Add confirm dialog to logout when pressing back would lead to the LoginActivity

app/src/main/java/com/testapp/NavDrawerActivity.java

@@ -156,7 +156,21 @@ public class NavDrawerActivity extends AppCompatActivity implements NavigationVi
         if (drawer.isDrawerOpen(GravityCompat.START)) {
             drawer.closeDrawer(GravityCompat.START);
         } else {
-            super.onBackPressed();
+            if(AppUtils.isLoggedIn()) {
+                new AlertDialog.Builder(this)
+                        .setTitle("Logout")
+                        .setMessage("Are you sure you want to log out?")
+                        .setPositiveButton(R.string.yes, new DialogInterface.OnClickListener() {
+                            @Override
+                            public void onClick(DialogInterface dialog, int which) {
+                                NavDrawerActivity.super.onBackPressed();
+                            }
+                        })
+                        .setNegativeButton(R.string.no, null)
+                        .show();
+            } else {
+                super.onBackPressed();
+            }
         }
     }