Add view model for setup process, add setup explainer fragment

briar-android/src/main/java/org/briarproject/briar/android/activity/ActivityComponent.java

@@ -80,6 +80,7 @@ import org.briarproject.briar.android.sharing.ShareBlogFragment;
 import org.briarproject.briar.android.sharing.ShareForumActivity;
 import org.briarproject.briar.android.sharing.ShareForumFragment;
 import org.briarproject.briar.android.sharing.SharingModule;
+import org.briarproject.briar.android.socialbackup.SetupExplainerFragment;
 import org.briarproject.briar.android.socialbackup.recover.CustodianRecoveryModeExplainerFragment;
 import org.briarproject.briar.android.socialbackup.CustodianSelectorFragment;
 import org.briarproject.briar.android.socialbackup.DistributedBackupActivity;
@@ -306,4 +307,6 @@ public interface ActivityComponent {
 	void inject(OwnerRecoveryModeErrorFragment ownerRecoveryModeErrorFragment);
 
 	void inject(CustodianReturnShardErrorFragment custodianReturnShardErrorFragment);
+
+	void inject(SetupExplainerFragment setupExplainerFragment);
 }

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

@@ -23,6 +23,7 @@ import java.util.Collection;
 import javax.inject.Inject;
 
 import androidx.annotation.Nullable;
+import androidx.lifecycle.ViewModelProvider;
 
 import static java.util.Objects.requireNonNull;
 
@@ -32,6 +33,18 @@ public class CustodianSelectorFragment extends ContactSelectorFragment {
 
 	public static final String TAG = CustodianSelectorFragment.class.getName();
 
+	@Inject
+	ViewModelProvider.Factory viewModelFactory;
+
+	private SocialBackupSetupViewModel viewModel;
+
+	@Override
+	public void injectFragment(ActivityComponent component) {
+		component.inject(this);
+		viewModel = new ViewModelProvider(requireActivity(), viewModelFactory)
+				.get(SocialBackupSetupViewModel.class);
+	}
+
 	@Inject
 	CreateBackupController controller;
 
@@ -44,11 +57,6 @@ public class CustodianSelectorFragment extends ContactSelectorFragment {
 		return fragment;
 	}
 
-	@Override
-	public void injectFragment(ActivityComponent component) {
-		component.inject(this);
-	}
-
 	@Override
 	public void onCreate(@Nullable Bundle savedInstanceState) {
 		super.onCreate(savedInstanceState);

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

@@ -12,7 +12,9 @@ import org.briarproject.briar.android.activity.ActivityComponent;
 import org.briarproject.briar.android.activity.BriarActivity;
 import org.briarproject.briar.android.contactselection.ContactSelectorListener;
 import org.briarproject.briar.android.fragment.BaseFragment;
+import org.briarproject.briar.android.socialbackup.recover.CustodianReturnShardViewModel;
 import org.briarproject.briar.api.socialbackup.BackupMetadata;
+import org.briarproject.briar.api.socialbackup.SocialBackup;
 import org.briarproject.briar.api.socialbackup.SocialBackupManager;
 
 import java.util.Collection;
@@ -20,25 +22,22 @@ import java.util.List;
 
 import javax.inject.Inject;
 
+import androidx.lifecycle.ViewModelProvider;
+
 public class DistributedBackupActivity extends BriarActivity implements
 		BaseFragment.BaseFragmentListener, ContactSelectorListener,
-		ThresholdDefinedListener,
 		ShardsSentFragment.ShardsSentDismissedListener {
 
-	private Collection<ContactId> custodians;
+	private SocialBackupSetupViewModel viewModel;
 
 	@Inject
-	public SocialBackupManager socialBackupManager;
-
-	@Inject
-	public ContactManager contactManager;
-
-	@Inject
-	public DatabaseComponent db;
+	ViewModelProvider.Factory viewModelFactory;
 
 	@Override
 	public void injectActivity(ActivityComponent component) {
 		component.inject(this);
+		viewModel = new ViewModelProvider(this, viewModelFactory)
+				.get(SocialBackupSetupViewModel.class);
 	}
 
