Develop Reference

'this#ActivityName' is not captured error Android/Kotlin

I'm repairing my friend's code and got confused.
My friend wants to fetch entered text (in EditText). Seems easy, right? Well, it is but instead of user input, he gets this warning/error:
To be honest I'm not sure how to fix it. He is coding in Kotlin (Android 10).
Activity that contains EditText:
And XML:
This is how it looks when debugging:
The app started working just fine after running "File -> invalidate Cashes/Restart" option, I just don't understand where this warning came from and how to fix it because the error remained unchanged (even though the app works). Do you have an idea how to solve it?
All the best!

fyi lambda expression like setOnClickListener from kotlin is not debuggable, see here.
if you want to debug variables inside setOnClickListener you should use the normal one e.g. setOnClickListener(object: View.OnClickListener {..})

sometimes there will be problem in auto generated binding files, if so it will be solved after invalidate cache and restart ide. sometimes the warning/error show but the project and complied without errors. so no need to worry about that. for next time post the code as code not screen shots.

I understand that the question is regarding evaluating expression, but there is a way you can read variables from your debugger console, even if you're inside an anonymous callback. I found it helpful sometimes. Here are the steps:
First enter debugger mode inside of your anonymous callback,
In your debugger console, look at the right side for "Frames"
Within Frames under , you'll see stack of function execution first top one on the list is the latest:
Click on row(s) below the latest function, until you find an instance of your activity AddInformationActivity. You will see the activity instance on the right side window under Variables. Don't go as far as selecting functions browned out, because those are from internal libraries.
When you see you AddInformationActivity instance, you can expand it and see its variables.
Hope that helps!

It's not a beautiful way, but if you create a method like this:
private fun debug() {
println()
}
and add a breakpoint on the println() it'll capture the activity.
(Don't use TODO as it'll crash the app with a NotImplementedError once called.)
I have this method now in my code all the time to call it whenever I need it.
I know, that question is old, but I just stumbled over it and needed a way.

Problems with Listpicker App Inventor

I'm a beginner at App Inventor and I don't know what I'm doing wrong with the listpicker.
I am trying to create and app to reproduce the music I have stored in my server but when i display the listpicker I can't click any of the options and also I can't go back to the first screen. Here I put my code:
Image 1
Image 2
I tried to remove the line that says call listpicker.open but it only made appear a totally black screen.
The result of the code I just posted is exactly what I spect a list with the name and the link of the 2 songs I already upload to my server but when I click them it didn't do anything.
Thanks for your help.

The Web component works asynchronously, which means, it takes a little bit, until the result is available. The result you will get in the Web.GotText event.
Therefore it does not make sense to call the updateListpicker procedure in the Listpicker.BeforePicking event, because the result still is not available and you get displayed an empty listpicker. The listpicker will be opened, before you have received the result!
Set the listpicker to visible=false and use a button.click event to call the updateListpicker procedure. Then as you already do it in the Web.GotText event, assign the received list to the listpicker and open it.

Android Minesweeper project(from codeproject.com)

Here is the link of the Minesweeper project on codeproject.com.
I just wanted to ask one thing here. I completely understood the logic and algorithm this guy used, but when he called the showMineField() method inside startNewGame() method , he called it after createMineField(). I am really confused! Shouldn't the layout be set before setting up mines and handling the user click events? But the code seems to work fine. If I just call showMineField() inside startNewGame() , it gives me NullPointerException.

This is because you cannot show a mine field before creating all the objects.
It is like trying to run without legs. If you call showMineField() that is using objects that have not been initialized. Thats why you are recieving a NUllPointerException. Nullpointer is throws when a method is trying to be call on an object that has not been created yet. createminefield() initialzes everything so that nullpointer is not thrown

Flash game - returning to main menu

I am working on a flash game and about finished with it but I'm running into an issue. When the game ends, or the user presses the "End Game" button I want to return them to the main menu. The game is set up so that the main menu is on the 3rd frame, and the game runs in the 4th frame. All of the game code is there.
A few things I have tried:
I just simply tried to return to the 3rd frame. This results in the error:
TypeError: Error #1009: Cannot access a property or method of a null object reference.
at Hundred_fla::MainTimeline/GotoEndGame()[Hundred_fla.MainTimeline::frame5:66]
I have tried returning all the game vars to their default values, removing all children... so on... I also get the exact same error... not sure what the problem is. I thought one solution would be to reload the movie, but this will be running on Android/IOS and I cannot refresh a webpage. ... any help would be greatly appreciated. Thanks
Edit: The code on line 66 is:
while(stage.numChildren > 0){
stage.removeChildAt(stage.numChildren-1);
}

You should lock stage link before trying to purge it of objects. You are seemingly removing the instance that runs the code, so it loses stage reference.
var theStage:Stage=stage;
while(theStage.numChildren > 0){
theStage.removeChildAt(0);
//you can always be sure that element at [0] exists, rather than going for [numChildren-1]
}

Depending on what's line 66 of the 5th frame, it could a few things:
you are targeting Flash Player 9, where the display objects are loaded asynchronously to your gotoAndStop call, so you end up with null references. Solution is to target Flash Player 10 or 11 (change it in Publish Settings [Ctrl+Shift+F12]). If you really need to target Flash Player 9, there are convoluted methods to ensure the attributes are accessible
after the gotoAndStop you are referencing an object from the 5th frame, which is not available anymore, and thus throws a null object reference error
it's an error in your logic and we need to see some of the code to find it
When in doubt, it's always best to leave the gotoAndStop call as the last one in the method.
Edit:
After seeing the code, it seems that stage itself is null and thus throwing the error. If it makes no visible difference, you can surround your code with a try/catch:
try {
while(stage.numChildren){
stage.removeChildAt(0);
}
} catch (error:Error) {
}
Also try listening to the ADDED_TO_STAGE event to make sure you have a valid reference to stage before accessing it.

The child(wySprite, x) is already attached to another parent(wySprite, xx), skip addChild

Hi I am using Wiengine for making my game and I am getting this error
The child(wySprite, x) is already attached to another parent(wySprite, xx), skip addChild
Can any one let me know how this error can be resolved

It means the sprite already has a parent node. If you see this error, generally you have some wrong logic in your code. Well, currently WiEngine is open-sourced, you can directly debug it. https://github.com/stubma/WiEngine