Add capability to request username creation during registration.

app/src/main/java/org/thoughtcrime/securesms/PassphraseRequiredActivity.java

@@ -20,17 +20,20 @@ import org.thoughtcrime.securesms.crypto.MasterSecretUtil;
 import org.thoughtcrime.securesms.dependencies.ApplicationDependencies;
 import org.thoughtcrime.securesms.devicetransfer.olddevice.OldDeviceTransferActivity;
 import org.thoughtcrime.securesms.jobs.PushNotificationReceiveJob;
+import org.thoughtcrime.securesms.keyvalue.PhoneNumberPrivacyValues;
 import org.thoughtcrime.securesms.keyvalue.SignalStore;
 import org.thoughtcrime.securesms.lock.v2.CreateKbsPinActivity;
 import org.thoughtcrime.securesms.migrations.ApplicationMigrationActivity;
 import org.thoughtcrime.securesms.migrations.ApplicationMigrations;
 import org.thoughtcrime.securesms.pin.PinRestoreActivity;
 import org.thoughtcrime.securesms.profiles.edit.EditProfileActivity;
+import org.thoughtcrime.securesms.profiles.username.AddAUsernameActivity;
 import org.thoughtcrime.securesms.push.SignalServiceNetworkAccess;
 import org.thoughtcrime.securesms.recipients.Recipient;
 import org.thoughtcrime.securesms.registration.RegistrationNavigationActivity;
 import org.thoughtcrime.securesms.service.KeyCachingService;
 import org.thoughtcrime.securesms.util.AppStartup;
+import org.thoughtcrime.securesms.util.FeatureFlags;
 import org.thoughtcrime.securesms.util.TextSecurePreferences;
 
 import java.util.Locale;
@@ -52,6 +55,7 @@ public abstract class PassphraseRequiredActivity extends BaseActivity implements
   private static final int STATE_TRANSFER_ONGOING    = 8;
   private static final int STATE_TRANSFER_LOCKED     = 9;
   private static final int STATE_CHANGE_NUMBER_LOCK  = 10;
+  private static final int STATE_CREATE_USERNAME     = 11;
 
   private SignalServiceNetworkAccess networkAccess;
   private BroadcastReceiver          clearKeyReceiver;
@@ -156,6 +160,7 @@ public abstract class PassphraseRequiredActivity extends BaseActivity implements
       case STATE_TRANSFER_ONGOING:    return getOldDeviceTransferIntent();
       case STATE_TRANSFER_LOCKED:     return getOldDeviceTransferLockedIntent();
       case STATE_CHANGE_NUMBER_LOCK:  return getChangeNumberLockIntent();
+      case STATE_CREATE_USERNAME:     return getCreateUsernameIntent();
       default:                        return null;
     }
   }
@@ -175,6 +180,8 @@ public abstract class PassphraseRequiredActivity extends BaseActivity implements
       return STATE_CREATE_SIGNAL_PIN;
     } else if (userMustSetProfileName()) {
       return STATE_CREATE_PROFILE_NAME;
+    } else if (shouldAskUserToCreateUsername()) {
+      return STATE_CREATE_USERNAME;
     } else if (userMustCreateSignalPin()) {
       return STATE_CREATE_SIGNAL_PIN;
     } else if (EventBus.getDefault().getStickyEvent(TransferStatus.class) != null && getClass() != OldDeviceTransferActivity.class) {
@@ -200,6 +207,13 @@ public abstract class PassphraseRequiredActivity extends BaseActivity implements
     return !SignalStore.registrationValues().isRegistrationComplete() && Recipient.self().getProfileName().isEmpty();
   }
 
+  private boolean shouldAskUserToCreateUsername() {
+    return FeatureFlags.usernames() &&
+           FeatureFlags.phoneNumberPrivacy() &&
+           !SignalStore.uiHints().hasSetOrSkippedUsernameCreation() &&
+           SignalStore.phoneNumberPrivacy().getPhoneNumberListingMode() == PhoneNumberPrivacyValues.PhoneNumberListingMode.UNLISTED;
+  }
+
   private Intent getCreatePassphraseIntent() {
     return getRoutedIntent(PassphraseCreateActivity.class, getIntent());
   }
@@ -259,6 +273,10 @@ public abstract class PassphraseRequiredActivity extends BaseActivity implements
     return ChangeNumberLockActivity.createIntent(this);
   }
 
