i manually created a fragment. but cant declare a component like web view or button. when i paste and edit "val webview: WebView ..." there is error "Fragment(R.layout.fragment_htmlviewer)" too. i dont know how to do, when i create from android studio, it looks like very complicated. so i watched a video and this is more easy but cant declare components. im very beginner so help me please... my code:
fragment_htmlviewer.xml
<WebView
android:id="#+id/htmlViewer"
android:layout_width="0dp"
android:layout_height="0dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="1.0"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<com.google.android.material.floatingactionbutton.FloatingActionButton
android:id="#+id/floating_action_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="bottom|end"
android:layout_margin="16dp"
android:contentDescription="#string/fabdescription"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:srcCompat="#drawable/ic_left_arrow_icon" />
HtmlViewerFragment.kt
class HtmlViewerFragment : Fragment(R.layout.fragment_htmlviewer) {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
}
override fun onCreateView(
inflater: LayoutInflater,
container: ViewGroup?,
savedInstanceState: Bundle?
): View? {
return super.onCreateView(inflater, container, savedInstanceState)
}
override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
super.onViewCreated(view, savedInstanceState)
val webview: WebView = getView()!!.findViewById<View>(R.id.htmlViewer) as WebView
}
}
I recommend you to use the binding structure, it is a more preferred structure today.
build.gradle(module)
buildFeatures {
viewBinding true
dataBinding true
}
HtmlViewerFragment
private var _binding: FragmentHtmlViewerBinding? = null
private val binding
get() = _binding!!
override fun onCreateView(
inflater: LayoutInflater,
container: ViewGroup?,
savedInstanceState: Bundle?
): View? {
_binding = FragmentHtmlViewerBinding.inflate(inflater, container, false)
//.. this is write code
binding.apply{
//eg:
htmlViewer.setOnClickListener{
}
}
return binding.root
}
override fun onStart() {
super.onStart()
htmlViewer = requireView().findViewById(R.id.htmlViewer) as WebView
htmlViewer!!.loadUrl("https://www.google.com")
}
this is solution.
htmlViewer = requireView().findViewById(R.id.htmlViewer) as WebView
fixed
Related
I have a custom ConstraintLayout Myword. when I set the visibility of myword1 to GONE inside kotlin fun doOnLayout, it becomes invisible but myword2 doesn't move down.
But if I set its visibility to GONE in XML or outside doOnLayout, it works as intended.
<learnprogramming.academy.relaf.Myword
android:id="#+id/myword1"
android:layout_width="0dp"
android:layout_height="wrap_content"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent" />
<learnprogramming.academy.relaf.Myword
android:id="#+id/myword2"
android:layout_width="0dp"
android:layout_height="wrap_content"
app:layout_constraintBottom_toTopOf="#id/myword1"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent" />
Source code:
lateinit var bannerword : MutableList<Myword>
lateinit var swippon : ConstraintLayout
fun updatewords{
swippon.doOnLayout {
if (swippon.height>1000) bannerword[0].visibility = View.GONE}
class PhrasesFragment: Fragment() {
companion object {
fun newInstance(): PhrasesFragment {
return PhrasesFragment()
}
}
override fun onCreateView(inflater: LayoutInflater,
container: ViewGroup?,
savedInstanceState: Bundle?): View? {
return inflater.inflate(R.layout.inglesa_screen, container, false) }
override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
super.onViewCreated(view, savedInstanceState)
bannerword=mutableListOf(myword1,myword2)
swippon=parent
updatewords()
}
}
doOnLayout function when layout is laid out calculates parent Layout height and eventually removes myword1. I actually solved changing doOnLayout with Handler(Looper.getMainLooper()).post{} but is wrong with doOnLayout? How should i have used it in the correct way?
I'm trying to use Data binding to run a function when an onClick event occurs, I'm hoping someone can tell me what I'm doing wrong here.
The log item in myClick doesn't run.
XML
<layout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools">
<data>
<variable
name="myBinding"
type="com.example.deletebindingtest.MyFragment" />
</data>
<androidx.appcompat.widget.LinearLayoutCompat
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MyFragment"
android:orientation="vertical">
<Button
android:id="#+id/my_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/button"
android:onClick="#{(view) -> myBinding.myClick()}"/>
</androidx.appcompat.widget.LinearLayoutCompat>
</layout>
My Fragment
class MyFragment : Fragment() {
private lateinit var binding: FragmentMyBinding
override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
// Inflate view and obtain an instance of the binding class
binding = DataBindingUtil.inflate(
inflater,
R.layout.fragment_my,
container,
false
)
binding.lifecycleOwner = viewLifecycleOwner
return binding.root
}
fun myClick() {
Log.i("TEST", "Its working")
}
}
When I click on the extension in the XML it takes me to myClick function.
