Optimizations for proguard (#803)

* Optimizations for proguard

* changeset

* fix proguard to include jnizero which uses their own annotation

* Enable minifying and use debug signing for sample release variant

Author: davidliu

.changeset/two-sloths-tan.md

@@ -0,0 +1,5 @@
+---
+"client-sdk-android": patch
+---
+
+Proguard rule optimizations

livekit-android-sdk/consumer-rules.pro

@@ -13,28 +13,27 @@
 }
 
 -keep,includedescriptorclasses class io.livekit.android.**$$serializer { *; }
--keepclassmembers class io.livekit.android.** {
-    *** Companion;
-}
+
 -keepclasseswithmembers class io.livekit.android.** {
     kotlinx.serialization.KSerializer serializer(...);
 }
 
 # WebRTC
 #########################################
--keep class livekit.org.webrtc.** { *; }
-
-# JNI Zero initialization (required for WebRTC native method registration)
--keep class livekit.org.jni_zero.JniInit {
-    # Keep the init method un-obfuscated for native code callback
-    private static java.lang.Object[] init();
+# Ensure java methods called from Native are preserved.
+-keepclasseswithmembers,includedescriptorclasses class * {
+    @livekit.**.CalledByNative <methods>;
+}
+-keepclasseswithmembers,includedescriptorclasses class * {
+    @livekit.**.CalledByNativeUnchecked <methods>;
 }
 
 # NIST sdp parser
 #########################################
--keep class android.gov.nist.** { *; }
--dontwarn com.sun.nio.sctp.**
--dontwarn org.apache.log4j.**
+# Preserve reflection used for Parser registrations
+-keep class android.gov.nist.javax.sdp.parser.*Parser { *; }
+-keep class android.gov.nist.javax.sdp.parser.ParserFactory { *; }
+-keep class android.gov.nist.javax.sdp.parser.SDPParser { *; }
 
 # Protobuf
 #########################################

sample-app-compose/build.gradle

@@ -23,8 +23,10 @@ android {
 
     buildTypes {
         release {
-            minifyEnabled false
+            minifyEnabled true
             proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
+            // For testing purposes only. Use your own signing keys when making a production app.
+            signingConfig signingConfigs.debug
         }
     }
     compileOptions {