+  private Intent getCreateUsernameIntent() {
+    return getRoutedIntent(AddAUsernameActivity.class, getIntent());
+  }
+
   private Intent getRoutedIntent(Intent destination, @Nullable Intent nextIntent) {
     if (nextIntent != null)   destination.putExtra("next_intent", nextIntent);
     return destination;

app/src/main/java/org/thoughtcrime/securesms/components/ProgressCard.kt

@@ -0,0 +1,22 @@
+package org.thoughtcrime.securesms.components
+
+import android.content.Context
+import android.util.AttributeSet
+import com.google.android.material.card.MaterialCardView
+import org.thoughtcrime.securesms.R
+
+/**
+ * A small card with a circular progress indicator in it. Usable in place
+ * of a ProgressDialog, which is deprecated.
+ *
+ * Remember to add this as the last UI element in your XML hierarchy so it'll
+ * draw over top of other elements.
+ */
+class ProgressCard @JvmOverloads constructor(
+  context: Context,
+  attrs: AttributeSet? = null
+) : MaterialCardView(context, attrs) {
+  init {
+    inflate(context, R.layout.progress_card, this)
+  }
+}

app/src/main/java/org/thoughtcrime/securesms/keyvalue/UiHints.java

@@ -9,6 +9,7 @@ public class UiHints extends SignalStoreValues {
 
   private static final String HAS_SEEN_GROUP_SETTINGS_MENU_TOAST     = "uihints.has_seen_group_settings_menu_toast";
   private static final String HAS_CONFIRMED_DELETE_FOR_EVERYONE_ONCE = "uihints.has_confirmed_delete_for_everyone_once";
+  private static final String HAS_SET_OR_SKIPPED_USERNAME_CREATION   = "uihints.has_set_or_skipped_username_creation";
 
   UiHints(@NonNull KeyValueStore store) {
     super(store);
@@ -39,4 +40,12 @@ public class UiHints extends SignalStoreValues {
   public boolean hasConfirmedDeleteForEveryoneOnce() {
     return getBoolean(HAS_CONFIRMED_DELETE_FOR_EVERYONE_ONCE, false);
   }
+
+  public boolean hasSetOrSkippedUsernameCreation() {
+    return getBoolean(HAS_SET_OR_SKIPPED_USERNAME_CREATION, false);
+  }
+
+  public void markHasSetOrSkippedUsernameCreation() {
+    putBoolean(HAS_SET_OR_SKIPPED_USERNAME_CREATION, true);
+  }
 }

app/src/main/java/org/thoughtcrime/securesms/profiles/edit/EditProfileActivity.java

@@ -1,7 +1,6 @@
 package org.thoughtcrime.securesms.profiles.edit;
 
 
-import android.annotation.SuppressLint;
 import android.content.Context;
 import android.content.Intent;
 import android.os.Bundle;
@@ -20,7 +19,6 @@ import org.thoughtcrime.securesms.util.DynamicTheme;
 /**
  * Shows editing screen for your profile during registration. Also handles group name editing.
  */
-@SuppressLint("StaticFieldLeak")
 public class EditProfileActivity extends BaseActivity implements EditProfileFragment.Controller {
 
   public static final String NEXT_INTENT       = "next_intent";
@@ -37,13 +35,6 @@ public class EditProfileActivity extends BaseActivity implements EditProfileFrag
     return intent;
   }
 
