Develop Reference

why is the key not added to the data in firebase?

I've been struggling with the problem for a long time and I can't solve it.I'm in EditActivity trying to add a key to the data from the firebase that I get from it with the help of Ad and process it using the AdsManager.
The key should not be equal to zero. In this line I check if the key is zero, then the Firebase writes data to empty.db.child (ad.key?: "Empty"). SetValue (ad). When I load the data to the Firebase, it shows them empty. Without displaying the key. You know what the problem is?
Ad
data class Ad(
var user_id : String? = null ,
var name : String? = null ,
var button1 : String? = null ,
val textTex : String? = null ,
val textk : String? = null ,
val description : String? = null,
val name_ads: String?=null,
val key :String? =null
)
AdsManager
class AdsManager(val readDataColbak : ReadDataColbak?) {
private lateinit var auth: FirebaseAuth
val db =Firebase.database.getReference("main")
fun pubilshAd(ad :Ad) {
db.child(ad.key?: "empty").setValue(ad)
}
fun ReadDataDb() {
db.addListenerForSingleValueEvent(object :ValueEventListener{
override fun onDataChange(snapshot : DataSnapshot) {
val adArray =ArrayList<Ad>()
for (item in snapshot.children){
val ad =item.children.iterator().next().child("ad").getValue(Ad::class.java)
adArray.add(ad !!)
}
readDataColbak?.readData(adArray)
}
override fun onCancelled(error : DatabaseError) {
}
})
}
}
EditActivity1
class EditActivity1: AppCompatActivity(), FfragmentInterfes{
lateinit var mBinder : ActivityEdit1Binding
private var dialog=D()
private var chooseImageFrog:FragmentList? =null
val adsManager = AdsManager(null)
public override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
imageAdapter = ImageAdapter()
mBinder=ActivityEdit1Binding.inflate(layoutInflater)
setContentView(mBinder.root)
init()
}
fun onClickPublish(view : View) {
adsManager.pubilshAd(fillAd())
}
private fun fillAd() : Ad {
var ad : Ad
mBinder.apply {
ad= Ad(
name_ads.text.toString(),
user_id.text.toString(),
name.text.toString(),
button1.text.toString(),
description.text.toString(),
textk.text.toString(),
adsManager.db.push().key
)
}
return ad
}

App is crashing when i try to run it. Firebase authentication with MVVM and Navigation Component in Kotlin

