diff --git a/app/src/main/java/com/example/dcav2gui/MainActivity.java b/app/src/main/java/com/example/dcav2gui/MainActivity.java
index 6f6912b..c751cad 100644
--- a/app/src/main/java/com/example/dcav2gui/MainActivity.java
+++ b/app/src/main/java/com/example/dcav2gui/MainActivity.java
@@ -7,12 +7,11 @@ import androidx.navigation.Navigation;//
 import android.os.Bundle;
 import android.view.View;
 import android.view.Menu;
+import android.widget.Toast;
 
 import com.google.android.material.snackbar.Snackbar;
 import com.google.android.material.navigation.NavigationView;
 
-import androidx.navigation.NavController;
-import androidx.navigation.Navigation;
 import androidx.navigation.ui.AppBarConfiguration;
 import androidx.navigation.ui.NavigationUI;
 import androidx.drawerlayout.widget.DrawerLayout;
@@ -20,6 +19,8 @@ import androidx.appcompat.app.AppCompatActivity;
 
 import com.example.dcav2gui.databinding.ActivityMainBinding;
 
+import java.io.File;
+
 public class MainActivity extends AppCompatActivity {
 
     private AppBarConfiguration mAppBarConfiguration;
@@ -58,6 +59,12 @@ public class MainActivity extends AppCompatActivity {
         NavController navController = Navigation.findNavController(this, R.id.nav_host_fragment_content_main);
         NavigationUI.setupActionBarWithNavController(this, navController, mAppBarConfiguration);
         NavigationUI.setupWithNavController(navigationView, navController);
+
+        // Check for settings file
+        if (!isSettingsFileExists()) {
+            Toast.makeText(this, "Please enter your credentials in the settings menu", Toast.LENGTH_LONG).show();
+        }
+
     }
 
     @Override
@@ -65,24 +72,31 @@ public class MainActivity extends AppCompatActivity {
         // Inflate the menu; this adds items to the action bar if it is present.
         getMenuInflater().inflate(R.menu.main, menu);
         return true;
+
     }
 
-@Override
-public boolean onOptionsItemSelected(MenuItem item) {
-    // Handle action bar item clicks here. The action bar will
-    // automatically handle clicks on the Home/Up button, so long
-    // as you specify a parent activity in AndroidManifest.xml.
-    int id = item.getItemId();
-
-    if (id == R.id.action_settings) {
-        // Navigate to the SettingsFragment
-        NavController navController = Navigation.findNavController(this, R.id.nav_host_fragment_content_main);
-        navController.navigate(R.id.nav_settings);
-        return true;
+    private boolean isSettingsFileExists() {
+        File file = new File(getFilesDir(), "settings.json");
+        return file.exists();
+    }
+
+    @Override
+    public boolean onOptionsItemSelected(MenuItem item) {
+        // Handle action bar item clicks here. The action bar will
+        // automatically handle clicks on the Home/Up button, so long
+        // as you specify a parent activity in AndroidManifest.xml.
+        int id = item.getItemId();
+
+        if (id == R.id.action_settings) {
+            // Navigate to the SettingsFragment
+            NavController navController = Navigation.findNavController(this, R.id.nav_host_fragment_content_main);
+            navController.navigate(R.id.nav_settings);
+            return true;
+        }
+
+        return super.onOptionsItemSelected(item);
     }
 
-    return super.onOptionsItemSelected(item);
-}
     @Override
     public boolean onSupportNavigateUp() {
         NavController navController = Navigation.findNavController(this, R.id.nav_host_fragment_content_main);