NonNull DataSnapshot dataSnapshot) {
final List<String> kid = new ArrayList<>();
for (DataSnapshot dataSnapshot1: dataSnapshot.getChildren()) {
String kidName = dataSnapshot1.child("kidName").getValue(String.class);
kid.add(kidName);
}
ArrayAdapter<String> kidNameAdapter = new ArrayAdapter<>(setLimit.this, android.R.layout.simple_spinner_item, kid);
kidNameAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
kidSpinner.setAdapter(kidNameAdapter);
}
#Override
public void onCancelled(#NonNull DatabaseError databaseError) {
}
});
//ENDS HERE
//ONCLICKLISTENER
btnSetLimit.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
findId();
String newLimit = etLimit.getText().toString().trim();
db.child(kidKey).child("kidLimit").setValue(newLimit);
}
});
}
//FINDING KEY FROM THE SELECTED SPINNER ITEM
public void findId(){
String kidName = kidSpinner.getSelectedItem().toString();
db = FirebaseDatabase.getInstance().getReference().child("kids");
db.orderByChild("kidName").equalTo(kidName).addListenerForSingleValueEvent(new ValueEventListener() {
#Override
public void onDataChange(#NonNull DataSnapshot dataSnapshot) {
for(DataSnapshot dataSnapshot1:dataSnapshot.getChildren()){
kidKey = dataSnapshot1.getKey();
}
}
#Override
public void onCancelled(#NonNull DatabaseError databaseError) {
}
});
}
}
So basically what I did was using the snapshot inside the onclick method to find the key. But when I check them on the log, it showed that the kidkey variable is null the first time I press the button, but after that it's not null anymore.
What can I to do so when I press the button, I can go to a specific child to replace it's data without getting any null pointer exception?
Here's the database that I use
When you do this
btnSetLimit.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
findId();
String newLimit = etLimit.getText().toString().trim();
db.child(kidKey).child("kidLimit").setValue(newLimit);
}
});
findId(); is executed but you don't know when it will finish, so after that method is executed and waiting for data, this line
db.child(kidKey).child("kidLimit").setValue(newLimit);
will have kidKey with a null value because it has not been pulled yet from the database, so instead, you should move your code to the onDataChange() or make a new callback when all the asynchronous process finishes
btnSetLimit.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
findId();
}
});
public void findId(){
String kidName = kidSpinner.getSelectedItem().toString();
String newLimit = etLimit.getText().toString().trim();
db = FirebaseDatabase.getInstance().getReference().child("kids");
db.orderByChild("kidName").equalTo(kidName).addListenerForSingleValueEvent(new ValueEventListener() {
#Override
public void onDataChange(#NonNull DataSnapshot dataSnapshot) {
for(DataSnapshot dataSnapshot1:dataSnapshot.getChildren()){
kidKey = dataSnapshot1.getKey();
}
db.child(kidKey).child("kidLimit").setValue(newLimit);
}
#Override
public void onCancelled(#NonNull DatabaseError databaseError) {
}
});
This is my code of how currently/specific logged in users can add to the database, I need help in retrieving the information of these specific user in a listview or recyclerView. I don't want another user to get the data of a different user.
This is also the structure of my database, within the users water bill payment details, the first node generated is the Users ID and also the next node after the Users Id is the transaction id.
Database structure:
mAuth = FirebaseAuth.getInstance();
currentID = mAuth.getCurrentUser().getUid();
databaseWater= FirebaseDatabase.getInstance().getReference().child("users water bill payment details").child(currentID);
progressBar= new ProgressDialog(this);
moneynumberwat = (EditText) findViewById(R.id.moneynumberwat);
moneypinwat = (EditText) findViewById(R.id.moneypinwat);
meterwat = (EditText) findViewById( R.id.meterwat);
user_idwat = (EditText) findViewById(R.id.user_idwat);
amountwat = (EditText) findViewById(R.id.amountwat);
modePaywat = (Spinner) findViewById(R.id.modePaywat);
Paywater = (Button) findViewById(R.id.Paywater);
Paywater.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
addPayWaterInfo();
}
});
setubk();
setupbk();
}
private void setubk() {
ImageButton btn2 = findViewById(R.id.bord);
btn2.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
finish();
Intent intent = new Intent(PayOffWater.this, Interface.class);
startActivity(intent);
}
});
}
private void setupbk() {
ImageButton btn2 = findViewById(R.id.bak);
btn2.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
finish();
Intent intent = new Intent(PayOffWater.this, Services.class);
startActivity(intent);
}
});
}
private void addPayWaterInfo() {
String moneynumw = moneynumberwat.getText().toString();
String pincodelitw = moneypinwat.getText().toString();
String meterw = meterwat.getText().toString();
String customerw = user_idwat.getText().toString();
String cashw = amountwat.getText().toString();
String mpayw = modePaywat.getSelectedItem().toString();
if( moneynumw.isEmpty()||moneynumw.length()>10 || moneynumw.length()<10 ||
pincodelitw.length()>4 || pincodelitw.length()<4 ||meterw.isEmpty()||cashw.isEmpty()|| mpayw.isEmpty()){
Toast.makeText(this,"provide correct information before payment can be successful",Toast.LENGTH_LONG).show();
} else{
String id = databaseWater.push().getKey();
com.example.iamstix_jnr.utility.PayOf.Pay pay = new Pay(moneynumw,pincodelitw,meterw,customerw,cashw,mpayw);
databaseWater.child(id).setValue(pay);
finish();
Intent intent = new Intent(PayOffWater.this,Success.class);
startActivity(intent);
}
}
You have to navigate to the last id.