-  public static @NonNull Intent getIntentForUserProfileEdit(@NonNull Context context) {
-    Intent intent = new Intent(context, EditProfileActivity.class);
-    intent.putExtra(EditProfileActivity.EXCLUDE_SYSTEM, true);
-    intent.putExtra(EditProfileActivity.NEXT_BUTTON_TEXT, R.string.save);
-    return intent;
-  }
-
   public static @NonNull Intent getIntentForGroupProfile(@NonNull Context context, @NonNull GroupId groupId) {
     Intent intent = new Intent(context, EditProfileActivity.class);
     intent.putExtra(EditProfileActivity.SHOW_TOOLBAR, true);

app/src/main/java/org/thoughtcrime/securesms/profiles/edit/EditProfileFragment.java

@@ -18,6 +18,7 @@ import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
 import androidx.annotation.RequiresApi;
 import androidx.core.content.ContextCompat;
+import androidx.lifecycle.ViewModelProvider;
 import androidx.lifecycle.ViewModelProviders;
 import androidx.navigation.Navigation;
 
@@ -91,7 +92,7 @@ public class EditProfileFragment extends LoggingFragment {
     GroupId groupId = GroupId.parseNullableOrThrow(requireArguments().getString(GROUP_ID, null));
 
     initializeViewModel(requireArguments().getBoolean(EXCLUDE_SYSTEM, false), groupId, savedInstanceState != null);
-    initializeResources(view, groupId);
+    initializeResources(groupId);
     initializeProfileAvatar();
     initializeProfileName();
 
@@ -151,11 +152,10 @@ public class EditProfileFragment extends LoggingFragment {
 
     EditProfileViewModel.Factory factory = new EditProfileViewModel.Factory(repository, hasSavedInstanceState, groupId);
 
-    viewModel = ViewModelProviders.of(requireActivity(), factory)
-                                  .get(EditProfileViewModel.class);
+    viewModel = new ViewModelProvider(requireActivity(), factory).get(EditProfileViewModel.class);
   }
 
-  private void initializeResources(@NonNull View view, @Nullable GroupId groupId) {
+  private void initializeResources(@Nullable GroupId groupId) {
     Bundle  arguments      = requireArguments();
     boolean isEditingGroup = groupId != null;
 

app/src/main/java/org/thoughtcrime/securesms/profiles/manage/UsernameEditFragment.java

@@ -1,7 +1,7 @@
 package org.thoughtcrime.securesms.profiles.manage;
 
+import android.content.Intent;
 import android.content.res.ColorStateList;
-import android.graphics.Color;
 import android.graphics.drawable.Drawable;
 import android.os.Bundle;
 import android.view.LayoutInflater;
@@ -17,6 +17,7 @@ import android.widget.Toast;
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
 import androidx.core.content.ContextCompat;
+import androidx.fragment.app.FragmentActivity;
 import androidx.fragment.app.FragmentManager;
 import androidx.lifecycle.ViewModelProvider;
 import androidx.navigation.Navigation;
@@ -29,10 +30,12 @@ import com.google.android.material.textfield.TextInputLayout;
 
 import org.signal.core.util.DimensionUnit;
 import org.thoughtcrime.securesms.LoggingFragment;
+import org.thoughtcrime.securesms.PassphraseRequiredActivity;
 import org.thoughtcrime.securesms.R;
 import org.thoughtcrime.securesms.contactshare.SimpleTextWatcher;
 import org.thoughtcrime.securesms.databinding.UsernameEditFragmentBinding;
 import org.thoughtcrime.securesms.recipients.Recipient;
+import org.thoughtcrime.securesms.util.AccessibilityUtil;
 import org.thoughtcrime.securesms.util.FragmentResultContract;
 import org.thoughtcrime.securesms.util.LifecycleDisposable;
 import org.thoughtcrime.securesms.util.UsernameUtil;
@@ -49,6 +52,7 @@ public class UsernameEditFragment extends LoggingFragment {
   private UsernameEditFragmentBinding binding;
   private ImageView                   suffixProgress;
   private LifecycleDisposable         lifecycleDisposable;
+  private UsernameEditFragmentArgs    args;
 
   public static UsernameEditFragment newInstance() {
     return new UsernameEditFragment();
@@ -62,20 +66,37 @@ public class UsernameEditFragment extends LoggingFragment {
 
