システムナビゲーションの背景をボトムナビゲーションと同じに

app/src/main/java/one/nem/lacerta/MainActivity.java

@@ -1,11 +1,13 @@
 package one.nem.lacerta;
 
 import androidx.appcompat.app.AppCompatActivity;
+import androidx.core.content.ContextCompat;
 import androidx.fragment.app.FragmentManager;
 import androidx.navigation.NavController;
 import androidx.navigation.fragment.NavHostFragment;
 import androidx.navigation.ui.NavigationUI;
 
+import android.graphics.Color;
 import android.os.Bundle;
 import android.widget.Toast;
 
@@ -36,6 +38,8 @@ public class MainActivity extends AppCompatActivity {
 
         Toast.makeText(this, "testMessage", Toast.LENGTH_SHORT).show();
 
+        getWindow().setNavigationBarColor(ContextCompat.getColor(this, one.nem.lacerta.shared.ui.R.color.colorSurfaceVariant));
+
 
     }