I am a novice in Android development. I am currently working in fragments. So basically I am having two fragments each have their own Edittext and buttons. On back press between fragments works fine but when using the button to move to the next fragment the second fragment fails to hold the edit text value. I tried OnSavedInstance it doesn't help me.
FirstFragment.kt
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
arguments?.let {
param1 = it.getString(ARG_PARAM1)
param2 = it.getString(ARG_PARAM2)
}
}
override fun onCreateView(
inflater: LayoutInflater, container: ViewGroup?,
savedInstanceState: Bundle?
): View? {
// Inflate the layout for this fragment
val view = inflater.inflate(R.layout.fragment_first, container, false)
view.findViewById<Button>(R.id.btn1).setOnClickListener {
ediText1 = view.findViewById<EditText>(R.id.et1).text.toString()
Toast.makeText(activity?.baseContext,ediText1,Toast.LENGTH_SHORT).show()
Navigation.findNavController(view).navigate(R.id.action_firstFragment_to_secondFragment)
}
return view
}
SecondFragment.kt
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
arguments?.let {
param1 = it.getString(ARG_PARAM1)
param2 = it.getString(ARG_PARAM2)
}
}
override fun onCreateView(
inflater: LayoutInflater, container: ViewGroup?,
savedInstanceState: Bundle?
): View? {
// Inflate the layout for this fragment
val view = inflater.inflate(R.layout.fragment_second, container, false)
view.findViewById<Button>(R.id.btn2).setOnClickListener {
ediText2 = view.findViewById<EditText>(R.id.et2).text.toString()
Toast.makeText(activity?.baseContext,ediText2, Toast.LENGTH_SHORT).show()
Navigation.findNavController(view).navigate(R.id.action_secondFragment_to_thirdFragment) }
return view
}
There are many ways to retain the values, most easy is to use ViewModel , since you are using Navigation Components , ViewModel can be scoped to navGraph , see this
Related
I created a popup window with rounded corners in a fragment but when I open it I can see a dark background behind the popup. Can you tell how to delete it or make ir transparent?
I'm using kotlin.
This is my fragment code (the activity with an image that opens the popup on click):
`
class ProfileFragment : Fragment() {
override fun onCreateView(
inflater: LayoutInflater, container: ViewGroup?,
savedInstanceState: Bundle?
): View? {
// Inflate the layout for this fragment
return inflater.inflate(R.layout.fragment_profile, container, false)
}
override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
super.onViewCreated(view, savedInstanceState)
val bpMore: ImageView = view.findViewById(R.id.ic_bp_more)
bpMore.setOnClickListener {
val showPopUp = BadgesPopUpFragment()
showPopUp.show((activity as AppCompatActivity).supportFragmentManager, "showPopUp")
}
}
`
And this is my popup fragment code (popup window):
`
class BadgesPopUpFragment : DialogFragment() {
override fun onCreateView(
inflater: LayoutInflater, container: ViewGroup?,
savedInstanceState: Bundle?
): View? {
// Inflate the layout for this fragment
return inflater.inflate(R.layout.fragment_badges_pop_up, container, false)
}
}
`
I have been trying to figure this out for a bit now. I see a lot of developers and youtubers (tutorials) saying that we should use as little activities as possible in order for a faster, more efficient and less resource heavy code/app. I was wondering if there is a way to create a Log-in and Sign-up using only the MainActivity for both Log-in and Sign-Up in combination with fragments for navigation between them.
Or
Do we need atleast 2 or more activities to handle that process ( Log-in & Sign-Up )?
Example: 1 activity for log-in and 1 activity for sign-up.
Appreciate and welcome any answers regarding this topic!
Theoretically, you could have your entire application run on a single Activity and use Fragments for all of the pages.
Each fragment has its own lifecycle within the activity.
MainActivity can look like this
class MainActivity : AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
loadFragment(2)
}
public fun loadFragment(page: Int){
if(page == 1){
// load login
val manager = supportFragmentManager.beginTransaction()
manager.replace(R.id.fragment_holder, LoginFragment()).commit()
}else{
// load register
val manager = supportFragmentManager.beginTransaction()
manager.replace(R.id.fragment_holder, LoginFragment()).commit()
}
}
}
LoginFragment can look like this
class LoginFragment : Fragment() {
lateinit var myButton: Button
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
}
override fun onCreateView(
inflater: LayoutInflater, container: ViewGroup?,
savedInstanceState: Bundle?
): View? {
// Inflate the layout for this fragment
val view = inflater.inflate(R.layout.fragment_login, container, false)
myButton = view.findViewById(R.id.my_button)
myButton.apply {
setOnClickListener { toRegister() }
}
return view;
}
fun toRegister(){
// replace the fragment in main activity with register fragment
(requireActivity() as MainActivity).loadFragment(1)
}
}
RegisterFragment can look like this
class RegisterFragment : Fragment() {
lateinit var mButton: Button
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
}
override fun onCreateView(
inflater: LayoutInflater, container: ViewGroup?,
savedInstanceState: Bundle?
): View? {
// Inflate the layout for this fragment
val view = inflater.inflate(R.layout.fragment_register, container, false)
mButton = view.findViewById(R.id.my_button)
mButton.apply {
setOnClickListener { toLogin() }
}
return view;
}
fun toLogin(){
// replacing the fragment in the main activity with the login fragment
(requireActivity() as MainActivity).loadFragment(1)
}
}
Basically, we replace the fragment displayed in the activity by calling loadfragment.
