diff --git a/app/src/main/java/cc/niushuai/project/devcontrol/MainActivity.java b/app/src/main/java/cc/niushuai/project/devcontrol/MainActivity.java
index 02b84ae..298eaed 100644
--- a/app/src/main/java/cc/niushuai/project/devcontrol/MainActivity.java
+++ b/app/src/main/java/cc/niushuai/project/devcontrol/MainActivity.java
@@ -1,19 +1,11 @@
 package cc.niushuai.project.devcontrol;
 
-import androidx.annotation.NonNull;
-import androidx.annotation.Nullable;
-import androidx.appcompat.app.AppCompatActivity;
-import androidx.fragment.app.Fragment;
-import androidx.navigation.NavController;
-import androidx.navigation.NavDestination;
-import androidx.navigation.Navigation;
-import androidx.navigation.fragment.NavHostFragment;
-import androidx.navigation.ui.AppBarConfiguration;
-import androidx.navigation.ui.NavigationUI;
-
 import android.os.Bundle;
-import android.view.Menu;
-import android.widget.Toast;
+
+import androidx.appcompat.app.AppCompatActivity;
+import androidx.navigation.NavController;
+import androidx.navigation.Navigation;
+import androidx.navigation.ui.NavigationUI;
 
 import com.google.android.material.bottomnavigation.BottomNavigationView;