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This commit is contained in:
Gregory Rudolph
2026-08-20 17:42:22 -04:00
parent 3bca77ffb5
commit b4a5dbbde1
10 changed files with 537 additions and 5 deletions
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.gitignore
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.DS_Store
*.jar
build
*.iml
.gradle
/local.properties
/.idea
.DS_Store
build/
captures/
.externalNativeBuild
.cxx
*.jar
!gradle/wrapper/gradle-wrapper.jar
README.md
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# a3270
An Android TN3270 terminal emulator based on `lib3270j` / `j3270`, built with Jetpack Compose and ported using AI.
## Repositories
- **a3270 (Android App)**: https://git.hugfreevikings.wtf/rudi/a3270
- **j3270 (Desktop App & `lib3270j` Core Library)**: https://git.hugfreevikings.wtf/rudi/j3270
`a3270` relies on the shared 3270 protocol library (`lib3270j`) provided by the `j3270` repository.
## Prerequisites
- **Java Development Kit (JDK)**: JDK 17 or JDK 21
- **Android SDK**: Android SDK with API 34 platforms and build-tools installed (`ANDROID_HOME` or `ANDROID_SDK_ROOT` set)
## Setup & Building
### 1. Clone Repositories Side-by-Side
For the easiest setup, clone both `j3270` and `a3270` into the same parent folder:
```bash
git clone https://git.hugfreevikings.wtf/rudi/j3270.git
git clone https://git.hugfreevikings.wtf/rudi/a3270.git
cd a3270
```
> **Note:** If `j3270` is located in another directory, specify its location via the `J3270_DIR` environment variable:
> ```bash
> export J3270_DIR=/path/to/j3270
> ```
> or via Gradle property:
> ```bash
> ./gradlew assembleDebug -Pj3270Dir=/path/to/j3270
> ```
### 2. Build the Debug APK
You can build using the helper script:
```bash
./build.sh
```
Or directly with Gradle Wrapper:
```bash
./gradlew assembleDebug
```
The compiled APK will be generated at:
```
build/outputs/apk/debug/a3270-debug.apk
```
## Deployment / Installation
To install the debug APK onto a connected Android device or emulator via `adb`:
```bash
adb install -r build/outputs/apk/debug/a3270-debug.apk
```
## Contributing
Contributions are welcome!
I have contributed no code to this project, it was entirely written by LLMs with my guidance only.
## Acknowledgements
- [j3270](https://git.hugfreevikings.wtf/rudi/j3270)
- [x3270](https://x3270.miraheze.org/wiki/Main_Page)
- [Antigravity](https://antigravity.google)
- Claude Opus 4.6
- Gemini 3.1 Pro (High)
- Gemini 3.7 Flash (High)
build.gradle
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plugins {
id 'com.android.application'
id 'org.jetbrains.kotlin.android'
id 'com.android.application' version '8.2.2'
id 'org.jetbrains.kotlin.android' version '1.9.22'
}
android {
@@ -39,6 +39,16 @@ android {
}
}
if (findProject(':lib3270j') != null) {
project(':lib3270j') {
apply plugin: 'java-library'
java {
sourceCompatibility = JavaVersion.VERSION_11
targetCompatibility = JavaVersion.VERSION_11
}
}
}
dependencies {
implementation project(':lib3270j')
build.sh
Executable
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#!/bin/bash
set -e
SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
cd "$SCRIPT_DIR"
echo "=== Building a3270 (Android APK) ==="
# Set up JAVA_HOME if not already set
if [ -z "$JAVA_HOME" ]; then
if [ -d "/Users/rudi/.sdkman/candidates/java/21.0.6-sem" ]; then
export JAVA_HOME="/Users/rudi/.sdkman/candidates/java/21.0.6-sem"
elif [ -d "/Users/rudi/.sdkman/candidates/java/current" ]; then
export JAVA_HOME="/Users/rudi/.sdkman/candidates/java/current"
fi
fi
# Set up ANDROID_HOME if not already set
if [ -z "$ANDROID_HOME" ]; then
if [ -d "$HOME/Library/Android/sdk" ]; then
export ANDROID_HOME="$HOME/Library/Android/sdk"
fi
fi
if [ -n "$JAVA_HOME" ]; then
echo "Using JAVA_HOME: $JAVA_HOME"
fi
if [ -n "$ANDROID_HOME" ]; then
echo "Using ANDROID_HOME: $ANDROID_HOME"
fi
# Check for j3270 / lib3270j
J3270_PATH="${J3270_DIR:-$SCRIPT_DIR/../j3270}"
if [ ! -d "$J3270_PATH/lib3270j" ]; then
echo "ERROR: lib3270j not found at $J3270_PATH/lib3270j"
echo "Please ensure the j3270 repository is cloned alongside a3270:"
echo " git clone https://git.hugfreevikings.wtf/rudi/j3270.git"
echo "Or set the J3270_DIR environment variable:"
echo " export J3270_DIR=/path/to/j3270"
exit 1
fi
echo "Building debug APK..."