   @Override
   public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
-    binding.toolbar.setNavigationOnClickListener(v -> Navigation.findNavController(view).popBackStack());
+    Bundle bundle = getArguments();
+    if (bundle != null) {
+      args = UsernameEditFragmentArgs.fromBundle(bundle);
+    } else {
+      args = new UsernameEditFragmentArgs.Builder().build();
+    }
+
+    if (args.getIsInRegistration()) {
+      binding.toolbar.setNavigationIcon(null);
+      binding.toolbar.setTitle(R.string.UsernameEditFragment__add_a_username);
+      binding.usernameSkipButton.setVisibility(View.VISIBLE);
+      binding.usernameDoneButton.setVisibility(View.VISIBLE);
+    } else {
+      binding.toolbar.setNavigationOnClickListener(v -> Navigation.findNavController(view).popBackStack());
+      binding.usernameSubmitButton.setVisibility(View.VISIBLE);
+    }
 
     binding.usernameTextWrapper.setErrorIconDrawable(null);
 
     lifecycleDisposable = new LifecycleDisposable();
     lifecycleDisposable.bindTo(getViewLifecycleOwner());
 
-    viewModel = new ViewModelProvider(this, new UsernameEditViewModel.Factory()).get(UsernameEditViewModel.class);
+    viewModel = new ViewModelProvider(this, new UsernameEditViewModel.Factory(args.getIsInRegistration())).get(UsernameEditViewModel.class);
 
     lifecycleDisposable.add(viewModel.getUiState().subscribe(this::onUiStateChanged));
     viewModel.getEvents().observe(getViewLifecycleOwner(), this::onEvent);
 
     binding.usernameSubmitButton.setOnClickListener(v -> viewModel.onUsernameSubmitted());
     binding.usernameDeleteButton.setOnClickListener(v -> viewModel.onUsernameDeleted());
+    binding.usernameDoneButton.setOnClickListener(v -> viewModel.onUsernameSubmitted());
+    binding.usernameSkipButton.setOnClickListener(v -> viewModel.onUsernameSkipped());
 
     UsernameState usernameState = Recipient.self().getUsername().<UsernameState>map(UsernameState.Set::new).orElse(UsernameState.NoUsername.INSTANCE);
     binding.usernameText.setText(usernameState.getNickname());
@@ -142,15 +163,82 @@ public class UsernameEditFragment extends LoggingFragment {
   }
 
