Develop Reference

Activity Layout goes blank when switched to Material Design components

Problem :
There was no problem when app was using
Theme.MaterialComponents.Light.NoActionBar
But was not using any MDC elements in Layout like (TextInputLayout etc).
Then i replaced Editext with TextInputLayout and Button with Material Button.
Now here the problem comes.
When i run my app, i see the screen goes blank. Just pure white.
I checked Layout isses.
I found there're 7 warnings and 2 errors(Render problem).
The Render problems are as -
Path.op() not supported. (As was it suggests i refreshed the layout many times. Doesn't work)
java.awt.geom.IllegalPathStateException: missing initial move to in path definition
This is what i have tried -
Downgrading my MDC dependency (how to solve render problem Path.op() not supported?)
Clean project, rebuild and restart Android studio
Please help me to solve this strange issue.
I want to use MDC in my project.
Thank you.

I would suggest you should first make use of the Bridge then, gradually override the parent theme attributes based on your requirement design.
In AndroidManifest.xml
android:theme="#style/MyMaterialTheme"
Then under style.xml. it would like something like
<style name="MyMaterialTheme" parent="Theme.MaterialComponents.Light.NoActionBar.Bridge">
<item name="windowActionBar">false</item>
<item name="windowNoTitle">true</item>
<!-- Customize your theme here. -->
<item name="colorPrimary">#color/colorPrimary</item>
<item name="colorPrimaryDark">#color/colorPrimaryDark</item>
<item name="colorAccent">#color/colorPrimary</item>
<item name="android:windowBackground">#color/white</item>
<item name="toolbarStyle">#style/BlueToolbar</item>
</style>
try referring reference , reference
Simple solution is make your theme extend a Bridge theme :) I hope this helps

How to fix this UI

I am relatively new to Android Studio. I was creating an app which plays music on touch. The app works but I want to remove this element from the UI so that it looks full screen.
This is how it appears in the design window:
This is my styles XML file`
<!-- Base application theme. -->
<style name="AppTheme" parent="Base.Theme.AppCompat.Light.DarkActionBar">
<!-- Customize your theme here. -->
<item name="colorPrimary">#color/colorPrimary</item>
<item name="colorPrimaryDark">#color/colorPrimaryDark</item>
<item name="colorAccent">#color/colorAccent</item>
</style>
This is how the image looks on my phone:
What I want is, I want to see the exact design on the UI design window. Also, I would like my app to look fullscreen, without the name bar.

To remove the "Title Bar" (the Name Bar) you can refer to this question.
I want to see the exact design on the UI design window
There should be error messages telling you why the Layout Designer in Android Studio is not displaying the UI, it could be a library/Gradle issue. or It could be caused by the styles.xml file.

add this to your style
<item name="windowActionBar">false</item>
<item name="windowNoTitle">true</item>
This will hide action bar