I'm trying to build a simple app where the user enters his email address to sign up over Firebase with MVVM (Model View ViewModel).
when i try to observe the data in the view inside a fragment from the ViewModel the whole app crashes.
The error message says: Error inflating class androidx.fragment.app.FragmentContainerView
But when i remove the observing part from the View(The Login fragment the app runs correctlly)
Can someone help me to fix that problem?
the App Repository
class AppRepo {
private var application: Application? = null
val userMutableLiveData: MutableLiveData<FirebaseUser>? = null
val loggedOutMutableLiveData: MutableLiveData<Boolean>? = null
val usernameMutableLiveData: MutableLiveData<String>? = null
val uriProfilePicMutableLiveData: MutableLiveData<Uri>? = null
private var firebaseAuth: FirebaseAuth? = null
constructor(application: Application?) {
this.application = application
firebaseAuth = FirebaseAuth.getInstance()
if (firebaseAuth!!.currentUser != null) {
val userID = Objects.requireNonNull(FirebaseAuth.getInstance().currentUser)!!
.uid
userMutableLiveData!!.postValue(firebaseAuth!!.currentUser)
}
}
#RequiresApi(api = Build.VERSION_CODES.P)
fun loginUsers(email: String?, password: String?) {
firebaseAuth!!.signInWithEmailAndPassword(email!!, password!!).addOnCompleteListener(
application!!.mainExecutor,
{ task ->
if (task.isSuccessful) {
userMutableLiveData!!.postValue(firebaseAuth!!.currentUser)
} else {
Toast.makeText(
application,
"Logging in failed: " + task.exception,
Toast.LENGTH_LONG
).show()
}
})
}
#JvmName("getUserMutableLiveData1")
fun getUserMutableLiveData(): MutableLiveData<FirebaseUser>? {
return userMutableLiveData
}
}
the ViewModel
open class ViewModel(application: Application) : AndroidViewModel(application) {
private var appRepo: AppRepo? = null
private var userMutableLiveData: MutableLiveData<FirebaseUser>? = null
private var loggedOutMutableLiveData: MutableLiveData<Boolean>? = null
private var documentSnapshotMutableLiveData: MutableLiveData<String>? = null
private var uriProfilePocMutableLiveData: MutableLiveData<Uri>? = null
open fun ViewModel(application: Application) {
appRepo = AppRepo(application)
userMutableLiveData = appRepo!!.getUserMutableLiveData()
loggedOutMutableLiveData = appRepo!!.getLoggedOutMutableLiveData()
documentSnapshotMutableLiveData = appRepo!!.getUsernameMutableLiveData()
uriProfilePocMutableLiveData = appRepo!!.getUriProfilePicMutableLiveData()
}
#RequiresApi(Build.VERSION_CODES.P)
open fun login(email: String?, password: String?) {
appRepo!!.loginUsers(email, password)
}
open fun getUserMutableLiveData(): MutableLiveData<FirebaseUser>? {
return userMutableLiveData
}
open fun getUsernameMutableLiveData(): MutableLiveData<String>? {
return documentSnapshotMutableLiveData
}
open fun getUriProfilePocMutableLiveData(): MutableLiveData<Uri>? {
return uriProfilePocMutableLiveData
}
}
the LoginFragment
abstract class LoginFragment : Fragment() {
private var emailEditText: EditText? = null
private var passwordEditText:EditText? = null
private var loginButton: Button? = null
private var signupButton: Button? = null
private var resetPasswordButton:Button? = null
private var viewModel: ViewModel? = null
#RequiresApi(Build.VERSION_CODES.P)
override fun onCreateView(
inflater: LayoutInflater,
container: ViewGroup?,
savedInstanceState: Bundle?
): View? {
val view = inflater.inflate(R.layout.fragment_login, container, false)
emailEditText = view.findViewById(R.id.username)
passwordEditText = view.findViewById(R.id.password)
loginButton = view.findViewById(R.id.login)
loginButton!!.setOnClickListener(View.OnClickListener {
val email = emailEditText!!.getText().toString().trim { it <= ' ' }
val password = passwordEditText!!.getText().toString().trim { it <= ' ' }
if (email.isNotEmpty() && password.isNotEmpty()) {
viewModel!!.login(email, password)
}
})
return view
}
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
viewModel = ViewModelProvider(this).get(ViewModel::class.java)
activity?.let {
viewModel!!.getUserMutableLiveData()!!.observe(
it,
{ firebaseUser ->
if (firebaseUser != null) {
Navigation.findNavController(requireView())
.navigate(R.id.action_loginFragment3_to_mainUIFragment)
}
})
}
}
}
XML File MainActivity
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".ui.MainActivity">
<androidx.fragment.app.FragmentContainerView
android:id="#+id/fragmentContainerView"
android:name="androidx.navigation.fragment.NavHostFragment"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:defaultNavHost="false"
app:navGraph="#navigation/nav_graph"
tools:layout_editor_absoluteX="17dp"
tools:layout_editor_absoluteY="221dp" />
</androidx.constraintlayout.widget.ConstraintLayout>

