Resolve "Improve build process"

Closes #72 (closed)

android/app/build.gradle

@@ -62,6 +62,31 @@ android {
             signingConfig signingConfigs.release
         }
     }
+
+    splits {
+        abi {
+            reset()
+            include('armeabi-v7a', 'x86', 'x86_64')
+        }
+    }
+}
+
+ext.abiCodes = [
+    'armeabi-v7a': 1,
+    'x86': 2,
+    'x86_64': 3
+]
+
+import com.android.build.OutputFile
+
+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
+    }
+  }
 }
 
 flutter {