]> git.ktnx.net Git - mobile-ledger-staging.git/blobdiff - app/src/main/java/net/ktnx/mobileledger/ui/activity/MainActivity.java
fix setup of theme when the last profile was removed
[mobile-ledger-staging.git] / app / src / main / java / net / ktnx / mobileledger / ui / activity / MainActivity.java
index 8c573210d59980d08cf7d433193707fd3f3e6776..c66f43c489a98328556edd196dcdec6580b92852 100644 (file)
@@ -1,5 +1,5 @@
 /*
- * Copyright © 2019 Damyan Ivanov.
+ * Copyright © 2020 Damyan Ivanov.
  * This file is part of MoLe.
  * MoLe is free software: you can distribute it and/or modify it
  * under the term of the GNU General Public License as published by
@@ -24,166 +24,154 @@ import android.content.pm.ShortcutManager;
 import android.content.res.ColorStateList;
 import android.graphics.Color;
 import android.graphics.drawable.Icon;
-import android.os.AsyncTask;
 import android.os.Build;
 import android.os.Bundle;
+import android.text.format.DateUtils;
 import android.util.Log;
 import android.view.View;
-import android.view.ViewGroup;
-import android.view.ViewPropertyAnimator;
-import android.view.animation.Animation;
 import android.view.animation.AnimationUtils;
 import android.widget.LinearLayout;
 import android.widget.ProgressBar;
 import android.widget.TextView;
-import android.widget.Toast;
+
+import androidx.annotation.NonNull;
+import androidx.appcompat.app.ActionBarDrawerToggle;
+import androidx.appcompat.widget.Toolbar;
+import androidx.core.view.GravityCompat;
+import androidx.drawerlayout.widget.DrawerLayout;
+import androidx.fragment.app.Fragment;
+import androidx.fragment.app.FragmentManager;
+import androidx.fragment.app.FragmentPagerAdapter;
+import androidx.lifecycle.ViewModelProvider;
+import androidx.recyclerview.widget.LinearLayoutManager;
+import androidx.recyclerview.widget.RecyclerView;
+import androidx.viewpager.widget.ViewPager;
 
 import com.google.android.material.floatingactionbutton.FloatingActionButton;
+import com.google.android.material.snackbar.Snackbar;
 
 import net.ktnx.mobileledger.R;
-import net.ktnx.mobileledger.async.DbOpQueue;
-import net.ktnx.mobileledger.async.RefreshDescriptionsTask;
 import net.ktnx.mobileledger.async.RetrieveTransactionsTask;
 import net.ktnx.mobileledger.model.Data;
-import net.ktnx.mobileledger.model.LedgerAccount;
 import net.ktnx.mobileledger.model.MobileLedgerProfile;
-import net.ktnx.mobileledger.ui.account_summary.AccountSummaryAdapter;
+import net.ktnx.mobileledger.ui.MainModel;
 import net.ktnx.mobileledger.ui.account_summary.AccountSummaryFragment;
-import net.ktnx.mobileledger.ui.account_summary.AccountSummaryViewModel;
 import net.ktnx.mobileledger.ui.profiles.ProfileDetailFragment;
 import net.ktnx.mobileledger.ui.profiles.ProfilesRecyclerViewAdapter;
 import net.ktnx.mobileledger.ui.transaction_list.TransactionListFragment;
-import net.ktnx.mobileledger.ui.transaction_list.TransactionListViewModel;
 import net.ktnx.mobileledger.utils.Colors;
-import net.ktnx.mobileledger.utils.LockHolder;
+import net.ktnx.mobileledger.utils.Logger;
 import net.ktnx.mobileledger.utils.MLDB;
 
 import org.jetbrains.annotations.NotNull;
 
-import java.lang.ref.WeakReference;
-import java.text.DateFormat;
 import java.util.ArrayList;
 import java.util.Date;
 import java.util.List;
-import java.util.Observer;
+import java.util.Locale;
+import java.util.Objects;
 
-import androidx.appcompat.app.ActionBarDrawerToggle;
-import androidx.appcompat.widget.Toolbar;
-import androidx.core.view.GravityCompat;
-import androidx.drawerlayout.widget.DrawerLayout;
-import androidx.fragment.app.Fragment;
-import androidx.fragment.app.FragmentManager;
-import androidx.fragment.app.FragmentPagerAdapter;
-import androidx.recyclerview.widget.LinearLayoutManager;
-import androidx.recyclerview.widget.RecyclerView;
-import androidx.viewpager.widget.ViewPager;
-
-import static net.ktnx.mobileledger.utils.Logger.debug;
+/*
+ * TODO: reports
+ *  */
 
 public class MainActivity extends ProfileThemedActivity {
     public static final String STATE_CURRENT_PAGE = "current_page";
     public static final String BUNDLE_SAVED_STATE = "bundle_savedState";
     public static final String STATE_ACC_FILTER = "account_filter";
-    public AccountSummaryFragment mAccountSummaryFragment;
     DrawerLayout drawer;
-    private LinearLayout profileListContainer;
-    private View profileListHeadArrow, profileListHeadMore, profileListHeadCancel;
-    private FragmentManager fragmentManager;
-    private RetrieveTransactionsTask retrieveTransactionsTask;
+    private View profileListHeadMore, profileListHeadCancel, profileListHeadAddProfile;
     private View bTransactionListCancelDownload;
-    private ProgressBar progressBar;
-    private LinearLayout progressLayout;
     private SectionsPagerAdapter mSectionsPagerAdapter;
     private ViewPager mViewPager;
     private FloatingActionButton fab;
-    private boolean profileListExpanded = false;
     private ProfilesRecyclerViewAdapter mProfileListAdapter;
     private int mCurrentPage;
-    private String mAccountFilter;
     private boolean mBackMeansToAccountList = false;
-    private Observer profileObserver;
-    private Observer profilesObserver;
     private Toolbar mToolbar;
     private DrawerLayout.SimpleDrawerListener drawerListener;
     private ActionBarDrawerToggle barDrawerToggle;
     private ViewPager.SimpleOnPageChangeListener pageChangeListener;
-    private Observer editingProfilesObserver;
+    private MobileLedgerProfile profile;
+    private MainModel mainModel;
     @Override
     protected void onStart() {
         super.onStart();
 