 	@Override
@@ -46,19 +45,13 @@ public class DistributedBackupActivity extends BriarActivity implements
 		super.onCreate(savedInstanceState);
 		setContentView(R.layout.activity_distributed_backup);
 
-		try {
-			db.transaction(false, txn -> {
-				BackupMetadata backupMetadata =
-						socialBackupManager.getBackupMetadata(txn);
-				if (backupMetadata == null) throw new DbException();
-				ExistingBackupFragment fragment =
-						ExistingBackupFragment.newInstance(backupMetadata);
-				showInitialFragment(fragment);
-			});
-		} catch (DbException e) {
-			// Check the number of contacts in the contacts list > 1
+		if (viewModel.haveExistingBackup()) {
+			ExistingBackupFragment fragment =
+					ExistingBackupFragment.newInstance();
+			showInitialFragment(fragment);
+		} else {
 			try {
-				if (contactManager.getContacts().size() < 2) {
+				if (!viewModel.haveEnoughContacts()) {
 					Toast.makeText(this,
 							R.string.social_backup_not_enough_contacts,
 							Toast.LENGTH_LONG).show();
@@ -70,9 +63,32 @@ public class DistributedBackupActivity extends BriarActivity implements
 						Toast.LENGTH_LONG).show();
 				finish();
 			}
-			CustodianSelectorFragment fragment =
-					CustodianSelectorFragment.newInstance();
-			showInitialFragment(fragment);
+			showInitialFragment(new SetupExplainerFragment());
+		}
+
+		viewModel.getState()
+				.observe(this, this::onStateChanged);
+	}
+
+	private void onStateChanged(SocialBackupSetupViewModel.State state) {
+		switch(state) {
+			case SUCCESS:
+				try {
+					viewModel.createBackup();
+					ShardsSentFragment fragment = new ShardsSentFragment();
+					showNextFragment(fragment);
+				} catch (DbException e) {
+					Toast.makeText(this,
+							"There was an error when creating the backup",
+							Toast.LENGTH_LONG).show();
+					finish();
+				}
+				break;
+			case CHOOSING_CUSTODIANS:
+				CustodianSelectorFragment fragment =
+						CustodianSelectorFragment.newInstance();
+				showNextFragment(fragment);
+				break;
 		}
 	}
 
@@ -81,32 +97,15 @@ public class DistributedBackupActivity extends BriarActivity implements
 		Toast.makeText(this,
 				String.format("Selected %d contacts", contacts.size()),
 				Toast.LENGTH_SHORT).show();
-		custodians = contacts;
+		viewModel.setCustodians(contacts);
 		ThresholdSelectorFragment fragment =
 				ThresholdSelectorFragment.newInstance(contacts.size());
 		showNextFragment(fragment);
 	}
 
-	@Override
-	public void thresholdDefined(int threshold) {
-		try {
-			db.transaction(false, txn -> {
-				socialBackupManager
-						.createBackup(txn, (List<ContactId>) custodians,
-								threshold);
-				ShardsSentFragment fragment = new ShardsSentFragment();
-				showNextFragment(fragment);
-			});
-		} catch (DbException e) {
-			Toast.makeText(this,
-					"There was an error when creating the backup",
-					Toast.LENGTH_LONG).show();
-			finish();
-		}
-	}
-
 	@Override
 	public void shardsSentDismissed() {
 		finish();
 	}
+
 }

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

@@ -16,8 +16,11 @@ import org.briarproject.briar.api.socialbackup.BackupMetadata;
 import java.util.ArrayList;
 import java.util.List;
 
+import javax.inject.Inject;
+
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
+import androidx.lifecycle.ViewModelProvider;
 
 public class ExistingBackupFragment extends BaseFragment {
 
@@ -25,9 +28,21 @@ public class ExistingBackupFragment extends BaseFragment {
 	private static final String CUSTODIANS = "custodians";
 	public static final String TAG = ExistingBackupFragment.class.getName();
 
