Enable R8 (Google's Proguard replacement) for smaller, faster (release) apks

app/build.gradle

@@ -36,9 +36,14 @@ android {
         }
     }
     buildTypes {
+        debug {
+            minifyEnabled false
+            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
+        }
         release {
             signingConfig signingConfigs.releaseConfig
-            minifyEnabled false
+            minifyEnabled true
+            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
         }
     }
     flavorDimensions "version"

app/proguard-rules.pro

@@ -0,0 +1 @@
+-dontobfuscate

app/src/main/java/org/transdroid/core/gui/log/DatabaseHelper.java

@@ -20,6 +20,7 @@ import java.sql.SQLException;
 
 import android.content.Context;
 import android.database.sqlite.SQLiteDatabase;
+import android.support.annotation.Keep;
 import android.util.Log;
 
 import com.j256.ormlite.android.apptools.OrmLiteSqliteOpenHelper;
@@ -35,6 +36,7 @@ public class DatabaseHelper extends OrmLiteSqliteOpenHelper {
 	private static final String DATABASE_NAME = "transdroid.db";
 	private static final int DATABASE_VERSION = 1;
 
+	@Keep
 	public DatabaseHelper(Context context) {
 		super(context, DATABASE_NAME, null, DATABASE_VERSION);
 	}

gradle.properties

@@ -15,4 +15,5 @@
 # When configured, Gradle will run in incubating parallel mode.
 # This option should only be used with decoupled projects. More details, visit
 # http://www.gradle.org/docs/current/userguide/multi_project_builds.html#sec:decoupled_projects
-# org.gradle.parallel=true
+# org.gradle.parallel=true
+android.enableR8=true