-Fixed a situation where additional emails could be duplicated when creating a new key -If CreateKeyEmailFragment view is recreated, the array of additional emails won't be repopulated again if its not null, avoiding new reallocations. -if CreateKeyEmailFragment view is recreated, the email adapter wont be recreated if its not null, avoiding new reallocations.

OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/CreateKeyEmailFragment.java

@@ -39,6 +39,7 @@ import org.sufficientlysecure.keychain.R;
 import org.sufficientlysecure.keychain.ui.CreateKeyActivity.FragAction;
 import org.sufficientlysecure.keychain.ui.dialog.AddEmailDialogFragment;
 import org.sufficientlysecure.keychain.ui.dialog.SetPassphraseDialogFragment;
+import org.sufficientlysecure.keychain.ui.util.Notify;
 import org.sufficientlysecure.keychain.ui.widget.EmailEditText;
 
 import java.util.ArrayList;
@@ -122,16 +123,22 @@ public class CreateKeyEmailFragment extends Fragment {
         mEmailsRecyclerView.setItemAnimator(new DefaultItemAnimator());
 
         // initial values
+        if (mAdditionalEmailModels == null) {
             mAdditionalEmailModels = new ArrayList<>();
             if (mCreateKeyActivity.mAdditionalEmails != null) {
                 setAdditionalEmails(mCreateKeyActivity.mAdditionalEmails);
             }
+        }
+
+        if (mEmailAdapter == null) {
             mEmailAdapter = new EmailAdapter(mAdditionalEmailModels, new View.OnClickListener() {
                 @Override
                 public void onClick(View v) {
                     addEmail();
                 }
             });
+        }
+
         mEmailsRecyclerView.setAdapter(mEmailAdapter);
 
         return view;
@@ -144,10 +151,27 @@ public class CreateKeyEmailFragment extends Fragment {
                 if (message.what == SetPassphraseDialogFragment.MESSAGE_OKAY) {
                     Bundle data = message.getData();
 
+                    String email = data.getString(AddEmailDialogFragment.MESSAGE_DATA_EMAIL);
+
+                    if (email.length() > 0 && mEmailEdit.getText().length() > 0 &&
+                            email.equals(mEmailEdit.getText().toString())) {
+                        Notify.create(getActivity(),
+                                getString(R.string.create_key_email_already_exists_text),
+                                Notify.LENGTH_LONG, Notify.Style.ERROR).show();
+                        return;
+                    }
+                    //check for duplicated emails inside the adapter
+                    for (EmailAdapter.ViewModel model : mAdditionalEmailModels) {
+                        if (email.equals(model.email)) {
+                            Notify.create(getActivity(),
+                                    getString(R.string.create_key_email_already_exists_text),
+                                    Notify.LENGTH_LONG, Notify.Style.ERROR).show();
+                            return;
+                        }
+                    }
+
                     // add new user id
-                    mEmailAdapter.add(
+                    mEmailAdapter.add(email);
-                            data.getString(AddEmailDialogFragment.MESSAGE_DATA_EMAIL)
-                    );
                 }
             }
         };

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

@@ -629,6 +629,7 @@
     <string name="create_key_edit">"Change key configuration"</string>
     <string name="create_key_add_email">"Add email address"</string>
     <string name="create_key_add_email_text">"Additional email addresses are also associated to this key and can be used for secure communication."</string>
+    <string name="create_key_email_already_exists_text">"Email has already been added"</string>
 
     <!-- View key -->
     <string name="view_key_revoked">"Revoked: Key must not be used anymore!"</string>