How do you import a second .java class to MIT App Inventor extension?

Passos_0213 · October 21, 2023, 3:20pm

import io.deps.Currency;

//@UsesLibraries(libraries = "Currency.jar")
@DesignerComponent(
        version = 1,
        description = "Extension to assist financial and statistical calculations",
        category = ComponentCategory.EXTENSION,
        nonVisible = true,
        iconName = "images/extension.png"
)
@SimpleObject(external = true)
public class FinancialCalculator extends AndroidNonvisibleComponent {

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

    @SimpleFunction(description = "Format an integer as Brazilian currency")
    public String FormatCurrency(int amount, @Options(Currency.class) final String currencyCode) {

I created the Currency class (Currency.java) that works with financial calculations. I'm having trouble importing the Currency class correctly into the main FinancialCalculator.java file. Please help me!

Patryk_F · October 21, 2023, 3:44pm

Show your Package declaration and write where the Currency class is located. Ok, I see that the Currency class is a helpers class. This class should be placed in the "helpers" folder, this folder should be in the same place as the main class of your extension.
If the Package for your extension is "io.deps", then the import for Currency should then look like this:
"io.deps.helpers.Currency"

io:
- deps:
  FinancjalCalculator.java
  - helpers:
    Currency.java

Passos_0213 · October 21, 2023, 4:15pm

Thank you!

Passos_0213 · October 21, 2023, 7:06pm

How could I include an external library like apache Math – Download Apache Commons Math and how to import the methods?

Patryk_F · October 21, 2023, 7:13pm

You need to download the JAR library, place it in the "deps" folder, and then use the annotations in the extension:
@UsesLibraries(libraries = "class.jar")

Passos_0213 · October 21, 2023, 7:14pm

thanks

Patryk_F · October 21, 2023, 7:15pm

The "deps" folder will be in a different location depending on whether you are using appinventor-sources or extension-template.

Passos_0213 · October 21, 2023, 7:25pm

import org.apache.commons.math3.distribution.NormalDistribution;
import org.apache.commons.math3.distribution.ExponentialDistribution;
import org.apache.commons.math3.distribution.PoissonDistribution;

@UsesLibraries(libraries = "commons-math3-3.6.1.jar")
@DesignerComponent(
        version = 1,
        description = "Extension to assist financial and statistical calculations",
        category = ComponentCategory.EXTENSION,
        nonVisible = true,
        iconName = "images/extension.png"
)
@SimpleObject(external = true)
public class FinancialCalculator extends AndroidNonvisibleComponent {

Like this?

Patryk_F · October 21, 2023, 7:31pm

Yes

import org.apache.commons.math3.distribution.NormalDistribution;

Passos_0213 · October 21, 2023, 7:33pm

excellent! It worked!

