Can I Use a Screen as an Activity?

Extensions Extension Development
, ,
1

I am working on an extension and need to switch activities using a class name. I want to know if it’s possible to use a screen in Kodular as an Android activity. How can I activate a screen by its class name? Can this be done using intents? If so, what is the correct approach?

Also, how to disable the default transition/Animation after starting the screen.

Any guidance or example blocks would be really helpful!

2

@Still-learning
Can u help me in this case

3

Yes you can launch them with intents.
This is how you get a class for a particular screen.

  private Class getClass(String screenName){
    try {
      return Class.forName(form.getPackageName()+"."+screenName);
    } catch (ClassNotFoundException e) {
      throw new YailRuntimeError(screenName+ "not found","Screen not found");
    }
  }

You can then launch it with intent like this:

context.startActivity(new Intent(form, class));

4

May be you can try this too

package com.Jai.ScreenSwitcher;

import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import com.google.appinventor.components.annotations.*;
import com.google.appinventor.components.common.ComponentCategory;
import com.google.appinventor.components.runtime.AndroidNonvisibleComponent;
import com.google.appinventor.components.runtime.ComponentContainer;

@DesignerComponent(
        version = 1,
        description = "An extension to switch screens using class names in Kodular.",
        category = ComponentCategory.EXTENSION,
        nonVisible = true,
        iconName = "https://your-icon-url.com/icon.png")
@SimpleObject(external = true)
public class ScreenSwitcher extends AndroidNonvisibleComponent {

    private final Context context;

    public ScreenSwitcher(ComponentContainer container) {
        super(container.$form());
        this.context = container.$context();
    }

    @SimpleFunction(description = "Opens a screen by its class name and removes the transition animation.")
    public void OpenScreen(String screenName) {
        try {
            Intent intent = new Intent();
            String packageName = context.getPackageName();
            intent.setClassName(packageName, packageName + "." + screenName);
            context.startActivity(intent);

            // Disable transition animation
            if (context instanceof Activity) {
                ((Activity) context).overridePendingTransition(0, 0);
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}
5

Both @iamwsumit and @Still-learning thanks
Both suggest help me a lot.:heart:

1 Like
6

@iamwsumit
@Still-learning
One more thing Can we modify layout xml file by using java code
suppose ,add new properity like android:text="Hello, I am a TextView" />
how can we do that by java

7

Yes you can, you must inflate that view(XML layout) first then you can modify that view or can get its children with java code.

8

Can u show a java code example

9

Check whether this will work for you or not

Method to modify the text

@SimpleFunction(description = "Sets the text of a TextView")
public void SetTextViewText(AndroidViewComponent component, String text) {
    View view = component.getView();
    
    if (view instanceof TextView) {
        TextView textView = (TextView) view;
        textView.setText(text);
    } else {
        // Handle error - component is not a TextView
        throw new IllegalArgumentException("Component is not a TextView");
    }
}

Method to modify textview properties

@SimpleFunction(description = "Sets the text size of a TextView")
public void SetTextViewSize(AndroidViewComponent component, int size) {
    View view = component.getView();
    
    if (view instanceof TextView) {
        TextView textView = (TextView) view;
        textView.setTextSize(size);
    } else {
        throw new IllegalArgumentException("Component is not a TextView");
    }
}

@SimpleFunction(description = "Sets the text color of a TextView")
public void SetTextViewColor(AndroidViewComponent component, int color) {
    View view = component.getView();
    
    if (view instanceof TextView) {
        TextView textView = (TextView) view;
        textView.setTextColor(color);
    } else {
        throw new IllegalArgumentException("Component is not a TextView");
    }
}

Method to add new textview in the layout

@SimpleFunction(description = "Adds a new TextView to a layout component")
public void AddTextViewToLayout(AndroidViewComponent layoutComponent, String text) {
    View view = layoutComponent.getView();
    
    if (view instanceof ViewGroup) {
        ViewGroup layout = (ViewGroup) view;
        
        // Create a new TextView
        TextView newTextView = new TextView(context);
        newTextView.setText(text);
        
        // Set layout parameters
        ViewGroup.LayoutParams params = new ViewGroup.LayoutParams(
            ViewGroup.LayoutParams.WRAP_CONTENT,
            ViewGroup.LayoutParams.WRAP_CONTENT
        );
        
        // Add the TextView to the layout
        layout.addView(newTextView, params);
    } else {
        throw new IllegalArgumentException("Component is not a layout");
    }
}

These three logic only i have used in my DynamicCalendar extension

Complex one. Find textview by ID

@SimpleFunction(description = "Sets the text of a TextView with the given ID")
public void SetTextViewTextById(AndroidViewComponent component, int viewId, String text) {
    View parentView = component.getView();
    
    // Find the TextView by ID in the component's view hierarchy
    TextView textView = (TextView) parentView.findViewById(viewId);
    
    if (textView != null) {
        // Set the text property
        textView.setText(text);
    } else {
        throw new IllegalArgumentException("TextView with ID " + viewId + " not found");
    }
}
1 Like