Can now build to android apk

Need to fix: - Remove default android header bar - Fix rcss styling to work on small screens
2026-08-09 00:16:23 -05:00
parent 4aa23d3670
commit a3c7d9cf75
13 changed files with 668 additions and 7 deletions
--- a/android/.gitignore
+++ b/android/.gitignore
@@ -0,0 +1,3 @@
+.gradle
+build
+app/.cxx
--- a/android/app/CMakeLists.txt
+++ b/android/app/CMakeLists.txt
@@ -0,0 +1,138 @@
+cmake_minimum_required(VERSION 3.22.1)
+project(critterfolio_android LANGUAGES C CXX)
+
+set(CMAKE_CXX_STANDARD 17)
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
+
+include(ExternalProject)
+
+set(DEPS_INSTALL ${CMAKE_BINARY_DIR}/deps/install)
+
+# ExternalProject_Add spawns a completely separate CMake invocation for each
+# dependency, so none of AGP's Android toolchain settings carry over
+# automatically - we have to forward them explicitly to every sub-build.
+set(ANDROID_TOOLCHAIN_ARGS
+  -DCMAKE_TOOLCHAIN_FILE=${CMAKE_TOOLCHAIN_FILE}
+  -DANDROID_ABI=${ANDROID_ABI}
+  -DANDROID_PLATFORM=${ANDROID_PLATFORM}
+  -DANDROID_STL=c++_shared
+  -DCMAKE_BUILD_TYPE=Release
+  -DCMAKE_INSTALL_PREFIX=${DEPS_INSTALL}
+  -DCMAKE_PREFIX_PATH=${DEPS_INSTALL}
+  -DBUILD_SHARED_LIBS=OFF
+  -DCMAKE_CXX_STANDARD=17
+  -DCMAKE_CXX_STANDARD_REQUIRED=ON
+  -DCMAKE_FIND_ROOT_PATH_MODE_PACKAGE=BOTH
+  -DCMAKE_FIND_ROOT_PATH_MODE_LIBRARY=BOTH
+  -DCMAKE_FIND_ROOT_PATH_MODE_INCLUDE=BOTH
+)
+
+find_package(SDL3 REQUIRED CONFIG)
+find_package(SDL3_image REQUIRED CONFIG)
+
+ExternalProject_Add(freetype_ext
+  GIT_REPOSITORY https://github.com/freetype/freetype.git
+  GIT_TAG VER-2-13-3
+  CMAKE_ARGS ${ANDROID_TOOLCHAIN_ARGS}
+    -DFT_DISABLE_ZLIB=TRUE
+    -DFT_DISABLE_BZIP2=TRUE
+    -DFT_DISABLE_PNG=TRUE
+    -DFT_DISABLE_HARFBUZZ=TRUE
+    -DFT_DISABLE_BROTLI=TRUE
+)
+
+ExternalProject_Add(lunasvg_ext
+  GIT_REPOSITORY https://github.com/sammycage/lunasvg.git
+  GIT_TAG v3.2.1
+  CMAKE_ARGS ${ANDROID_TOOLCHAIN_ARGS}
+  DEPENDS freetype_ext
+)
+
+# Lua ships no official CMakeLists, and we don't want its standalone lua/luac
+# CLI targets (those need readline). We compile just the library sources.
