Kotlin
How and where to declare value so I can get result.By this code I am unable to get search result.As it is showing listview but while searching by path string. Result not showing.
some error comes with searchbar.
I have shared a picture in this if I want to search by note and task or just task then where we have to declare that child. I have declared orderByChild but then also nothing is coming when I search something in searchBar. So help me out in this .
class ToDoOverActivity : AppCompatActivity() {
lateinit var toolbar: Toolbar
lateinit var todoOver: ListView
lateinit var todoOverList: MutableList<TodoClass>
lateinit var auth: FirebaseAuth
lateinit var ref: DatabaseReference
lateinit var user: FirebaseUser
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_to_do_over)
auth = FirebaseAuth.getInstance()
user = auth.currentUser!!
todoOver = findViewById(R.id.todoOver)
todoOverList = mutableListOf()
toolbar = findViewById(R.id.toolbar)
setUpToolbar()
val searchBar = findViewById(R.id.searchBar) as MaterialSearchBar
searchBar.setHint("Search...")
searchBar.isSearchEnabled
ref = FirebaseDatabase.getInstance().getReference().child(user.uid).child("To Do Over")
ref.addValueEventListener(object : ValueEventListener {
override fun onDataChange(snapshot: DataSnapshot) {
if (snapshot!!.exists()){
todoOverList.clear()
for (h in snapshot.children){
val overTask = h.getValue(TodoClass::class.java)
todoOverList.add(overTask!!)
val adapter = TodoOverAdapter(this#ToDoOverActivity, R.layout.todo_over_layout, todoOverList)
todoOver.adapter = adapter
searchBar.addTextChangeListener(object: TextWatcher{
override fun beforeTextChanged(p0: CharSequence?, p1: Int, p2: Int, p3: Int) {
}
override fun onTextChanged(p0: CharSequence?, p1: Int, p2: Int, p3: Int) {
val searchText = searchBar.text.toString()
searchTask(searchText.toLowerCase())
adapter.getFilter().filter(p0)
}
override fun afterTextChanged(p0: Editable?) {
}
})
}
}
override fun onCancelled(error: DatabaseError) {
}
})
}
private fun searchTask(searchText: String){
ref.child("To Do Over").orderByChild("task").startAt(searchText)
.endAt("$searchText\uf8ff")
}
fun setUpToolbar(){
setSupportActionBar(toolbar)
supportActionBar?.setHomeButtonEnabled(true)
supportActionBar?.setDisplayHomeAsUpEnabled(true)
}
}
Try separating the "To Do Over" in your firebase with hyphens or CamelCase.
That is to "To-Do-Over" or ToDoOver". The aim is to make it one word and eliminate the spaces
Related
I'm newbie in coding, so I want to ask more experienced programmers how to do it right.
I have 2 functions, first from Facebook SDK and second from AppsFlyerLib.
Can you tell me if there is right option to wait results from this functions please.
Here example of code:
class MainActivity: AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?, persistentState: PersistableBundle?) {
super.onCreate(savedInstanceState, persistentState)
var linkdataPlusApps = ""
//Getting Link Data
val linkdataHandler = object : AppLinkData.CompletionHandler {
override fun onDeferredAppLinkDataFetched(appLinkData: AppLinkData?) {
linkdataPlusApps += appLinkData.toString()
}
}
AppLinkData.fetchDeferredAppLinkData(this, linkdataHandler)
//Gettings Apps
val appsdataHandler = object : AppsFlyerConversionListener {
override fun onConversionDataSuccess(p0: MutableMap<String, Any>?) {
linkdataPlusApps += p0.toString()
}
override fun onConversionDataFail(p0: String?) {}
override fun onAppOpenAttribution(p0: MutableMap<String, String>?) {}
override fun onAttributionFailure(p0: String?) {}
}
AppsFlyerLib.getInstance().init("APPS_KEY", appsdataHandler, this).start(this)
//Here I wanna take this data and put in another activity
val intent = Intent(this, NextActivity::class.java)
intent.putExtra("FetchedData", linkdataPlusApps)
startActivity(intent)
}}
But this code doesn't work because Activity started before data was fetched so string is empty.
I solved this by chaining code, but I'm sure that is dirty-coding.