Keyboard input hides new entry in the recycleview adapter

I am using a recycleview to display latest inputs from the user. When I click edit text, the old inputs move up and the keyboard shows in the app. But when I enter the next entry, I have to minimize the keyboard to be able to see the new entry. It doesnt move up - this was expected behaviour as the recycleview is updated.
Stage 1)
Old Entry
Old Entry
Stage 2) Click edit text to make new entry
Old Entry
Old Entry
Keyboard
Stage 3) New text is entered
Old Entry
Old Entry
Keyboard
Stage 4) Keyboard is hidden,/minimized
Old Entry
Old Entry
New Entry
The layout is stacked from the end... what can I change to make this work?
AndroidManifest setting
<activity
android:name=".Contacts.ui.ContactDetailsHome"
android:configChanges="orientation"
android:parentActivityName=".MainActivity"
android:screenOrientation="portrait"
android:windowSoftInputMode="adjustResize" />
fragment code
class ContactRelationship : Fragment() {
companion object {
#JvmStatic
fun start(context: Context, contact: Contact?, isEdit: Boolean) {
val starter = Intent(context, ContactRelationship::class.java)
.putExtra("contact", contact as Serializable)
.putExtra("Edit", isEdit)
context.startActivity(starter)
}
}
private val _updatesLiveData = MutableLiveData<ArrayList<ContUPDt>>()
private val updatesLiveData: LiveData<ArrayList<ContUPDt>> = _updatesLiveData
var firebaseUser: FirebaseUser? = null //the used id of the user using the app
var userLookupKey: String = ""
private lateinit var contact: Contact
var mupdateList: List<ContUPDt>? = null
var contUpdateAdapter: ContUpdateAdapter? = null
var reference: DatabaseReference? = null
lateinit var rvContRelUpdate: RecyclerView
private lateinit var progressBar: ProgressDialog
override fun onCreateView(
inflater: LayoutInflater, container: ViewGroup?,
savedInstanceState: Bundle?
): View {
// Inflate the layout for this fragment
val view: View =
inflater.inflate(R.layout.fragment_view_contact_relationship, container, false)
progressBar = ProgressDialog(activity)
progressBar.setCancelable(false)
firebaseUser = FirebaseAuth.getInstance().currentUser
rvContRelUpdate = view.findViewById(R.id.rvContRelUpdate)
rvContRelUpdate.setHasFixedSize(true)
val linearLayoutManager = LinearLayoutManager(activity)
linearLayoutManager.stackFromEnd = true
rvContRelUpdate.layoutManager = linearLayoutManager
return view
}
override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
super.onViewCreated(view, savedInstanceState)
contact = (activity?.intent?.getSerializableExtra("contact") as Contact)
//assigning it to fields to be displayed
userLookupKey = contact.lookupKey
val contId = contact.id
//get updates
retrieveUpdates(userLookupKey)
//Implementing Send Update
send_update_btn.setOnClickListener {
val updateTxt = text_messageact.text.toString()
if (updateTxt == "") {
Toast.makeText(activity, "The update is empty.", Toast.LENGTH_LONG)
.show()
} else {
sendMessageToUser(userLookupKey, contId, updateTxt)
}
text_messageact.setText("")
}
private fun sendMessageToUser(userLookupKey: String, contId: String, updateMsg: String) {
val currentCalendar = Calendar.getInstance()
//creating object in DB
val db = activity?.let { AppDatabase.getDatabase(it) }
val ev = ContUPDt(
0,
userLookupKey,
contId,
currentCalendar.timeInMillis,
updateMsg,
null,
"Update"
)
db!!.ContUpdateDao().addcontUpdate(ev)
}
private fun retrieveUpdates(userLookupKey: String) {
val mupdateList = ArrayList<ContUPDt>()
val db = AppDatabase.getDatabase(requireActivity())
db.ContUpdateDao().getcontUpdate(userLookupKey).observe(viewLifecycleOwner, Observer {
val contUpdt = it
mupdateList.clear()
for (i in contUpdt) {
mupdateList.add(i)
}
})
contUpdateAdapter = ContUpdateAdapter(requireActivity(), mupdateList)
rvContRelUpdate.adapter = contUpdateAdapter
}
}
Adapter code
class ContUpdateAdapter(
mContext: Context,
mupdateList: List<ContUPDt>
) : RecyclerView.Adapter<ContUpdateAdapter.ViewHolder?>() {
private val mContext: Context
private val mupdateList: List<ContUPDt>
init {
this.mContext = mContext
this.mupdateList = mupdateList
}
class ViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView) {
var updateDTTime: TextView? = null
var updateMessage: TextView? = null
var updateType: TextView? = null
init {
updateDTTime = itemView.findViewById(R.id.updateDTTime)
updateMessage = itemView.findViewById(R.id.updateMessage)
updateType = itemView.findViewById(R.id.updateType)
}
}
override fun onCreateViewHolder(
parent: ViewGroup,
position: Int
): ViewHolder {
return ViewHolder (
LayoutInflater.from(parent.context)
.inflate(R.layout.contactupdate, parent, false)
)
}
override fun onBindViewHolder(holder: ViewHolder, position: Int) {
val contUpdte: ContUPDt = mupdateList[position]
val formatter = SimpleDateFormat(" E, HH:MM a, dd MMM yyyy", Locale.getDefault())
val updatetime = formatter.format(contUpdte.timestamp)
holder.updateDTTime!!.text = updatetime
holder.updateMessage!!.text = contUpdte.update
holder.updateType!!.text = contUpdte.actType
}
override fun getItemCount(): Int {
return mupdateList.size
}
}

