Add list parameter to method (Extension)

[iamwsumit (Sumit Kumar)]

You have not imported the yaillist class in your extension so the error is causing
Use an IDLE like VS code or intelliJ
Using texteditor your work increases

[Pythony (Sumanyu Aggarwal)]

From where to import it?

I have already imported java.util.*

[Salman_Dev (Salman Developer)]

this topic has just been released, hmm something strange

How can i ask list in extension

[Mohamed_Tamer]

@Pythony

From where to import it?

The YailList is an app Inventor, and not java class , in the package com.google.appinventor.components.runtime.util, so it’s import would be com.google.appinventor.components.runtime.util.YailList

[electrobot_appy (HIFI APPS)]

1. import com.google.appinventor.components.runtime.util.YailList;
2. import com.google.appinventor.components.runtime.util;
   add these 2 lines
   
   
3. replace ur code

@SimpleFunction(description = “this block is where u put ur component,colors,u may have dout what is orientation it is where u put the green block i gave in gradients section”)
public void SetGradientBackgroundcolor(AndroidViewComponent component, Object orientation, YailList colors) {

// To set gradient colors as background, what we are actually going to
// do is create a new GradientDrawable object and set it as
// the background of the view. With this approach, it’d be possible to
// create gradients programmatically without editing the manifest
// file which is currently not supported in App Inventor 2.

// Getting the reference to the View of the parameter component using
// the getView() method of AndroidNonVisible class.
View view = component.getView();

// GradientDrawable is a subclass of Drawable class from Android
// support library. It is mostly used to create gradients.
// For more info visit: https://developer.android.com/reference/android/graphics/drawable/GradientDrawable
int array = new int[colors.size()];
int index = 0;
for(String e : colors.toStringArray()) {
array[index] = Integer.parseInt(e); index++;
}

GradientDrawable gradientDrawable = new GradientDrawable(
(GradientDrawable.Orientation) orientation, array);

// Setting the gradientDrawable as the background of view.
view.setBackground(gradientDrawable);
}

ur done this is total code for list

[Salman_Dev (Salman Developer)]

@electrobot_appy if you want to share code in the community you should make it like this :

```
//your code here
```

---

Result :

    //your code here

[Pythony (Sumanyu Aggarwal)]

Thank you everybody!

Finally it is solved!

[electrobot_appy (HIFI APPS)]

How can i ask list in extension - Extension Development - MIT App Inventor Community this is were i got solution as i was wrking on same goal

[WatermelonIce (Bryan)]

@Kenin

No, you can’t pass arrays as parameter.

Sorry, I didn’t say that. I was saying java.util.ArrayList is a possible type. I think I have discussion with @Mohamed_Tamer before. I understand using YailList is best.

[Kenin]

@WatermelonIce

[WatermelonIce (Bryan)]

Looks like I mis-posted.