databaseWater= FirebaseDatabase.getInstance().getReference().child("users water bill payment details").child(currentID).child("id of no 3.");
you have to add an ChildEventListener on your database reference and on each callback add or remove or update the adapter that you have on your recyclerview
databaseWater.addChildEventListener(new ChildEventListener() {
#Override
public void onChildAdded(#NonNull DataSnapshot dataSnapshot, #Nullable String s) {
//todo add to adapter
}
#Override
public void onChildChanged(#NonNull DataSnapshot dataSnapshot, #Nullable String s) {
//todo update adapter
}
#Override
public void onChildRemoved(#NonNull DataSnapshot dataSnapshot) {
//todo remove from adapter
}
#Override
public void onChildMoved(#NonNull DataSnapshot dataSnapshot, #Nullable String s) {
//todo update adapter
}
#Override
public void onCancelled(#NonNull DatabaseError databaseError) {
}
});
I'm using the following code to fill a list with data from a child within firebase database. The list is filled successfully, but I've got an issue: FirebaseListAdapter is being called multiple times before stopping, what does not occur when I use it in other activities.
One weird thing is that when I click a specific listView item, data from another item is passed through my openChat intent, what makes wrong data be retrieved to the chat activity I open. It seems that the calling multiple times thing is messing all the data.
Can someone point out what might be wrong with my code and/or what I must do to optimize it?
//database references
chatsRef = FirebaseDatabase.getInstance().getReference().child("chats").child(mAuth.getCurrentUser().getUid()); //the children of this are other users IDs
usersRef = FirebaseDatabase.getInstance().getReference().child("users");
////////// code for populateView I use within FirebaseListAdapter ///////////
FirebaseListAdapter<ChatUsers> firebaseListAdapter = new FirebaseListAdapter<ChatUsers>(getActivity(), ChatUsers.class, R.layout.item_user_listing, chatsRef) {
protected void populateView(View view, ChatUsers chatUsers, int position) {
TextView nameChatItemList = (TextView) view.findViewById(R.id.nameChatItemList);
id_other_user = getRef(position).getKey();
usersRef.child(id_other_user).addListenerForSingleValueEvent(new ValueEventListener() {
#Override
public void onDataChange(DataSnapshot dataSnapshot) {
//for (DataSnapshot ds : dataSnapshot.getChildren())
Toast.makeText(mActivity, dataSnapshot.getValue().toString(), Toast.LENGTH_SHORT).show();
name = dataSnapshot.child("name").getValue().toString();
}
#Override
public void onCancelled(DatabaseError databaseError) {
}
});
view.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent openChat= new Intent(getActivity().getApplicationContext(), Chat.class);
openChat.putExtra("iduser_chat", id_outro_usuario);
openChat.putExtra("name_user_chat", name);
startActivity(openChat);
}
});
}
}
EDIT Changes implemented as suggested by Farmaan
FirebaseListAdapter<ChatUsers> firebaseListAdapter = new FirebaseListAdapter<ChatUsers>(getActivity(), ChatUsers.class, R.layout.item_user_listing, ChatsRef) {
#Override
protected void populateView(View view, ChatUsers chatUsers, int position) {
TextView nomeImageChatItemList = (TextView) view.findViewById(R.id.nomeChatItemList);
String id_other_user = getRef(position).getKey();
usersRef.child(id_other_user).addListenerForSingleValue(new ValueEventListener() {
#Override
public void onDataChange(DataSnapshot dataSnapshot) {
String name = dataSnapshot.child("name").getValue().toString();
view.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
usersRef.child(id_other_user).addListenerForSingleValue(new ValueEventListener() {
#Override
public void onDataChange(DataSnapshot dataSnapshot) {
String name = dataSnapshot.child("name").getValue().toString();
Intent openChat = new Intent(getActivity().getApplicationContext(), Chat.class);
openChat.putExtra("iduser_chat", id_other_user);
openChat.putExtra("nameuser_chat", name);
startActivity(openChat);
}
#Override
public void onCancelled(DatabaseError databaseError) {
}
});
}
});
}
#Override
public void onCancelled(DatabaseError databaseError) {
}
});
}
};
Since id_other_user and name are the class level field and you are updating it every time you populate the view.So the last view which is populated will decide the user id and the name.That's wrong with your code.
chatsRef = FirebaseDatabase.getInstance().getReference().child("chats").child(mAuth.getCurrentUser().getUid()); //the children of this are other users IDs
usersRef = FirebaseDatabase.getInstance().getReference().child("users");
////////// code for populateView I use within FirebaseListAdapter ///////////
protected void populateView (View view, ChatUsuarios chatUsuarios,int position){
TextView nameChatItemList = (TextView) view.findViewById(R.id.nameChatItemList);
view.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
String id_other_user = getRef(position).getKey();
usersRef.child(id_other_user).addListenerForSingleValueEvent(new ValueEventListener() {
#Override
public void onDataChange(DataSnapshot dataSnapshot) {
//for (DataSnapshot ds : dataSnapshot.getChildren())
String name = dataSnapshot.child("name").getValue().toString();
Intent openChat = new Intent(getActivity().getApplicationContext(), Chat.class);
openChat.putExtra("iduser_chat", id_other_user);
openChat.putExtra("name_user_chat", name);
startActivity(openChat);
Toast.makeText(mActivity, dataSnapshot.getValue().toString(), Toast.LENGTH_SHORT).show();
}
#Override
public void onCancelled(DatabaseError databaseError) {
}
});
}
});
}