+ExternalProject_Add(lua_ext
+  GIT_REPOSITORY https://github.com/lua/lua.git
+  GIT_TAG v5.4.8
+  CONFIGURE_COMMAND ""
+  BUILD_IN_SOURCE 1
+  BUILD_COMMAND sh -c "${CMAKE_C_COMPILER} --target=${CMAKE_C_COMPILER_TARGET} --sysroot=${CMAKE_SYSROOT} -c -O2 -fPIC -DLUA_USE_POSIX $(ls *.c | grep -v -e '^lua.c$' -e '^luac.c$') && ${CMAKE_AR} rcs liblua.a *.o"
+  INSTALL_COMMAND ${CMAKE_COMMAND} -E make_directory ${DEPS_INSTALL}/lib ${DEPS_INSTALL}/include
+    COMMAND ${CMAKE_COMMAND} -E copy liblua.a ${DEPS_INSTALL}/lib/
+    COMMAND ${CMAKE_COMMAND} -E copy lua.h lauxlib.h lualib.h luaconf.h ${DEPS_INSTALL}/include/
+)
+
+ExternalProject_Add(sqlitecpp_ext
+  GIT_REPOSITORY https://github.com/SRombauts/SQLiteCpp.git
+  GIT_TAG 3.3.3
+  CMAKE_ARGS ${ANDROID_TOOLCHAIN_ARGS}
+    -DSQLITECPP_INTERNAL_SQLITE=ON
+    -DSQLITECPP_RUN_CPPLINT=OFF
+    -DSQLITECPP_RUN_CPPCHECK=OFF
+)
+
+ExternalProject_Add(toml11_ext
+  GIT_REPOSITORY https://github.com/ToruNiina/toml11.git
+  GIT_TAG v3.8.1
+  CMAKE_ARGS ${ANDROID_TOOLCHAIN_ARGS}
+)
+
+ExternalProject_Add(rmlui_ext
+  GIT_REPOSITORY https://github.com/mikke89/RmlUi.git
+  GIT_TAG master
+  CMAKE_ARGS ${ANDROID_TOOLCHAIN_ARGS}
+    -DFreetype_ROOT=${DEPS_INSTALL}
+    -DRMLUI_LUA_BINDINGS=ON
+    -DRMLUI_LUA_BINDINGS_LIBRARY=lua
+    -DRMLUI_SVG_PLUGIN=ON
+    -DRMLUI_SAMPLES=OFF
+    -DBUILD_TESTING=OFF
+  DEPENDS freetype_ext lunasvg_ext lua_ext
+)
+
+set(PROJECT_SRC_DIR ${CMAKE_SOURCE_DIR}/../../src)
+set(RMLUI_BACKEND_DIR ${CMAKE_SOURCE_DIR}/../../vendor/rmlui_backend)
+
+add_library(critterfolio SHARED
+  ${PROJECT_SRC_DIR}/main.cpp
+  ${PROJECT_SRC_DIR}/database.cpp
+  ${PROJECT_SRC_DIR}/ui.cpp
+  ${PROJECT_SRC_DIR}/image_utils.cpp
+  ${RMLUI_BACKEND_DIR}/RmlUi_Backend_SDL_SDLrenderer.cpp
+  ${RMLUI_BACKEND_DIR}/RmlUi_Platform_SDL.cpp
+  ${RMLUI_BACKEND_DIR}/RmlUi_Renderer_SDL.cpp
+)
+
+add_dependencies(critterfolio freetype_ext lunasvg_ext lua_ext sqlitecpp_ext toml11_ext rmlui_ext)
+
+target_include_directories(critterfolio PRIVATE
+  ${PROJECT_SRC_DIR}
+  ${RMLUI_BACKEND_DIR}
+  ${DEPS_INSTALL}/include
+)
+
+target_compile_definitions(critterfolio PRIVATE
+  RMLUI_SDL_VERSION_MAJOR=3
+  RMLUI_STATIC_LIB
+)
+
+# Linked by explicit path rather than find_package(), since find_package()
+# runs during THIS configure pass - before any ExternalProject_Add step
+# above has actually built or installed anything (those only run later,
+# during the actual build). This is what the superbuild pattern is for.
+target_link_directories(critterfolio PRIVATE ${DEPS_INSTALL}/lib)
+
+target_link_libraries(critterfolio PRIVATE
+  SDL3::SDL3
+  SDL3_image::SDL3_image
+  rmlui
+  rmlui_debugger
+  rmlui_lua
+  lua
+  freetype
+  lunasvg
+  plutovg
+  SQLiteCpp
+  sqlite3
+)
+
+target_link_options(critterfolio PRIVATE "-Wl,-u,SDL_main")
--- a/android/buildlog.txt
+++ b/android/buildlog.txt
@@ -0,0 +1,47 @@
+> Task :app:preBuild UP-TO-DATE
+> Task :app:preDebugBuild UP-TO-DATE
+> Task :app:mergeDebugNativeDebugMetadata NO-SOURCE
+> Task :app:javaPreCompileDebug UP-TO-DATE
+> Task :app:checkDebugAarMetadata UP-TO-DATE
+> Task :app:generateDebugResValues UP-TO-DATE
+> Task :app:mapDebugSourceSetPaths UP-TO-DATE
+> Task :app:generateDebugResources UP-TO-DATE
+> Task :app:mergeDebugResources UP-TO-DATE
+> Task :app:packageDebugResources UP-TO-DATE
+> Task :app:parseDebugLocalResources UP-TO-DATE
+> Task :app:createDebugCompatibleScreenManifests UP-TO-DATE
+> Task :app:extractDeepLinksDebug UP-TO-DATE
+> Task :app:processDebugMainManifest UP-TO-DATE
+> Task :app:processDebugManifest UP-TO-DATE
+> Task :app:processDebugManifestForPackage UP-TO-DATE
+> Task :app:processDebugResources UP-TO-DATE
+> Task :app:compileDebugJavaWithJavac UP-TO-DATE
