My project has a class called Welcome.kt
class Welcome : AppCompatActivity() {
private lateinit var vb: ActivityWelcomesBinding
fun runDemo(v: View) {
}
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
vb = ActivityRegisterBinding.inflate(layoutInflater)
setContentView(vb.root)
}
}
In the layout of this class (Welcome.kt) I have the usual views and also an included layout
<?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">
<ScrollView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#color/background"
tools:context=".Welcome">
<FrameLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
...
...
<include layout="#layout/layout_buttons" />
...
...
</FrameLayout>
</ScrollView>
</FrameLayout>
And this is the included layout (layout_buttons), a series of buttons that have the onClick attribute, which should execute the "startDemo" function that is in the activity Welcome.kt
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal">
...
...
<Button
android:id="#+id/btn_1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginEnd="10dp"
android:onClick="runDemo"
android:text="#string/text1" />
<Button
android:id="#+id/btn_2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginEnd="10dp"
android:onClick="runDemo"
android:text="#string/text2" />
<Button
android:id="#+id/btn_3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginEnd="10dp"
android:onClick="runDemo"
android:text="#string/text3" />
</LinearLayout>
Since the buttons are inside an included layout, I can't find a way to get them to call the "runDemo" function of the Welcome.kt activity.
I have searched for information but nothing I have found has solved my problem.
Thanks in advance
you should give your include tag an id for example
<include id="#+id/buttonsLayout"
layout="#layout/layout_buttons" />
After this you can use it like this :
class Welcome : AppCompatActivity() {
private lateinit var vb: ActivityWelcomesBinding
fun runDemo(v: View) {
}
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
vb = ActivityRegisterBinding.inflate(layoutInflater)
setContentView(vb.root)
vb.buttonsLayout.yourBtnId
}
}
if you want still to use onClick in the xml then you should use data binding not view binding
Related
I am trying to add drawerlayout in my fragment home. I am getting java.lang.IllegalArgumentException: DrawerLayout must be measured with MeasureSpec.EXACTLY. this error when I tried to attach drawer layout to my fragment.
I have root layout as constraint layout. Firstly I tried with root layout as drawerlayout still I wast getting this exception so I tried adding constraint layout to it but did not work.
It works when I give the hard coded value to height and width as 500dp.
But hard coded value cant be given as it will not be good practice for all devices size it will differ.
Below is my code
drawer layout
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
xmlns:app="http://schemas.android.com/apk/res-auto"
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">
<androidx.drawerlayout.widget.DrawerLayout
android:id="#+id/drawer"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintTop_toTopOf="parent"
android:layout_width="match_parent"
android:layout_height="0dp"
android:fitsSystemWindows="true"
tools:openDrawer="start">
<include
layout="#layout/fragment_home"
android:visibility="visible" />
<com.google.android.material.navigation.NavigationView
android:id="#+id/nav_view"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
android:layout_gravity="start">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<include
android:id="#+id/nav_header"
layout="#layout/nav_header" />
<ScrollView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fadeScrollbars="true"
android:scrollbars="none">
<include
android:id="#+id/menuItems"
layout="#layout/layout_navigation_menu" />
</ScrollView>
</LinearLayout>
</com.google.android.material.navigation.NavigationView>
</androidx.drawerlayout.widget.DrawerLayout>
</androidx.constraintlayout.widget.ConstraintLayout>
Home fragment layout
<?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">
<ScrollView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:fillViewport="true"
android:fitsSystemWindows="true">
<androidx.constraintlayout.widget.ConstraintLayout
android:id="#+id/root"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<include android:id="#+id/app_bar"
layout="#layout/app_bar_main"/>
<RelativeLayout
android:id="#+id/relative_accept"
android:layout_width="match_parent"
android:layout_height="#dimen/margin_55"
android:orientation="horizontal"
android:background="#color/green_500"
app:layout_constraintTop_toBottomOf="#id/app_bar">
