o login esta a dar erro

app/src/main/java/com/example/cuida/CuidaApplication.java

@@ -0,0 +1,19 @@
+package com.example.cuida;
+
+import android.app.Application;
+import com.google.firebase.firestore.FirebaseFirestore;
+import com.google.firebase.firestore.FirebaseFirestoreSettings;
+
+public class CuidaApplication extends Application {
+    @Override
+    public void onCreate() {
+        super.onCreate();
+        
+        // Ativar persistência offline globalmente para toda a aplicação
+        FirebaseFirestore db = FirebaseFirestore.getInstance();
+        FirebaseFirestoreSettings settings = new FirebaseFirestoreSettings.Builder()
+                .setPersistenceEnabled(true)
+                .build();
+        db.setFirestoreSettings(settings);
+    }
+}

app/src/main/java/com/example/cuida/ui/appointments/AppointmentsViewModel.java

@@ -99,12 +99,13 @@ public class AppointmentsViewModel extends AndroidViewModel {
                     }
 
                     // Sort locally descending
+                    java.text.SimpleDateFormat format = new java.text.SimpleDateFormat("dd/MM/yyyy HH:mm",
+                            java.util.Locale.getDefault());
                     apps.sort((a, b) -> {
                         try {
-                            java.text.SimpleDateFormat format = new java.text.SimpleDateFormat("dd/MM/yyyy HH:mm",
-                                    java.util.Locale.getDefault());
                             java.util.Date dateA = format.parse(a.date + " " + a.time);
                             java.util.Date dateB = format.parse(b.date + " " + b.time);
+                            if (dateA == null || dateB == null) return 0;
                             return dateB.compareTo(dateA); // Reverse for descending
                         } catch (java.text.ParseException e) {
                             return 0;

app/src/main/java/com/example/cuida/ui/medication/MedicationDialog.java

@@ -124,7 +124,6 @@ public class MedicationDialog extends DialogFragment {
             });
         }
 
-        radioGroupRoute = view.findViewById(R.id.radio_group_route);
         radioOral = view.findViewById(R.id.radio_oral);
         radioTopical = view.findViewById(R.id.radio_topical);
         radioInhalatory = view.findViewById(R.id.radio_inhalatory);
@@ -140,6 +139,7 @@ public class MedicationDialog extends DialogFragment {
                 for (String t : times) {
                     if (!t.isEmpty()) selectedTimes.add(t);
                 }
+                java.util.Collections.sort(selectedTimes);
                 refreshTimeChips();
             }
 
@@ -262,10 +262,10 @@ public class MedicationDialog extends DialogFragment {
     }
 
     private void refreshTimeChips() {
-        if (chipGroupTimes == null) return;
+        if (chipGroupTimes == null || getContext() == null) return;
         chipGroupTimes.removeAllViews();
         for (String time : selectedTimes) {
-            Chip chip = new Chip(requireContext());
+            Chip chip = new Chip(getContext());
             chip.setText(time);
             chip.setCloseIconVisible(true);
             chip.setOnCloseIconClickListener(v -> {

app/src/main/java/com/example/cuida/ui/profile/ProfileFragment.java

@@ -407,7 +407,7 @@ public class ProfileFragment extends Fragment {
                 requireContext().getPackageName() + ".fileprovider", file);
         
         Intent intent = new Intent(Intent.ACTION_SEND);
-        intent.setType("application/pdf");
+        intent.setDataAndType(uri, "application/pdf");
         intent.putExtra(Intent.EXTRA_SUBJECT, "Relatório de Saúde Cuida+");
         intent.putExtra(Intent.EXTRA_STREAM, uri);
         intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);

app/src/main/java/com/example/cuida/ui/sns24/Sns24Fragment.java

@@ -73,6 +73,7 @@ public class Sns24Fragment extends Fragment {
             public void onSuccess(String result) {
                 if (getActivity() != null && binding != null) {
                     getActivity().runOnUiThread(() -> {
+                        if (binding == null) return;
                         // Limpar a marcação da palavra [GRAVE] para não aparecer ao utilizador
                         String displayResult = result.replace("[GRAVE]", "").trim();
                         binding.textAiResult.setText(displayResult);