Cannot render MaterialButton with android.material:1.1.x

Whenever I use MaterialButton, I get the following exception in the xml preview:
java.lang.IllegalArgumentException: java.lang.ClassCastException
I have upgraded to android studio 3.4 and to com.google.android.material:material:1.1.0-alpha05
Version 1.0.0 works but any 1.1.x doesn't.
Is this a problem with the IDE or the library?
-
For reference, the full stacktrace:
java.lang.ClassCastException#d8dc5d1
at sun.reflect.GeneratedMethodAccessor893.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at android.animation.PropertyValuesHolder_Delegate.callMethod(PropertyValuesHolder_Delegate.java:108)
at android.animation.PropertyValuesHolder_Delegate.nCallFloatMethod(PropertyValuesHolder_Delegate.java:143)
at android.animation.PropertyValuesHolder.nCallFloatMethod(PropertyValuesHolder.java)
at android.animation.PropertyValuesHolder.access$400(PropertyValuesHolder.java:38)
at android.animation.PropertyValuesHolder$FloatPropertyValuesHolder.setAnimatedValue(PropertyValuesHolder.java:1387)
at android.animation.ObjectAnimator.animateValue(ObjectAnimator.java:990)
at android.animation.ValueAnimator.animateBasedOnTime(ValueAnimator.java:1339)
at android.animation.ValueAnimator.doAnimationFrame(ValueAnimator.java:1471)
at android.animation.ValueAnimator.pulseAnimationFrame(ValueAnimator.java:1490)
at android.animation.AnimatorSet.pulseFrame(AnimatorSet.java:1163)
at android.animation.AnimatorSet.handleAnimationEvents(AnimatorSet.java:1146)
at android.animation.AnimatorSet.doAnimationFrame(AnimatorSet.java:1046)
at android.animation.AnimationHandler.doAnimationFrame(AnimationHandler.java:146)
at android.animation.AnimationHandler.access$100(AnimationHandler.java:37)
at android.animation.AnimationHandler$1.doFrame(AnimationHandler.java:54)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:947)
at android.view.Choreographer.doCallbacks(Choreographer.java:761)
at android.view.Choreographer_Delegate.doFrame(Choreographer_Delegate.java:66)
at com.android.layoutlib.bridge.impl.RenderSessionImpl.renderAndBuildResult(RenderSessionImpl.java:563)
at com.android.layoutlib.bridge.impl.RenderSessionImpl.render(RenderSessionImpl.java:425)
at com.android.layoutlib.bridge.BridgeRenderSession.render(BridgeRenderSession.java:120)
at com.android.ide.common.rendering.api.RenderSession.render(RenderSession.java:151)
at com.android.ide.common.rendering.api.RenderSession.render(RenderSession.java:133)
at com.android.tools.idea.rendering.RenderTask.lambda$null$8(RenderTask.java:755)
at java.util.concurrent.CompletableFuture$AsyncSupply.run(CompletableFuture.java:1590)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
EDIT This happens only when the button style is not set OR the defaulted:
#style/Widget.MaterialComponents.Button
Setting as unelevated style works for example, so as a work around I'm using the tools namespace to show unelevated button style.
Edit 2 the app theme parent is already correctly set as Theme.AppCompat.Light.DarkActionBar. This is an IDE issue as it is running well on my emulator and device. I have also done a clear cache & invalidate, clean build, rebuild... (the standard things we do when faced with weird IDE problems)
Edit 3 Still no luck with the latest A.S. 3.4.1!

Update3: This is finally fixed in Studio 3.5beta2! We did it guys! 🥳
Update2: I've filed an issue here: https://issuetracker.google.com/issues/132562197. Please star for visibility.
Update: This is a cleaner workaround since we don't have to litter tools:style throughout our xml layouts. This has stopped working for me for no apparent reason, I've had to revert to my original workaround described below.
Here's a workaround till we get an actual fix, based on Gautham's discovery:
Add this style to your styles.xml:
<!-- For the sake of xml preview not breaking -->
<style name="UnelevatedButton" parent="Widget.MaterialComponents.Button.UnelevatedButton">
</style>
Add it to your Buttons like so:
<Button
...
tools:style="#style/UnelevatedButton"
style="#style/ActualButtonStyle"
/>
Note that the ordering of the two is important, the tools line needs to come first.
You can update your UnelevatedButton to match your ActualButtonStyle for the sake of having previews consistent with your actual runtime buttons.

I'm attempting to reproduce this issue currently, but I need more information. My current hypothesis is that it's related to button elevation (based on the animation calls in the stacktrace), which is also why unelevated button works as expected.
Could you please file an issue at https://issuetracker.google.com/issues/new?component=439535&template=1121918 with the component name and description, as well as the information requested there?