Just scroll RecyclerView to last position after adding new item:
rvContRelUpdate.scrollToPosition(contUpdateAdapter.itemCount - 1)

Data Binding not working for textView while using some function

First I have declared the variables in the layout file
<data>
<variable
name="signUpViewModel"
type="ac.connect.ui.signup.SignUpViewModel" />
</data>
Now I'm trying to use a function of StringExtension class which takes string value as parameter and to set the result to textView
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:padding="20dp"
android:textStyle="bold"
android:background="#C1BDBD"
android:textColor="#3D3C3C"
app:capitalizeFirstLetter="#{signUpViewModel.name}" />
capitalize First Letter function
fun capitalizeFirstLetter(value: String): String {
var ans = ""
val words = value.split(" ")
words.forEach {
ans += it.capitalize() + " "
}
return ans
}
ViewModel
class SignUpViewModel(private val setProfileUseCase: SetProfileUseCase) :
ViewModel() {
private val _profile = MutableLiveData<ProfileModel>()
val profile: LiveData<ProfileModel>
get() = _profile
private val _name = MutableLiveData<String>()
val name: LiveData<String>
get() = _name
fun setName(name: Editable) {
_name.value = name.toString()
}
fun setProfileData() {
viewModelScope.launch {
val profile = ProfileModel(
name = "kamal nayan",
branch = "CSE",
gender = "Male",
mobileNumber = "+91-73555555517",
rollNo = "GCS/345353",
uid = "ghafagaraggGGG"
)
val response = setProfileUseCase.invoke(profile)
_profile.value = profile
response.successOrError(::handleProductDetailsSuccess, ::handleSignUpFailure)
}
}
private fun handleProductDetailsSuccess(response: Boolean) {
_name.value = "User Data Uploaded Successfully"
}
private fun handleSignUpFailure(failure: Failure, error: ErrorResponse?) {
Timber.log(Log.ERROR, error?.message)
}
}
Fragment Code:
class SignUpFragment : Fragment(R.layout.fragment_sign_up) {
private val viewModel: SignUpViewModel by viewModel()
private var binding by autoCleared<FragmentSignUpBinding>()
override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
super.onViewCreated(view, savedInstanceState)
binding = FragmentSignUpBinding.bind(view)
binding.signUpViewModel = viewModel
binding.lifecycleOwner = this
binding.signUp.setOnClickListener {
viewModel.setProfileData()
}
}
companion object {
fun newInstance(): SignUpFragment {
return SignUpFragment()
}
}
}
The output is blank , like no text in the textView
Kindly help me with this, Thanks in advance.

I think the problem is you are not setting the value of the variable stringExtensions when setting up your DataBinding
import ac.connect.utils.StringExtensions
override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
super.onViewCreated(view, savedInstanceState)
binding = FragmentSignUpBinding.bind(view)
binding.signUpViewModel = viewModel
// binding.stringExtensions = StringExtensions() // If it is a class
// binding.stringExtensions = StringExtensions // If it is an object
binding.lifecycleOwner = this
binding.signUp.setOnClickListener {
viewModel.setProfileData()
}
}

If I understand right you need make BindingAdapter. So you need rewrite your 'capitalizeFirstLetter' function as below.
#BindingAdapter("app:capitalizeFirstLetter")
#JvmStatic fun capitalizeFirstLetter(textView: TextView, value: String){
var ans = ""
val words = value.split(" ")
words.forEach {
ans += it.capitalize() + " "
}
textView.setText(ans)
}
Also I didn't see where you call setName function. Are you sure that _name.value is not empty?

