Add release build config and Play Store prep

- Add signing config (reads from env vars)
- Enable R8 minification and resource shrinking
- Expand ProGuard rules for Gson
- Update README with build instructions and Play Store checklist

README.md

@@ -185,9 +185,44 @@ curl -s http://192.168.42.1:8765/status | jq -r '"\(.connection.type) \(.connect
 
 ## Building
 
-1. Open in Android Studio
-2. Build > Build APK
-3. Install APK on your phone
+### Debug build
+
+```bash
+./gradlew assembleDebug
+# Output: app/build/outputs/apk/debug/app-debug.apk
+```
+
+### Release build
+
+1. Generate a keystore:
+```bash
+keytool -genkey -v -keystore keystore.jks -keyalg RSA -keysize 2048 -validity 10000 -alias release
+```
+
+2. Build with signing:
+```bash
+export KEYSTORE_PASSWORD="your-password"
+export KEY_ALIAS="release"
+export KEY_PASSWORD="your-key-password"
+./gradlew assembleRelease
+# Output: app/build/outputs/apk/release/app-release.apk
+```
+
+## Play Store Publishing
+
+### Still needed:
+
+- [ ] **App icons** - Replace placeholder icons in `app/src/main/res/mipmap-*` with proper 512x512 adaptive icons
+- [ ] **Privacy policy** - Required URL (app uses location permission)
+- [ ] **Screenshots** - Phone screenshots for Play Store listing
+- [ ] **Feature graphic** - 1024x500 banner image
+- [ ] **Store description** - Short and full descriptions
+
+### Already configured:
+
+- [x] Release signing config
+- [x] ProGuard/R8 minification
+- [x] Target SDK 36 (meets Play Store requirements)
 
 ## License
 

app/build.gradle.kts

@@ -15,13 +15,27 @@ android {
         versionName = "1.0.0"
     }
 
+    signingConfigs {
+        create("release") {
+            val keystoreFile = file("../keystore.jks")
+            if (keystoreFile.exists()) {
+                storeFile = keystoreFile
+                storePassword = System.getenv("KEYSTORE_PASSWORD") ?: ""
+                keyAlias = System.getenv("KEY_ALIAS") ?: "release"
+                keyPassword = System.getenv("KEY_PASSWORD") ?: ""
+            }
+        }
+    }
+
     buildTypes {
         release {
-            isMinifyEnabled = false
+            isMinifyEnabled = true
+            isShrinkResources = true
             proguardFiles(
                 getDefaultProguardFile("proguard-android-optimize.txt"),
                 "proguard-rules.pro"
             )
+            signingConfig = signingConfigs.findByName("release")
         }
     }
 

app/proguard-rules.pro

@@ -6,3 +6,10 @@
 -keepattributes Signature
 -keepattributes *Annotation*
 -keep class dev.itsh.tetherapi.data.** { *; }
+-keep class com.google.gson.** { *; }
+
+# Keep generic type info for Gson
+-keepattributes EnclosingMethod
+-keep class * implements com.google.gson.TypeAdapterFactory
+-keep class * implements com.google.gson.JsonSerializer
+-keep class * implements com.google.gson.JsonDeserializer