How I did
class MainActivity: AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?, persistentState: PersistableBundle?) {
super.onCreate(savedInstanceState, persistentState)
var linkdataPlusApps = ""
//Getting Link Data
val linkdataHandler = object : AppLinkData.CompletionHandler {
override fun onDeferredAppLinkDataFetched(appLinkData: AppLinkData?) {
linkdataPlusApps += appLinkData.toString()
val appsdataHandler = object : AppsFlyerConversionListener {
override fun onConversionDataSuccess(p0: MutableMap<String, Any>?) {
linkdataPlusApps += p0.toString()
val intent = Intent(this#MainActivity, NextActivity::class.java)
intent.putExtra("FetchedData", linkdataPlusApps)
startActivity(intent)
}
override fun onConversionDataFail(p0: String?) {}
override fun onAppOpenAttribution(p0: MutableMap<String, String>?) {}
override fun onAttributionFailure(p0: String?) {}
}
AppsFlyerLib.getInstance().init("APPS_KEY", appsdataHandler, this#MainActivity).start(this#MainActivity)
}
}
AppLinkData.fetchDeferredAppLinkData(this, linkdataHandler)
}
}
So code starts from fetching AppLinkData, and when fetched, starting fetching apps, and only then starting second activity with right string.
Can I do it in another way?
So I've been wrestling with this for days and I need some help. I've made this code work in an activity, but then I move it to a fragment it doesn't work. Everything else is the same between the two.
Using the debugger with the working Activity, the line
apiService = retrofit.create<HomeJsonApiService>(HomeJsonApiService::class.java)
goes to getItemCount(). However in the fragment it goes directly to onCreateView in the Fragment. I've attached my code below. Thanks in advance for the help! And be gentle. I'm still new to this :)
First is my fragment:
class TabHomeActivity : Fragment() {
val itemList = ArrayList<HomeCards>()
lateinit var adapter: HomeCardsAdapter
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
var binding = FragmentTabHomeActivityBinding.inflate(layoutInflater)
adapter = HomeCardsAdapter()
var rv = binding.rvHomeCards
rv.adapter = adapter
loadData()
}
override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?,savedInstanceState: Bundle?): View? {
return inflater.inflate(R.layout.cards_home, container, false)
}
override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
super.onViewCreated(view, savedInstanceState)
}
private fun loadData() {
ApiManager.getInstance().service.listHeroes()
.enqueue(object : Callback<ResponseData<List<HomeCards>>> {
override fun onResponse(
call: Call<ResponseData<List<HomeCards>>>,
response: Response<ResponseData<List<HomeCards>>>
) {
val listData: List<HomeCards> = response.body()!!.data
// updating data from network to adapter
itemList.clear()
itemList.addAll(listData)
adapter.updateData(itemList)
adapter.notifyDataSetChanged()
}
override fun onFailure(call: Call<ResponseData<List<HomeCards>>>, t: Throwable) {
}
})
}
}
The HTTP request:
data class ResponseData<T> (
val code: Int,
val data: T
)
interface HomeJsonApiService {
#GET("marvel-heroes.asp?h=2")
fun listHeroes(): retrofit2.Call<ResponseData<List<HomeCards>>>
}
class ApiManager {
private var apiService: HomeJsonApiService? = null
init {
createService()
}
val service: HomeJsonApiService get() = apiService!!
private fun createService() {
val loggingInterceptor =
HttpLoggingInterceptor(object : HttpLoggingInterceptor.Logger {
override fun log(message: String) {
Log.i("Retrofit", message)
}
})
loggingInterceptor.level = HttpLoggingInterceptor.Level.BODY
val client = OkHttpClient.Builder()
.readTimeout(30, TimeUnit.SECONDS)
.connectTimeout(30, TimeUnit.SECONDS)
.writeTimeout(30, TimeUnit.SECONDS)
.addInterceptor(loggingInterceptor)
.build()
val retrofit: Retrofit = Retrofit.Builder()
.client(client)
.baseUrl("https://www.mywebsite.com/jsonfolder/JSON/")
.addConverterFactory(GsonConverterFactory.create())
.build()
apiService = retrofit.create(HomeJsonApiService::class.java)
}
companion object {
private var instance: ApiManager? = null
fun getInstance(): ApiManager {
return instance ?: synchronized(this) {
ApiManager().also { instance = it }
}
}
}
}
And my adapter:
class HomeCardsAdapter() : RecyclerView.Adapter<HomeCardsAdapter.ViewHolder>() {
private lateinit var itemList: List<HomeCards>
lateinit var context: Context
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolder {
context = parent.context
val view = LayoutInflater.from(context).inflate(R.layout.cards_home, parent, false)
return ViewHolder(view)
}
override fun getItemCount(): Int {
return if (::itemList.isInitialized) itemList.size else 0
}
override fun onBindViewHolder(holder: ViewHolder, position: Int) {
holder.bind()
}
fun updateData(list: List<HomeCards>) {
itemList = list;
notifyDataSetChanged()
}
inner class ViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView) {
//var binding = ActivityMainBinding(layoutInflater(inf))
fun bind() {