Getting Null exception in Toast inside fragment

Here's the code where i am getting exception, tried various ways to implement context but nothing is working out.
class GrowthStoryFragment : Fragment() {
private val TAG = "GrowthStoryFragment"
companion object{
private var countryID = "1"
private var date = "MAT TY"
private var spec = "val"
private var businessUnitID = "2"
private var category = "Fresh Milk"
private var firstReportTypeId = "1" //fixed for growth story and share story
private var isGroup = "false" //fixed to false
}
private val backendApi = WinRetrofitHelper.winApiInstance()
override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?,
savedInstanceState: Bundle?): View? {
return inflater.inflate(R.layout.fragment_growth_story, container, false)
}
override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
super.onViewCreated(view, savedInstanceState)
getSpinnerResponse(businessUnitID, isGroup,firstReportTypeId)
getSuperRegionName(countryID, date,spec," ",businessUnitID, category, firstReportTypeId, isGroup)
growth_spinner.onItemSelectedListener = object : AdapterView.OnItemSelectedListener{
override fun onNothingSelected(parent: AdapterView<*>?) {
}
override fun onItemSelected(parent: AdapterView<*>?, view: View?, position: Int, id: Long) {
val item = parent?.getItemAtPosition(position) as RespTwo
category = item.nameValue
Log.e(TAG,"Category name is: " + category)
getSuperRegionName(countryID, date,spec," ",businessUnitID, category, firstReportTypeId, isGroup)
}
}
}
private fun getSpinnerResponse(businessUnitID: String, isGroup: String, firstReportTypeId: String){
val request = backendApi.getCategoryBusinessUnit(businessUnitID, isGroup, firstReportTypeId)
request.enqueue(object : Callback<List<RespTwo>> {
override fun onFailure(call: Call<List<RespTwo>>?, t: Throwable?) {
Log.e(TAG, "Failure Super Region Name: ")
}
override fun onResponse(call: Call<List<RespTwo>>?, response: Response<List<RespTwo>>?) {
val myresponse = response?.body()
if (response?.body() != null && !response?.body()!!.isEmpty()) {
growth_spinner.adapter = GrowthSpinnerAdapter(response?.body())
Log.e(TAG, "Super Region Name: " + myresponse?.get(0)?.nameValue)
} else {
Toast.makeText(context!!.applicationContext, "Data Not Available!", Toast.LENGTH_LONG).show()
}
}
})
}
private fun getSuperRegionName(countryID: String, date: String, spec: String, superMarket: String,businessUnitID: String, category: String, firstReportTypeId: String, isGroup: String) {
val request = backendApi.getSuperRegion(countryID)
request.enqueue(object : Callback<List<RespMy>> {
override fun onFailure(call: Call<List<RespMy>>?, t: Throwable?) {
Log.e(TAG, "Failure Super Region Name: ")
}
override fun onResponse(call: Call<List<RespMy>>?, response: Response<List<RespMy>>?) {
val myresponse = response?.body()
if (response?.body() != null && !response?.body()!!.isEmpty()) {
getDataFromApi(countryID, date, spec, myresponse?.get(0)!!.nameValue, businessUnitID, category, firstReportTypeId, isGroup)
Log.e(TAG, "Super Region Name: " +countryID+" "+ date+" "+ spec+" "+ myresponse?.get(0)?.nameValue+" "+businessUnitID+" "+ category+" "+ firstReportTypeId+" " + isGroup+" ")
} else {
Toast.makeText(myApplicationContext, "Data Not Available!", Toast.LENGTH_LONG).show()
}
}
})
}
}
Please suggest something and i have heard a viewModel conversion of the requests made directly from fragments can fix this out but i don't know how to do that. Please help in either way.
Update:
Don't want to use static context here

ViewModel and Repository pattern is way to go.
You are doing async network call on Main thread, very bad idea.
For learning purposes - here is how to get your code working:
replace:
myApplicationContext = context!!.applicationContext
with:
myApplicationContext = requireContext()
or better - get rid of this variable entirely and just use requireContext() instead.

Toasts are usually applied to the activity rather than an generic context, and demanding the context via context!! should be avoided; it is optional for a reason. I would try the following after defining #string/data_not_available and #string/super_region_name_template in the string resource xml:
val body = response?.body()
if (body?.isNotEmpty() == true) {
growth_spinner.adapter = GrowthSpinnerAdapter(body)
Log.e(TAG, getString(R.string.super_region_name_template, body.get(0).nameValue)) // if applicable, use .first() over .get(0)
} else {
activity?.run {
Toast.makeText(this, getString(R.string.data_not_available), Toast.LENGTH_LONG).show()
}
}

try to use this
myApplicationContext: Context = this.context ?: return
then
Toast.makeText(myApplicationContext, "Data Not Available!",Toast.LENGTH_LONG).show()
for more details, you can see this link