<androidx.appcompat.widget.AppCompatTextView
android:layout_width="wrap_content"
android:layout_alignParentStart="true"
android:layout_centerVertical="true"
android:textColor="#color/white"
android:layout_marginLeft="#dimen/margin_16"
android:layout_marginStart="#dimen/margin_16"
android:layout_marginRight="#dimen/margin_16"
android:layout_marginEnd="#dimen/margin_16"
android:text="#string/accepting_orders"
android:fontFamily="#font/roboto_regular"
android:textSize="#dimen/text_size_15"
android:layout_alignParentLeft="true"
android:layout_height="wrap_content" />
<Switch
android:id="#+id/switch1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:track="#drawable/switch_track_selector"
android:layout_centerVertical="true"
android:layout_alignParentEnd="true"
android:layout_alignParentRight="true"
tools:ignore="UseSwitchCompatOrMaterialXml" />
</RelativeLayout>
<FrameLayout
android:id="#+id/frameLayout_tab"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:clipToPadding="false"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/relative_accept">
<com.google.android.material.tabs.TabLayout
android:id="#+id/tabs"
android:layout_width="match_parent"
android:layout_height="42dp"
android:layout_marginStart="#dimen/margin_16"
android:layout_marginLeft="#dimen/margin_16"
android:layout_marginTop="#dimen/margin_20"
android:layout_marginEnd="#dimen/margin_16"
android:layout_marginRight="#dimen/margin_16"
android:background="#drawable/grey_drawable"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:tabGravity="fill"
app:tabIndicatorHeight="0dp"
app:tabMode="fixed"
android:onClick="#{(v)->click.onClick(v)}"
app:tabBackground="#drawable/tab_selector"
app:tabSelectedTextColor="#color/white" />
</FrameLayout>
<androidx.viewpager.widget.ViewPager
android:id="#+id/view_pager"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_constraintTop_toBottomOf="#+id/frameLayout_tab" />
</androidx.constraintlayout.widget.ConstraintLayout>
</ScrollView>
</androidx.constraintlayout.widget.ConstraintLayout>
Home fragment
class HomeFragment : BaseFragment() , View.OnClickListener{
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
}
override fun onCreateView(
inflater: LayoutInflater, container: ViewGroup?,
savedInstanceState: Bundle?
): View? = inflater.inflate(R.layout.drawer_layout_navigation_view, container, false)
override fun onActivityCreated(savedInstanceState: Bundle?) {
super.onActivityCreated(savedInstanceState)
init()
controlInit()
}
override fun init() {
val toggle = ActionBarDrawerToggle(
(activity as MainActivity),
drawer,
R.string.navigation_drawer_open,
R.string.navigation_drawer_close
)
drawer.addDrawerListener(toggle)
tabs.setupWithViewPager(view_pager)
bindViewPagerAdapter(view_pager, (activity as MainActivity))
bindViewPagerTabs(tabs, view_pager)
tabSettings()
}
private fun tabSettings() {
tabs.bringToFront()
view_pager.addOnPageChangeListener(object : ViewPager.OnPageChangeListener {
override fun onPageScrolled(
position: Int, positionOffset: Float, positionOffsetP: Int
) {
}
override fun onPageSelected(position: Int) {}
override fun onPageScrollStateChanged(i: Int) {}
})
}
private fun bindViewPagerAdapter(view: ViewPager?, mainActivity: MainActivity) {
val adapter = OrdersAdapter(view?.context!!, childFragmentManager)
view.adapter = adapter
}
private fun bindViewPagerTabs(view: TabLayout, pagerView: ViewPager?) {
view.setupWithViewPager(pagerView, true)
}
private fun controlInit() {
imageView_drawer.setOnClickListener(this)
}
#SuppressLint("WrongConstant")
override fun onClick(p0: View) {
when (p0.id) {
R.id.imageView_drawer -> {
drawer.openDrawer(Gravity.START)
}
}
}
companion object {
#JvmStatic
fun newInstance() =
HomeFragment().apply {}
}
}
Please help with this.Thank you....
Your layout actually worked just fine when I tested it so I am not sure if the issue lies with the layout. However your layout files are overly complex, you don't really need any of the nested layouts that you have and can achieve the same results without. ConstraintLayout was developed with the purpose of simplifying layout hierarchies so you should be able to just use that to organise your child views.
Also the NavigationView component is meant to be used to display a menu from a menu resource, not just to be used as a wrapper for your own. Either choose to display your own menu completely or use their implementation as intended. There is some nice documentation for this on the [Material Design website] here.
So may I suggest you try to cut down on nesting your layouts and then see whether this incidentally fixes your problem.