-        debug("flow", "MainActivity.onStart()");
-        mViewPager.setCurrentItem(mCurrentPage, false);
-        if (mAccountFilter != null) showTransactionsFragment(mAccountFilter);
-        else Data.accountFilter.setValue(null);
+        Logger.debug("MainActivity", "onStart()");
 
+        mViewPager.setCurrentItem(mCurrentPage, false);
     }
     @Override
     protected void onSaveInstanceState(@NotNull Bundle outState) {
         super.onSaveInstanceState(outState);
         outState.putInt(STATE_CURRENT_PAGE, mViewPager.getCurrentItem());
-        if (mAccountFilter != null) outState.putString(STATE_ACC_FILTER, mAccountFilter);
+        if (mainModel.getAccountFilter()
+                     .getValue() != null)
+            outState.putString(STATE_ACC_FILTER, mainModel.getAccountFilter()
+                                                          .getValue());
     }
     @Override
     protected void onDestroy() {
         mSectionsPagerAdapter = null;
-        Data.profile.deleteObserver(profileObserver);
-        profileObserver = null;
-        Data.profiles.deleteObserver(profilesObserver);
-        profilesObserver = null;
         RecyclerView root = findViewById(R.id.nav_profile_list);
-        if (root != null) root.setAdapter(null);
-        if (drawer != null) drawer.removeDrawerListener(drawerListener);
+        if (root != null)
+            root.setAdapter(null);
+        if (drawer != null)
+            drawer.removeDrawerListener(drawerListener);
         drawerListener = null;
-        if (drawer != null) drawer.removeDrawerListener(barDrawerToggle);
+        if (drawer != null)
+            drawer.removeDrawerListener(barDrawerToggle);
         barDrawerToggle = null;
-        if (mViewPager != null) mViewPager.removeOnPageChangeListener(pageChangeListener);
+        if (mViewPager != null)
+            mViewPager.removeOnPageChangeListener(pageChangeListener);
         pageChangeListener = null;
-        if (mProfileListAdapter != null)
-            mProfileListAdapter.deleteEditingProfilesObserver(editingProfilesObserver);
-        editingProfilesObserver = null;
         super.onDestroy();
     }
     @Override
-    protected void onCreate(Bundle savedInstanceState) {
-        super.onCreate(savedInstanceState);
-        debug("flow", "MainActivity.onCreate()");
-        int profileColor = Data.retrieveCurrentThemeIdFromDb();
+    protected void setupProfileColors() {
+        final int profileColor = Data.retrieveCurrentThemeIdFromDb();
         Colors.setupTheme(this, profileColor);
         Colors.profileThemeId = profileColor;
+    }
+    @Override
+    protected void onResume() {
+        super.onResume();
+        fabShouldShow();
+    }
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        Logger.debug("MainActivity", "onCreate()/entry");
+        super.onCreate(savedInstanceState);
+        Logger.debug("MainActivity", "onCreate()/after super");
         setContentView(R.layout.activity_main);
 
+        mainModel = new ViewModelProvider(this).get(MainModel.class);
+
         fab = findViewById(R.id.btn_add_transaction);
-        profileListContainer = findViewById(R.id.nav_profile_list_container);
-        profileListHeadArrow = findViewById(R.id.nav_profiles_arrow);
         profileListHeadMore = findViewById(R.id.nav_profiles_start_edit);
         profileListHeadCancel = findViewById(R.id.nav_profiles_cancel_edit);
         LinearLayout profileListHeadMoreAndCancel =
                 findViewById(R.id.nav_profile_list_head_buttons);
+        profileListHeadAddProfile = findViewById(R.id.nav_new_profile_button);
         drawer = findViewById(R.id.drawer_layout);
         bTransactionListCancelDownload = findViewById(R.id.transaction_list_cancel_download);
-        progressBar = findViewById(R.id.transaction_list_progress_bar);
-        progressLayout = findViewById(R.id.transaction_progress_layout);
-        fragmentManager = getSupportFragmentManager();
-        mSectionsPagerAdapter = new SectionsPagerAdapter(fragmentManager);
+        mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager());
         mViewPager = findViewById(R.id.root_frame);
 
         Bundle extra = getIntent().getBundleExtra(BUNDLE_SAVED_STATE);
-        if (extra != null && savedInstanceState == null) savedInstanceState = extra;
+        if (extra != null && savedInstanceState == null)
+            savedInstanceState = extra;
 
 
         mToolbar = findViewById(R.id.toolbar);
         setSupportActionBar(mToolbar);
 
-        if (profileObserver == null) {
-            profileObserver = (o, arg) -> onProfileChanged(arg);
-            Data.profile.addObserver(profileObserver);
-        }
+        Data.observeProfile(this, this::onProfileChanged);
 
-        if (profilesObserver == null) {
-            profilesObserver = (o, arg) -> onProfileListChanged(arg);
-            Data.profiles.addObserver(profilesObserver);
-        }
+        Data.profiles.observe(this, this::onProfileListChanged);
+        Data.backgroundTaskProgress.observe(this, this::onRetrieveProgress);
+        Data.backgroundTasksRunning.observe(this, this::onRetrieveRunningChanged);
 
         if (barDrawerToggle == null) {
             barDrawerToggle = new ActionBarDrawerToggle(this, drawer, mToolbar,
@@ -192,22 +180,18 @@ public class MainActivity extends ProfileThemedActivity {
         }
         barDrawerToggle.syncState();
 
-        TextView ver = drawer.findViewById(R.id.drawer_version_text);
-
         try {
-            PackageInfo pi =
-                    getApplicationContext().getPackageManager().getPackageInfo(getPackageName(), 0);
-            ver.setText(pi.versionName);
+            PackageInfo pi = getApplicationContext().getPackageManager()
+                                                    .getPackageInfo(getPackageName(), 0);
+            ((TextView) findViewById(R.id.nav_upper).findViewById(
+                    R.id.drawer_version_text)).setText(pi.versionName);
+            ((TextView) findViewById(R.id.no_profiles_layout).findViewById(
+                    R.id.drawer_version_text)).setText(pi.versionName);
         }
         catch (Exception e) {
             e.printStackTrace();
         }
 