+> Task :app:mergeDebugShaders UP-TO-DATE
+> Task :app:compileDebugShaders NO-SOURCE
+> Task :app:generateDebugAssets UP-TO-DATE
+> Task :app:mergeDebugAssets UP-TO-DATE
+> Task :app:compressDebugAssets UP-TO-DATE
+> Task :app:desugarDebugFileDependencies UP-TO-DATE
+> Task :app:dexBuilderDebug UP-TO-DATE
+> Task :app:mergeDebugGlobalSynthetics UP-TO-DATE
+> Task :app:processDebugJavaRes NO-SOURCE
+> Task :app:mergeDebugJavaResource UP-TO-DATE
+> Task :app:checkDebugDuplicateClasses UP-TO-DATE
+> Task :app:mergeDebugStartupProfile UP-TO-DATE
+> Task :app:mergeExtDexDebug UP-TO-DATE
+> Task :app:mergeLibDexDebug UP-TO-DATE
+> Task :app:mergeProjectDexDebug UP-TO-DATE
+> Task :app:configureCMakeDebug[arm64-v8a]
+> Task :app:buildCMakeDebug[arm64-v8a]
+> Task :app:mergeDebugJniLibFolders UP-TO-DATE
+> Task :app:validateSigningDebug UP-TO-DATE
+> Task :app:writeDebugAppMetadata UP-TO-DATE
+> Task :app:writeDebugSigningConfigVersions UP-TO-DATE
+> Task :app:mergeDebugNativeLibs
+> Task :app:stripDebugDebugSymbols
+> Task :app:packageDebug
+> Task :app:createDebugApkListingFileRedirect UP-TO-DATE
+> Task :app:assembleDebug
+
+BUILD SUCCESSFUL in 9s
+37 actionable tasks: 5 executed, 32 up-to-date
--- a/android/gradle/wrapper/gradle-wrapper.jar
+++ b/android/gradle/wrapper/gradle-wrapper.jar
--- a/android/gradle/wrapper/gradle-wrapper.properties
+++ b/android/gradle/wrapper/gradle-wrapper.properties
@@ -0,0 +1,7 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.7-bin.zip
+networkTimeout=10000
+validateDistributionUrl=true
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists
--- a/android/gradlew
+++ b/android/gradlew
@@ -0,0 +1,251 @@
+#!/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.
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+
+##############################################################################
+#
+#   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/platforms/jvm/plugins-application/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 -P "${APP_HOME:-./}" > /dev/null && printf '%s\n' "$PWD" ) || 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 "$( uname )" in                #(
+  CYGWIN* )         cygwin=true  ;; #(
+  Darwin* )         darwin=true  ;; #(
+  MSYS* | MINGW* )  msys=true    ;; #(
+  NONSTOP* )        nonstop=true ;;
+esac
+
+CLASSPATH="\\\"\\\""
+
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$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, 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" \
+        -jar "$APP_HOME/gradle/wrapper/gradle-wrapper.jar" \
+        "$@"
+
+# 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 "$JAVACMD" "$@"
--- a/android/gradlew.bat
+++ b/android/gradlew.bat
@@ -0,0 +1,94 @@
+@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
+@rem SPDX-License-Identifier: Apache-2.0
+@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. 1>&2
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH. 1>&2
+echo. 1>&2
+echo Please set the JAVA_HOME variable in your environment to match the 1>&2
+echo location of your Java installation. 1>&2
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto execute
+
+echo. 1>&2
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME% 1>&2
+echo. 1>&2
+echo Please set the JAVA_HOME variable in your environment to match the 1>&2
+echo location of your Java installation. 1>&2
+
+goto fail
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=
+
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" -jar "%APP_HOME%\gradle\wrapper\gradle-wrapper.jar" %*
+
+: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
--- a/flake.nix
+++ b/flake.nix
@@ -80,6 +80,7 @@
          buildToolsVersions = [ "34.0.0" ];
          includeNDK = true;
