gallery/harnesses/gtauri/gen/android/app/build.gradle.kts
Greg Pomerantz 58b203e4fa gtauri: event-driven watching + defense against stale VFS dir listings
Live watching is now event-driven, no tree polling:
- Android: MainActivity registers a MediaStore ContentObserver
  (Images, notifyForDescendants) and wakes the Rust watcher thread via
  a JNI call (Java_wow_gmp_gallery_MainActivity_nativeFsChange) — a
  single channel send, no main-thread work. Covers camera saves,
  media-scanner indexing, other apps' indexed writes.
- Desktop: inotify/FSEvents via notify on the scan roots.
- On wake: coalesce + debounce, diff dir mtimes, rescan only the
  changed subtrees. The 1 s recv timeout doubles as a cheap backstop
  (raw out-of-band copies the scanner hasn't indexed yet); a 5-minute
  full pass is the safety net. minSdk 30 (3-arg ContentObserver API).

Stale-listing truncation bug found and fixed (reproduced on the
emulator's 9p /sdcard; the phone's FUSE does the same): a readdir over
a large directory can return a SILENT early EOF — a stale cached
listing with NO error. The phone's 9961-file Camera dir truncated at
~8400 once and db::apply deleted ~1700 good rows. Three layers now:
1. scan::read_dir_full — retry whole-dir reads on mid-stream errors;
2. per-directory cross-check in walk_dir: if the enumeration is far
   below the DB's count for that dir, re-read up to 3x keeping the
   best listing; whole-walk re-check in rescan keeps the larger of two
   walks;
3. db::apply mass-delete guard: never delete >20% of the DB in one
   apply unless a previous walk already saw the low count (two-strike;
   a meta.walked row tracks it). Genuine gradual deletions still flow
   through (verified: a 4000-file mass move streams the grid down
   progressively), and a second consecutive low walk still deletes.

Emulator reliability suite (all pass): 3x launch count stability,
add +1 / remove -1 in ~2 s, 20-file burst, DB recovery from damage,
stale-listing refusal (0 rows lost), two-strike delete, live restore,
idle 0.0% dropped frames, deep fling loads thumbnails. A/B vs ttimg
(no-backend CSS-scroll control): adb-swipe drop deltas are at the
input-injection artifact level, idle identical (0.0%).
2026-11-01 20:24:01 -05:00

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import java.util.Properties
import org.jetbrains.kotlin.gradle.dsl.JvmTarget
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 = 37
namespace = "wow.gmp.gallery"
defaultConfig {
manifestPlaceholders["usesCleartextTraffic"] = "false"
applicationId = "wow.gmp.gallery"
minSdk = 30
targetSdk = 37
versionCode = tauriProperties.getProperty("tauri.android.versionCode", "1").toInt()
versionName = tauriProperties.getProperty("tauri.android.versionName", "1.0")
}
lint {
// personal-device test builds: debuggable flag is intentional
abortOnError = false
checkReleaseBuilds = false
}
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") {
optimization {
enable = true
}
proguardFiles(
*fileTree(".") {
include("**/*.pro")
exclude("build/**")
}.files.toTypedArray()
)
}
}
compileOptions {
sourceCompatibility = JavaVersion.VERSION_1_8
targetCompatibility = JavaVersion.VERSION_1_8
}
buildFeatures {
buildConfig = true
}
}
kotlin {
compilerOptions {
jvmTarget = JvmTarget.JVM_1_8
}
}
rust {
rootDirRel = "../../../"
}
dependencies {
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")
implementation("androidx.lifecycle:lifecycle-process:2.10.0")
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 = file("tauri.build.gradle.kts"))