baldav/src-tauri/gen/android/app/build.gradle.kts
4aiman a52e998fb6 BRouter: analysis + embed the offline routing engine (Stage 1)
Analysis in docs/brouter-findings.md: how BRouter knows roads (.rd5
segments), routes and reaches low elevation gain (profile uphill/downhill
cost + kinematics), the three call surfaces, and an evaluation of two ideas
— fill GPS gaps along roads, and offline waypoint route planning. License is
MIT; the engine has no desktop-only deps, so it embeds on Android ART.

Stage 1 (embed + bridge, compiles into the apk; on-device route not yet run):
- vendored brouter-1.6.3-all.jar into the Android module (dexes cleanly) and
  bundled the trekking/shortest profiles + lookups.dat as assets, copied to
  files/brouter/profiles2 on launch
- MainActivity: a brouter_command.txt handler on the existing FileObserver
  runs btools.router.RoutingEngine off the UI thread (recipe taken via javap
  from ServerHandler) and returns the track as GPX
- Rust brouter_route command: same file bridge as GPS (request + command,
  poll for the result), registered in the invoke handler
- frontend/js/router.js: BRouter.route(points, profile) -> GPX (parseRouteGPX)
- LICENSE-brouter (MIT notice) kept alongside the vendored engine

Segments (.rd5, ~13-23 MB per 5x5 tile) are delivered later (Stage 2, wired
download inside BalDav). IMPLEMENTATION_PLAN.md tracks the 5 stages.
2026-09-09 00:56:13 +03:00

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Kotlin

import java.util.Properties
plugins {
id("com.android.application")
id("org.jetbrains.kotlin.android")
id("rust")
}
val tauriProperties = Properties().apply {
val propFile = file("tauri.properties")
if (propFile.exists()) {
propFile.inputStream().use { load(it) }
}
}
android {
compileSdk = 36
namespace = "dev.baldav.app"
defaultConfig {
manifestPlaceholders["usesCleartextTraffic"] = "false"
applicationId = "dev.baldav.app"
minSdk = 24
targetSdk = 36
versionCode = tauriProperties.getProperty("tauri.android.versionCode", "1").toInt()
versionName = tauriProperties.getProperty("tauri.android.versionName", "1.0")
}
buildTypes {
getByName("debug") {
manifestPlaceholders["usesCleartextTraffic"] = "true"
isDebuggable = true
isJniDebuggable = true
isMinifyEnabled = false
packaging { jniLibs.keepDebugSymbols.add("*/arm64-v8a/*.so")
jniLibs.keepDebugSymbols.add("*/armeabi-v7a/*.so")
jniLibs.keepDebugSymbols.add("*/x86/*.so")
jniLibs.keepDebugSymbols.add("*/x86_64/*.so")
}
}
getByName("release") {
isMinifyEnabled = true
proguardFiles(
*fileTree(".") { include("**/*.pro") }
.plus(getDefaultProguardFile("proguard-android-optimize.txt"))
.toList().toTypedArray()
)
}
}
kotlinOptions {
jvmTarget = "1.8"
}
buildFeatures {
buildConfig = true
}
}
rust {
rootDirRel = "../../../"
}
dependencies {
// BRouter offline routing engine (MIT, github.com/abrensch/brouter) — embedded so
// routes are computed on-device without network. Called in-process from Kotlin
// (btools.router.RoutingEngine). Segments (.rd5) live in app data dir; profiles in assets.
implementation(files("libs/brouter-1.6.3-all.jar"))
implementation("androidx.webkit:webkit:1.14.0")
implementation("androidx.appcompat:appcompat:1.7.1")
implementation("androidx.activity:activity-ktx:1.10.1")
implementation("com.google.android.material:material:1.12.0")
// Optional fused location provider (opt-in via settings). Guarded at runtime so
// the app still works if Google Play services are absent — see GpsRecorderService.
implementation("com.google.android.gms:play-services-location:21.3.0")
testImplementation("junit:junit:4.13.2")
androidTestImplementation("androidx.test.ext:junit:1.1.4")
androidTestImplementation("androidx.test.espresso:espresso-core:3.5.0")
}
apply(from = "tauri.build.gradle.kts")