This logic can be applied to as many fragments as is necessary.
I'm trying to use the searchView widget in a fragment. I can't find a way to do it. It's easier to implement a searchView using an Activity but I have no clue how to do implement it in a fragment in Kotlin. I tried this way but doesn't seem to work ( only works in an activity). I'm a beginner in Android and would really appreciate some help here, i've been struggling for a couple of days rn.
class Homepage : Fragment() {
private var layoutManager : RecyclerView.LayoutManager? = null
private var _binding : FragmentHomepageBinding? = null
private val binding get() = _binding!!
private val shoe = DataSource.shoes
val arrayList = ArrayList<Shoe>()
val displayList = ArrayList<Shoe>()
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
}
override fun onCreateView(
inflater: LayoutInflater, container: ViewGroup?,
savedInstanceState: Bundle?
): View? {
// Inflate the layout for this fragment
_binding = FragmentHomepageBinding.inflate(inflater, container, false)
return binding.root
}
override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
super.onViewCreated(view, savedInstanceState)
val myAdapter = ShoeAdapter(displayList)
layoutManager = GridLayoutManager(this.context,2)
recyclerView.layoutManager = layoutManager
recyclerView.adapter = myAdapter
setHasOptionsMenu(true)
}
override fun onCreateOptionsMenu(menu: Menu, inflater: MenuInflater) {
inflater.inflate(R.menu.main_menu,menu)
val menuItem = menu.findItem(R.id.search)
val searchView = menuItem.actionView as SearchView
searchView.setOnQueryTextListener(object : SearchView.OnQueryTextListener{
override fun onQueryTextSubmit(query: String?): Boolean {
return true
}
override fun onQueryTextChange(newText: String?): Boolean {
if(newText!!.isNotEmpty()){
displayList.clear()
val search = newText.lowercase(Locale.getDefault())
arrayList.forEach {
if(it.name.lowercase(Locale.getDefault()).contains(search)){
displayList.add(it)
}
}
recyclerView.adapter!!.notifyDataSetChanged()
}
else{
displayList.clear()
displayList.addAll(arrayList)
recyclerView.adapter!!.notifyDataSetChanged()
}
return true
}
})
super.onCreateOptionsMenu(menu, inflater)
}
override fun onOptionsItemSelected(item: MenuItem): Boolean {
return super.onOptionsItemSelected(item)
}
}```
I used it as below before and it was working properly.
class BooksFragment : Fragment(), SearchView.OnQueryTextListener {
private lateinit var binding: FragmentBooksBinding
override fun onCreateView(
inflater: LayoutInflater, container: ViewGroup?,
savedInstanceState: Bundle?
): View {
binding = FragmentBooksBinding.inflate(inflater, container, false)
binding = DataBindingUtil.inflate(inflater, R.layout.fragment_books, container, false)
return binding.root
}
override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
super.onViewCreated(view, savedInstanceState)
setHasOptionsMenu(true)
}
override fun onCreateOptionsMenu(menu: Menu, inflater: MenuInflater) {
inflater.inflate(R.menu.toolbar_menu,menu)
val item = menu.findItem(R.id.search_book)
val searchView = item.actionView as SearchView
searchView.setOnQueryTextListener(this)
super.onCreateOptionsMenu(menu, inflater)
}
override fun onQueryTextSubmit(query: String): Boolean {
// search button submit
return true
}
override fun onQueryTextChange(newText: String): Boolean {
// search text changed
return true
}
How do I add an actionbar menu in my fragments using Kotlin? When I run the code below nothing shows up.
class Fragment1: Fragment() {
private lateinit var fview: View
override fun onCreateView(
inflater: LayoutInflater,container: ViewGroup?,
savedInstanceState: Bundle?
): View?{
// Inflate the layout for this fragment
dissview = inflater.inflate(R.layout.fragment_dissability, container, false)
setHasOptionsMenu(true)
return fview
}//end on create
override fun onCreateOptionsMenu(menu: Menu, inflater: MenuInflater) {
inflater.inflate(R.menu.mainmenu, menu);
super.onCreateOptionsMenu(menu, inflater)
}
I am working kotlin. I have a fragment on my Activity . l want when click on button inside of fragment activity go to another activity .
this code my used in fragment class
class fragment_Arr :Fragment(), View.OnClickListener {
override fun onClick(v: View?) {
val intent = Intent(activity, FlightDeatilasDep::class.java)
startActivity(intent)
}
override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
return inflater.inflate(R.layout.fragment_arrivel,container,false)
loadmorefilghtsbeforday.setOnClickListener{this}
}
}
when l debug app and click on button no event happening !
loadmorefilghtsbeforday.setOnClickListener{} body of the lambda is empty - nothing happen.
Please register your listener by
override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
val view = inflater.inflate(R.layout.fragment_arrivel,container,false)
loadmorefilghtsbeforday.setOnClickListener(this)
return view
}
or if you prefer using lambdas
loadmorefilghtsbeforday.setOnClickListener{ onClick(null) } could be called but then your fragment don't need to implements View.OnClickListener.
and class names in Kotlin/java should start from capital later: FragmentArr.
_ is not recommended