          ndkVersions = [ ndkVersion ];
+          cmakeVersions = [ "3.22.1" ];
          abiVersions = [ "arm64-v8a" ];
          includeEmulator = false;
        };
--- a/src/asset_io.hpp
+++ b/src/asset_io.hpp
@@ -0,0 +1,16 @@
+#pragma once
+
+#include <SDL3/SDL.h>
+#include <string>
+
+inline SDL_IOStream *OpenAssetFile(const std::string &virtual_path) {
+    std::string resolved = virtual_path;
+#if defined(__ANDROID__)
+    if (resolved.rfind("./assets/", 0) == 0) {
+        resolved = resolved.substr(9);
+    } else if (resolved.rfind("assets/", 0) == 0) {
+        resolved = resolved.substr(7);
+    }
+#endif
+    return SDL_IOFromFile(resolved.c_str(), "rb");
+}
--- a/src/database.cpp
+++ b/src/database.cpp
@@ -1,10 +1,68 @@
 #include "database.hpp"
+#include "asset_io.hpp"
 #include <SQLiteCpp/Database.h>
+#include <SDL3/SDL.h>
 #include <iostream>
+#include <vector>
+
+std::string get_writable_db_path() {
+    char *pref = SDL_GetPrefPath("Critterfolio", "CritterFolio");
+    std::string path = pref ? pref : "./";
+    if (pref) {
+        SDL_free(pref);
+    }
+    path += "local.db";
+    return path;
+}
+
+bool ensure_db_copied() {
+    std::string dest_path = get_writable_db_path();
+
+    SDL_IOStream *check = SDL_IOFromFile(dest_path.c_str(), "rb");
+    if (check) {
+        SDL_CloseIO(check);
+        return true;
+    }
+
+    SDL_IOStream *src = OpenAssetFile("./assets/local.db");
+    if (!src) {
+        std::cout << "[ERROR] Could not open seed database in assets: " << SDL_GetError() << "\n";
+        return false;
+    }
+
+    Sint64 size = SDL_GetIOSize(src);
+    if (size < 0) {
+        std::cout << "[ERROR] Could not determine seed database size.\n";
+        SDL_CloseIO(src);
+        return false;
+    }
+
+    std::vector<Uint8> buffer(static_cast<size_t>(size));
+    if (SDL_ReadIO(src, buffer.data(), buffer.size()) != buffer.size()) {
+        std::cout << "[ERROR] Failed reading seed database.\n";
+        SDL_CloseIO(src);
+        return false;
+    }
+    SDL_CloseIO(src);
+
+    SDL_IOStream *dst = SDL_IOFromFile(dest_path.c_str(), "wb");
+    if (!dst) {
+        std::cout << "[ERROR] Could not open destination database for writing: " << SDL_GetError() << "\n";
+        return false;
+    }
+
+    bool ok = SDL_WriteIO(dst, buffer.data(), buffer.size()) == buffer.size();
+    SDL_CloseIO(dst);
+
+    if (!ok) {
+        std::cout << "[ERROR] Failed writing copied database.\n";
+    }
+    return ok;
+}

 bool db_get_all_critters(std::map<int, Critter> &critters) {
    try {
-        SQLite::Database db("./assets/local.db", SQLite::OPEN_READWRITE | SQLite::OPEN_CREATE);
+        SQLite::Database db(get_writable_db_path(), SQLite::OPEN_READWRITE | SQLite::OPEN_CREATE);
        SQLite::Statement q(db, "SELECT * FROM critters");

        critters.clear();
@@ -34,7 +92,7 @@ bool db_get_all_critters(std::map<int, Critter> &critters) {

 bool db_add_critter(const Critter &c, int &out_id) {
    try {
-        SQLite::Database db("./assets/local.db", SQLite::OPEN_READWRITE);
+        SQLite::Database db(get_writable_db_path(), SQLite::OPEN_READWRITE);
        SQLite::Statement q(db, "INSERT INTO critters (name, gender, mother_id, father_id, notes, species) VALUES (?, ?, ?, ?, ?, ?)");

        q.bind(1, c.name);
@@ -56,7 +114,7 @@ bool db_add_critter(const Critter &c, int &out_id) {

 bool db_delete_critter(int id) {
    try {
-        SQLite::Database db("./assets/local.db", SQLite::OPEN_READWRITE);
+        SQLite::Database db(get_writable_db_path(), SQLite::OPEN_READWRITE);
        SQLite::Statement q(db, "DELETE FROM critters WHERE id = ?");
        q.bind(1, id);
        q.exec();
--- a/src/database.hpp
+++ b/src/database.hpp
