Improve existing backup fragment

briar-android/src/main/java/org/briarproject/briar/android/socialbackup/ExistingBackupFragment.java

@@ -2,32 +2,37 @@ package org.briarproject.briar.android.socialbackup;
 
 import android.content.Context;
 import android.os.Bundle;
+import android.text.Spannable;
+import android.text.SpannableStringBuilder;
+import android.text.style.ImageSpan;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
 import android.widget.TextView;
 
-import org.briarproject.bramble.api.db.DbException;
-import org.briarproject.bramble.api.identity.Author;
 import org.briarproject.briar.R;
 import org.briarproject.briar.android.activity.ActivityComponent;
+import org.briarproject.briar.android.contact.ContactListAdapter;
+import org.briarproject.briar.android.contact.ContactListItem;
+import org.briarproject.briar.android.contact.OnContactClickListener;
 import org.briarproject.briar.android.fragment.BaseFragment;
-import org.briarproject.briar.api.socialbackup.BackupMetadata;
+import org.briarproject.briar.android.view.BriarRecyclerView;
 
-import java.util.ArrayList;
-import java.util.List;
+import java.util.Arrays;
 
 import javax.inject.Inject;
 
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
 import androidx.lifecycle.ViewModelProvider;
+import androidx.recyclerview.widget.LinearLayoutManager;
 
-public class ExistingBackupFragment extends BaseFragment {
+public class ExistingBackupFragment extends BaseFragment implements
+		OnContactClickListener<ContactListItem> {
 
-	private static final String THRESHOLD = "threshold";
-	private static final String CUSTODIANS = "custodians";
 	public static final String TAG = ExistingBackupFragment.class.getName();
+	private final ContactListAdapter adapter = new ContactListAdapter(this);
+	private BriarRecyclerView list;
 
 	@Inject
 	ViewModelProvider.Factory viewModelFactory;
@@ -52,32 +57,42 @@ public class ExistingBackupFragment extends BaseFragment {
 	@Override
 	public View onCreateView(@NonNull LayoutInflater inflater, @Nullable
 			ViewGroup container, @Nullable Bundle savedInstanceState) {
+		// change toolbar text (relevant when navigating back to this fragment)
+		requireActivity().setTitle(R.string.social_backup_trusted_contacts);
+
 		View view = inflater.inflate(R.layout.fragment_existing_backup,
 				container, false);
-		BackupMetadata backupMetadata = viewModel.getBackupMetadata();
-		List<Author> custodians = backupMetadata.getCustodians();
+		viewModel.loadCustodianList();
+		list = view.findViewById(R.id.custodianList);
+		list.setLayoutManager(new LinearLayoutManager(getActivity()));
+		list.setAdapter(adapter);
+		list.setEmptyText(R.string.no_contacts);
 
-		StringBuilder custodianNamesString = new StringBuilder();
-		for (Author custodian : custodians) {
-			custodianNamesString
-					.append("• ")
-					.append(custodian.getName())
-					.append("\n");
-		}
+		viewModel.getContactListItems().observe(getViewLifecycleOwner(),
+				result -> result.onError(this::handleException)
+						.onSuccess(adapter::submitList)
+		);
 
-		TextView textViewThreshold = view.findViewById(R.id.textViewThreshold);
-		textViewThreshold.setText(getString(R.string.existing_backup_explain,
-				backupMetadata.getThreshold()));
-		TextView textViewCustodians =
-				view.findViewById(R.id.textViewCustodians);
-		textViewCustodians.setText(custodianNamesString);
+		int threshold = viewModel.getThresholdFromExistingBackup();
+		int numberOfCustodians =
+				viewModel.getNumberOfCustodiansFromExistingBackup();
+
+		TextView mOfn = view.findViewById(R.id.textViewThreshold);
+		mOfn.setText(String.format(
+				getString(R.string.threshold_m_of_n), threshold,
+				numberOfCustodians));
+
+		TextView thresholdRepresentation =
+				view.findViewById(R.id.textViewThresholdRepresentation);
+		thresholdRepresentation.setText(
+				buildThresholdRepresentationString(threshold,
+						numberOfCustodians));
 		return view;
 	}
 
 	@Override
 	public void onAttach(Context context) {
 		super.onAttach(context);
-//		listener = (ShardsSentDismissedListener) context;
 	}
 
 	@Override
@@ -85,4 +100,27 @@ public class ExistingBackupFragment extends BaseFragment {
 		return TAG;
 	}
 