./gradlew assembleDebug --no-daemon
APK_PATH="$SCRIPT_DIR/build/outputs/apk/debug/a3270-debug.apk"
if [ -f "$APK_PATH" ]; then
echo "=== Build Complete ==="
echo "APK created at: $APK_PATH"
ls -lh "$APK_PATH"
else
echo "Build completed, but APK not found at $APK_PATH"
fi
gradle.properties
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android.useAndroidX=true
org.gradle.jvmargs=-Xmx2048m -XX:MaxMetaspaceSize=512m
gradle/wrapper/gradle-wrapper.jar
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gradle/wrapper/gradle-wrapper.properties
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distributionBase=GRADLE_USER_HOME
distributionPath=wrapper/dists
distributionUrl=https\://services.gradle.org/distributions/gradle-8.5-bin.zip
networkTimeout=10000
validateDistributionUrl=true
zipStoreBase=GRADLE_USER_HOME
zipStorePath=wrapper/dists
gradlew
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#!/bin/sh
#
# Copyright © 2015-2021 the original authors.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# https://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
##############################################################################
#
# Gradle start up script for POSIX generated by Gradle.
#
# Important for running:
#
# (1) You need a POSIX-compliant shell to run this script. If your /bin/sh is
# noncompliant, but you have some other compliant shell such as ksh or
# bash, then to run this script, type that shell name before the whole
# command line, like:
#
# ksh Gradle
#
# Busybox and similar reduced shells will NOT work, because this script
# requires all of these POSIX shell features:
# * functions;
# * expansions «$var», «${var}», «${var:-default}», «${var+SET}»,
# «${var#prefix}», «${var%suffix}», and «$( cmd )»;
# * compound commands having a testable exit status, especially «case»;
# * various built-in commands including «command», «set», and «ulimit».
#
# Important for patching:
#
# (2) This script targets any POSIX shell, so it avoids extensions provided
# by Bash, Ksh, etc; in particular arrays are avoided.
#
# The "traditional" practice of packing multiple parameters into a
# space-separated string is a well documented source of bugs and security
# problems, so this is (mostly) avoided, by progressively accumulating
# options in "$@", and eventually passing that to Java.
#
# Where the inherited environment variables (DEFAULT_JVM_OPTS, JAVA_OPTS,
# and GRADLE_OPTS) rely on word-splitting, this is performed explicitly;
# see the in-line comments for details.
#
# There are tweaks for specific operating systems such as AIX, CygWin,
# Darwin, MinGW, and NonStop.
#
# (3) This script is generated from the Groovy template
# https://github.com/gradle/gradle/blob/HEAD/subprojects/plugins/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt
# within the Gradle project.
#
# You can find Gradle at https://github.com/gradle/gradle/.
#
##############################################################################
# Attempt to set APP_HOME
# Resolve links: $0 may be a link
app_path=$0
# Need this for daisy-chained symlinks.
while
APP_HOME=${app_path%"${app_path##*/}"} # leaves a trailing /; empty if no leading path
[ -h "$app_path" ]
do
ls=$( ls -ld "$app_path" )
link=${ls#*' -> '}
case $link in #(
/*) app_path=$link ;; #(
*) app_path=$APP_HOME$link ;;
