I can't build my extension!

Hello Community!
I am creating my first extension using appypie editor. It is a extension to extract thumbnails from YouTube video. But I am unable to build it. Please Help me!


P.S I am building it but it is failing everytime :sob:

I don't have any experience of building extensions but I have visited the appy builder editor once.
When you create a new project, it asks for project type - Java, AIX, HTML and formats like that if I am right.
Looking at your extension (.java), I guess you are building it as a java project rather than an aix. Try creating a new project or changing the extension of the file to .aix.

No @Alaqmar_Bohori I have build it as an .aix file only.
It say's that it will take 5 minutes to build but after that the build automatically stops without any warning or something like that

Lets wait for an expert :grin:

public string GetThumbnail(videoid)
public String GetThumbnail(String videoId)

Also enter maxresdefault.jpg in quotes " "


@Techno_Vedang It is still not building and is saying
" Your Last Build Request: 5 minutes ago" and their is one more option of showing build log

show the build log

also show your code with changes suggested by me.

It's just a seconds look. Here is the problem:

And, what is "maxresdeault.jpg"? Is it a variable or string? It's just not a statement. You really need to learn the basics of Java.


If you create a project with appybuilder selecting the java project category then there will no build button will show


I fixed it for one of my friend. Now it will help u too

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;

@DesignerComponent(version = 1,  description = "Extension to obtain Youtube Video thumbnails",
    category = ComponentCategory.EXTENSION,
    nonVisible = true,   iconName = "http://appybuilder.com/extensions/icons/extension.png")
@SimpleObject(external = true)
public class Youtubethumb extends AndroidNonvisibleComponent {
private ComponentContainer container;
 * @param container container, component will be placed in
public Youtubethumb(ComponentContainer container) {
    this.container = container;

public String GetThumbnail(String Videoid) {

String make = "https://img.youtube.com/vi/" + Videoid + "/mqdefault.jpg";

return make;


Make sure to put ur project name as Youtubethumb or if u change, then change the name in Public class and component container.

Sample aix of the code

com.appybuilder.anshmishra2166.Youtubethumb (1).aix (5.3 KB)


But it is not showing me any error

@GT-Game_and_Tech U tried mine ?