val item = itemList.get(adapterPosition)
ViewHolder(itemView).itemView.findViewById<TextView>(R.id.cardHomeTitle).text = item.name
ViewHolder(itemView).itemView.findViewById<TextView>(R.id.cardHomeTitle).text = item.superheroName
Glide.with(context)
.load(item.photo)
.diskCacheStrategy(DiskCacheStrategy.ALL)
.circleCrop()
.into(ViewHolder(itemView).itemView.findViewById<ImageView>(R.id.cardHomeIcon))
}
}
}
class HomeCards {
#SerializedName("superhero_name")
var superheroName: String = ""
var name: String = ""
var photo: String = ""
}
The main problem is:
var binding = FragmentTabHomeActivityBinding.inflate(layoutInflater)
That is inside on onCreate but onCreateView is returning another view inflater.inflate(R.layout.cards_home, container, false)
So you are applying the adapter to a recycler that is on the binding, but the view on the screen is inflated from the layout. Change it to this:
private lateinit var binding: FragmentTabHomeActivityBinding
override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?,savedInstanceState: Bundle?): View? {
binding = FragmentTabHomeActivityBinding.inflate(layoutInflater, container, false)
return binding.root
}
And move the code from from onCreate to onViewCreated but make sure to use the lateinit binding
override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
super.onViewCreated(view, savedInstanceState)
adapter = HomeCardsAdapter()
var rv = binding.rvHomeCards
rv.adapter = adapter
loadData()
}
After that there is a problem in your adapter: private lateinit var itemList: List<HomeCards> very specifically List<HomeCards>. The method notifyDataSetChanged doesn't work by changing or updating the reference of the data structure but when the collection is modified. Change it to this:
private val list = mutableListOf<HomeCards>()
override fun getItemCount(): Int {
return list.size()
}
fun updateData(list: List<HomeCards>) {
this.itemList.clear()
this.itemList.addAll(list)
notifyDataSetChanged()
}
If onResponse() gets called and provides response, verify that code updating UI is running on main/ui thread. Common source of issue when working with network (other threads).
activity?.runOnUiThread {
itemList.clear()
itemList.addAll(listData)
adapter.updateData(itemList)
adapter.notifyDataSetChanged()
}
I want items to change color when the user selects them. But when an item changes color, another item changes in the same way, I don't know why this error occurs, this is the code
I am using a listview and a simpleCursorAdapter, with a LoaderManager.
class MainActivity : AppCompatActivity(), LoaderManager.LoaderCallbacks<Cursor>,AdapterView.OnItemClickListener{
var cols=listOf<String>(
ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME,
ContactsContract.CommonDataKinds.Phone.NUMBER,
ContactsContract.CommonDataKinds.Phone._ID,
ContactsContract.CommonDataKinds.Phone.LOOKUP_KEY
).toTypedArray()
lateinit var listView1:ListView
lateinit var adapter:SimpleCursorAdapter
lateinit var cursor:Cursor
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
val binding=ActivityMainBinding.inflate(layoutInflater)
setContentView(binding.root)
if(ActivityCompat.checkSelfPermission(this, permission.READ_CONTACTS) != PackageManager.PERMISSION_GRANTED){
ActivityCompat.requestPermissions(this,Array(1){ Manifest.permission.READ_CONTACTS},111)
}else {
var from=listOf<String>(ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME,
).toTypedArray()
var to = intArrayOf(R.id.name)
adapter = SimpleCursorAdapter(this,
R.layout.list_item_contacts,
null,
from,
to,0)
listView1=findViewById<ListView>(R.id.listView1) as ListView
LoaderManager.getInstance(this).initLoader(1, null, this)
}
listView1.onItemClickListener=this
}
override fun onRequestPermissionsResult(requestCode: Int, permissions: Array<out String>, grantResults: IntArray) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults)
if(requestCode==111 && grantResults[0]==PackageManager.PERMISSION_GRANTED){
LoaderManager.getInstance(this).initLoader(1,null,this)
}
}
override fun onCreateLoader(id: Int, args: Bundle?): Loader<Cursor> {
return CursorLoader(applicationContext,
ContactsContract.CommonDataKinds.Phone.CONTENT_URI,
cols,
null,
null,
ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME
)
}
override fun onLoadFinished(loader: Loader<Cursor>, data: Cursor?) {
adapter.swapCursor(data)
listView1.adapter=adapter
}
override fun onLoaderReset(loader: Loader<Cursor>) {
adapter.swapCursor(null)
listView1.adapter=adapter
}
#RequiresApi(Build.VERSION_CODES.LOLLIPOP)
override fun onItemClick(parent: AdapterView<*>?, view: View?, position: Int, id: Long) {
view?.setBackgroundColor(Color.argb(96,189,189,189))
}
}
And this is the result enter image description here
example: when pressing the name of "angela" the name of "center of attention" is marked
I don't know if there is any other function that I don't know, it should be noted that I am a beginner in Android programming.