a Quick fix is on onCreateView add binding.myBinding=this
override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
// Inflate view and obtain an instance of the binding class
binding = DataBindingUtil.inflate(
inflater,
R.layout.fragment_my,
container,
false
)
binding.lifecycleOwner = viewLifecycleOwner
binding.myBinding=this // here
return binding.root
}
also I prefer listener binding you can check it here
Why do buttons in Fragments to not get triggered? I've already spent about 5 hours on this, but no onClick / onFocusListener will trigger
Edit: Code
So this Fragment(s) is on a ViewPager2 on my MainActivity and
it just wont trigger any Callback Methods. I have also tried to but those onClick initializations everywhere
Fragment:
class SearchFragment : Fragment() {
private lateinit var searchBinding: FragmentSearchBinding
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
searchBinding = FragmentSearchBinding.inflate(layoutInflater)
interface OnSearch {
fun onArticleSelected(position: Int)
}
}
override fun onCreateView(
inflater: LayoutInflater, container: ViewGroup?,
savedInstanceState: Bundle?
): View? {
// Inflate the layout for this fragment
return inflater.inflate(R.layout.fragment_search, container, false)
}
override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
super.onViewCreated(view, savedInstanceState)
var test = activity?.findViewById<TabLayout>(R.id.tab_layout)
searchBinding.searchBar.setOnFocusChangeListener{view, hasFocus ->
if (hasFocus){
if (test != null) {
test.isVisible = false
}
Log.d("SearchFragment", "onFocus")
}else{
if (test != null) {
test.isVisible = true
}
}
}
}
}
XML:
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".ui.main.search.SearchFragment"
android:orientation="vertical">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<com.google.android.material.button.MaterialButton
android:id="#+id/testButton"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
<EditText
android:id="#+id/search_bar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textSize="20sp"
android:hint="Search"
android:focusedByDefault="true"/>
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/searchRecyclerView"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
</LinearLayout>
</FrameLayout>
Try something like this
override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?) {
super.onCreateView(view, savedInstanceState)
val binding = FragmentSearchBinding.inflate(inflater, container, false);
val view = binding.root
// Set binding
return view;
}
override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
super.onViewCreated(view, savedInstanceState)
view.findViewById(R.id.searchBar).setOnFocusChangeListener { view, hasFocus ->
}
}
After rotation, one old page is displayed, followed by new pages.
Before rotation 1.
After rotation 2.
Layout with ViewPager:
<RelativeLayout ...
<androidx.viewpager.widget.ViewPager
android:id="#+id/pager"
android:overScrollMode="never"
android:layout_marginStart="16dp"
android:layout_marginTop="20dp"
android:layout_marginEnd="16dp"
android:layout_marginBottom="10dp"
android:layout_height="match_parent"
android:layout_width="match_parent">
</RelativeLayout>
Fragment with this layout:
override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View {
val view = inflater.inflate(layoutId(), container, false)
view.findViewById<ViewPager>(R.id.pager).adapter = TextPagerAdapter(activity!!.supportFragmentManager, listOf())
return view
}
TextPagerAdapter:
override fun getItem(position: Int): Fragment = PageFragment.newInstance("sssssss ssss $position")
override fun getCount() = 5//pageText.size
}
PageFragment:
override fun onCreateView(inflater: LayoutInflater,container: ViewGroup?,savedInstanceState: Bundle?): View? {
val view = inflater.inflate(layoutId(), container, false)
view.findViewById<TextView>(R.id.page_content_textView).text = arguments!!.getCharSequence(PAGE_TEXT)
return view
}
I forgot to check if the content fragment is already created.
The solution is to check if the savedInstanceState == null. And create new fragment if that condition is true.
In MyActivity:
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
if(savedInstanceState == null) this.supportFragmentManager.beginTransaction()
.add(containerViewId, CollectionDemoFragment()).commit()
}
I'm trying to access a WebView from a Fragment and kotlin keeps on saying:
kotlin.TypeCastException: null cannot be cast to non-null type android.webkit.WebView
I have tried to make it null as default then init it but that does not work either. Any suggestions on how I can make it work?
My code:
private lateinit var webView: WebView
override fun onCreateView(inflater: LayoutInflater?, container: ViewGroup?, savedInstanceState: Bundle?): View? {
val view = inflater!!.inflate(R.layout.editor_edit_fragment, container, false)
webView = view.findViewById(R.id.webview) as WebView
resumeWebView()
return view
}
xml:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:android="http://schemas.android.com/apk/res/android">
<WebView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/webview" />
</LinearLayout>
You need to run onCreateView first, then onViewCreated to set up WebView.
class FragmentWebview : Fragment() {
lateinit var contentView: View
override fun onCreateView(
inflater: LayoutInflater, container: ViewGroup?,
savedInstanceState: Bundle?
): View? {
contentView = inflater.inflate(R.layout.fragment_fragment_webview, container, false)
return contentView
}
override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
super.onViewCreated(view, savedInstanceState)
val webview = contentView.findViewById<WebView>(R.id.myWebview)
val url = "http://google.com"
val webSettings = myWebview.settings
webSettings.javaScriptEnabled = true
webSettings.domStorageEnabled = true
webview.webViewClient = WebViewClient()
webview.loadUrl(url)
}
}