-        if (progressBar == null)
-            throw new RuntimeException("Can't get hold on the transaction value progress bar");
-        if (progressLayout == null) throw new RuntimeException(
-                "Can't get hold on the transaction value progress bar layout");
-
         markDrawerItemCurrent(R.id.nav_account_summary);
 
         mViewPager.setAdapter(mSectionsPagerAdapter);
@@ -216,6 +200,7 @@ public class MainActivity extends ProfileThemedActivity {
             pageChangeListener = new ViewPager.SimpleOnPageChangeListener() {
                 @Override
                 public void onPageSelected(int position) {
+                    mCurrentPage = position;
                     switch (position) {
                         case 0:
                             markDrawerItemCurrent(R.id.nav_account_summary);
@@ -240,52 +225,56 @@ public class MainActivity extends ProfileThemedActivity {
             if (currentPage != -1) {
                 mCurrentPage = currentPage;
             }
-            mAccountFilter = savedInstanceState.getString(STATE_ACC_FILTER, null);
+            mainModel.getAccountFilter()
+                     .setValue(savedInstanceState.getString(STATE_ACC_FILTER, null));
         }
-        else mAccountFilter = null;
-
-        Data.lastUpdateDate.observe(this, this::updateLastUpdateDisplay);
 
-        findViewById(R.id.btn_no_profiles_add)
-                .setOnClickListener(v -> startEditProfileActivity(null));
+        findViewById(R.id.btn_no_profiles_add).setOnClickListener(
+                v -> startEditProfileActivity(null));
 
         findViewById(R.id.btn_add_transaction).setOnClickListener(this::fabNewTransactionClicked);
 
-        findViewById(R.id.nav_new_profile_button)
-                .setOnClickListener(v -> startEditProfileActivity(null));
+        findViewById(R.id.nav_new_profile_button).setOnClickListener(
+                v -> startEditProfileActivity(null));
 
         RecyclerView root = findViewById(R.id.nav_profile_list);
         if (root == null)
             throw new RuntimeException("Can't get hold on the transaction value view");
 
-        if (mProfileListAdapter == null) mProfileListAdapter = new ProfilesRecyclerViewAdapter();
+        if (mProfileListAdapter == null)
+            mProfileListAdapter = new ProfilesRecyclerViewAdapter();
         root.setAdapter(mProfileListAdapter);
 
-        if (editingProfilesObserver == null) {
-            editingProfilesObserver = (o, arg) -> {
-                if (mProfileListAdapter.isEditingProfiles()) {
-                    profileListHeadMore.setVisibility(View.GONE);
-                    profileListHeadMore
-                            .startAnimation(AnimationUtils.loadAnimation(this, R.anim.fade_out));
-                    profileListHeadCancel.setVisibility(View.VISIBLE);
-                    profileListHeadCancel
-                            .startAnimation(AnimationUtils.loadAnimation(this, R.anim.fade_in));
+        mProfileListAdapter.editingProfiles.observe(this, newValue -> {
+            if (newValue) {
+                profileListHeadMore.setVisibility(View.GONE);
+                profileListHeadCancel.setVisibility(View.VISIBLE);
+                profileListHeadAddProfile.setVisibility(View.VISIBLE);
+                if (drawer.isDrawerOpen(GravityCompat.START)) {
+                    profileListHeadMore.startAnimation(
+                            AnimationUtils.loadAnimation(MainActivity.this, R.anim.fade_out));
+                    profileListHeadCancel.startAnimation(
+                            AnimationUtils.loadAnimation(MainActivity.this, R.anim.fade_in));
+                    profileListHeadAddProfile.startAnimation(
+                            AnimationUtils.loadAnimation(MainActivity.this, R.anim.fade_in));
                 }
-                else {
-                    profileListHeadCancel.setVisibility(View.GONE);
-                    profileListHeadCancel
-                            .startAnimation(AnimationUtils.loadAnimation(this, R.anim.fade_out));
-                    profileListHeadMore.setVisibility(View.GONE);
-                    if (profileListExpanded) {
-                        profileListHeadMore.setVisibility(View.VISIBLE);
-                        profileListHeadMore
-                                .startAnimation(AnimationUtils.loadAnimation(this, R.anim.fade_in));
-                    }
-                    else profileListHeadMore.setVisibility(View.GONE);
+            }
+            else {
+                profileListHeadCancel.setVisibility(View.GONE);
+                profileListHeadMore.setVisibility(View.VISIBLE);
+                profileListHeadAddProfile.setVisibility(View.GONE);
+                if (drawer.isDrawerOpen(GravityCompat.START)) {
+                    profileListHeadCancel.startAnimation(
+                            AnimationUtils.loadAnimation(MainActivity.this, R.anim.fade_out));
+                    profileListHeadMore.startAnimation(
+                            AnimationUtils.loadAnimation(MainActivity.this, R.anim.fade_in));
+                    profileListHeadAddProfile.startAnimation(
+                            AnimationUtils.loadAnimation(MainActivity.this, R.anim.fade_out));
                 }
-            };
-            mProfileListAdapter.addEditingProfilesObserver(editingProfilesObserver);
-        }
+            }
+
+            mProfileListAdapter.notifyDataSetChanged();
+        });
 
         LinearLayoutManager llm = new LinearLayoutManager(this);
 
@@ -294,219 +283,205 @@ public class MainActivity extends ProfileThemedActivity {
 
         profileListHeadMore.setOnClickListener((v) -> mProfileListAdapter.flipEditingProfiles());
         profileListHeadCancel.setOnClickListener((v) -> mProfileListAdapter.flipEditingProfiles());
-        profileListHeadMoreAndCancel
-                .setOnClickListener((v) -> mProfileListAdapter.flipEditingProfiles());
-
+        profileListHeadMoreAndCancel.setOnClickListener(
+                (v) -> mProfileListAdapter.flipEditingProfiles());
         if (drawerListener == null) {
             drawerListener = new DrawerLayout.SimpleDrawerListener() {
+                @Override
+                public void onDrawerSlide(@NonNull View drawerView, float slideOffset) {
+                    if (slideOffset > 0.2)
+                        fabHide();
+                }
                 @Override
                 public void onDrawerClosed(View drawerView) {
                     super.onDrawerClosed(drawerView);
-                    collapseProfileList();
+                    mProfileListAdapter.setAnimationsEnabled(false);
+                    mProfileListAdapter.editingProfiles.setValue(false);
+                    Data.drawerOpen.setValue(false);
+                    fabShouldShow();
+                }
+                @Override
+                public void onDrawerOpened(View drawerView) {
+                    super.onDrawerOpened(drawerView);
+                    mProfileListAdapter.setAnimationsEnabled(true);
+                    Data.drawerOpen.setValue(true);
+                    fabHide();
                 }
             };
             drawer.addDrawerListener(drawerListener);
         }
 
