A whole lot of stuff

android/app/proguard-rules.pro

@@ -12,3 +12,24 @@
 -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
+
+# The -dontwarn rules above only silence build-time warnings — they don't
+# stop R8 from stripping/renaming classes the Latin recognizer actually
+# does use at runtime via reflection. Without an explicit -keep, release
+# builds installed and launched fine but every OCR attempt threw
+# "Attempt to invoke virtual method 'java.lang.Class
+# java.lang.Object.getClass()' on a null object reference" from inside the
+# ML Kit plugin, silently swallowed by receipt_capture.dart's catch block
+# and surfaced to the user as "Couldn't automatically read this receipt."
+-keep class com.google.mlkit.** { *; }
+-keep class com.google.android.gms.internal.mlkit_vision_text_common.** { *; }
+
+# AndroidX WorkManager (pulled in transitively by one of the Google SDKs,
+# not used directly by this app) initializes its Room-backed WorkDatabase
+# reflectively at process startup via androidx.startup.InitializationProvider
+# — R8 was stripping/renaming those generated Room implementation classes,
+# crashing every release build before Flutter even started ("Failed to
+# create an instance of androidx.work.impl.WorkDatabase"). Keeping the
+# whole (small, self-contained) impl package is the standard fix.
+-keep class androidx.work.impl.** { *; }
+-keep class androidx.room.** { *; }