The hierarchy that you might want would probably look something like this:
drawer_layout.xml
<DrawerLayout>
<include layout="#layout/home" />
<NavigationView />
</DrawerLayout>
home.xml
<ScrollView>
<ConstraintLayout>
<include layout="#layout/app_bar_main"/>
<TextView />
<Switch />
<TabLayout />
<ViewPager />
</ConstraintLayout>
</ScrollView>
I have a matter with my android studio project. In this project, I was using data binding.
it all works fine. But, when I create a new kotlin class the problem occurs. My Activity.kt cannot recognize my id in XML layout.
activity_chapter.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
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:orientation="vertical"
android:background="#android:color/white"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".ChapterActivity">
<androidx.appcompat.widget.Toolbar
android:id="#+id/toolbar"
android:minHeight="?attr/actionBarSize"
app:titleTextColor="#color/textColor"
android:background="#color/columnColor"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
<LinearLayout
android:orientation="horizontal"
android:padding="16dp"
android:weightSum="4"
android:background="#color/black"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<TextView
android:id="#+id/txt_comic"
android:text="Chapter (10)"
android:textColor="#color/textColor"
android:textSize="20sp"
android:textStyle="bold"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
</LinearLayout>
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/recycler_chapter"
android:padding="8dp"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
</LinearLayout>
ChapterActivity.kt
package com.tutorial.kotlinfirebasecomicreader
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import androidx.databinding.DataBindingUtil
import com.tutorial.kotlinfirebasecomicreader.databinding.ActivityMainBinding
class ChapterActivity : AppCompatActivity() {
private lateinit var binding: ActivityMainBinding
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
binding = DataBindingUtil.setContentView(this, R.layout.activity_chapter)
binding.toolbar
}
}
Issue is
private lateinit var binding: ActivityMainBinding
Use
private lateinit var binding: ActivityChapterBinding
In this code, I used findViewById.
logcat says java.lang.NullPointerException: findViewById(R.id.bottom_navigation) must not be null
So, when I looked up, it is recommended to use it as a viewbinding in kotlin 1.4.
How to apply it?
or how to fix this code using findViewById ?
[https://developer.android.com/topic/libraries/view-binding][1]
->MainActivity
Class MainActivity : AppCompatActivity() , BottomNavigationView.OnNavigationItemSelectedListener{
private lateinit var bottom_navigation : BottomNavigationView
override fun onNavigationItemSelected(item: MenuItem): Boolean {
when(item.itemId){
...
}
}
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
bottom_navigation= findViewById(R.id.bottom_navigation)
setContentView(R.layout.activity_main)
bottom_navigation.setOnNavigationItemSelectedListener(this)
}
}
-> activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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=".MainActivity">
<Toolbar
android:id="#+id/my_toolbar"
android:layout_width="match_parent"
android:layout_height="35dp">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<ImageView
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:src="#drawable/logo_title"/>
</RelativeLayout>
</Toolbar>
<LinearLayout
android:id="#+id/toolbar_division"
android:background="#color/colorDivision"
android:orientation="horizontal"
android:layout_below="#id/my_toolbar"
android:layout_width="match_parent"
android:layout_height="1dp"></LinearLayout>
<FrameLayout
android:id="#+id/main_content"
android:layout_below="#id/toolbar_division"
android:layout_above="#id/nav_division"
android:layout_width="match_parent"
android:layout_height="match_parent"></FrameLayout>
<LinearLayout
android:id="#+id/nav_division"
android:background="#color/colorDivision"
android:orientation="horizontal"
android:layout_above="#+id/bottom_navigation"
android:layout_below="#id/my_toolbar"
android:layout_width="match_parent"
android:layout_height="1dp"></LinearLayout>
<com.google.android.material.bottomnavigation.BottomNavigationView
android:id="#+id/bottom_navigation"
android:layout_alignParentBottom="true"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:menu="#menu/bottom_navigation_main">
</com.google.android.material.bottomnavigation.BottomNavigationView>
just call setContentView before calling findViewById
setContentView(R.layout.activity_main)
bottom_navigation = findViewById(R.id.bottom_navigation)
like this
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
val binding = ActivityMainBinding.inflate(layoutInflater)
binding.bottomNavigation.setOnNavigationItemSelectedListener(this)
setContentView(binding.root)
}
Is it possible to show the word inserted in a password field by clicking on a button and then when I click it again hide the password as dots?
I'll really appreciate your help.