   private void onUiStateChanged(@NonNull UsernameEditViewModel.State state) {
-    EditText                       usernameInput        = binding.usernameText;
+    TextInputLayout usernameInputWrapper = binding.usernameTextWrapper;
+
+    presentSuffix(state.getUsername());
+    presentButtonState(state.getButtonState());
+
+    switch (state.getUsernameStatus()) {
+      case NONE:
+        usernameInputWrapper.setError(null);
+        break;
+      case TOO_SHORT:
+      case TOO_LONG:
+        usernameInputWrapper.setError(getResources().getString(R.string.UsernameEditFragment_usernames_must_be_between_a_and_b_characters, UsernameUtil.MIN_LENGTH, UsernameUtil.MAX_LENGTH));
+        usernameInputWrapper.setErrorTextColor(ColorStateList.valueOf(getResources().getColor(R.color.signal_colorError)));
+
+        break;
+      case INVALID_CHARACTERS:
+        usernameInputWrapper.setError(getResources().getString(R.string.UsernameEditFragment_usernames_can_only_include));
+        usernameInputWrapper.setErrorTextColor(ColorStateList.valueOf(getResources().getColor(R.color.signal_colorError)));
+
+        break;
+      case CANNOT_START_WITH_NUMBER:
+        usernameInputWrapper.setError(getResources().getString(R.string.UsernameEditFragment_usernames_cannot_begin_with_a_number));
+        usernameInputWrapper.setErrorTextColor(ColorStateList.valueOf(getResources().getColor(R.color.signal_colorError)));
+
+        break;
+      case INVALID_GENERIC:
+        usernameInputWrapper.setError(getResources().getString(R.string.UsernameEditFragment_username_is_invalid));
+        usernameInputWrapper.setErrorTextColor(ColorStateList.valueOf(getResources().getColor(R.color.signal_colorError)));
+
+        break;
+      case TAKEN:
+        usernameInputWrapper.setError(getResources().getString(R.string.UsernameEditFragment_this_username_is_taken));
+        usernameInputWrapper.setErrorTextColor(ColorStateList.valueOf(getResources().getColor(R.color.signal_colorError)));
+
+        break;
+    }
+  }
+
+  private void presentButtonState(@NonNull UsernameEditViewModel.ButtonState buttonState) {
+    if (args.getIsInRegistration()) {
+      presentRegistrationButtonState(buttonState);
+    } else {
+      presentProfileUpdateButtonState(buttonState);
+    }
+  }
+
+  private void presentRegistrationButtonState(@NonNull UsernameEditViewModel.ButtonState buttonState) {
+    binding.usernameText.setEnabled(true);
+    binding.usernameProgressCard.setVisibility(View.GONE);
+
+    switch (buttonState) {
+      case SUBMIT:
+        binding.usernameDoneButton.setEnabled(true);
+        binding.usernameDoneButton.setAlpha(1f);
+        break;
+      case SUBMIT_DISABLED:
+        binding.usernameDoneButton.setEnabled(false);
+        binding.usernameDoneButton.setAlpha(DISABLED_ALPHA);
+        break;
+      case SUBMIT_LOADING:
+        binding.usernameDoneButton.setEnabled(false);
+        binding.usernameDoneButton.setAlpha(DISABLED_ALPHA);
+        binding.usernameProgressCard.setVisibility(View.VISIBLE);
+        break;
+      default:
+        throw new IllegalStateException("Delete functionality is not available during registration.");
+    }
+  }
+
+  private void presentProfileUpdateButtonState(@NonNull UsernameEditViewModel.ButtonState buttonState) {
     CircularProgressMaterialButton submitButton         = binding.usernameSubmitButton;
     CircularProgressMaterialButton deleteButton         = binding.usernameDeleteButton;
-    TextInputLayout                usernameInputWrapper = binding.usernameTextWrapper;
+    EditText                       usernameInput        = binding.usernameText;
 
     usernameInput.setEnabled(true);
-    presentSuffix(state.getUsername());
-
-    switch (state.getButtonState()) {
+    switch (buttonState) {
       case SUBMIT:
         submitButton.cancelSpinning();
         submitButton.setVisibility(View.VISIBLE);
@@ -194,38 +282,6 @@ public class UsernameEditFragment extends LoggingFragment {
         usernameInput.setEnabled(false);
         break;
     }
-
-    switch (state.getUsernameStatus()) {
-      case NONE:
-        usernameInputWrapper.setError(null);
-        break;
-      case TOO_SHORT:
-      case TOO_LONG:
-        usernameInputWrapper.setError(getResources().getString(R.string.UsernameEditFragment_usernames_must_be_between_a_and_b_characters, UsernameUtil.MIN_LENGTH, UsernameUtil.MAX_LENGTH));
-        usernameInputWrapper.setErrorTextColor(ColorStateList.valueOf(getResources().getColor(R.color.signal_colorError)));
-
-        break;
-      case INVALID_CHARACTERS:
-        usernameInputWrapper.setError(getResources().getString(R.string.UsernameEditFragment_usernames_can_only_include));
-        usernameInputWrapper.setErrorTextColor(ColorStateList.valueOf(getResources().getColor(R.color.signal_colorError)));
-
-        break;
-      case CANNOT_START_WITH_NUMBER:
-        usernameInputWrapper.setError(getResources().getString(R.string.UsernameEditFragment_usernames_cannot_begin_with_a_number));
-        usernameInputWrapper.setErrorTextColor(ColorStateList.valueOf(getResources().getColor(R.color.signal_colorError)));
-
-        break;
-      case INVALID_GENERIC:
-        usernameInputWrapper.setError(getResources().getString(R.string.UsernameEditFragment_username_is_invalid));
-        usernameInputWrapper.setErrorTextColor(ColorStateList.valueOf(getResources().getColor(R.color.signal_colorError)));
-
-        break;
-      case TAKEN:
-        usernameInputWrapper.setError(getResources().getString(R.string.UsernameEditFragment_this_username_is_taken));
-        usernameInputWrapper.setErrorTextColor(ColorStateList.valueOf(getResources().getColor(R.color.signal_colorError)));
-
-        break;
-    }
   }
 