-        findViewById(R.id.nav_profile_list_head_layout)
-                .setOnClickListener(this::navProfilesHeadClicked);
-        findViewById(R.id.nav_profiles_label).setOnClickListener(this::navProfilesHeadClicked);
-        boolean initialStart = Data.profile.get() == null;
-        setupProfile();
-        if (!initialStart) onProfileChanged(null);
+        Data.drawerOpen.observe(this, open -> {
+            if (open)
+                drawer.open();
+            else
+                drawer.close();
+        });
 
-        updateLastUpdateTextFromDB();
-    }
-    private void scheduleDataRetrievalIfStale(Date lastUpdate) {
+        mainModel.getUpdateError()
+                 .observe(this, (error) -> {
+                     if (error == null)
+                         return;
+
+                     Snackbar.make(mViewPager, error, Snackbar.LENGTH_LONG)
+                             .show();
+                     mainModel.clearUpdateError();
+                 });
+        Data.locale.observe(this, l -> refreshLastUpdateInfo());
+        Data.lastUpdateDate.observe(this, date -> refreshLastUpdateInfo());
+        Data.lastUpdateTransactionCount.observe(this, date -> refreshLastUpdateInfo());
+        Data.lastUpdateAccountCount.observe(this, date -> refreshLastUpdateInfo());
+    }
+    private void scheduleDataRetrievalIfStale(long lastUpdate) {
         long now = new Date().getTime();
-        if ((lastUpdate == null) || (now > (lastUpdate.getTime() + (24 * 3600 * 1000)))) {
-            if (lastUpdate == null) debug("db::", "WEB data never fetched. scheduling a fetch");
-            else debug("db",
-                    String.format("WEB data last fetched at %1.3f and now is %1.3f. re-fetching",
-                            lastUpdate.getTime() / 1000f, now / 1000f));
+        if ((lastUpdate == 0) || (now > (lastUpdate + (24 * 3600 * 1000)))) {
+            if (lastUpdate == 0)
+                Logger.debug("db::", "WEB data never fetched. scheduling a fetch");
+            else
+                Logger.debug("db", String.format(Locale.ENGLISH,
+                        "WEB data last fetched at %1.3f and now is %1.3f. re-fetching",
+                        lastUpdate / 1000f, now / 1000f));
 
-            scheduleTransactionListRetrieval();
+            mainModel.scheduleTransactionListRetrieval();
         }
     }
-    private void createShortcuts() {
-        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.N) return;
+    private void createShortcuts(List<MobileLedgerProfile> list) {
+        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.N_MR1)
+            return;
 
+        ShortcutManager sm = getSystemService(ShortcutManager.class);
         List<ShortcutInfo> shortcuts = new ArrayList<>();
-        try (LockHolder ignored = Data.profiles.lockForReading()) {
-            for (int i = 0; i < Data.profiles.size(); i++) {
-                MobileLedgerProfile p = Data.profiles.get(i);
-                if (!p.isPostingPermitted()) continue;
-
-                ShortcutInfo si = new ShortcutInfo.Builder(this, "new_transaction_" + p.getUuid())
-                        .setShortLabel(p.getName())
-                        .setIcon(Icon.createWithResource(this, R.drawable.svg_thick_plus_white))
-                        .setIntent(new Intent(Intent.ACTION_VIEW, null, this,
-                                NewTransactionActivity.class).putExtra("profile_uuid", p.getUuid()))
-                        .setRank(i).build();
-                shortcuts.add(si);
-            }
+        int i = 0;
+        for (MobileLedgerProfile p : list) {
+            if (shortcuts.size() >= sm.getMaxShortcutCountPerActivity())
+                break;
+
+            if (!p.isPostingPermitted())
+                continue;
+
+            final ShortcutInfo.Builder builder =
+                    new ShortcutInfo.Builder(this, "new_transaction_" + p.getUuid());
+            ShortcutInfo si = builder.setShortLabel(p.getName())
+                                     .setIcon(Icon.createWithResource(this,
+                                             R.drawable.thick_plus_icon))
+                                     .setIntent(new Intent(Intent.ACTION_VIEW, null, this,
+                                             NewTransactionActivity.class).putExtra("profile_uuid",
+                                             p.getUuid()))
+                                     .setRank(i)
+                                     .build();
+            shortcuts.add(si);
+            i++;
         }
-        ShortcutManager sm = getSystemService(ShortcutManager.class);
         sm.setDynamicShortcuts(shortcuts);
     }
-    private void onProfileListChanged(Object arg) {
+    private void onProfileListChanged(List<MobileLedgerProfile> newList) {
+        if ((newList == null) || newList.isEmpty()) {
+            findViewById(R.id.no_profiles_layout).setVisibility(View.VISIBLE);
+            findViewById(R.id.main_app_layout).setVisibility(View.GONE);
+            return;
+        }
+
+        findViewById(R.id.main_app_layout).setVisibility(View.VISIBLE);
+        findViewById(R.id.no_profiles_layout).setVisibility(View.GONE);
+
         findViewById(R.id.nav_profile_list).setMinimumHeight(
-                (int) (getResources().getDimension(R.dimen.thumb_row_height) *
-                       Data.profiles.size()));
+                (int) (getResources().getDimension(R.dimen.thumb_row_height) * newList.size()));
 
-        debug("profiles", "profile list changed");
-        if (arg == null) mProfileListAdapter.notifyDataSetChanged();
-        else mProfileListAdapter.notifyItemChanged((int) arg);
+        Logger.debug("profiles", "profile list changed");
+        mProfileListAdapter.notifyDataSetChanged();
 