-	public static ExistingBackupFragment newInstance(
-			BackupMetadata backupMetadata) {
+	@Inject
+	ViewModelProvider.Factory viewModelFactory;
+
+	private static SocialBackupSetupViewModel viewModel;
+
+	@Override
+	public void injectFragment(ActivityComponent component) {
+		component.inject(this);
+		viewModel = new ViewModelProvider(requireActivity(), viewModelFactory)
+				.get(SocialBackupSetupViewModel.class);
+	}
+
+	public static ExistingBackupFragment newInstance() {
 		Bundle bundle = new Bundle();
+		BackupMetadata backupMetadata = viewModel.getBackupMetadata();
 		List<Author> custodians = backupMetadata.getCustodians();
 		ArrayList custodianNames = new ArrayList();
 		for (Author custodian : custodians) {
@@ -85,9 +100,5 @@ public class ExistingBackupFragment extends BaseFragment {
 		return TAG;
 	}
 
-	@Override
-	public void injectFragment(ActivityComponent component) {
-		component.inject(this);
-	}
 
 }

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

@@ -0,0 +1,54 @@
+package org.briarproject.briar.android.socialbackup;
+
+import android.os.Bundle;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.Button;
+
+import org.briarproject.briar.R;
+import org.briarproject.briar.android.activity.ActivityComponent;
+import org.briarproject.briar.android.fragment.BaseFragment;
+
+import javax.inject.Inject;
+
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+import androidx.lifecycle.ViewModelProvider;
+
+public class SetupExplainerFragment extends BaseFragment {
+
+	public static final String TAG =
+			SetupExplainerFragment.class.getName();
+
+	@Inject
+	ViewModelProvider.Factory viewModelFactory;
+
+	private SocialBackupSetupViewModel viewModel;
+
+	@Override
+	public void injectFragment(ActivityComponent component) {
+		component.inject(this);
+		viewModel = new ViewModelProvider(requireActivity(), viewModelFactory)
+				.get(SocialBackupSetupViewModel.class);
+	}
+
+	@Nullable
+	@Override
+	public View onCreateView(@NonNull LayoutInflater inflater, @Nullable
+			ViewGroup container, @Nullable Bundle savedInstanceState) {
+		View view =
+				inflater.inflate(R.layout.fragment_social_backup_setup_explainer,
+						container, false);
+
+		Button button = view.findViewById(R.id.button);
+		button.setOnClickListener(e -> viewModel.onExplainerDismissed());
+		return view;
+	}
+
+	@Override
+	public String getUniqueTag() {
+		return TAG;
+	}
+}
+

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

@@ -0,0 +1,100 @@
+package org.briarproject.briar.android.socialbackup;
+
+import android.app.Application;
+
+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.DbException;
+import org.briarproject.briar.api.socialbackup.BackupMetadata;
+import org.briarproject.briar.api.socialbackup.SocialBackupManager;
+
+import java.util.Collection;
+import java.util.List;
+
+import javax.inject.Inject;
+
+import androidx.annotation.NonNull;
+import androidx.lifecycle.AndroidViewModel;
+import androidx.lifecycle.MutableLiveData;
+
+public class SocialBackupSetupViewModel extends AndroidViewModel {
+
+	private final SocialBackupManager socialBackupManager;
+	private final DatabaseComponent db;
+	private final ContactManager contactManager;
+	private BackupMetadata backupMetadata;
+	private Collection<ContactId> custodians;
+	private int threshold;
+
+
+	public enum State {
+		EXPLAINING,
+		CHOOSING_CUSTODIANS,
+		GETTING_THRESHOLD,
+		SUCCESS
+	}
+
+	private final MutableLiveData<State> state =
+			new MutableLiveData<>();
+
+	@Inject
+	public SocialBackupSetupViewModel(
+			@NonNull Application app,
+			DatabaseComponent db,
+			SocialBackupManager socialBackupManager,
+			ContactManager contactManager
+	) {
+		super(app);
+		this.socialBackupManager = socialBackupManager;
+		this.db = db;
+		this.contactManager = contactManager;
+	}
+
+	public boolean haveExistingBackup() {
+		try {
+			db.transaction(false, txn -> {
+				backupMetadata =
+						socialBackupManager.getBackupMetadata(txn);
+				if (backupMetadata == null) throw new DbException();
+			});
+		} catch (DbException e) {
+			return false;
+		}
+		return true;
+	}
+
+	public BackupMetadata getBackupMetadata() {
+		return backupMetadata;
+	}
+
+    public boolean haveEnoughContacts() throws DbException {
+	    return (contactManager.getContacts().size() > 1);
+	}
+
+	public void setCustodians(Collection<ContactId> contacts) {
+		custodians = contacts;
+	}
+
+	public void createBackup() throws DbException {
+		db.transaction(false, txn -> {
+			socialBackupManager
+					.createBackup(txn, (List<ContactId>) custodians,
+							threshold);
+		});
+	}
+
+	public void setThreshold(int threshold) {
+		this.threshold = threshold;
+		state.postValue(State.SUCCESS);
+	}
+
+	public MutableLiveData<State> getState() {
+		return state;
+	}
+
+	public void onExplainerDismissed() {
+	    state.postValue(State.CHOOSING_CUSTODIANS);
+	}
+}
+