   private void presentSuffix(@NonNull UsernameState usernameState) {
@@ -257,7 +313,7 @@ public class UsernameEditFragment extends LoggingFragment {
     switch (event) {
       case SUBMIT_SUCCESS:
         ResultContract.setUsernameCreated(getParentFragmentManager());
-        NavHostFragment.findNavController(this).popBackStack();
+        closeScreen();
         break;
       case SUBMIT_FAIL_TAKEN:
         Toast.makeText(requireContext(), R.string.UsernameEditFragment_this_username_is_taken, Toast.LENGTH_SHORT).show();
@@ -272,6 +328,36 @@ public class UsernameEditFragment extends LoggingFragment {
       case NETWORK_FAILURE:
         Toast.makeText(requireContext(), R.string.UsernameEditFragment_encountered_a_network_error, Toast.LENGTH_SHORT).show();
         break;
+      case SKIPPED:
+        closeScreen();
+        break;
+    }
+  }
+
+  private void closeScreen() {
+    if (args.getIsInRegistration()) {
+      finishAndStartNextIntent();
+    } else {
+      NavHostFragment.findNavController(this).popBackStack();
+    }
+  }
+
+  private void finishAndStartNextIntent() {
+    FragmentActivity activity       = requireActivity();
+    boolean          didLaunch      = false;
+    Intent           activityIntent = activity.getIntent();
+
+    if (activityIntent != null) {
+      Intent nextIntent = activityIntent.getParcelableExtra(PassphraseRequiredActivity.NEXT_INTENT_EXTRA);
+      if (nextIntent != null) {
+        activity.startActivity(nextIntent);
+        activity.finish();
+        didLaunch = true;
+      }
+    }
+
+    if (!didLaunch) {
+      activity.finish();
     }
   }
 

app/src/main/java/org/thoughtcrime/securesms/profiles/manage/UsernameEditViewModel.java

@@ -8,6 +8,7 @@ import androidx.lifecycle.ViewModel;
 import androidx.lifecycle.ViewModelProvider;
 
 import org.signal.core.util.ThreadUtil;
+import org.thoughtcrime.securesms.keyvalue.SignalStore;
 import org.thoughtcrime.securesms.recipients.Recipient;
 import org.thoughtcrime.securesms.util.SingleLiveEvent;
 import org.thoughtcrime.securesms.util.UsernameUtil;
@@ -45,13 +46,15 @@ class UsernameEditViewModel extends ViewModel {
   private final RxStore<State>           uiState;
   private final PublishProcessor<String> nicknamePublisher;
   private final CompositeDisposable      disposables;
+  private final boolean                  isInRegistration;
 
-  private UsernameEditViewModel() {
+  private UsernameEditViewModel(boolean isInRegistration) {
     this.repo              = new UsernameEditRepository();
     this.uiState           = new RxStore<>(new State(ButtonState.SUBMIT_DISABLED, UsernameStatus.NONE, Recipient.self().getUsername().<UsernameState>map(UsernameState.Set::new).orElse(UsernameState.NoUsername.INSTANCE)), Schedulers.computation());
     this.events            = new SingleLiveEvent<>();
     this.nicknamePublisher = PublishProcessor.create();
     this.disposables       = new CompositeDisposable();
+    this.isInRegistration  = isInRegistration;
 