Passos_0213 · October 21, 2023, 8:00pm

AndroidRuntime:
    [mkdir] Created dir: /home/iaiaia/Documentos/Kodular/CriarExtensoes/appinventor-sources/appinventor/components/build/classes/AndroidRuntime
    [javac] Compiling 366 source files to /home/iaiaia/Documentos/Kodular/CriarExtensoes/appinventor-sources/appinventor/components/build/classes/AndroidRuntime
    [javac] warning: [options] bootstrap class path not set in conjunction with -source 7
    [javac] Note: Wrote file file:///home/iaiaia/Documentos/Kodular/CriarExtensoes/appinventor-sources/appinventor/components/build/classes/AndroidRuntime/simple_components.json
    [javac] Note: Wrote file file:///home/iaiaia/Documentos/Kodular/CriarExtensoes/appinventor-sources/appinventor/components/build/classes/AndroidRuntime/simple_components.txt
    [javac] Note: Wrote file file:///home/iaiaia/Documentos/Kodular/CriarExtensoes/appinventor-sources/appinventor/components/build/classes/AndroidRuntime/simple_components_build_info.json
    [javac] Note: Wrote file file:///home/iaiaia/Documentos/Kodular/CriarExtensoes/appinventor-sources/appinventor/components/build/classes/AndroidRuntime/AutogeneratedOdeMessages.java
    [javac] Note: Wrote file file:///home/iaiaia/Documentos/Kodular/CriarExtensoes/appinventor-sources/appinventor/components/build/classes/AndroidRuntime/ComponentsTranslation.java
    [javac] /home/iaiaia/Documentos/Kodular/CriarExtensoes/appinventor-sources/appinventor/components/src/io/kodular/FinancialCalculator.java:38: error: package org.apache.commons.math3.distribution does not exist
    [javac] import org.apache.commons.math3.distribution.NormalDistribution;
    [javac]                                             ^
    [javac] /home/iaiaia/Documentos/Kodular/CriarExtensoes/appinventor-sources/appinventor/components/src/io/kodular/FinancialCalculator.java:39: error: package org.apache.commons.math3.distribution does not exist
    [javac] import org.apache.commons.math3.distribution.ExponentialDistribution;
    [javac]                                             ^
    [javac] /home/iaiaia/Documentos/Kodular/CriarExtensoes/appinventor-sources/appinventor/components/src/io/kodular/FinancialCalculator.java:40: error: package org.apache.commons.math3.distribution does not exist
    [javac] import org.apache.commons.math3.distribution.PoissonDistribution;
    [javac]                                             ^
    [javac] Note: Some input files use or override a deprecated API.
    [javac] Note: Recompile with -Xlint:deprecation for details.
    [javac] 3 errors
    [javac] 1 warning

BUILD FAILED
/home/iaiaia/Documentos/Kodular/CriarExtensoes/appinventor-sources/appinventor/build.xml:73: The following error occurred while executing this line:
/home/iaiaia/Documentos/Kodular/CriarExtensoes/appinventor-sources/appinventor/components/build.xml:228: The following error occurred while executing this line:
/home/iaiaia/Documentos/Kodular/CriarExtensoes/appinventor-sources/appinventor/build-common.xml:125: Compile failed; see the compiler error output for details.

import org.apache.commons.math3.distribution.NormalDistribution;
import org.apache.commons.math3.distribution.ExponentialDistribution;
import org.apache.commons.math3.distribution.PoissonDistribution;

@DesignerComponent(
        version = 1,
        description = "Extension to assist financial and statistical calculations",
        category = ComponentCategory.EXTENSION,
        nonVisible = true,
        iconName = "images/extension.png"
)
@UsesLibraries(libraries = "commons-math3-3.4.jar")
@SimpleObject(external = true)
public class FinancialCalculator extends AndroidNonvisibleComponent {

JAR file: https://repo1.maven.org/maven2/org/apache/commons/commons-math3/3.4/commons-math3-3.4.jar

Patryk_F · October 21, 2023, 8:40pm

I don't know where you placed the jar file.

Passos_0213 · October 21, 2023, 8:49pm

All files: kodular - Google Drive
in deps

Patryk_F · October 21, 2023, 9:02pm

You cannot create the deps folder. This folder already exists in appinventor-sources, you need to add your library to it.

home/iaiaia/Documentos/Kodular/CriarExtensoes/appinventor-sources/appinventor/build/components/deps/

Taifun · October 21, 2023, 9:09pm

Please see the Extensions document about how to work with external libraries

http://ai2.appinventor.mit.edu/reference/other/extensions.html

Taifun

Passos_0213 · October 21, 2023, 9:09pm

I did this but I still get the error "error: package org.apache.commons.math3.distribution does not exist"

Passos_0213 · October 21, 2023, 9:20pm

I already solved this part

Patryk_F · October 21, 2023, 9:25pm

What was the reason?

Passos_0213 · October 21, 2023, 9:33pm

These files are deleted every time I run the "ant extensions" command. This is a problem?

home/iaiaia/Documentos/Kodular/CriarExtensoes/appinventor-sources/appinventor/build/components/deps/

Patryk_F · October 21, 2023, 9:35pm

It is not possible to delete files from the deps folder because all the jar libraries built into appinventor are in this directory.