Screw that Jack compiler, use retrolambda

README.md

@@ -1,4 +1,2 @@
 # Magisk Manager
-The project should be built with Android Studio version 2.2.0+  
+You need to install CMake and NDK to build the zipadjust library for zip preprocessing
-I use Java 8 features, which requires Jack compiler and it's only available in 2.2.0+  
-Also, you need to install CMake and NDK to build the zipadjust library for zip preprocessing

app/build.gradle

@@ -1,4 +1,5 @@
 apply plugin: 'com.android.application'
+apply plugin: 'me.tatarka.retrolambda'
 
 android {
     compileSdkVersion 25
@@ -10,10 +11,6 @@ android {
         targetSdkVersion 25
         versionCode 28
         versionName "4.3.1"
-        jackOptions {
-            enabled true
-            jackInProcess true
-        }
         ndk {
             moduleName 'zipadjust'
             abiFilters 'x86', 'x86_64', 'armeabi-v7a', 'arm64-v8a'
@@ -38,6 +35,14 @@ android {
             path 'src/main/jni/CMakeLists.txt'
         }
     }
+    lintOptions {
+        disable 'MissingTranslation'
+    }
+    retrolambda {
+        javaVersion JavaVersion.VERSION_1_7
+        defaultMethods false
+        incremental true
+    }
 }
 repositories {
     jcenter()

app/proguard-rules.pro

@@ -22,4 +22,8 @@
 -keep interface android.support.v7.** { *; }
 
 # SpongyCastle
--keep class org.spongycastle.** {*;}
+-keep class org.spongycastle.** { *; }
+-dontwarn javax.naming.**
+
+# retrolambda
+-dontwarn java.lang.invoke.*

build.gradle

@@ -7,6 +7,7 @@ buildscript {
     }
     dependencies {
         classpath 'com.android.tools.build:gradle:2.3.0'
+        classpath 'me.tatarka:gradle-retrolambda:3.6.0'
 
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files