Продолжаю разбираться с локализацией

android/app/build.gradle

@@ -38,6 +38,22 @@ android {
         }
     }
 
+    productFlavors {
+
+        en {
+            buildConfigField "String", "locale", "\"en\""
+        }
+
+        ru {
+            buildConfigField "String", "locale", "\"ru\""
+        }
+
+        ua {
+            buildConfigField "String", "locale", "\"ua\""
+        }
+
+    }
+
     sourceSets.main {
         jniLibs.srcDir 'jniLibs'
     }

android/app/src/main/java/com/dinect/checker/MainActivity.java

@@ -6,9 +6,11 @@ import android.util.Log;
 import android.widget.Toast;
 import android.content.Context;
 import android.content.SharedPreferences;
-
+import android.content.res.Configuration;
+import android.content.res.Resources;
 import com.dinect.checker.zbar.CameraActivity;
 import com.dinect.checker.zxing.ScannerActivity;
+import java.util.Locale;
 
 import io.flutter.app.FlutterActivity;
 import io.flutter.plugins.GeneratedPluginRegistrant;
@@ -47,7 +49,7 @@ public class MainActivity extends FlutterActivity {
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         GeneratedPluginRegistrant.registerWith(this);
-
+        loadLocale(this);
         mPreferences = getPreferences(Context.MODE_PRIVATE);
 
         Log.d(TAG, "application prefs:");
@@ -144,6 +146,29 @@ public class MainActivity extends FlutterActivity {
         }
     }
 
+    public static void loadLocale(Context context) {
+        Resources res = context.getResources();
+        Configuration configuration = new Configuration(res.getConfiguration());
+        switch (BuildConfig.locale) {
+            case "en":
+                configuration.locale = new Locale("en");
+                Locale.setDefault(configuration.locale);
+                res.updateConfiguration(configuration, res.getDisplayMetrics());
+                break;
+            case "ru":
+                configuration.locale = new Locale("ru");
+                Locale.setDefault(configuration.locale);
+                res.updateConfiguration(configuration, res.getDisplayMetrics());
+                break;
+            case "ua":
+                configuration.locale = new Locale("ua");
+                Locale.setDefault(configuration.locale);
+                res.updateConfiguration(configuration, res.getDisplayMetrics());
+                break;
+        }
+
+    }
+
     public void handleItemClick() {
 
     }