fix navigation

app/src/main/java/fr/svpro/radiomercure/MainActivity.java

@@ -2,7 +2,6 @@ package fr.svpro.radiomercure;
 
 import android.Manifest;
 import android.annotation.SuppressLint;
-import android.annotation.TargetApi;
 import android.app.AlertDialog;
 import android.app.Dialog;
 import android.app.DownloadManager;
@@ -11,7 +10,6 @@ import android.content.Context;
 import android.content.Intent;
 import android.content.ServiceConnection;
 import android.content.pm.PackageManager;
-import android.graphics.Color;
 import android.net.Uri;
 import android.os.Build;
 import android.os.Bundle;
@@ -19,15 +17,12 @@ import android.os.Environment;
 import android.os.IBinder;
 import android.os.PowerManager;
 import android.provider.Settings;
-import android.view.Menu;
 import android.view.MenuItem;
-import android.view.View;
 import android.webkit.CookieManager;
 import android.webkit.URLUtil;
 import android.webkit.WebSettings;
 import android.webkit.WebView;
 import android.webkit.WebViewClient;
-import android.widget.ImageView;
 import android.widget.TextView;
 import android.widget.Toast;
 
@@ -39,11 +34,9 @@ import androidx.appcompat.widget.Toolbar;
 import androidx.core.app.ActivityCompat;
 import androidx.core.view.GravityCompat;
 import androidx.drawerlayout.widget.DrawerLayout;
-import androidx.swiperefreshlayout.widget.SwipeRefreshLayout;
 
 import com.google.android.material.floatingactionbutton.FloatingActionButton;
 import com.google.android.material.navigation.NavigationView;
-import com.google.android.material.snackbar.Snackbar;
 
 public class MainActivity extends AppCompatActivity {
 
@@ -108,6 +101,10 @@ public class MainActivity extends AppCompatActivity {
                     case R.id.exit:
                         System.exit(0);
                         break;
+
+                    case R.id.about:
+                        dialog.show();
+                        break;
                 }
 
                 drawerLayout.closeDrawer(GravityCompat.START);