amitav13's solution has one major problem, when you reformat the code the default rules will rearrange all the attributes and then everything breaks again.
Instead, until this is fixed, my proposal is to create a separate application theme for using in preview windows, in this example this Theme is called AppTheme.PreviewFix.
Simply select this theme in Preview / Design panes.
attrs.xml
<?xml version="1.0" encoding="utf-8"?>
<resources>
<attr name="buttonStyle" format="reference" />
</resources>
styles.xml
<?xml version="1.0" encoding="utf-8"?>
<resources>
<style name="AppTheme" parent="Theme.MaterialComponents">
<item name="colorPrimary">#color/primaryColor</item>
<item name="colorPrimaryDark">#color/primaryDarkColor</item>
<item name="colorSecondary">#color/secondaryColor</item>
<item name="windowActionBar">false</item>
<item name="windowNoTitle">true</item>
<item name="buttonStyle">#style/AppTheme.Button</item>
</style>
<style name="AppTheme.PreviewFix" parent="AppTheme">
<item name="buttonStyle">#style/AppTheme.Button.PreviewFix</item>
</style>
<style name="AppTheme.Button" parent="Widget.MaterialComponents.Button"/>
<style name="AppTheme.Button.PreviewFix" parent="Widget.MaterialComponents.Button.UnelevatedButton"/>
</resources>
my_layout.xml
<com.google.android.material.button.MaterialButton
style="?buttonStyle"
...
</com.google.android.material.button.MaterialButton>

Set your application theme from AppCompat to MaterialComponents such as below:
Use below style:
<style name="AppTheme" parent="Theme.MaterialComponents.Light.DarkActionBar">
<!-- Customize your theme here. -->
<item name="colorPrimary">#color/colorPrimary</item>
<item name="colorPrimaryDark">#color/colorPrimaryDark</item>
<item name="colorAccent">#color/colorAccent</item>
</style>
instead of
<style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
<!-- Customize your theme here. -->
<item name="colorPrimary">#color/colorPrimary</item>
<item name="colorPrimaryDark">#color/colorPrimaryDark</item>
<item name="colorAccent">#color/colorAccent</item>
</style>

I had the same problem, I've downloaded another version of Android Studio.
It's Working Fine on A.S. 3.6 Canary 3...
I'm Using API 29, and material_version = '1.1.0-alpha08'
Download it here
The last working version for my earlier Android Studio was material_version = '1.0.0'.
But it didn't have some of the new material component features, so Instead of rolling back, I decided to Update Android Studio.
Do what best suits your needs.
Cheers.

Why is my layout not showing in Android Studio?

As you can see, I have a text view and a button but none of it is showing on the device. The device is empty, so I'm wondering how can I get these things to show? Nothing so far has been working, I already tried clicking on the magic wand.

This is one of the problems, I Encountered while working in android.
You have to edit your res/values/styles.xml file
<!-- Base application theme. -->
<style name="AppTheme" parent="Base.Theme.AppCompat.Light.DarkActionBar">
<!-- Customize your theme here. -->
</style>
Steps are as following:
Go to res/values/
open styles.xml
change from -> style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar"
change to -> style name="AppTheme" parent="Base.Theme.AppCompat.Light.DarkActionBar"
(Just prepend "Base." to "Theme".)
Save the file and check Preview now.
Preview will Work Perfeclty now.

Why does select theme in Android Studio cause my layout become different

i using android studio to start develop apps, but i have some question about "Select Theme" in android studio. First, i noticed i select "NoActionBar" option, the layout will be like
The statusbar has no color, but after when i change to "AppTheme", the layout became
I had double check the code in styles.xml, but there are no changes. I really can't figure out about this. Can anyone explain this to me? Thank in advance.
**I have figured out actually select theme only the preview, it doesn't change my XML layout.

you will find this in styles.xml
<!-- Base application theme. -->
<style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
<!-- Customize your theme here. -->
<item name="colorPrimary">#color/colorPrimary</item>
<item name="colorPrimaryDark">#color/colorPrimaryDark</item>
<item name="colorAccent">#color/colorAccent</item>
</style>
In your layout, two things are happening here
1. Your layout have a toolbar in its xml. So toolbar always showing.
2. the above pic will give you an idea about how the material theme isapplying with colors.
Hope this helps you.

check the colorPrimary and the colorPrimaryDark in your color.xml file