So I was trying animation on Android using View Binding and it was not working, I tried the old way of getting views (findViewById()) and it happened to work just fine. Any answer to why View Binding doesn't work with animations? Thanks in advance for any answer.
Here the example code:
activity_main.xml
<?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"
android:background="#drawable/sopint_background"
tools:context=".MainActivity">
<TextView
android:id="#+id/tvLogo"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="#drawable/rectangle_bordered"
android:fontFamily="#font/aldrich"
android:lineSpacingExtra="12sp"
android:padding="20dp"
android:text="I am a text"
android:textAlignment="center"
android:textColor="#FFFFFF"
android:textSize="24sp"
android:textStyle="bold"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>
logo_animation.xml
<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android">
<translate
android:duration="2000"
android:fromXDelta="0%"
android:fromYDelta="-50%" />
<alpha
android:duration="1500"
android:fromAlpha="0.1"
android:toAlpha="1.0" />
</set>
and MainActivity.kt
class MainActivity : AppCompatActivity() {
//Binding
lateinit var binding: ActivityMainBinding
//Variables
lateinit var topAnimation: Animation
lateinit var logo: TextView
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
binding = ActivityMainBinding.inflate(layoutInflater)
setContentView(binding.root)
setContentView(R.layout.activity_main)
logo = findViewById(R.id.tvLogo)
topAnimation = AnimationUtils.loadAnimation(applicationContext, R.anim.logo_animation)
logo.startAnimation(topAnimation)
//This does not work
//binding.tvLogo.startAnimation((topAnimation))
}
}
binding = ActivityMainBinding.inflate(layoutInflater)
setContentView(binding.root)
setContentView(R.layout.activity_main)
What you're doing here is
inflating a layout, storing it in binding
displaying that inflated layout
replacing that and displaying another inflated copy of the layout
binding.tvLogo.startAnimation((topAnimation))
This doesn't work because you can't see it happening - you're animating the View on the first layout you inflated, but it's the second one that's being displayed, and you're not interacting with that.
logo = findViewById(R.id.tvLogo)
logo.startAnimation(topAnimation)
Whereas this one works because you're looking up tvLogo on the currently displayed layout (the second one) and then animating that View. Because it's the one on the screen, you see the results
Basically, if you ever find yourself inflating a layout more than once, that's a sign you're doing something wrong (there can be situations where you would, but in that case you'd know why you're doing it!). And the same goes for multiple setContentView calls
Related
I want to leverage ViewStub to optionally show a portion of UI. When the root of my inflated item is ConstraintLayout then it doesn't render.
But if that root is MaterialCardView then it displays as intended.
<!-- my_fragment.xml -->
<?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"
android:id="#+id/fragmentRootLayout"
android:layout_width="match_parent"
android:layout_height="match_parent">
<ViewStub
android:id="#+id/fragmentViewStub"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:inflatedId="#+id/fragmentViewStub"
android:layout="#layout/item"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>
<!-- item.xml -->
<?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"
android:id="#+id/itemRootLayout"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<com.google.android.material.textview.MaterialTextView
android:id="#+id/itemLabel"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="#string/itemLabelText"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>
/* MyFragment.kt */
#AndroidEntryPoint
class MyFragment : Fragment(R.layout.my_fragment) {
private val viewModel: MyViewModel by viewModels()
private val viewBinding: MyFragmentBinding by viewLifecycleLazy {
MyFragmentBinding.bind(requireView())
}
override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
super.onViewCreated(view, savedInstanceState)
viewBinding.fragmentViewStub.inflate()
}
}
I've tried matching the ViewStub's id/inflatedId attributes and programmatically setting dimensions/constraints but neither solved the issue.
What am I overlooking about making these pieces work together?
Forgot to update with my answer/oversight. This worked as expected in both cases all along.
Nightmode was enabled and the behavior of MaterialCardView has automatic contrast between its card and content. Meanwhile, when ConstraintLayout inverts its theme the label appears to be missing but is indeed present, as white text on white background.
I have surprisingly been stuck on this one for a little while.
User Story:
The user should see a Loading Dialog that can be reused through the application with a transparent background so you only see the progress spinner and the text under the progress spinner.