     Disposable disposable = nicknamePublisher.debounce(NICKNAME_PUBLISHER_DEBOUNCE_TIMEOUT_MILLIS, TimeUnit.MILLISECONDS)
                                              .subscribe(this::onNicknameChanged);
@@ -67,7 +70,7 @@ class UsernameEditViewModel extends ViewModel {
   void onNicknameUpdated(@NonNull String nickname) {
     uiState.update(state -> {
       if (TextUtils.isEmpty(nickname) && Recipient.self().getUsername().isPresent()) {
-        return new State(ButtonState.DELETE, UsernameStatus.NONE, UsernameState.NoUsername.INSTANCE);
+        return new State(isInRegistration ? ButtonState.SUBMIT_DISABLED : ButtonState.DELETE, UsernameStatus.NONE, UsernameState.NoUsername.INSTANCE);
       }
 
       Optional<InvalidReason> invalidReason = UsernameUtil.checkUsername(nickname);
@@ -79,6 +82,11 @@ class UsernameEditViewModel extends ViewModel {
     nicknamePublisher.onNext(nickname);
   }
 
+  void onUsernameSkipped() {
+    SignalStore.uiHints().markHasSetOrSkippedUsernameCreation();
+    events.setValue(Event.SKIPPED);
+  }
+
   void onUsernameSubmitted() {
     UsernameState usernameState = uiState.getState().getUsername();
 
@@ -107,6 +115,7 @@ class UsernameEditViewModel extends ViewModel {
 
         switch (result) {
           case SUCCESS:
+            SignalStore.uiHints().markHasSetOrSkippedUsernameCreation();
             uiState.update(state -> new State(ButtonState.SUBMIT_DISABLED, UsernameStatus.NONE, state.usernameState));
             events.postValue(Event.SUBMIT_SUCCESS);
             break;
@@ -248,14 +257,21 @@ class UsernameEditViewModel extends ViewModel {
   }
 
   enum Event {
-    NETWORK_FAILURE, SUBMIT_SUCCESS, DELETE_SUCCESS, SUBMIT_FAIL_INVALID, SUBMIT_FAIL_TAKEN
+    NETWORK_FAILURE, SUBMIT_SUCCESS, DELETE_SUCCESS, SUBMIT_FAIL_INVALID, SUBMIT_FAIL_TAKEN, SKIPPED
   }
 
   static class Factory extends ViewModelProvider.NewInstanceFactory {
+
+    private final boolean isInRegistration;
+
+    Factory(boolean isInRegistration) {
+      this.isInRegistration = isInRegistration;
+    }
+
     @Override
     public @NonNull <T extends ViewModel> T create(@NonNull Class<T> modelClass) {
       //noinspection ConstantConditions
-      return modelClass.cast(new UsernameEditViewModel());
+      return modelClass.cast(new UsernameEditViewModel(isInRegistration));
     }
   }
 }

app/src/main/java/org/thoughtcrime/securesms/profiles/username/AddAUsernameActivity.kt

@@ -0,0 +1,37 @@
+package org.thoughtcrime.securesms.profiles.username
+
+import android.os.Bundle
+import androidx.navigation.fragment.NavHostFragment
+import org.thoughtcrime.securesms.BaseActivity
+import org.thoughtcrime.securesms.R
+import org.thoughtcrime.securesms.profiles.manage.UsernameEditFragmentArgs
+import org.thoughtcrime.securesms.util.DynamicNoActionBarTheme
+import org.thoughtcrime.securesms.util.DynamicTheme
+
+class AddAUsernameActivity : BaseActivity() {
+  protected open val dynamicTheme: DynamicTheme = DynamicNoActionBarTheme()
+  protected open val contentViewId: Int = R.layout.fragment_container
+
+  override fun onCreate(savedInstanceState: Bundle?) {
+    super.onCreate(savedInstanceState)
+    setContentView(contentViewId)
+    dynamicTheme.onCreate(this)
+
+    if (savedInstanceState == null) {
+      supportFragmentManager.beginTransaction()
+        .replace(
+          R.id.fragment_container,
+          NavHostFragment.create(
+            R.navigation.create_username,
+            UsernameEditFragmentArgs.Builder().setIsInRegistration(true).build().toBundle()
+          )
+        )
+        .commit()
+    }
+  }
+
+  override fun onResume() {
+    super.onResume()
+    dynamicTheme.onResume(this)
+  }
+}