esac
done
# This is normally unused
# shellcheck disable=SC2034
APP_BASE_NAME=${0##*/}
# Discard cd standard output in case $CDPATH is set (https://github.com/gradle/gradle/issues/25036)
APP_HOME=$( cd "${APP_HOME:-./}" > /dev/null && pwd -P ) || exit
# Use the maximum available, or set MAX_FD != -1 to use that value.
MAX_FD=maximum
warn () {
echo "$*"
} >&2
die () {
echo
echo "$*"
echo
exit 1
} >&2
# OS specific support (must be 'true' or 'false').
cygwin=false
msys=false
darwin=false
nonstop=false
case "$( uname )" in #(
CYGWIN* ) cygwin=true ;; #(
Darwin* ) darwin=true ;; #(
MSYS* | MINGW* ) msys=true ;; #(
NONSTOP* ) nonstop=true ;;
esac
CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
# Determine the Java command to use to start the JVM.
if [ -n "$JAVA_HOME" ] ; then
if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
# IBM's JDK on AIX uses strange locations for the executables
JAVACMD=$JAVA_HOME/jre/sh/java
else
JAVACMD=$JAVA_HOME/bin/java
fi
if [ ! -x "$JAVACMD" ] ; then
die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
Please set the JAVA_HOME variable in your environment to match the
location of your Java installation."
fi
else
JAVACMD=java
if ! command -v java >/dev/null 2>&1
then
die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
Please set the JAVA_HOME variable in your environment to match the
location of your Java installation."
fi
fi
# Increase the maximum file descriptors if we can.
if ! "$cygwin" && ! "$darwin" && ! "$nonstop" ; then
case $MAX_FD in #(
max*)
# In POSIX sh, ulimit -H is undefined. That's why the result is checked to see if it worked.
# shellcheck disable=SC2039,SC3045
MAX_FD=$( ulimit -H -n ) ||
warn "Could not query maximum file descriptor limit"
esac
case $MAX_FD in #(
'' | soft) :;; #(
*)
# In POSIX sh, ulimit -n is undefined. That's why the result is checked to see if it worked.
# shellcheck disable=SC2039,SC3045
ulimit -n "$MAX_FD" ||
warn "Could not set maximum file descriptor limit to $MAX_FD"
esac
fi
# Collect all arguments for the java command, stacking in reverse order:
# * args from the command line
# * the main class name
# * -classpath
# * -D...appname settings
# * --module-path (only if needed)
# * DEFAULT_JVM_OPTS, JAVA_OPTS, and GRADLE_OPTS environment variables.
# For Cygwin or MSYS, switch paths to Windows format before running java
if "$cygwin" || "$msys" ; then
APP_HOME=$( cygpath --path --mixed "$APP_HOME" )
CLASSPATH=$( cygpath --path --mixed "$CLASSPATH" )
JAVACMD=$( cygpath --unix "$JAVACMD" )
# Now convert the arguments - kludge to limit ourselves to /bin/sh
for arg do
if
case $arg in #(
-*) false ;; # don't mess with options #(
/?*) t=${arg#/} t=/${t%%/*} # looks like a POSIX filepath
[ -e "$t" ] ;; #(
*) false ;;
esac
then
arg=$( cygpath --path --ignore --mixed "$arg" )
fi
# Roll the args list around exactly as many times as the number of
# args, so each arg winds up back in the position where it started, but
# possibly modified.
#
# NB: a `for` loop captures its iteration list before it begins, so
# changing the positional parameters here affects neither the number of
# iterations, nor the values presented in `arg`.
shift # remove old arg
set -- "$@" "$arg" # push replacement arg
done
fi
# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
# Collect all arguments for the java command:
# * DEFAULT_JVM_OPTS, JAVA_OPTS, JAVA_OPTS, and optsEnvironmentVar are not allowed to contain shell fragments,
# and any embedded shellness will be escaped.
# * For example: A user cannot expect ${Hostname} to be expanded, as it is an environment variable and will be
# treated as '${Hostname}' itself on the command line.
set -- \
"-Dorg.gradle.appname=$APP_BASE_NAME" \
-classpath "$CLASSPATH" \
org.gradle.wrapper.GradleWrapperMain \
"$@"
# Stop when "xargs" is not available.
if ! command -v xargs >/dev/null 2>&1
then
die "xargs is not available"