Currently, I have a DialogFragment that inflates this XML to present itself:
<?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="wrap_content"
android:background="#android:color/transparent">
<ProgressBar
android:id="#+id/progressBar"
style="?android:attr/progressBarStyle"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:alpha="1"
android:background="#android:color/transparent"
android:indeterminateDrawable="#drawable/loading_spinner"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.498"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.499" />
<TextView
android:id="#+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="8dp"
android:alpha="1"
android:background="#android:color/transparent"
android:text="Loading..."
android:textColor="#FFFFFF"
android:textSize="16sp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/progressBar" />
</androidx.constraintlayout.widget.ConstraintLayout>
I am trying to set the transparency in the background and have had these results:
alpha set changes children elements to transparent as well
above XML setting does nothing and shows a white background
Setting it programmatically(See below) also does nothing and displays it white.
LoadingDialog():
class LoadingDialog(): DialogFragment() {
private var _binding: FragmentLoadingDialogBinding? = null
private val binding get() = _binding!!
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
this.dialog?.window?.setBackgroundDrawableResource(android.R.color.transparent)
}
override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState:Bundle?
): View? {
_binding = FragmentLoadingDialogBinding.inflate(inflater, container, false)
return binding.root
}
//Always do this in Dialog to maintain memory management
override fun onDestroy() {
super.onDestroy()
_binding = null
}
}
How can I get the above LoadingDialog to present the Loading Progress Spinner and the Text without the white background?
I think you should call onCreate() method before setting the background to transparent after which you should set the view for your dialog. Try this
val dialogBinding = // inflate dialog here using dataBinding for example
val customDialog = AlertDialog.Builder(this, 0).create() // works with other dialogs as well
customDialog.apply {
window?.setBackgroundDrawable(ColorDrawable(Color.TRANSPARENT))
setView(dialogBinding?.root)
}.show()
I hope this helps you solve your problem. For more information about Dialogs in Android, please refer to my article on section.io
something else, consider removing the transparent background on your root viewGroup as shown below
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
...
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#android:color/transparent">
edit to
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
...
android:layout_width="match_parent"
android:layout_height="wrap_content">
I don't know if it is a bug or i am making some mistake but when i set Explode animation when opening an Activity it animates like a Slide animation from top to bottom. I did some trial and error and it turns out that when i use a custom background color in the root layout in the xml file this unexpected behavior occures. When i remove the background color everything works as expected.
Can anyone tell me what's going on here??? Because it is important for me to set background color in the root layout.
Here's a sample of my xml code:
<?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"
android:background="#000000" // This causes the unexpected behavior.
tools:context=".ExplodeActivity">
<ImageView
android:id="#+id/imageView2"
android:layout_width="200dp"
android:layout_height="200dp"
android:layout_marginTop="100dp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:srcCompat="#drawable/b" />
<Button
android:id="#+id/button2"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:text="Button"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>
This is the ExplodeActivity 's onCreate method where i am assigning the animation:
class ExplodeActivity : AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
window.requestFeature(Window.FEATURE_CONTENT_TRANSITIONS)
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_explode)
val enterTransition = Explode()
enterTransition.duration = 500
window.enterTransition = enterTransition
}
}
Here's the previous activity's code which responsible for starting the ExplodeActivity:
val options = ActivityOptions.makeSceneTransitionAnimation(this).toBundle()
val intent = Intent(this, ExplodeActivity::class.java)
startActivity(intent, options)
I am wondering why adding viewBinding to my app, makes the XML root display in full screen when running the app. The root doesn't display in full screen in the designer view inside Android Studio.
Due to the root displaying in full screen, I had to add android:gravity="center" to vertically align the children in the center. While I don't think this should be a problem, I'm still interested in knowing why this is the case.
