Added retry on boundary error

app/src/main/java/eu/faircode/email/BoundaryCallbackMessages.java

@@ -118,6 +118,11 @@ public class BoundaryCallbackMessages extends PagedList.BoundaryCallback<TupleMe
         queue_load(false);
     }
 
+    void retry() {
+        state.reset();
+        queue_load(true);
+    }
+
     private void queue_load(final boolean zero) {
         final State state = this.state;
 

app/src/main/java/eu/faircode/email/FragmentMessages.java

@@ -116,7 +116,6 @@ import androidx.swiperefreshlayout.widget.SwipeRefreshLayout;
 import com.google.android.material.bottomnavigation.BottomNavigationView;
 import com.google.android.material.floatingactionbutton.FloatingActionButton;
 import com.google.android.material.snackbar.Snackbar;
-import com.sun.mail.util.FolderClosedIOException;
 
 import org.bouncycastle.asn1.cms.Attribute;
 import org.bouncycastle.asn1.cms.AttributeTable;
@@ -192,7 +191,6 @@ import java.util.Objects;
 import java.util.Properties;
 
 import javax.mail.Address;
-import javax.mail.FolderClosedException;
 import javax.mail.Session;
 import javax.mail.internet.InternetAddress;
 import javax.mail.internet.MimeMessage;
@@ -318,6 +316,7 @@ public class FragmentMessages extends FragmentBase implements SharedPreferences.
     private static final int REQUEST_SEARCH = 18;
     private static final int REQUEST_ACCOUNT = 19;
     private static final int REQUEST_EMPTY_FOLDER = 20;
+    private static final int REQUEST_BOUNDARY_RETRY = 21;
 
     static final String ACTION_STORE_RAW = BuildConfig.APPLICATION_ID + ".STORE_RAW";
     static final String ACTION_DECRYPT = BuildConfig.APPLICATION_ID + ".DECRYPT";
@@ -3797,6 +3796,7 @@ public class FragmentMessages extends FragmentBase implements SharedPreferences.
         public void onException(@NonNull Throwable ex) {
             if (getLifecycle().getCurrentState().isAtLeast(Lifecycle.State.STARTED))
                 if (ex instanceof IllegalStateException) {
+                    // No internet connection
                     Snackbar snackbar = Snackbar.make(view, ex.getMessage(), Snackbar.LENGTH_LONG);
                     snackbar.setAction(R.string.title_fix, new View.OnClickListener() {
                         @Override
@@ -3807,15 +3807,13 @@ public class FragmentMessages extends FragmentBase implements SharedPreferences.
                         }
                     });
                     snackbar.show();
-                } else if (ex instanceof IllegalArgumentException ||
+                } else {
-                        ex instanceof FolderClosedException || ex instanceof FolderClosedIOException)
-                    Snackbar.make(view, ex.getMessage(), Snackbar.LENGTH_LONG).show();
-                else {
                     Bundle args = new Bundle();
                     args.putString("error", Log.formatThrowable(ex, false));
 
-                    FragmentDialogError fragment = new FragmentDialogError();
+                    FragmentDialogBoundaryError fragment = new FragmentDialogBoundaryError();
                     fragment.setArguments(args);
+                    fragment.setTargetFragment(FragmentMessages.this, REQUEST_BOUNDARY_RETRY);
                     fragment.show(getParentFragmentManager(), "boundary:error");
                 }
         }
@@ -4863,6 +4861,10 @@ public class FragmentMessages extends FragmentBase implements SharedPreferences.
                     if (resultCode == RESULT_OK)
                         onEmptyFolder(data.getBundleExtra("args"));
                     break;
+                case REQUEST_BOUNDARY_RETRY:
+                    if (resultCode == RESULT_OK)
+                        onBoundaryRetry();
+                    break;
             }
         } catch (Throwable ex) {
             Log.e(ex);
@@ -6356,6 +6358,11 @@ public class FragmentMessages extends FragmentBase implements SharedPreferences.
         }.execute(this, args, "folder:delete");
     }
 