+	@Override
+	public void onItemClick(View view, ContactListItem item) {
+	}
+
+	private SpannableStringBuilder buildThresholdRepresentationString(
+			int threshold, int numberOfCustodians) {
+		char[] charArray = new char[numberOfCustodians];
+		Arrays.fill(charArray, ' ');
+		SpannableStringBuilder string =
+				new SpannableStringBuilder(new String(charArray));
+
+		for (int i = 0; i < numberOfCustodians; i++) {
+			int drawable = i < threshold
+					? R.drawable.ic_custodian_required
+					: R.drawable.ic_custodian_optional;
+			string.setSpan(new ImageSpan(getContext(), drawable), i,
+					i + 1,
+					Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
+		}
+		// If we have more than 6, split it on two lines
+		if (numberOfCustodians > 6) string.insert(4, "\n");
+		return string;
+	}
 }

briar-android/src/main/java/org/briarproject/briar/android/socialbackup/SocialBackupSetupActivity.java

@@ -12,6 +12,7 @@ import org.briarproject.briar.android.contactselection.ContactSelectorListener;
 import org.briarproject.briar.android.fragment.BaseFragment;
 
 import java.util.Collection;
+import java.util.List;
 
 import javax.inject.Inject;
 
@@ -84,7 +85,7 @@ public class SocialBackupSetupActivity extends BriarActivity implements
 		Toast.makeText(this,
 				String.format("Selected %d contacts", contacts.size()),
 				Toast.LENGTH_SHORT).show();
-		viewModel.setCustodians(contacts);
+		viewModel.setCustodians((List<ContactId>) contacts);
 		ThresholdSelectorFragment fragment =
 				ThresholdSelectorFragment.newInstance(contacts.size());
 		showNextFragment(fragment);

briar-android/src/main/java/org/briarproject/briar/android/socialbackup/SocialBackupSetupViewModel.java

@@ -2,29 +2,37 @@ package org.briarproject.briar.android.socialbackup;
 
 import android.app.Application;
 
+import org.briarproject.bramble.api.connection.ConnectionRegistry;
 import org.briarproject.bramble.api.contact.ContactId;
 import org.briarproject.bramble.api.contact.ContactManager;
 import org.briarproject.bramble.api.db.DatabaseComponent;
+import org.briarproject.bramble.api.db.DatabaseExecutor;
 import org.briarproject.bramble.api.db.DbException;
+import org.briarproject.bramble.api.event.EventBus;
+import org.briarproject.bramble.api.lifecycle.LifecycleManager;
+import org.briarproject.bramble.api.system.AndroidExecutor;
+import org.briarproject.briar.android.contact.ContactsViewModel;
+import org.briarproject.briar.api.conversation.ConversationManager;
+import org.briarproject.briar.api.identity.AuthorManager;
 import org.briarproject.briar.api.socialbackup.BackupMetadata;
 import org.briarproject.briar.api.socialbackup.SocialBackupManager;
 
-import java.util.Collection;
+import java.util.ArrayList;
 import java.util.List;
+import java.util.concurrent.Executor;
 
 import javax.inject.Inject;
 
 import androidx.annotation.NonNull;
-import androidx.lifecycle.AndroidViewModel;
 import androidx.lifecycle.MutableLiveData;
 
-public class SocialBackupSetupViewModel extends AndroidViewModel {
+public class SocialBackupSetupViewModel extends ContactsViewModel {
 
 	private final SocialBackupManager socialBackupManager;
 	private final DatabaseComponent db;
 	private final ContactManager contactManager;
 	private BackupMetadata backupMetadata;
-	private Collection<ContactId> custodians;
+	private List<ContactId> custodians;
 	private int threshold;
 
 
@@ -38,20 +46,39 @@ public class SocialBackupSetupViewModel extends AndroidViewModel {
 
 	private final MutableLiveData<State> state =
 			new MutableLiveData<>();
-
 	@Inject
 	public SocialBackupSetupViewModel(
 			@NonNull Application app,
 			DatabaseComponent db,
+			@DatabaseExecutor Executor dbExecutor,
+			LifecycleManager lifecycleManager,
+			AuthorManager authorManager,
+			ConversationManager conversationManager,
+			ConnectionRegistry connectionRegistry,
+			EventBus eventBus,
+			AndroidExecutor androidExecutor,
 			SocialBackupManager socialBackupManager,
 			ContactManager contactManager
 	) {
-		super(app);
+		super(app, dbExecutor, lifecycleManager, db, androidExecutor,
+				contactManager, authorManager, conversationManager,
+				connectionRegistry, eventBus);
+
 		this.socialBackupManager = socialBackupManager;
 		this.db = db;
 		this.contactManager = contactManager;
 	}
 