Try this code:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<LinearLayout
android:orientation="horizontal"
android:gravity="center"
android:layout_marginTop="100sp"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<EditText
android:id="#+id/pwd"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:minWidth="200sp"
android:hint="Password"
android:inputType="textPassword" />
<Button
android:id="#+id/showHideBtn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Show"/>
</LinearLayout>
</LinearLayout>
class MainActivity : AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
showHideBtn.setOnClickListener {
if(showHideBtn.text.toString().equals("Show")){
pwd.transformationMethod = HideReturnsTransformationMethod.getInstance()
showHideBtn.text = "Hide"
} else{
pwd.transformationMethod = PasswordTransformationMethod.getInstance()
showHideBtn.text = "Show"
}
}
}
}
I am currently learning about the Conductor framework for Android and have a bit of a problem or misunderstanding of how it works.
I was under the impression that the method
setRetainViewMode(RetainViewMode.RETAIN_DETACH);
would save the states of the views in the controller. To test the behaviour, I added EditText views, entered a value in it and rotated the screen. I also added 2 views with onclick listeners attached, changing the background color onclick
The result of the test was that the EditText views maintained the state and preserved the entered values. But the 2 views, changed back to their original background color (none).
This is the behaviour of the views regardless on which RetainViewMode is set
I have this simple MainActivity (note: I'm writing in Kotlin):
class MainActivity : AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
var router: Router = Conductor.attachRouter(this, controller_container, savedInstanceState)
if (!router.hasRootController()) {
var t : TestController = TestController()
t.retainViewMode = Controller.RetainViewMode.RETAIN_DETACH
router.setRoot(RouterTransaction.with(t))
}
}
companion object doTask {
fun start(activity : Activity) {
val intent = Intent(activity, MainActivity::class.java)
activity.startActivity(intent)
}
}
}
And here is the the TestController:
class TestController : BaseController() {
var i : Int = 0
var h : Int = 0
override fun onViewBound(view: View) {
view.a.setOnClickListener {
i++
if (i % 2 == 0) {
view.a.setBackgroundColor(ContextCompat.getColor(applicationContext, R.color.white))
} else {
view.a.setBackgroundColor(ContextCompat.getColor(applicationContext, R.color.turtle_green))
}
}
view.b.setOnClickListener {
h++
if (h % 2 == 0) {
view.b.setBackgroundColor(ContextCompat.getColor(applicationContext, R.color.white))
} else {
view.b.setBackgroundColor(ContextCompat.getColor(applicationContext, R.color.blue_light))
}
}
}
override fun inflateView(inflater: LayoutInflater, container: ViewGroup): View {
return inflater.inflate(R.layout.controller_layout_test, container, false)
}
}
And xml layout file controller_layout_test:
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<requestFocus></requestFocus>
<ImageView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:src="#drawable/logo_simple"/>
<ScrollView
android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout
android:layout_width="300dp"
android:layout_height="wrap_content"
android:orientation="vertical"
android:layout_margin="30dp"
android:layout_gravity="center"
android:background="#color/transparent50p"
android:padding="20dp">
<EditText
android:id="#+id/gt"
android:layout_width="match_parent"
android:layout_height="40dp"
android:layout_gravity="center"
android:layout_marginTop="10dp"
android:padding="6dp"
android:background="#color/white_transparent50p"/>
/>
<EditText
android:id="#+id/erergeargf"
android:layout_width="match_parent"
android:layout_height="40dp"
android:layout_gravity="center"
android:layout_marginTop="10dp"
android:padding="6dp"
android:background="#color/white_transparent50p"/>
<View
android:id="#+id/a"
android:layout_width="50dp"
android:layout_height="50dp"
android:layout_margin="5dp"
android:layout_gravity="center"></View>
<View
android:id="#+id/b"
android:layout_width="50dp"
android:layout_height="50dp"
android:layout_margin="5dp"
android:layout_gravity="center"></View>
</LinearLayout>
</ScrollView>
</FrameLayout>
activity_main xml layout looks like this:
<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout
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"
android:fitsSystemWindows="true"
tools:context="dk.minreklame.minetilbud_v2.MainActivity">
<android.support.design.widget.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:theme="#style/ThemeOverlay.AppCompat.Dark.ActionBar"
/>
</android.support.design.widget.AppBarLayout>
<com.bluelinelabs.conductor.ChangeHandlerFrameLayout
android:id="#+id/controller_container"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="#string/appbar_scrolling_view_behavior"
/>
</android.support.design.widget.CoordinatorLayout>
As your views have references to the host Activity, they will never be retained across orientation changes. That would cause a memory leak. The docs on RETAIN_DETACH state:
The Controller will retain its reference to its view when detached, but will still release the reference when a config change occurs.