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

@@ -17,8 +17,11 @@ import org.briarproject.briar.android.activity.ActivityComponent;
 import org.briarproject.briar.android.fragment.BaseFragment;
 import org.magmacollective.darkcrystal.secretsharingwrapper.SecretSharingWrapper;
 
+import javax.inject.Inject;
+
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
+import androidx.lifecycle.ViewModelProvider;
 
 public class ThresholdSelectorFragment extends BaseFragment {
 
@@ -35,6 +38,18 @@ public class ThresholdSelectorFragment extends BaseFragment {
 	private TextView message;
 	private TextView mOfn;
 
+	@Inject
+	ViewModelProvider.Factory viewModelFactory;
+
+	private SocialBackupSetupViewModel viewModel;
+
+	@Override
+	public void injectFragment(ActivityComponent component) {
+		component.inject(this);
+		viewModel = new ViewModelProvider(requireActivity(), viewModelFactory)
+				.get(SocialBackupSetupViewModel.class);
+	}
+
 	public static ThresholdSelectorFragment newInstance(int numberCustodians) {
 		Bundle bundle = new Bundle();
 		bundle.putInt(NUMBER_CUSTODIANS, numberCustodians);
@@ -103,11 +118,6 @@ public class ThresholdSelectorFragment extends BaseFragment {
 		return TAG;
 	}
 
-	@Override
-	public void injectFragment(ActivityComponent component) {
-		component.inject(this);
-	}
-
 	@Override
 	public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
 		inflater.inflate(R.menu.define_threshold_actions, menu);
@@ -118,11 +128,7 @@ public class ThresholdSelectorFragment extends BaseFragment {
 	public boolean onOptionsItemSelected(MenuItem item) {
 		switch (item.getItemId()) {
 			case R.id.action_threshold_defined:
-				try {
-					listener.thresholdDefined(threshold);
-				} catch (DbException e) {
-					e.printStackTrace();
-				}
+				viewModel.setThreshold(threshold);
 				return true;
 			default:
 				return super.onOptionsItemSelected(item);

briar-android/src/main/java/org/briarproject/briar/android/socialbackup/recover/CustodianReturnShardViewModel.java

@@ -53,7 +53,7 @@ public class CustodianReturnShardViewModel extends AndroidViewModel
 	final QrCodeDecoder qrCodeDecoder;
 	private boolean qrCodeRead = false;
 	private WifiManager wifiManager;
-	private final MutableLiveEvent<Boolean > continueClicked = new MutableLiveEvent<>();
+	private final MutableLiveEvent<Boolean> continueClicked = new MutableLiveEvent<>();
 	private final MutableLiveEvent<Boolean> showCameraFragment =
 			new MutableLiveEvent<>();
 	private final MutableLiveEvent<Boolean> successDismissed =

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

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+	android:layout_width="match_parent"
+	android:layout_height="match_parent">
+
+</androidx.constraintlayout.widget.ConstraintLayout>