remember chat filter selection across rotations

app/src/main/java/im/conversations/android/IDs.java

@@ -4,12 +4,19 @@ import com.google.common.base.Preconditions;
 import com.google.common.io.BaseEncoding;
 import com.google.common.io.ByteSource;
 import java.io.IOException;
+import java.util.Random;
 import java.util.UUID;
 
 public class IDs {
 
+    private static final Random RANDOM = new Random();
+
     private static final long UUID_VERSION_MASK = 4 << 12;
 
+    public static int quickInt() {
+        return RANDOM.nextInt();
+    }
+
     public static String huge() {
         final var random = new byte[96];
         Conversations.SECURE_RANDOM.nextBytes(random);

app/src/main/java/im/conversations/android/database/dao/RosterDao.java

@@ -50,6 +50,7 @@ public abstract class RosterDao extends GroupDao {
         deleteEmptyGroups();
     }
 
+    @Transaction
     public void update(
             final Account account, final String version, final Collection<Item> updates) {
         for (final Item item : updates) {

app/src/main/java/im/conversations/android/database/model/AccountIdentifier.java

@@ -31,6 +31,7 @@ public class AccountIdentifier implements ChatFilter {
     }
 
     @Override
+    @NonNull
     public String toString() {
         return MoreObjects.toStringHelper(this).add("id", id).add("address", address).toString();
     }

app/src/main/java/im/conversations/android/database/model/GroupIdentifier.java

@@ -1,6 +1,8 @@
 package im.conversations.android.database.model;
 
+import androidx.annotation.NonNull;
 import com.google.common.base.MoreObjects;
+import com.google.common.base.Objects;
 
 public class GroupIdentifier implements ChatFilter {
 
@@ -8,6 +10,7 @@ public class GroupIdentifier implements ChatFilter {
     public final String name;
 
     @Override
+    @NonNull
     public String toString() {
         return MoreObjects.toStringHelper(this).add("id", id).add("name", name).toString();
     }
@@ -16,4 +19,17 @@ public class GroupIdentifier implements ChatFilter {
         this.id = id;
         this.name = name;
     }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        GroupIdentifier that = (GroupIdentifier) o;
+        return id == that.id && Objects.equal(name, that.name);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hashCode(id, name);
+    }
 }

app/src/main/java/im/conversations/android/ui/fragment/main/OverviewFragment.java

@@ -3,6 +3,7 @@ package im.conversations.android.ui.fragment.main;
 import android.content.Intent;
 import android.os.Bundle;
 import android.view.LayoutInflater;
+import android.view.Menu;
 import android.view.MenuItem;
 import android.view.View;
 import android.view.ViewGroup;
@@ -13,6 +14,7 @@ import androidx.fragment.app.Fragment;
 import androidx.lifecycle.ViewModelProvider;
 import com.google.android.material.elevation.SurfaceColors;
 import com.google.android.material.search.SearchView;
+import im.conversations.android.IDs;
 import im.conversations.android.R;
 import im.conversations.android.database.model.AccountIdentifier;
 import im.conversations.android.database.model.ChatFilter;
@@ -59,7 +61,9 @@ public class OverviewFragment extends Fragment {
                     }
                 });
         binding.navigationView.setNavigationItemSelectedListener(this::onNavigationItemSelected);
+        if (this.overviewViewModel.getChatFilter() == null) {
             binding.navigationView.setCheckedItem(R.id.chats);
+        }
         this.overviewViewModel
                 .getAccounts()
                 .observe(getViewLifecycleOwner(), this::onAccountsUpdated);
@@ -117,14 +121,18 @@ public class OverviewFragment extends Fragment {
             menuItemSpaces.setVisible(false);
             return;
         }
+        final var chatFilter = this.overviewViewModel.getChatFilter();
         menuItemSpaces.setVisible(true);
         final var subMenu = menuItemSpaces.getSubMenu();
         subMenu.clear();
         for (final GroupIdentifier group : groups) {
-            final var menuItemSpace = subMenu.add(group.name);
+            final var menuItemSpace = subMenu.add(Menu.NONE, IDs.quickInt(), Menu.NONE, group.name);
             menuItemSpace.setCheckable(true);
             menuItemSpace.setIcon(R.drawable.ic_workspaces_24dp);
             menuItemSpace.setIntent(Intents.of(group));
+            if (group.equals(chatFilter)) {
+                this.binding.navigationView.setCheckedItem(menuItemSpace);
+            }
         }
     }
 
@@ -135,14 +143,19 @@ public class OverviewFragment extends Fragment {
             menuItemAccounts.setVisible(false);
             return;
         }
+        final var chatFilter = this.overviewViewModel.getChatFilter();
         menuItemAccounts.setVisible(true);
         final var subMenu = menuItemAccounts.getSubMenu();
         subMenu.clear();
         for (final AccountIdentifier account : accounts) {
-            final var menuItemAccount = subMenu.add(account.address);
+            final var menuItemAccount =
+                    subMenu.add(Menu.NONE, IDs.quickInt(), Menu.NONE, account.address);
             menuItemAccount.setCheckable(true);
             menuItemAccount.setIcon(R.drawable.ic_person_24dp);
             menuItemAccount.setIntent(Intents.of(account));
+            if (account.equals(chatFilter)) {
+                this.binding.navigationView.setCheckedItem(menuItemAccount);
+            }
         }
     }
 }

app/src/main/java/im/conversations/android/ui/model/OverviewViewModel.java

@@ -46,12 +46,11 @@ public class OverviewViewModel extends AndroidViewModel {
     }
 
     public LiveData<List<AccountIdentifier>> getAccounts() {
-        return Transformations.distinctUntilChanged(this.accountRepository.getAccounts());
+        return Transformations.distinctUntilChanged(this.accounts);
     }
 
-    // TODO change into GroupIdentifier
     public LiveData<List<GroupIdentifier>> getGroups() {
-        return Transformations.distinctUntilChanged(this.chatRepository.getGroups());
+        return Transformations.distinctUntilChanged(this.groups);
     }
 
     public LiveData<Boolean> getChatFilterAvailable() {