+    private void onBoundaryRetry() {
+        ViewModelMessages model = new ViewModelProvider(getActivity()).get(ViewModelMessages.class);
+        model.retry(viewType);
+    }
+
     static void search(
             final Context context, final LifecycleOwner owner, final FragmentManager manager,
             long account, long folder, boolean server, String query) {
@@ -6654,15 +6661,31 @@ public class FragmentMessages extends FragmentBase implements SharedPreferences.
         }
     }
 
-    public static class FragmentDialogError extends FragmentDialogBase {
+    public static class FragmentDialogBoundaryError extends FragmentDialogBase {
         @NonNull
         @Override
         public Dialog onCreateDialog(@Nullable Bundle savedInstanceState) {
             String error = getArguments().getString("error");
 
+            View dview = LayoutInflater.from(getContext()).inflate(R.layout.dialog_boundary_error, null);
+            TextView tvError = dview.findViewById(R.id.tvError);
+
+            tvError.setText(error);
+
             return new AlertDialog.Builder(getContext())
-                    .setMessage(error)
+                    .setView(dview)
-                    .setPositiveButton(android.R.string.cancel, null)
+                    .setPositiveButton(R.string.title_boundary_retry, new DialogInterface.OnClickListener() {
+                        @Override
+                        public void onClick(DialogInterface dialog, int which) {
+                            sendResult(Activity.RESULT_OK);
+                        }
+                    })
+                    .setNegativeButton(android.R.string.cancel, new DialogInterface.OnClickListener() {
+                        @Override
+                        public void onClick(DialogInterface dialogInterface, int i) {
+                            sendResult(Activity.RESULT_CANCELED);
+                        }
+                    })
                     .create();
         }
     }

app/src/main/java/eu/faircode/email/ViewModelMessages.java

@@ -207,6 +207,12 @@ public class ViewModelMessages extends ViewModel {
         return model;
     }
 
+    void retry(AdapterMessage.ViewType viewType) {
+        Model model = models.get(viewType);
+        if (model != null && model.boundary != null)
+            model.boundary.retry();
+    }
+
     @Override
     protected void onCleared() {
         for (AdapterMessage.ViewType viewType : new ArrayList<>(models.keySet()))

app/src/main/res/layout/dialog_boundary_error.xml

@@ -0,0 +1,34 @@
+<?xml version="1.0" encoding="utf-8"?>
+<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content"
+    android:padding="24dp"
+    android:scrollbarStyle="outsideOverlay">
+
+    <androidx.constraintlayout.widget.ConstraintLayout
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content">
+
+        <eu.faircode.email.FixedTextView
+            android:id="@+id/tvMessage"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:text="@string/title_boundary_error"
+            android:textAppearance="@style/TextAppearance.AppCompat.Medium"
+            android:textColor="?android:attr/textColorPrimary"
+            app:layout_constraintStart_toStartOf="parent"
+            app:layout_constraintTop_toTopOf="parent" />
+
+        <eu.faircode.email.FixedTextView
+            android:id="@+id/tvError"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="12dp"
+            android:text="Error"
+            android:textAppearance="@style/TextAppearance.AppCompat.Small"
+            android:textColor="?android:attr/textColorPrimary"
+            app:layout_constraintStart_toStartOf="parent"
+            app:layout_constraintTop_toBottomOf="@id/tvMessage" />
+    </androidx.constraintlayout.widget.ConstraintLayout>
+</ScrollView>

app/src/main/res/values/strings.xml

@@ -1177,6 +1177,9 @@
     <string name="title_pro_invalid">Invalid response</string>
     <string name="title_pro_support">FairEmail needs your help. Tap to purchase pro features to keep the project going.</string>
 
+    <string name="title_boundary_error">Error on downloading messages from the email server</string>
+    <string name="title_boundary_retry">Try again</string>
+
     <string name="title_unexpected_error">Unexpected error</string>
     <string name="title_log">Log</string>
     <string name="title_auto_scroll">Auto scroll</string>