@@ -4,6 +4,8 @@
 #include <map>
 #include <string>

+std::string get_writable_db_path();
+bool ensure_db_copied();
 bool db_get_all_critters(std::map<int, Critter> &critters);
 bool db_add_critter(const Critter &c, int &out_id);
 bool db_delete_critter(int id);
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -1,9 +1,11 @@
 #include "critter.hpp"
 #include "database.hpp"
 #include "ui.hpp"
+#include "sdl_file_interface.hpp"
 #include "../vendor/stb/stb_image.h"
 #include "../vendor/stb/stb_image_write.h"
 #include <SDL3/SDL.h>
+#include <SDL3/SDL_main.h>
 #include <RmlUi/Core.h>
 #include <RmlUi/Core/Core.h>
 #include <RmlUi/Debugger/Debugger.h>
@@ -19,6 +21,7 @@ static std::map<int, Critter> critters;
 static std::vector<CritterEntry> critter_list;
 static Rml::ElementDocument *doc;
 static AppData app_data;
+static SDLFileInterface file_interface;
 void shutdown() {
    Rml::Shutdown();
    Backend::Shutdown();
@@ -36,8 +39,14 @@ bool initialize() {
    std::cout << "[INFO] RmlUI Backend initialized.\n";
    Rml::SetSystemInterface(Backend::GetSystemInterface());
    Rml::SetRenderInterface(Backend::GetRenderInterface());
+    Rml::SetFileInterface(&file_interface);
    Rml::Initialise();
    Rml::Lua::Initialise();
+    std::cout << "[INFO] Preparing local DB...\n";
+    if (!ensure_db_copied()) {
+        std::cout << "[ERROR] Could not prepare local DB.\n";
+        return false;
+    }
    std::cout << "[INFO] Loading local DB...\n";
    if (!db_get_all_critters(critters)) {
        std::cout << "[ERROR] Local DB failed to initialize.\n";
@@ -83,7 +92,6 @@ bool f8_was_pressed = false;
 void handle_input() {
    const bool *state = SDL_GetKeyboardState(NULL);
    if (state) {
-        // Reload ui
        bool f5_state = state[SDL_SCANCODE_F5];
        if (f5_state && !f5_was_pressed) {
            f5_was_pressed = true;
@@ -91,7 +99,6 @@ void handle_input() {
        } else if (!f5_state) {
            f5_was_pressed = false;
        }
-        // Toggle debugger window
        bool f8_state = state[SDL_SCANCODE_F8];
        if (f8_state && !f8_was_pressed) {
            f8_was_pressed = true;
@@ -102,7 +109,7 @@ void handle_input() {
        }
    }
 }
-int main() {
+int main(int arc, char *argv[]) {
    std::cout << "[INFO] Starting CritterFolio...\n";
    is_initalized = initialize();
    if (!is_initalized) {
--- a/src/sdl_file_interface.hpp
+++ b/src/sdl_file_interface.hpp
@@ -0,0 +1,37 @@
+#pragma once
+
+#include "asset_io.hpp"
+#include <RmlUi/Core/FileInterface.h>
+#include <SDL3/SDL.h>
+
+class SDLFileInterface : public Rml::FileInterface {
+public:
+    Rml::FileHandle Open(const Rml::String &path) override {
+        SDL_IOStream *io = OpenAssetFile(path);
+        return reinterpret_cast<Rml::FileHandle>(io);
+    }
+
+    void Close(Rml::FileHandle file) override {
+        SDL_CloseIO(reinterpret_cast<SDL_IOStream *>(file));
+    }
+
+    size_t Read(void *buffer, size_t size, Rml::FileHandle file) override {
+        return SDL_ReadIO(reinterpret_cast<SDL_IOStream *>(file), buffer, size);
+    }
+
+    bool Seek(Rml::FileHandle file, long offset, int origin) override {
+        SDL_IOWhence whence = SDL_IO_SEEK_SET;
+        if (origin == SEEK_CUR) whence = SDL_IO_SEEK_CUR;
+        else if (origin == SEEK_END) whence = SDL_IO_SEEK_END;
+
+        return SDL_SeekIO(reinterpret_cast<SDL_IOStream *>(file), offset, whence) >= 0;
+    }
+
+    size_t Tell(Rml::FileHandle file) override {
+        return static_cast<size_t>(SDL_TellIO(reinterpret_cast<SDL_IOStream *>(file)));
+    }
+
+    size_t Length(Rml::FileHandle file) override {
+        return static_cast<size_t>(SDL_GetIOSize(reinterpret_cast<SDL_IOStream *>(file)));
+    }
+};