Render GV1->GV2 migration event.

app/src/main/java/org/thoughtcrime/securesms/groups/ui/GroupMemberListView.java

@@ -9,7 +9,10 @@ import androidx.annotation.Nullable;
 import androidx.recyclerview.widget.LinearLayoutManager;
 import androidx.recyclerview.widget.RecyclerView;
 
+import com.annimon.stream.Stream;
+
 import org.thoughtcrime.securesms.R;
+import org.thoughtcrime.securesms.recipients.Recipient;
 
 import java.util.List;
 
@@ -74,6 +77,10 @@ public final class GroupMemberListView extends RecyclerView {
     membersAdapter.updateData(recipients);
   }
 
+  public void setDisplayOnlyMembers(@NonNull List<Recipient> recipients) {
+    membersAdapter.updateData(Stream.of(recipients).map(r -> new GroupMemberEntry.FullMember(r, false)).toList());
+  }
+
   @Override
   protected void onMeasure(int widthSpec, int heightSpec) {
     if (maxHeight > 0) {

app/src/main/java/org/thoughtcrime/securesms/groups/ui/migration/GroupsV1MigrationBottomSheetDialogFragment.java

@@ -0,0 +1,79 @@
+package org.thoughtcrime.securesms.groups.ui.migration;
+
+import android.os.Bundle;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.TextView;
+
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+import androidx.fragment.app.DialogFragment;
+import androidx.fragment.app.FragmentManager;
+import androidx.lifecycle.ViewModelProviders;
+
+import com.google.android.material.bottomsheet.BottomSheetDialogFragment;
+
+import org.thoughtcrime.securesms.R;
+import org.thoughtcrime.securesms.groups.ui.GroupMemberListView;
+import org.thoughtcrime.securesms.recipients.Recipient;
+import org.thoughtcrime.securesms.recipients.RecipientId;
+import org.thoughtcrime.securesms.util.BottomSheetUtil;
+import org.thoughtcrime.securesms.util.ThemeUtil;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public final class GroupsV1MigrationBottomSheetDialogFragment extends BottomSheetDialogFragment {
+
+  private static final String KEY_PENDING = "pending";
+
+  private GroupsV1MigrationViewModel viewModel;
+  private GroupMemberListView        pendingList;
+  private TextView                   pendingTitle;
+
+  public static void showForLearnMore(@NonNull FragmentManager manager, @NonNull List<RecipientId> pendingRecipients) {
+    Bundle args = new Bundle();
+    args.putParcelableArrayList(KEY_PENDING, new ArrayList<>(pendingRecipients));
+
+    GroupsV1MigrationBottomSheetDialogFragment fragment = new GroupsV1MigrationBottomSheetDialogFragment();
+    fragment.setArguments(args);
+
+    fragment.show(manager, BottomSheetUtil.STANDARD_BOTTOM_SHEET_FRAGMENT_TAG);
+  }
+
+  @Override
+  public void onCreate(@Nullable Bundle savedInstanceState) {
+    setStyle(DialogFragment.STYLE_NORMAL,
+             ThemeUtil.isDarkTheme(requireContext()) ? R.style.Theme_Signal_RoundedBottomSheet
+                                                     : R.style.Theme_Signal_RoundedBottomSheet_Light);
+
+    super.onCreate(savedInstanceState);
+  }
+
+  @Override
+  public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
+    return inflater.inflate(R.layout.groupsv1_migration_learn_more_bottom_sheet, container, false);
+  }
+
+  @Override
+  public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
+    this.pendingTitle = view.findViewById(R.id.gv1_learn_more_pending_title);
+    this.pendingList  = view.findViewById(R.id.gv1_learn_more_pending_list);
+
+    List<RecipientId> pending = getArguments().containsKey(KEY_PENDING) ? getArguments().getParcelableArrayList(KEY_PENDING) : null;
+
+    this.viewModel = ViewModelProviders.of(this, new GroupsV1MigrationViewModel.Factory(pending)).get(GroupsV1MigrationViewModel.class);
+    viewModel.getPendingMembers().observe(getViewLifecycleOwner(), this::onPendingMembersChanged);
+  }
+
+  @Override
+  public void show(@NonNull FragmentManager manager, @Nullable String tag) {
+    BottomSheetUtil.show(manager, tag, this);
+  }
+
+  private void onPendingMembersChanged(@NonNull List<Recipient> pendingMembers) {
+    pendingTitle.setText(getResources().getQuantityText(R.plurals.GroupsV1MigrationLearnMore_these_members_will_need_to_accept_an_invite, pendingMembers.size()));
+    pendingList.setDisplayOnlyMembers(pendingMembers);
+  }
+}

app/src/main/java/org/thoughtcrime/securesms/groups/ui/migration/GroupsV1MigrationViewModel.java

@@ -0,0 +1,44 @@
+package org.thoughtcrime.securesms.groups.ui.migration;
+
+import androidx.annotation.NonNull;
+import androidx.lifecycle.LiveData;
+import androidx.lifecycle.MutableLiveData;
+import androidx.lifecycle.ViewModel;
+import androidx.lifecycle.ViewModelProvider;
+
+import org.thoughtcrime.securesms.recipients.Recipient;
+import org.thoughtcrime.securesms.recipients.RecipientId;
+import org.thoughtcrime.securesms.util.concurrent.SignalExecutors;
+
+import java.util.List;
+
+class GroupsV1MigrationViewModel extends ViewModel {
+
+  private final MutableLiveData<List<Recipient>> pendingMembers;
+
+  private GroupsV1MigrationViewModel(@NonNull List<RecipientId> pendingMembers) {
+    this.pendingMembers = new MutableLiveData<>();
+
+    SignalExecutors.BOUNDED.execute(() -> {
+      this.pendingMembers.postValue(Recipient.resolvedList(pendingMembers));
+    });
+  }
+
+  @NonNull LiveData<List<Recipient>> getPendingMembers() {
+    return pendingMembers;
+  }
+
+  static class Factory extends ViewModelProvider.NewInstanceFactory {
+
+    private final List<RecipientId> pendingMembers;
+
+    Factory(List<RecipientId> pendingMembers) {
+      this.pendingMembers = pendingMembers;
+    }
+
+    @Override
+    public @NonNull<T extends ViewModel> T create(@NonNull Class<T> modelClass) {
+      return modelClass.cast(new GroupsV1MigrationViewModel(pendingMembers));
+    }
+  }
+}