Android Studio's review layout did not show text. Why this happen? - android

This problem happen after android studio suddenly close itself. I feel relieve when i see the interface output can show it's text but, it annoy me when i try to codes the interface and there is no text shown there. How can i solve this problem and what make this problem occur?

I already solve this problem by use the new render layout. I kind a hesitate to use it at first because i have face this problem before and it is also render problem. No matter how many time i change my codes according to suggestion and change the render layout. Still nothing works. I need start from scratch because i can't find the solution. But this time it's work.

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What can be the reason of this weird halogen symbol in FAB in Android

I am trying to use some animations on my FAB. I have different themes and in one of them when I open the FAB (after it undergoes) the animation I see this halogen symbol. Tried debugging for couple of hours now, but can't find the possible reason.
I am not sure if it is due to the animation I am trying to use, but I have not added anything which can make this happen. I am very much confused and any help would be appreciated. Even if you have any idea what could be the possibilities of fixing this please mention them in comment so I can try.
This is how it looks :

Android TV Leanback Settings Fragment present multiple items as focused

I noticed something strange after implementing and testing a settings screen for my TV app using the LeanbackSettingsFragmentCompat class, please see attached image:
As you can see, after navigating with the remote to other items, the items no longer in focus still retain their focused background state, I was only able to reproduce this behaviour on one device, and it rarely happens
This problem has left me a bit perplexed,as this is not my implementation but rather Leanback's.. But still, I have never seen a TV app with this problem
Has anyone ever encountered such an issue? Could I have made a mistake to cause something like that?
I would be happy to share code, but at this point I don't know if my code is even relevant to this problem
Thanks in advance

Stuck on layout format

Recently did a refreshers course in Android. I see that they changed a lot with the update. I have run into a few problems which I hope someone can help me figure out. The course gave me this code to be able to add in a button and make it activate for Android. However, this code is slightly outdated and I have attached the screenshot of the code I tried to fix according to what Andriod wants. think most of the problem is that with the new andriod sutidio I am working with this layout :androidx.constraintlayout.widget.ConstraintLayout
I would like to know in the ain activity how can I fix the problem in the screenshot attached to get this right. Please help because I can't move forward until I figure out the problem. I would like to know how do I change the "R" to the right code for constraint layout.
If you have error of R, then follow below steps.
Go to File menu in android studio and click on Invalidate cache / restart option.
Then clean your project.

Issue using slider in Android activity

I used this tutorial: http://androidopentutorials.com/android-image-slideshow-using-viewpager/ but I have a problem when I use the slide in a second activity.
I think the problem is in this line:
android:name="com.androidopentutorials.imageslideshow.AppData"
How can I fix this issue?
You need to be more specific. What is the problem? Is your app crashing, or is it not behaving as expected?
If you want help you'll need to post as much detail as possible, include any errors you encounter and the relevant java and xml files.

Notification for keyboard fires

Is there anyway to get a know when a keyboard (dis)appears?
Actually I'm trying to implement this
I haven't found anything which answers my question. I think I wasn't clear enough.
This
https://groups.google.com/forum/?fromgroups=#!topic/android-developers/nRaBoB8F54I
is a pretty old thread but it explains my problem pretty well.
I was wondering if there's any solution available to this now.
Please help. Thanks. :)
I'm not sure if this will work, you can try it and let me know. But if you put
android:configChange="keyboardHidden"
in your manifest for the activity, that will make it call onConfigChange of your activity passing it in a Configuration object where you can query the keyboardHidden member variable and see if its the same as it was last time or not. Note you will also have to check hardKeyboardHidden to tell if it was a slideout keyboard that went away or the software keyboard.
The problem is I know this works for pulling out the hardware keyboard. I don't know if it also calls you for displaying the software keyboard. Worth a try though.

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