How do I make an extension that retrieves the source code of a web page?

[Salman_Dev]

this can do the same thing too, so I think we don't need an extension for that @Meulencv

[Kumaraswamy]

Still, it's okay for learning

[Meulencv]

But I ned to do this, to later do the extension more complex, for example a extension that gives the bitcoin price.

[Meulencv]

Hello,
I would be very grateful if you could fix my code, thank you very much

[Anonymous]

@vknow360

Your code have two errors:

1. you haven't declared and initialized activity
2. there is no myEvent method in your code

You should use a Java IDE.

@Meulencv did you fixed that?

[Kumaraswamy]

I have the demo extension code which works.

Demo code

File name: Request.java

package com.kumaraswamy.request;

import android.app.Activity;
import com.google.appinventor.components.annotations.DesignerComponent;
import com.google.appinventor.components.annotations.SimpleEvent;
import com.google.appinventor.components.annotations.SimpleFunction;
import com.google.appinventor.components.annotations.SimpleObject;
import com.google.appinventor.components.common.ComponentCategory;
import com.google.appinventor.components.runtime.AndroidNonvisibleComponent;
import com.google.appinventor.components.runtime.ComponentContainer;
import com.google.appinventor.components.runtime.EventDispatcher;
import com.google.appinventor.components.runtime.util.AsynchUtil;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.URL;

@DesignerComponent(version = 1,
        category = ComponentCategory.EXTENSION,
        description = "Made my YOU",
        nonVisible = true,
        iconName = "ICON LINK")

@SimpleObject(external = true)

public class Request extends AndroidNonvisibleComponent {

    private Activity activity;

    public Request(ComponentContainer container) {
        super(container.$form());
        activity = container.$context();
    }

    @SimpleFunction
    public void DoRequest(final String website) {
        AsynchUtil.runAsynchronously(new Runnable() {
            @Override
            public void run() {
                BufferedReader in;
                try {
                    in = new BufferedReader(
                            new InputStreamReader(
                                    new URL(website).openStream()));

                    String inputLine;
                    final StringBuilder result = new StringBuilder();

                    while ((inputLine = in.readLine()) != null)
                        result.append(inputLine);

                    in.close();

                    activity.runOnUiThread(new Runnable() {
                        @Override
                        public void run() {
                            GotResult(result.toString());
                        }
                    });
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        });
    }

    @SimpleEvent
    public void GotResult(String result) {
        EventDispatcher.dispatchEvent(this, "GotResult", result);
    }
}

[Meulencv]

Thank you very much with all my heart @Kumaraswamy , I don't know how to thank you. IT WORKS!

[Nisarga_Adhikary]

used your code and got compile error in kodular

    Kodular is unable to compile this project.
The compiler error output was
________Preparing application icon
________Creating animation xml
________Creating fragment xml
________Creating listview xml in res/layout/..
________Creating listview xml in res/layout-v21/..
________Creating xml in res/drawable/..
________Creating splash png in res/drawable/..
________Creating colors xml
________Creating styles xml
________Creating drawables xml v21
________Checking for firebase
________Creating provider_path xml
________Creating network_security_config xml
________Generating adaptive icon file
________Generating round adaptive icon file
________Generating adaptive icon background file
________Generating manifest file
________Attaching native libraries
________Attaching Android Archive (AAR) libraries
________Attaching component assets
________Invoking AAPT
AAPT time: 1.217 seconds
________Compiling source files
.

[Meulencv]

I'm solving the problem

[Meulencv]

I have solved the problem, thank you very much for the warning.

[Kumaraswamy]

It's not the fault of the extension, I have compiled the code over two times...

[Patryk_F]

Extensions. I added this extension to an empty project and it hasn't compiled anymore.

[Meulencv]

Hi, it compiles correctly for me and the app works on the mobile. Have you tried v2 of the extension?

Bitcoin Price Extension

NEW VERSION V2 I have created a new version fixing the compilation problem that has been pointed out to me. Thanks to @Nisarga_Adhikary and @Patryk_F for alerting me. I have also tried to solve the problems regarding the name that @Taifun indicated to me. Download Here you can find the download link for the extension (works the same as before) com.meulencv.bitcoinpricev2.aix (8.9 KB)

[Nisarga_Adhikary]

Can you tell us what changes did you make in the source code which @Kumaraswamy provided?

[Meulencv]

It do like web scrapping,
When the extension get the source of the web page, it cut a part of the source to get the value like (btc price)

[Salman_Dev]

@Meulencv

When the extension get the source of the web page, it cut a part of the source to get the value like (btc price)

so i think it can be made without having to use extension?

[Meulencv]

Yes, but is more simple to use the extension

[vknow360]

:cough:

Extensions vs built-in Blocks

In 2015 Hal Abelson posted the following in the App Inventor Google Groups: 4 Aug 2015, 15:40:19 to MIT App Inventor Forum The MIT App Inventor team is delighted to announce the availability of Extension Components for testing. We hope the Extension Components will prove to be a major enhancement to App Inventor: Extensions provide a way for anyone to build their own App Inventor components, which others can then use in creating apps. App Inventor is free and open software, so people hav…

[Salman_Dev]

@Meulencv

Yes, but is more simple to use the extension

yeah I think you are right, but it's also simple without having to use extensions.
And I've done it > Click this <