Doubt about extension development

[Chocoduba_BR (Gabriel Andrade)]

Hello guys.
Recently I wanted to learn to create extensions, so I started learning the basics of Java, and now I want to create my first extension, and I am trying to make a basic extension to get ringtone title.

I wrote a simple file using rush, but I am unable to build the extension.

package io.Teste;

import com.google.appinventor.components.annotations.SimpleFunction;
import com.google.appinventor.components.runtime.AndroidNonvisibleComponent;
import com.google.appinventor.components.runtime.ComponentContainer;
import com.google.appinventor.components.runtime.errors.YailRuntimeError;
import com.google.appinventor.components.runtime.util.YailList;
import android.media.Ringtone;
import android.content.Context;
import java.lang.Object;

public class Teste extends AndroidNonvisibleComponent {
  public Teste(ComponentContainer container) {
    super(container.$form());
  }
	@SimpleFunction(description = "Returns the sum of the given two integers.")
	public int Sum(int a, int b) {
	return a + b;
  }
	@SimpleFunction(description = "Return the ringtone title.")
	public String getTitle (Context context) {
	return getTitle;
  }
}

What I am doing wrong?
Error Output:

[vknow360 (Sunny Gupta)]

Java != Java Android
Learning Java means that you have a language to access Android APIs.

---

The thing wrong here is that what exactly getTitle is?

[iamwsumit (Sumit Kumar)]

@Chocoduba_BR

public String getTitle (Context context)

The problem is here.
You can’t take the Context variable as a parameter in your extension. You will have to make the context variable wantin your java file and fill it in your class’s super constructor like this

context=container.$context
And you can use this anywhere wherever you want

P.S as @vknow360 said getTitle is not a variable or a parameter so you can’t return it.It will be the another error when you will solve the context error.

[Chocoduba_BR (Gabriel Andrade)]

Thank you for the answers,
I am scrapping some open source extensions to understood better how the code works, maybe I made a step bigger than my legs

@iamwsumit

You will have to make the context variable wantin your java file and fill it in your class’s super constructor like this

Sorry I didn’t understand 100% what you are saying. What do you mean by super constructor?

[iamwsumit (Sumit Kumar)]

@Chocoduba_BR

What do you mean by super constructor

Here is your super constructor

@Chocoduba_BR

public Teste(ComponentContainer container) {
    super(container.$form());
  }

Jusr add my this line below container.$form after making the private context variable

@iamwsumit

context=container.$context

And you can use this context variable

[Chocoduba_BR (Gabriel Andrade)]

Like this?

[iamwsumit (Sumit Kumar)]

@Chocoduba_BR

Like this?

Yes…
But the problem is still not fixed.
As I said above

@iamwsumit

@Chocoduba_BR

public String getTitle (Context context)

The problem is here.
You can’t take the Context variable as a parameter in your extension.

P.S you have not created the private Context variable yet

[Chocoduba_BR (Gabriel Andrade)]

Yeah, now I will try to solve this, thanks for answering and helping me.

[Rogerio_Rios (Professional Support)]

Criar Extensões App Inventor (Part 1)

[vknow360 (Sunny Gupta)]

I think these things can be easily learnt by exploring open source extensions and basic Java tutorials.
Otherwise someday someone will just post "How to create a class? What is Java? How to create extension without learning Java? "