you can disable view recycling by doing this
adapter = object : SimpleCursorAdapter(
this,
R.layout.list_item_contacts,
null,
from,
to,
0
) {
override fun getItemViewType(position: Int) = position
override fun getViewTypeCount() = count
}
I don't know why it's says me that "java.lang.IndexOutOfBoundsException: Index: 0, Size: 0"
I've been searching for this since 2 hours, and i don't know why there is this problem now, can you help me ? I want to pass data from apiRest into another activity with intent and putExtra/getExtra (I will do with firebase later, more simple and more easy way).
Main Activity
package com.mehdi.myapplication
class MainActivity : AppCompatActivity(), ListAdapter.OnItemClickListener {
lateinit var userAdapter: ListAdapter
var lm = LinearLayoutManager(this)
private val users: MutableList<Results> = mutableListOf()
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
initView()
getClassApiRet()
}
override fun onItemClick(position: Int) {
Toast.makeText(this, position.toString(), Toast.LENGTH_LONG).show()
val intent = Intent(this, DetailPageActivity::class.java)
intent.putExtra("email", users[position].email)
startActivity(intent)
}
fun initView() {
UserRecycleView.layoutManager = lm
userAdapter = ListAdapter(this, this)
UserRecycleView.adapter = userAdapter
}
fun getClassApiRet() {
val retro = Instance().getRetroInstance().create(ClassApiRest::class.java)
retro.getData().enqueue(object : Callback<ClassApi> {
override fun onResponse(call: Call<ClassApi>, response: Response<ClassApi>) {
val users = response.body()
runOnUiThread {
userAdapter.setUsers(users?.results!!)
}
}
override fun onFailure(call: Call<ClassApi>, t: Throwable) {
Log.e("Failed", t.message.toString())
}
})
}
}
UserInfo
class ClassApi {
#SerializedName("results")
#Expose
val results: List<Results>? = null
}
class Results {
#SerializedName("name")
#Expose
val name: Name? = null
#SerializedName("email")
#Expose
val email: String? = null
#SerializedName("login")
#Expose
val login: Login? = null
#SerializedName("picture")
#Expose
val picture: Picture? = null
}
class Name {
#SerializedName("title")
#Expose
val title: String? = null
#SerializedName("first")
#Expose
val first: String? = null
#SerializedName("last")
#Expose
val last: String? = null
}
class Login {
#SerializedName("username")
#Expose
val username: String? = null
}
class Picture {
#SerializedName("medium")
#Expose
val medium: String? = null
#SerializedName("large")
#Expose
val large: String? = null
}
ListAdapter
class ListAdapter(val context: Context, val listener: OnItemClickListener): RecyclerView.Adapter<ListAdapter.UsersViewHolder>() {
private val users: MutableList<Results> = mutableListOf()
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ListAdapter.UsersViewHolder {
return UsersViewHolder(LayoutInflater.from(context).inflate(R.layout.row_user_list, parent, false))
}
override fun onBindViewHolder(holder: ListAdapter.UsersViewHolder, position: Int) {
holder.bindModel(users[position])
}
override fun getItemCount(): Int {
return users.size
}
fun setUsers(results: List<Results>) {
users.clear()
users.addAll(results)
notifyDataSetChanged()
}
inner class UsersViewHolder(item: View) : RecyclerView.ViewHolder(item), View.OnClickListener {
val UserImage: CircleImageView = item.findViewById(R.id.UserImage)
val UserName: TextView = item.findViewById(R.id.UserName)
val UserPseudo: TextView = item.findViewById(R.id.UserPseudo)
init {
itemView.setOnClickListener(this)
}
fun bindModel(b: Results) {
UserName.text = b.name?.first
UserPseudo.text = b.login?.username
val url = b.picture?.medium
Glide.with(UserImage)
.load(url)
.placeholder(R.drawable.ic_launcher_background)
.error(R.drawable.ic_launcher_background)
.fallback(R.drawable.ic_launcher_foreground)
.into(UserImage)
}
override fun onClick(v: View?) {
val position = adapterPosition
if (position != RecyclerView.NO_POSITION) {
listener.onItemClick(position)
}
}
}
interface OnItemClickListener {
fun onItemClick(position: Int)
}
}
Edit !!!