fi
# Use "xargs" to parse quoted args.
#
# With -n1 it outputs one arg per line, with the quotes and backslashes removed.
#
# In Bash we could simply go:
#
# readarray ARGS < <( xargs -n1 <<<"$var" ) &&
# set -- "${ARGS[@]}" "$@"
#
# but POSIX shell has neither arrays nor command substitution, so instead we
# post-process each arg (as a line of input to sed) to backslash-escape any
# character that might be a shell metacharacter, then use eval to reverse
# that process (while maintaining the separation between arguments), and wrap
# the whole thing up as a single "set" statement.
#
# This will of course break if any of these variables contains a newline or
# an unmatched quote.
#
eval "set -- $(
printf '%s\n' "$DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS" |
xargs -n1 |
sed ' s~[^-[:alnum:]+,./:=@_]~\\&~g; ' |
tr '\n' ' '
)" '"$@"'
exec "$JAVACMD" "$@"
gradlew.bat
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@rem
@rem Copyright 2015 the original author or authors.
@rem
@rem Licensed under the Apache License, Version 2.0 (the "License");
@rem you may not use this file except in compliance with the License.
@rem You may obtain a copy of the License at
@rem
@rem https://www.apache.org/licenses/LICENSE-2.0
@rem
@rem Unless required by applicable law or agreed to in writing, software
@rem distributed under the License is distributed on an "AS IS" BASIS,
@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
@rem See the License for the specific language governing permissions and
@rem limitations under the License.
@rem
@if "%DEBUG%"=="" @echo off
@rem ##########################################################################
@rem
@rem Gradle startup script for Windows
@rem
@rem ##########################################################################
@rem Set local scope for the variables with windows NT shell
if "%OS%"=="Windows_NT" setlocal
set DIRNAME=%~dp0
if "%DIRNAME%"=="" set DIRNAME=.
@rem This is normally unused
set APP_BASE_NAME=%~n0
set APP_HOME=%DIRNAME%
@rem Resolve any "." and ".." in APP_HOME to make it shorter.
for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
@rem Find java.exe
if defined JAVA_HOME goto findJavaFromJavaHome
set JAVA_EXE=java.exe
%JAVA_EXE% -version >NUL 2>&1
if %ERRORLEVEL% equ 0 goto execute
echo.
echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
echo.
echo Please set the JAVA_HOME variable in your environment to match the
echo location of your Java installation.
goto fail
:findJavaFromJavaHome
set JAVA_HOME=%JAVA_HOME:"=%
set JAVA_EXE=%JAVA_HOME%/bin/java.exe
if exist "%JAVA_EXE%" goto execute
echo.
echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
echo.
echo Please set the JAVA_HOME variable in your environment to match the
echo location of your Java installation.
goto fail
:execute
@rem Setup the command line
set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
@rem Execute Gradle
"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %*
:end
@rem End local scope for the variables with windows NT shell
if %ERRORLEVEL% equ 0 goto mainEnd
:fail
rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
rem the _cmd.exe /c_ return code!
set EXIT_CODE=%ERRORLEVEL%
if %EXIT_CODE% equ 0 set EXIT_CODE=1
if not ""=="%GRADLE_EXIT_CONSOLE%" exit %EXIT_CODE%
exit /b %EXIT_CODE%
:mainEnd
if "%OS%"=="Windows_NT" endlocal
:omega
settings.gradle
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pluginManagement {
repositories {
google {
content {
includeGroupByRegex("com\\.android.*")
includeGroupByRegex("com\\.google.*")
includeGroupByRegex("androidx.*")
}
}
mavenCentral()
gradlePluginPortal()
}
}
dependencyResolutionManagement {
repositoriesMode.set(RepositoriesMode.PREFER_PROJECT)
repositories {
google()
mavenCentral()
}
}
rootProject.name = 'a3270'
// Resolve lib3270j from sibling j3270 repo or configured path
def j3270Path = hasProperty('j3270Dir') ? property('j3270Dir') : (System.getenv('J3270_DIR') ?: '../j3270')
def lib3270jDir = file("${j3270Path}/lib3270j")
if (lib3270jDir.exists()) {
include ':lib3270j'
project(':lib3270j').projectDir = lib3270jDir
} else {
logger.warn("WARNING: lib3270j not found at '${lib3270jDir.absolutePath}'. Please clone j3270 next to a3270 or set J3270_DIR.")
}