+    public void loadCustodianList() {
+	    try {
+		    custodians = db.transactionWithResult(true,
+				    socialBackupManager::getCustodianContactIds);
+	    } catch (DbException e) {
+	    	custodians = new ArrayList<>();
+	    }
+	    loadContacts();
+    }
+
 	public boolean haveExistingBackup() {
 		try {
 			backupMetadata = db.transactionWithNullableResult(true,
@@ -62,15 +89,15 @@ public class SocialBackupSetupViewModel extends AndroidViewModel {
 		return (backupMetadata != null);
 	}
 
-	public BackupMetadata getBackupMetadata() {
-		return backupMetadata;
-	}
+//	public BackupMetadata getBackupMetadata() {
+//		return backupMetadata;
+//	}
 
 	public boolean haveEnoughContacts() throws DbException {
 		return (contactManager.getContacts().size() > 1);
 	}
 
-	public void setCustodians(Collection<ContactId> contacts) {
+	public void setCustodians(List<ContactId> contacts) {
 		custodians = contacts;
 	}
 
@@ -102,5 +129,19 @@ public class SocialBackupSetupViewModel extends AndroidViewModel {
 	public void onExplainerDismissed() {
 		state.postValue(State.CHOOSING_CUSTODIANS);
 	}
+
+	@Override
+	protected boolean displayContact(ContactId contactId) {
+		// Check if contact holds a backup piece
+		return custodians.contains(contactId);
+	}
+
+	public int getThresholdFromExistingBackup() {
+		return backupMetadata.getThreshold();
+	}
+
+	public int getNumberOfCustodiansFromExistingBackup() {
+		return backupMetadata.getCustodians().size();
+	}
 }
 

briar-android/src/main/java/org/briarproject/briar/android/socialbackup/ThresholdSelectorFragment.java

@@ -123,7 +123,6 @@ public class ThresholdSelectorFragment extends BaseFragment {
 		super.onAttach(context);
 	}
 
-
 	@Override
 	public String getUniqueTag() {
 		return TAG;

briar-android/src/main/res/layout/fragment_existing_backup.xml

@@ -11,25 +11,35 @@
 	android:paddingBottom="@dimen/margin_medium"
 	android:layout_height="match_parent">
 
+
 	<TextView
-		android:id="@+id/textViewThreshold"
+		android:id="@+id/textViewThresholdRepresentation"
 		android:layout_width="wrap_content"
 		android:layout_height="wrap_content"
 		android:gravity="center"
-		android:text="placeholder threshold"
-		android:textSize="16sp"
+		android:textSize="64sp"
 		app:layout_constraintEnd_toEndOf="parent"
 		app:layout_constraintStart_toStartOf="parent"
 		app:layout_constraintTop_toTopOf="parent" />
 
 	<TextView
-		android:id="@+id/textViewCustodians"
+		android:id="@+id/textViewThreshold"
 		android:layout_width="wrap_content"
 		android:layout_height="wrap_content"
 		android:gravity="center"
-		android:text="@string/backup_done_info"
 		android:textSize="16sp"
 		app:layout_constraintEnd_toEndOf="parent"
 		app:layout_constraintStart_toStartOf="parent"
-		app:layout_constraintTop_toBottomOf="@+id/textViewThreshold" />
+		app:layout_constraintTop_toBottomOf="@+id/textViewThresholdRepresentation" />
+
+	<org.briarproject.briar.android.view.BriarRecyclerView
+		android:id="@+id/custodianList"
+		android:layout_width="match_parent"
+		android:layout_height="wrap_content"
+		android:layout_marginTop="24dp"
+		app:layout_constraintEnd_toEndOf="parent"
+		app:layout_constraintStart_toStartOf="parent"
+		app:layout_constraintTop_toBottomOf="@id/textViewThreshold"
+		app:scrollToEnd="false" />
+
 </androidx.constraintlayout.widget.ConstraintLayout>

briar-android/src/main/res/values/strings.xml

@@ -719,10 +719,6 @@
 	<string name="setup_new_account">Create new account</string>
 	<string name="setup_restore_account">Restore account from backup</string>
 
-	<!-- Symbols for visualising threshold values for social backup -->
-	<string name="filled_bullet">\u25CF</string>
-	<string name="linear_bullet">\u25CB</string>
-
 	<!-- activity names -->
 	<string name="activity_name_distributed_backup">Social Backup</string>
 	<string name="activity_name_restore_account">Restore Account</string>
@@ -738,4 +734,7 @@
 
 	<string name="social_backup_not_enough_contacts">To make a social backup, you need at least 2 contacts in your contacts list</string>
 	<string name="reading_contacts_error">There was an error reading your contacts list</string>
+
+	<!-- Display existing backup -->
+	<string name="social_backup_trusted_contacts">Trusted Contacts</string>
 </resources>