-        createShortcuts();
+        createShortcuts(newList);
     }
-    private void onProfileChanged(Object arg) {
-        MobileLedgerProfile profile = Data.profile.get();
-        MainActivity.this.runOnUiThread(() -> {
-
-            boolean haveProfile = profile != null;
-            findViewById(R.id.no_profiles_layout)
-                    .setVisibility(haveProfile ? View.GONE : View.VISIBLE);
-            findViewById(R.id.pager_layout)
-                    .setVisibility(haveProfile ? View.VISIBLE : View.VISIBLE);
-
-            if (profile == null) MainActivity.this.setTitle(R.string.app_name);
-            else MainActivity.this.setTitle(profile.getName());
-            MainActivity.this.updateLastUpdateTextFromDB();
-            int old_index = -1;
-            int new_index = -1;
-            if (arg != null) {
-                MobileLedgerProfile old = (MobileLedgerProfile) arg;
-                old_index = Data.getProfileIndex(old);
-                new_index = Data.getProfileIndex(profile);
-            }
-
-            if ((old_index != -1) && (new_index != -1)) {
-                mProfileListAdapter.notifyItemChanged(old_index);
-                mProfileListAdapter.notifyItemChanged(new_index);
-            }
-            else mProfileListAdapter.notifyDataSetChanged();
-
-            MainActivity.this.collapseProfileList();
-
-            int newProfileTheme = (profile == null) ? -1 : profile.getThemeId();
-            if (newProfileTheme != Colors.profileThemeId) {
-                debug("profiles", String.format("profile theme %d → %d", Colors.profileThemeId,
-                        newProfileTheme));
-                MainActivity.this.profileThemeChanged();
-                Colors.profileThemeId = newProfileTheme;
-                // profileThemeChanged would restart the activity, so no need to reload the
-                // data sets below
+    /**
+     * called when the current profile has changed
+     */
+    private void onProfileChanged(MobileLedgerProfile profile) {
+        if (this.profile == null) {
+            if (profile == null)
                 return;
-            }
-            drawer.closeDrawers();
+        }
+        else {
+            if (this.profile.equals(profile))
+                return;
+        }
+
+        boolean haveProfile = profile != null;
+
+        if (haveProfile)
+            setTitle(profile.getName());
+        else
+            setTitle(R.string.app_name);
+
+        mainModel.setProfile(profile);
 
-            Data.transactions.clear();
-            debug("transactions", "requesting list reload");
-            TransactionListViewModel.scheduleTransactionListReload();
+        this.profile = profile;
 
-            Data.accounts.clear();
-            AccountSummaryViewModel.scheduleAccountListReload();
+        int newProfileTheme = haveProfile ? profile.getThemeHue() : -1;
+        if (newProfileTheme != Colors.profileThemeId) {
+            Logger.debug("profiles",
+                    String.format(Locale.ENGLISH, "profile theme %d → %d", Colors.profileThemeId,
+                            newProfileTheme));
+            Colors.profileThemeId = newProfileTheme;
+            profileThemeChanged();
+            // profileThemeChanged would restart the activity, so no need to reload the
+            // data sets below
+            return;
+        }
+
+        findViewById(R.id.no_profiles_layout).setVisibility(haveProfile ? View.GONE : View.VISIBLE);
+        findViewById(R.id.pager_layout).setVisibility(haveProfile ? View.VISIBLE : View.VISIBLE);
+
+        mProfileListAdapter.notifyDataSetChanged();
+
+        mainModel.clearAccounts();
+        mainModel.clearTransactions();
+
+        if (haveProfile) {
+            mainModel.scheduleAccountListReload();
+            Logger.debug("transactions", "requesting list reload");
+            mainModel.scheduleTransactionListReload();
 
-            if (profile == null) {
+            if (profile.isPostingPermitted()) {
                 mToolbar.setSubtitle(null);
-                fab.hide();
+                fab.show();
             }
             else {
-                if (profile.isPostingPermitted()) {
-                    mToolbar.setSubtitle(null);
-                    fab.show();
-                }
-                else {
-                    mToolbar.setSubtitle(R.string.profile_subitlte_read_only);
-                    fab.hide();
-                }
+                mToolbar.setSubtitle(R.string.profile_subtitle_read_only);
+                fab.hide();
             }
-
-            updateLastUpdateTextFromDB();
-        });
-    }
-    private void updateLastUpdateDisplay(Date newValue) {
-        LinearLayout l = findViewById(R.id.transactions_last_update_layout);
-        TextView v = findViewById(R.id.transactions_last_update);
-        if (newValue == null) {
-            l.setVisibility(View.INVISIBLE);
-            debug("main", "no last update date :(");
         }
         else {
-            final String text = DateFormat.getDateTimeInstance().format(newValue);
-            v.setText(text);
-            l.setVisibility(View.VISIBLE);
-            debug("main", String.format("Date formatted: %s", text));
-        }
-
-        scheduleDataRetrievalIfStale(newValue);
-    }
-    @Override
-    public void finish() {
-        if (profilesObserver != null) {
-            Data.profiles.deleteObserver(profilesObserver);
-            profilesObserver = null;
+            mToolbar.setSubtitle(null);
+            fab.hide();
         }
 
