How to create vertical arrangment using an extension?

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In HVArrangement:

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image982×494 33.3 KB

You need to specify container, orientation and scrollable.
Therefore,

import android.content.Context;
import android.util.Log;
import com.google.appinventor.components.annotations.*;
import com.google.appinventor.components.runtime.*;
import com.google.appinventor.components.common.ComponentCategory;
import com.google.appinventor.components.common.ComponentConstants;
import android.view.View;

@DesignerComponent(version = 1,  description = " made by Soham Shah",
        category = ComponentCategory.EXTENSION,
        nonVisible = true,   iconName = "http://yusufcihan.com/img/favicon.png")
@SimpleObject(external = true)
public class DynamicArrangements extends AndroidNonvisibleComponent {
    private ComponentContainer container;
    /**
     * @param container container, component will be placed in
     */
    public DynamicArrangements(ComponentContainer container) {
        super(container.$form());
        this.container = container;
    }
   @SimpleFunction(description = "Creates a dynamic arrangement in selected arrangement.")
    public void CreateArrangement(AndroidViewComponent component) {
      new HVArrangement((ComponentContainer)component, LAYOUT_ORIENTATION_HORIZONTAL /*or LAYOUT_ORIENTATION_VERTICAL*/, true //or false depends on scrollable or not)
}

Note

  1. Constant of orientation:
static final int LAYOUT_ORIENTATION_HORIZONTAL = ComponentConstants.LAYOUT_ORIENTATION_HORIZONTAL; //0

static final int LAYOUT_ORIENTATION_VERTICAL = ComponentConstants.LAYOUT_ORIENTATION_VERTICAL; //1