fix OCR in apx

android/app/build.gradle.kts

@@ -34,6 +34,10 @@ android {
             // TODO: Add your own signing config for the release build.
             // Signing with the debug keys for now, so `flutter run --release` works.
             signingConfig = signingConfigs.getByName("debug")
+            // Flutter turns R8 on for release. That strips ML Kit classes
+            // discovered via manifest metadata / JNI, so OCR fails in the APK.
+            isMinifyEnabled = false
+            isShrinkResources = false
             proguardFiles(
                 getDefaultProguardFile("proguard-android-optimize.txt"),
                 "proguard-rules.pro",

android/app/proguard-rules.pro

@@ -1,10 +1,15 @@
-# ML Kit text recognition ships Latin only; the plugin still references
-# optional script packs that are not in this app.
--dontwarn com.google.mlkit.vision.text.chinese.ChineseTextRecognizerOptions$Builder
--dontwarn com.google.mlkit.vision.text.chinese.ChineseTextRecognizerOptions
--dontwarn com.google.mlkit.vision.text.devanagari.DevanagariTextRecognizerOptions$Builder
--dontwarn com.google.mlkit.vision.text.devanagari.DevanagariTextRecognizerOptions
--dontwarn com.google.mlkit.vision.text.japanese.JapaneseTextRecognizerOptions$Builder
--dontwarn com.google.mlkit.vision.text.japanese.JapaneseTextRecognizerOptions
--dontwarn com.google.mlkit.vision.text.korean.KoreanTextRecognizerOptions$Builder
--dontwarn com.google.mlkit.vision.text.korean.KoreanTextRecognizerOptions
+# ML Kit text recognition is wired up through manifest metadata, reflection,
+# and JNI. R8 otherwise strips those classes and OCR fails in release APKs.
+-keep class com.google.mlkit.** { *; }
+-keep class com.google.android.gms.internal.mlkit_** { *; }
+-keep class com.google.android.gms.internal.mlkit_vision_** { *; }
+-keep class com.google.android.libraries.vision.** { *; }
+-keep class com.google_mlkit_commons.** { *; }
+-keep class com.google_mlkit_text_recognition.** { *; }
+-keep class * implements com.google.firebase.components.ComponentRegistrar { *; }
+
+# The Flutter plugin references optional script packs that this app does not ship.
+-dontwarn com.google.mlkit.vision.text.chinese.**
+-dontwarn com.google.mlkit.vision.text.devanagari.**
+-dontwarn com.google.mlkit.vision.text.japanese.**
+-dontwarn com.google.mlkit.vision.text.korean.**