-        if (profileObserver != null) {
-            Data.profile.deleteObserver(profileObserver);
-            profileObserver = null;
-        }
-
-        super.finish();
+        updateLastUpdateTextFromDB();
     }
     private void profileThemeChanged() {
-        setupProfileColors();
-
-        Bundle bundle = new Bundle();
-        onSaveInstanceState(bundle);
-        // restart activity to reflect theme change
-        finish();
-        Intent intent = new Intent(this, this.getClass());
-        intent.putExtra(BUNDLE_SAVED_STATE, bundle);
-        startActivity(intent);
+        // un-hook all observed LiveData
+        Data.removeProfileObservers(this);
+        Data.profiles.removeObservers(this);
+        Data.lastUpdateTransactionCount.removeObservers(this);
+        Data.lastUpdateAccountCount.removeObservers(this);
+        Data.lastUpdateDate.removeObservers(this);
+
+        recreate();
     }
     public void startEditProfileActivity(MobileLedgerProfile profile) {
         Intent intent = new Intent(this, ProfileDetailActivity.class);
         Bundle args = new Bundle();
         if (profile != null) {
             int index = Data.getProfileIndex(profile);
-            if (index != -1) intent.putExtra(ProfileDetailFragment.ARG_ITEM_ID, index);
+            if (index != -1)
+                intent.putExtra(ProfileDetailFragment.ARG_ITEM_ID, index);
         }
         intent.putExtras(args);
         startActivity(intent, args);
     }
-    private void setupProfile() {
-        String profileUUID = MLDB.getOption(MLDB.OPT_PROFILE_UUID, null);
-        MobileLedgerProfile profile;
-
-        profile = Data.getProfile(profileUUID);
-
-        if (Data.profiles.isEmpty()) {
-            findViewById(R.id.no_profiles_layout).setVisibility(View.VISIBLE);
-            findViewById(R.id.pager_layout).setVisibility(View.GONE);
-            return;
-        }
-
-        findViewById(R.id.pager_layout).setVisibility(View.VISIBLE);
-        findViewById(R.id.no_profiles_layout).setVisibility(View.GONE);
-
-        if (profile == null) profile = Data.profiles.get(0);
-
-        if (profile == null) throw new AssertionError("profile must have a value");
-
-        Data.setCurrentProfile(profile);
-    }
     public void fabNewTransactionClicked(View view) {
         Intent intent = new Intent(this, NewTransactionActivity.class);
         startActivity(intent);
-        overridePendingTransition(R.anim.slide_in_right, R.anim.dummy);
-    }
-    public void navSettingsClicked(View view) {
-        Intent intent = new Intent(this, SettingsActivity.class);
-        startActivity(intent);
-        drawer.closeDrawers();
+        overridePendingTransition(R.anim.slide_in_up, R.anim.dummy);
     }
     public void markDrawerItemCurrent(int id) {
         TextView item = drawer.findViewById(id);
@@ -527,23 +502,22 @@ public class MainActivity extends ProfileThemedActivity {
     }
     private void showAccountSummaryFragment() {
         mViewPager.setCurrentItem(0, true);
-        Data.accountFilter.setValue(null);
+        mainModel.getAccountFilter()
+                 .setValue(null);
     }
     public void onLatestTransactionsClicked(View view) {
         drawer.closeDrawers();
 
-        showTransactionsFragment((String) null);
+        showTransactionsFragment(null);
     }
-    private void showTransactionsFragment(String accName) {
-        Data.accountFilter.setValue(accName);
+    public void showTransactionsFragment(String accName) {
+        mainModel.getAccountFilter()
+                 .setValue(accName);
         mViewPager.setCurrentItem(1, true);
     }
-    private void showTransactionsFragment(LedgerAccount account) {
-        showTransactionsFragment((account == null) ? null : account.getName());
-    }
-    public void showAccountTransactions(LedgerAccount account) {
+    public void showAccountTransactions(String accountName) {
         mBackMeansToAccountList = true;
-        showTransactionsFragment(account);
+        showTransactionsFragment(accountName);
     }
     @Override
     public void onBackPressed() {
@@ -553,264 +527,161 @@ public class MainActivity extends ProfileThemedActivity {
         }
         else {
             if (mBackMeansToAccountList && (mViewPager.getCurrentItem() == 1)) {
-                Data.accountFilter.setValue(null);
+                mainModel.getAccountFilter()
+                         .setValue(null);
                 showAccountSummaryFragment();
                 mBackMeansToAccountList = false;
             }
             else {
-                debug("fragments", String.format("manager stack: %d",
-                        fragmentManager.getBackStackEntryCount()));
+                Logger.debug("fragments", String.format(Locale.ENGLISH, "manager stack: %d",
+                        getSupportFragmentManager().getBackStackEntryCount()));
 
                 super.onBackPressed();
             }
         }
     }
     public void updateLastUpdateTextFromDB() {
-        final MobileLedgerProfile profile = Data.profile.get();
-        long last_update = (profile != null) ? profile.getLongOption(MLDB.OPT_LAST_SCRAPE, 0L) : 0;
+        if (profile == null)
+            return;
+
+        long lastUpdate = profile.getLongOption(MLDB.OPT_LAST_SCRAPE, 0L);
 
-        debug("transactions", String.format("Last update = %d", last_update));
-        if (last_update == 0) {
+        Logger.debug("transactions", String.format(Locale.ENGLISH, "Last update = %d", lastUpdate));
+        if (lastUpdate == 0) {
             Data.lastUpdateDate.postValue(null);
         }
         else {
-            Data.lastUpdateDate.postValue(new Date(last_update));
+            Data.lastUpdateDate.postValue(new Date(lastUpdate));
         }
-    }
-    public void scheduleTransactionListRetrieval() {
-        if (Data.profile.get() == null) return;
 
-        retrieveTransactionsTask = new RetrieveTransactionsTask(new WeakReference<>(this));
+        scheduleDataRetrievalIfStale(lastUpdate);
 