I have the following code;
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:gravity="center"
android:layout_gravity="center_vertical"
android:background="#color/colorAccent"
tools:context=".MainActivity">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:text="1"
android:textSize="30sp" />
<Button
android:id="#+id/roll_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:text="#string/roll"/>
</LinearLayout>
package com.example.diceroller
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import com.example.diceroller.databinding.ActivityMainBinding
class MainActivity : AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
val binding = ActivityMainBinding.inflate(layoutInflater)
binding.rollButton.text = "testBind"
setContentView(binding.root)
}
}
I am not sure but I think that when You execute this setContentView(binding.root) You are setting a linear layout as fullscreen.
setContentView Android Docs
Set the activity content to an explicit view. This view is placed directly into the activity's view hierarchy. It can itself be a complex view hierarchy. When calling this method, the layout parameters of the specified view are ignored. Both the width and the height of the view are set by default to ViewGroup.LayoutParams#MATCH_PARENT. To use your own layout parameters, invoke setContentView(android.view.View, android.view.ViewGroup.LayoutParams) instead.
To do make it looks like in the preview You can write this code.
XML:
<?xml version="1.0" encoding="utf-8"?>
<layout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools">
<data>
</data>
<FrameLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center_vertical"
android:background="#color/colorAccent"
android:gravity="center"
android:orientation="vertical"
tools:context=".MainActivity">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:text="1"
android:textSize="30sp" />
<Button
android:id="#+id/roll_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:text="Roll" />
</LinearLayout>
</FrameLayout>
</layout>
MainActivity.kt:
class MainActivity : AppCompatActivity() {
private lateinit var binding: ActivityMainBinding
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
binding = ActivityMainBinding.inflate(layoutInflater)
binding.rollButton.text = "Test Roll"
setContentView(binding.root)
}
}
Tip: To convert fast Your layout to data binding layout use: Alt + Enter ➡ Convert to data binding layout
Actual Code:
My Main Activity:
class MainActivity : AppCompatActivity() {
private lateinit var binding: ActivityMainBinding
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
binding = ActivityMainBinding.inflate(layoutInflater)
val rollButton = binding.rollButton
rollButton.setOnClickListener { rollDice() }
setContentView(binding.root)
}
private fun rollDice() {
val randomDiceRoll = Random.nextInt(6) + 1
Toast.makeText(this, randomDiceRoll.toString(), Toast.LENGTH_SHORT).show()
binding.resultText.text = randomDiceRoll.toString()
}
My XML file:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center_vertical"
android:orientation="vertical"
tools:context=".MainActivity">
<TextView
android:id="#+id/result_text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:text="#string/count"
android:textSize="30sp" />
<Button
android:id="#+id/roll_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:text="#string/roll" />
</LinearLayout>
Preview in android studio:
Actual layout in device:
If I change setContentView(binding.root) to setContentView(R.layout.activity_main), the layout of Android Studio and the device become the same, but of course, the button doesn't work anymore...
Why does this happen? Why is ActivityMainBinding.inflate(layoutInflater) changing the layout? How to fix this?
Thanks
GitHub Repo:
https://github.com/Wizard28082006/Dice_Roller
If I change setContentView(binding.root) to setContentView(R.layout.activity_main), the layout of Android Studio and the device become the same
Most likely caused by how the container is not passed to the inflater if the view is inflated like this.
You could try the following instead:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/root"
And
class MainActivity : AppCompatActivity() {
private lateinit var binding: ActivityMainBinding
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
binding = ActivityMainBinding.bind(findViewById(R.id.root))
val rollButton = binding.rollButton
rollButton.setOnClickListener { rollDice() }
Maybe you should set android:layout_height as match_parent in your linearlayout and align inner views in it.
Since the screenshots suggest that the question comes from the Udacity course on Andorid, there is a good explanation on the course knowledge hub (link accessible only to the course users). In short, the explanation is the two things mentioned in the setContentView docs and the ViewBinding docs.
First is that when using setContentView the
layout parameters of the specified view are ignored
and the drawback of ViewBinding is
it doesn't support layout variables or layout expressions, so it can't
be used to declare dynamic UI content straight from XML layout files
There is a difference between android:gravity and android:layout_gravity:
android:gravity sets the gravity of the View Content (or child in case it was applied on a ViewGroup).
meanwhile android:layout_gravity sets the gravity of the View it is applied on, relative to its parent.
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:gravity="center_vertical"
tools:context=".MainActivity">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="1"
android:layout_gravity="center_horizontal"
android:textSize="30sp"/>
</LinearLayout>
Adding android:gravity = "center" to LinearLayout solves the problem.