I created row

Question

I created row

neil.armstrong · Answer

probably better to use a thread to prevent spam Could you paste the activity so I can see how you are setting it up

Hele · Answer

sure

Hele · Answer

but is this slack not about also solving problems

Hele · Answer

so it could be an example for others also in case they need

neil.armstrong · Answer

it is that s why I m helping you slightly smiling face Just don t want to send messages to all 15k users at once It is better to do this kind of thing in a thread if we can

Hele · Answer

Hele · Answer

oh ok sure

Hele · Answer

no problem

Hele · Answer

I mean my code should be fine s I did read and watched examples

neil.armstrong · Answer

Looks like you are setting the content view to `ZXingScannerView` rather than your activity layout I haven t played with scanners in a long time but I think that is a library provided view rather than your own

Hele · Answer

yes exactly

Hele · Answer

that is a provided library

neil.armstrong · Answer

``` public override fun onCreate state Bundle super onCreate state mScannerView = ZXingScannerView this Programmatically initialize the scanner view setContentView mScannerView Set the scanner view as the content view ```

neil.armstrong · Answer

that means that the call to grab the recycler view won t work as it isn t being shown

neil.armstrong · Answer

Ah man I did do this specific problem years ago with a QR code scanner I think it was the same library too

Hele · Answer

but I need to set it to scanner layout

Hele · Answer

as it has the camera and scanner

Hele · Answer

is not it correct

neil.armstrong · Answer

Yes and you want to overlay stuff on top of it

neil.armstrong · Answer

or just get the result from the scanning operation

Hele · Answer

it opens that scanning layout scans and get the result

neil.armstrong · Answer

if you just need the result you can do it as part of another activity and then just return the result via intents

Hele · Answer

which I do

Hele · Answer

I fill a list

neil.armstrong · Answer

I think from memory you need to do the scanning operation or at least it is easier from a separate activity

Hele · Answer

``` booksMutable add Book rawResult text toLong ```

Hele · Answer

that is a mutableList

neil.armstrong · Answer

yea that bit looks fine just maybe have another look at the ZX examples as it is where your issue is I believe

neil.armstrong · Answer

the kotlin code looks correctly from glancing at it

Hele · Answer

imo I dont have problem with the scan but maybe setting up the recycler view

Hele · Answer

as I am able to get the scan result of scan activity

Hele · Answer

```06 25 17 20 00 076 8652 8652 com okan pc mylbrary app I System out books size 1```

neil.armstrong · Answer

you are just inflating the scanner layout

neil.armstrong · Answer

yea it s because you aren t inflating your own layout

neil.armstrong · Answer

so the recycler view is never actually created unfortunately

Hele · Answer

but am I not doing it here

Hele · Answer

``` my recycler view layoutManager = LinearLayoutManager this my recycler view adapter = MainAdapter booksMutable ```

Hele · Answer

on ```onHandleResult```

neil.armstrong · Answer

that bit looks correct

neil.armstrong · Answer

it is ``` public override fun onCreate state Bundle super onCreate state mScannerView = ZXingScannerView this Programmatically initialize the scanner view setContentView mScannerView Set the scanner view as the content view ``` which is not correct I think you need to handle the scanning in a separate activity

neil.armstrong · Answer

as your main activity is just showing the ZX layout not your own xml layout that you have created with the recycler view

Hele · Answer

it is already an activity itself

Hele · Answer

``` button scan setOnClickListener val intent = Intent this ScanActivity class java startActivity intent ```

Hele · Answer

this is how I open scanner activity

Hele · Answer

maybe I need to open my main activity with an intent

Hele · Answer

lthough I use a ```onBackPressed ```

Hele · Answer

bcoz when I first open the app my list of mutableList shows up as 0 but after I scan and go back to main activity

Hele · Answer

it does not show size of that list

neil.armstrong · Answer

Ah I see what you are doing you need to move your recycler view logic to the other activity it cannot be in the `ScanActivity`

neil.armstrong · Answer

as it doesn t show the recycler view

Hele · Answer

it is in main activity

Hele · Answer

is notit

Hele · Answer

that is where I show it

neil.armstrong · Answer

``` booksMutable add Book rawResult text toLong val my recycler view = findViewById R id my recycler view as RecyclerView my recycler view layoutManager = LinearLayoutManager this my recycler view adapter = MainAdapter booksMutable println books size + booksMutable size ```

neil.armstrong · Answer

this bit I mean on your `ScanActivity`

neil.armstrong · Answer

as it won t work

Hele · Answer

I also have that on ```onCreate```

Hele · Answer

of my main activity

Hele · Answer

``` setContentView R layout activity main ```

Hele · Answer

``` lt RelativeLayout xmlns android= xmlns tools= android layout width= match parent android layout height= match parent tools context= MainActivity gt lt android support v7 widget RecyclerView android id= +id my recycler view android layout width= match parent android layout height= match parent android scrollbars= vertical gt lt Button android layout marginTop= 10dp android id= +id button scan android layout width= match parent android layout height= wrap content android layout alignParentBottom= true android text= string scan book gt lt RelativeLayout gt ```

neil.armstrong · Answer

yes but it doesn t have the result The flow will be 1 Start main activity 2 Do some action to start the scan activity via `startActivity` `var activity = ScanActivity ` creates a different from one Android so you cannot share data by making a mutable list like you are 3 On scan successful receive data in `handleResult` then send this result data back to the main activity via `startActivity` and an intent I recommend looking up the Android docs for how to do this

Hele · Answer

I know how to pass data between activities

Hele · Answer

I am just new to kotlin

Hele · Answer

I have already made an app with recycler view in java but in kotlin it just does not work this app is just for learning purposes slightly smiling face

neil.armstrong · Answer

from what I can see your approach won t work in java either though as it can not share data between the activities

neil.armstrong · Answer

the `my recycler view` is not accessible on the `ScanActivity`

Hele · Answer

yeah I get that part

Hele · Answer

now I am making an intent to share data to main activity

Hele · Answer

thanks for your help by the way

neil.armstrong · Answer

no worries best of luck thumbsup