-        retrieveTransactionsTask.execute();
     }
-    public void onStopTransactionRefreshClick(View view) {
-        debug("interactive", "Cancelling transactions refresh");
-        if (retrieveTransactionsTask != null) retrieveTransactionsTask.cancel(false);
-        bTransactionListCancelDownload.setEnabled(false);
-    }
-    public void onRetrieveDone(String error) {
-        progressLayout.setVisibility(View.GONE);
-
-        if (error == null) {
-            updateLastUpdateTextFromDB();
-
-            new RefreshDescriptionsTask().executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR);
-            TransactionListViewModel.scheduleTransactionListReload();
+    private void refreshLastUpdateInfo() {
+        final int formatFlags = DateUtils.FORMAT_SHOW_DATE | DateUtils.FORMAT_SHOW_YEAR |
+                                DateUtils.FORMAT_SHOW_TIME | DateUtils.FORMAT_NUMERIC_DATE;
+        String templateForTransactions =
+                getResources().getString(R.string.transaction_count_summary);
+        String templateForAccounts = getResources().getString(R.string.account_count_summary);
+        Integer accountCount = Data.lastUpdateAccountCount.getValue();
+        Integer transactionCount = Data.lastUpdateTransactionCount.getValue();
+        Date lastUpdate = Data.lastUpdateDate.getValue();
+        if (lastUpdate == null) {
+            Data.lastTransactionsUpdateText.set("----");
+            Data.lastAccountsUpdateText.set("----");
+        }
+        else {
+            Data.lastTransactionsUpdateText.set(
+                    String.format(Objects.requireNonNull(Data.locale.getValue()),
+                            templateForTransactions,
+                            transactionCount == null ? 0 : transactionCount,
+                            DateUtils.formatDateTime(this, lastUpdate.getTime(), formatFlags)));
+            Data.lastAccountsUpdateText.set(
+                    String.format(Objects.requireNonNull(Data.locale.getValue()),
+                            templateForAccounts, accountCount == null ? 0 : accountCount,
+                            DateUtils.formatDateTime(this, lastUpdate.getTime(), formatFlags)));
         }
-        else Toast.makeText(this, error, Toast.LENGTH_LONG).show();
     }
-    public void onRetrieveStart() {
-        bTransactionListCancelDownload.setEnabled(true);
-        progressBar.setIndeterminateTintList(ColorStateList.valueOf(Colors.primary));
-        progressBar.setProgressTintList(ColorStateList.valueOf(Colors.primary));
-        progressBar.setIndeterminate(true);
-        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) progressBar.setProgress(0, false);
-        else progressBar.setProgress(0);
-        progressLayout.setVisibility(View.VISIBLE);
+    public void onStopTransactionRefreshClick(View view) {
+        Logger.debug("interactive", "Cancelling transactions refresh");
+        mainModel.stopTransactionsRetrieval();
+        bTransactionListCancelDownload.setEnabled(false);
     }
-    public void onRetrieveProgress(RetrieveTransactionsTask.Progress progress) {
-        if ((progress.getTotal() == RetrieveTransactionsTask.Progress.INDETERMINATE) ||
-            (progress.getTotal() == 0))
-        {
+    public void onRetrieveRunningChanged(Boolean running) {
+        final View progressLayout = findViewById(R.id.transaction_progress_layout);
+        if (running) {
+            ProgressBar progressBar = findViewById(R.id.transaction_list_progress_bar);
+            bTransactionListCancelDownload.setEnabled(true);
+            ColorStateList csl = Colors.getColorStateList();
+            progressBar.setIndeterminateTintList(csl);
+            progressBar.setProgressTintList(csl);
             progressBar.setIndeterminate(true);
-        }
-        else {
-            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
-                progressBar.setMin(0);
-            }
-            progressBar.setMax(progress.getTotal());
             if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
-                progressBar.setProgress(progress.getProgress(), true);
+                progressBar.setProgress(0, false);
             }
-            else progressBar.setProgress(progress.getProgress());
-            progressBar.setIndeterminate(false);
-        }
-    }
-    public void fabShouldShow() {
-        MobileLedgerProfile profile = Data.profile.get();
-        if ((profile != null) && profile.isPostingPermitted()) fab.show();
-    }
-    public void fabHide() {
-        fab.hide();
-    }
-    public void navProfilesHeadClicked(View view) {
-        if (profileListExpanded) {
-            collapseProfileList();
+            else {
+                progressBar.setProgress(0);
+            }
+            progressLayout.setVisibility(View.VISIBLE);
         }
         else {
-            expandProfileList();
+            progressLayout.setVisibility(View.GONE);
         }
     }
-    private void expandProfileList() {
-        profileListExpanded = true;
+    public void onRetrieveProgress(RetrieveTransactionsTask.Progress progress) {
+        ProgressBar progressBar = findViewById(R.id.transaction_list_progress_bar);
 
+        if (progress.getState() == RetrieveTransactionsTask.ProgressState.FINISHED) {
+            Logger.debug("progress", "Done");
+            findViewById(R.id.transaction_progress_layout).setVisibility(View.GONE);
 
-        profileListContainer.setVisibility(View.VISIBLE);
-        profileListContainer.startAnimation(AnimationUtils.loadAnimation(this, R.anim.slide_down));
-        profileListHeadArrow.startAnimation(AnimationUtils.loadAnimation(this, R.anim.rotate_180));
-        profileListHeadMore.setVisibility(View.VISIBLE);
-        profileListHeadMore.startAnimation(AnimationUtils.loadAnimation(this, R.anim.fade_in));
-        findViewById(R.id.nav_profile_list).setMinimumHeight(
-                (int) (getResources().getDimension(R.dimen.thumb_row_height) *
-                       Data.profiles.size()));
-    }
-    private void collapseProfileList() {
-        boolean wasExpanded = profileListExpanded;
-        profileListExpanded = false;
+            mainModel.transactionRetrievalDone();
 
-        if (wasExpanded) {
-            final Animation animation = AnimationUtils.loadAnimation(this, R.anim.slide_up);
-            animation.setAnimationListener(new Animation.AnimationListener() {
-                @Override
-                public void onAnimationStart(Animation animation) {
+            if (progress.getError() != null) {
+                Snackbar.make(mViewPager, progress.getError(), Snackbar.LENGTH_LONG)
+                        .show();
+                return;
+            }
 
-                }
-                @Override
-                public void onAnimationEnd(Animation animation) {
-                    profileListContainer.setVisibility(View.GONE);
-                }
-                @Override
-                public void onAnimationRepeat(Animation animation) {
+            return;
+        }
 