I think the probleme is with the position and the interface, he can't get data.
ListAdapter
override fun onClick(v: View?) {
val position = adapterPosition
if (position != RecyclerView.NO_POSITION) {
listener.onItemClick(position)
}
}
}
interface OnItemClickListener {
fun onItemClick(position: Int)
}
Main Activity
override fun onItemClick(position: Int) {
Toast.makeText(this, users[position].email.toString(), Toast.LENGTH_LONG).show()
val intent = Intent(this, DetailPageActivity::class.java)
//intent.putExtra("lolipop", users[position].toString())
startActivity(intent)
}
Your response listener is passing the list of users to the ListAdapter, but it doesn't do anything to the MainActivity's users property, so that list remains empty. Then your item click listener tries to access the user by index in that empty list.
I would remove the users property from the Activity since there is no practical use for it. In your ListAdapter, change the onItemClick function of the OnItemClickListener to pass the actual User instead of the User's position in the data. You can get the actual User using the adapterPosition from within the adapter, since it owns the users list.
Edit: I'm suggesting to change your listener function signature to return an item directly. There's no reason the Activity should have to find the item in the collection when the Adapter can just provide it directly.
// ListAdapter:
override fun onClick(v: View?) {
listener.onItemClick(users[adapterPosition])
}
interface OnItemClickListener {
fun onItemClick(results: Results)
}
I'm parsing API and it's logging in the logcat, but I have a problem while retrieving it and using that data in a recycleview. These are my code snippets:
class MainActivity : AppCompatActivity() {
private val users = arrayListOf<User>()
private lateinit var adapter: RecyclerViewAdapter
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
init()
}
private fun init() {
adapter = RecyclerViewAdapter(users)
recyclerView.layoutManager = LinearLayoutManager(this)
recyclerView.adapter = adapter
val myViewModel : UsersViewModel by viewModel()
myViewModel.getAllUsers().observe(this, Observer {
users.add(it)
adapter.notifyDataSetChanged()
})
myViewModel.getUsers()
d("allUsers", users.size.toString())
}
}
I cannot set the data in a recyclerview, can anyone give me a hint? I could not find a proper source or code snippet to understand how I'm able to parse the data using a converter.
class UsersRequest {
private var retrofit = Retrofit.Builder()
.baseUrl("https://reqres.in/api/")
.addConverterFactory(ScalarsConverterFactory.create())
.build()
private var service = retrofit.create(ApiService::class.java)
interface ApiService {
#GET("users?page=1")
fun getRequest(): Call<String>
}
fun getRequest(callback: CustomCallback) {
val call = service.getRequest()
call.enqueue(onCallback(callback))
}
private fun onCallback(callback: CustomCallback): Callback<String> = object : Callback<String> {
override fun onFailure(call: Call<String>, t: Throwable) {
d("response", "${t.message}")
callback.onFailure(t.message.toString())
}
override fun onResponse(call: Call<String>, response: Response<String>) {
d("response", "${response.body()}")
callback.onSuccess(response.body().toString())
}
}
}
class RecyclerViewAdapter(private val users: ArrayList<User>) :
RecyclerView.Adapter<RecyclerViewAdapter.ViewHolder>() {
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolder {
return ViewHolder(
LayoutInflater.from(parent.context).inflate(
R.layout.user_layout,
parent,
false
)
)
}
override fun onBindViewHolder(holder: ViewHolder, position: Int) {
return holder.onBind()
}
override fun getItemCount() = users.size
private lateinit var user:User
inner class ViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView) {
fun onBind() {
user = users[adapterPosition]
itemView.name.text = user.first_name
}
}
}
User(
val id: Int,
val email: String,
val first_name: String,
val last_name: String,
val avatar: String
)
with adapter class RecyclerViewAdapter(private val users: MutableList<User>) : RecyclerView.Adapter<RecyclerViewAdapter.ViewHolder>() { ...
Add this method to your adapter :
fun setUsers(usersList: List<User>) {
this.users.clear()
this.users.addAll(usersList)
notifyDataSetChanged()
}
and in MainActivity simply put :
myViewModel.getAllUsers().observe(this, Observer {
users -> hideLoading() // If you have a progress bar, here you can hide it
users?.let {
adapter.setUsers(users) }
})