Split ABIs for smaller apk size

mobile/build.gradle

@@ -1,3 +1,4 @@
+import com.android.build.OutputFile
 import java.util.regex.Matcher
 import java.util.regex.Pattern
 
@@ -19,7 +20,7 @@ android {
         applicationId "com.github.shadowsocks"
         minSdkVersion rootProject.minSdkVersion
         targetSdkVersion rootProject.sdkVersion
-        versionCode 200
+        versionCode 1
         versionName "4.4.0"
         testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
         vectorDrawables.useSupportLibrary true
@@ -37,6 +38,15 @@ android {
     }
     lintOptions {
         abortOnError false
+        checkReleaseBuilds false
+    }
+    splits {
+        abi {
+            enable true
+            reset()
+            include 'armeabi-v7a', 'arm64-v8a', 'x86'
+            universalApk false
+        }
     }
     sourceSets.main.jniLibs.srcDirs +=
             new File(project(':core').buildDir, "intermediates/bundles/${getCurrentFlavor()}/jni")
@@ -78,3 +88,11 @@ repositories {
 }
 
 apply plugin: 'com.google.gms.google-services'
+
+ext.abiCodes = ['armeabi-v7a': 1, 'arm64-v8a': 2, x86: 3]
+android.applicationVariants.all { variant ->
+    variant.outputs.each { output ->
+        def baseAbiVersionCode = project.ext.abiCodes.get(output.getFilter(OutputFile.ABI))
+        if (baseAbiVersionCode != null) output.versionCodeOverride = baseAbiVersionCode * 1000 + variant.versionCode
+    }
+}