-                }
-            });
-            mProfileListAdapter.stopEditingProfiles();
-
-            profileListContainer.startAnimation(animation);
-            profileListHeadArrow.setRotation(0f);
-            profileListHeadArrow
-                    .startAnimation(AnimationUtils.loadAnimation(this, R.anim.rotate_180_back));
-            final Animation moreAnimation = AnimationUtils.loadAnimation(this, R.anim.fade_out);
-            moreAnimation.setAnimationListener(new Animation.AnimationListener() {
-                @Override
-                public void onAnimationStart(Animation animation) {
-                }
-                @Override
-                public void onAnimationEnd(Animation animation) {
-                    profileListHeadMore.setVisibility(View.GONE);
-                }
-                @Override
-                public void onAnimationRepeat(Animation animation) {
-                }
-            });
-            profileListHeadMore.startAnimation(moreAnimation);
+
+        bTransactionListCancelDownload.setEnabled(true);
+//        ColorStateList csl = Colors.getColorStateList();
+//        progressBar.setIndeterminateTintList(csl);
+//        progressBar.setProgressTintList(csl);
+//        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N)
+//            progressBar.setProgress(0, false);
+//        else
+//            progressBar.setProgress(0);
+        findViewById(R.id.transaction_progress_layout).setVisibility(View.VISIBLE);
+
+        if (progress.isIndeterminate() || (progress.getTotal() <= 0)) {
+            progressBar.setIndeterminate(true);
+            Logger.debug("progress", "indeterminate");
         }
         else {
-            profileListContainer.setVisibility(View.GONE);
-            profileListHeadArrow.setRotation(0f);
-            profileListHeadMore.setVisibility(View.GONE);
+            if (progressBar.isIndeterminate()) {
+                progressBar.setIndeterminate(false);
+            }
+//            Logger.debug("progress",
+//                    String.format(Locale.US, "%d/%d", progress.getProgress(), progress.getTotal
+//                    ()));
+            progressBar.setMax(progress.getTotal());
+            // for some reason animation doesn't work - no progress is shown (stick at 0)
+            // on lineageOS 14.1 (Nougat, 7.1.2)
+            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N)
+                progressBar.setProgress(progress.getProgress(), false);
+            else
+                progressBar.setProgress(progress.getProgress());
         }
     }
-    public void onAccountSummaryRowViewClicked(View view) {
-        ViewGroup row;
-        if (view.getId() == R.id.account_expander) row = (ViewGroup) view.getParent().getParent();
-        else row = (ViewGroup) view.getParent();
-
-        LedgerAccount acc = (LedgerAccount) row.getTag();
-        switch (view.getId()) {
-            case R.id.account_row_acc_name:
-            case R.id.account_expander:
-            case R.id.account_expander_container:
-                debug("accounts", "Account expander clicked");
-                if (!acc.hasSubAccounts()) return;
-
-                boolean wasExpanded = acc.isExpanded();
-
-                View arrow = row.findViewById(R.id.account_expander_container);
-
-                arrow.clearAnimation();
-                ViewPropertyAnimator animator = arrow.animate();
-
-                acc.toggleExpanded();
-                DbOpQueue.add("update accounts set expanded=? where name=? and profile=?",
-                        new Object[]{acc.isExpanded(), acc.getName(), Data.profile.get().getUuid()
-                        });
-
-                if (wasExpanded) {
-                    debug("accounts", String.format("Collapsing account '%s'", acc.getName()));
-                    arrow.setRotation(0);
-                    animator.rotationBy(180);
-
-                    // removing all child accounts from the view
-                    int start = -1, count = 0;
-                    try (LockHolder ignored = Data.accounts.lockForWriting()) {
-                        for (int i = 0; i < Data.accounts.size(); i++) {
-                            if (acc.isParentOf(Data.accounts.get(i))) {
-//                                debug("accounts", String.format("Found a child '%s' at position %d",
-//                                        Data.accounts.get(i).getName(), i));
-                                if (start == -1) {
-                                    start = i;
-                                }
-                                count++;
-                            }
-                            else {
-                                if (start != -1) {
-//                                    debug("accounts",
-//                                            String.format("Found a non-child '%s' at position %d",
-//                                                    Data.accounts.get(i).getName(), i));
-                                    break;
-                                }
-                            }
-                        }
-
-                        if (start != -1) {
-                            for (int j = 0; j < count; j++) {
-//                                debug("accounts", String.format("Removing item %d: %s", start + j,
-//                                        Data.accounts.get(start).getName()));
-                                Data.accounts.removeQuietly(start);
-                            }
-
-                            mAccountSummaryFragment.modelAdapter
-                                    .notifyItemRangeRemoved(start, count);
-                        }
-                    }
-                }
-                else {
-                    debug("accounts", String.format("Expanding account '%s'", acc.getName()));
-                    arrow.setRotation(180);
-                    animator.rotationBy(-180);
-                    List<LedgerAccount> children =
-                            Data.profile.get().loadVisibleChildAccountsOf(acc);
-                    try (LockHolder ignored = Data.accounts.lockForWriting()) {
-                        int parentPos = Data.accounts.indexOf(acc);
-                        if (parentPos != -1) {
-                            // may have disappeared in a concurrent refresh operation
-                            Data.accounts.addAllQuietly(parentPos + 1, children);
-                            mAccountSummaryFragment.modelAdapter
-                                    .notifyItemRangeInserted(parentPos + 1, children.size());
-                        }
-                    }
-                }
-                break;
-            case R.id.account_row_acc_amounts:
-                if (acc.getAmountCount() > AccountSummaryAdapter.AMOUNT_LIMIT) {
-                    acc.toggleAmountsExpanded();
-                    DbOpQueue
-                            .add("update accounts set amounts_expanded=? where name=? and profile=?",
-                                    new Object[]{acc.amountsExpanded(), acc.getName(),
-                                                 Data.profile.get().getUuid()
-                                    });
-                    Data.accounts.triggerItemChangedNotification(acc);
-                }
-                break;
-        }
+    public void fabShouldShow() {
+        if ((profile != null) && profile.isPostingPermitted() && !drawer.isOpen())
+            fab.show();
+        else
+            fabHide();
+    }
+    public void fabHide() {
+        fab.hide();
     }
 
-    public class SectionsPagerAdapter extends FragmentPagerAdapter {
+    public static class SectionsPagerAdapter extends FragmentPagerAdapter {
 
         SectionsPagerAdapter(FragmentManager fm) {
-            super(fm);
+            super(fm, BEHAVIOR_RESUME_ONLY_CURRENT_FRAGMENT);
         }
 
         @NotNull
         @Override
         public Fragment getItem(int position) {
-            debug("main", String.format("Switching to fragment %d", position));
+            Logger.debug("main",
+                    String.format(Locale.ENGLISH, "Switching to fragment %d", position));
             switch (position) {
                 case 0:
 //                    debug("flow", "Creating account summary fragment");
-                    return mAccountSummaryFragment = new AccountSummaryFragment();
+                    return new AccountSummaryFragment();
                 case 1:
                     return new TransactionListFragment();
                 default: