]> git.ktnx.net Git - mobile-ledger.git/blobdiff - app/src/main/java/net/ktnx/mobileledger/ui/activity/MainActivity.java
fix (+) fab visible after profile change (activity recreation)
[mobile-ledger.git] / app / src / main / java / net / ktnx / mobileledger / ui / activity / MainActivity.java
index 833c038a26ef095e35f8ac397609a25e6b5b2f7a..3f71e0a4707cf0f19dd5883b372795d9b6cacc96 100644 (file)
@@ -18,6 +18,7 @@
 package net.ktnx.mobileledger.ui.activity;
 
 import android.content.Intent;
+import android.content.SharedPreferences;
 import android.content.pm.PackageInfo;
 import android.content.pm.ShortcutInfo;
 import android.content.pm.ShortcutManager;
@@ -31,14 +32,25 @@ 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.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;
@@ -55,137 +67,117 @@ 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.GetOptCallback;
 import net.ktnx.mobileledger.utils.LockHolder;
 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 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";
+    private static final String PREF_THEME_ID = "themeId";
     public AccountSummaryFragment mAccountSummaryFragment;
     DrawerLayout drawer;
-    private LinearLayout profileListContainer;
-    private View profileListHeadArrow, profileListHeadMore, profileListHeadCancel;
-    private LinearLayout profileListHeadMoreAndCancel;
-    private FragmentManager fragmentManager;
-    private TextView tvLastUpdate;
-    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 profileModificationEnabled = false;
-    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;
     @Override
     protected void onStart() {
         super.onStart();
 
-        Log.d("flow", "MainActivity.onStart()");
         mViewPager.setCurrentItem(mCurrentPage, false);
-        if (mAccountFilter != null) showTransactionsFragment(mAccountFilter);
-        else Data.accountFilter.setValue(null);
-
     }
     @Override
-    protected void onSaveInstanceState(Bundle outState) {
+    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 (Data.accountFilter.getValue() != null)
+            outState.putString(STATE_ACC_FILTER, Data.accountFilter.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);
-        Log.d("flow", "MainActivity.onCreate()");
-        int profileColor = Data.retrieveCurrentThemeIdFromDb();
+    protected void setupProfileColors() {
+        SharedPreferences prefs = getPreferences(MODE_PRIVATE);
+        int profileColor = prefs.getInt(PREF_THEME_ID, -2);
+        if (profileColor == -2)
+            profileColor = Data.retrieveCurrentThemeIdFromDb();
         Colors.setupTheme(this, profileColor);
         Colors.profileThemeId = profileColor;
+        storeThemeIdInPrefs(profileColor);
+    }
+    @Override
+    protected void onResume() {
+        super.onResume();
+        fabShouldShow();
+    }
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        debug("flow", "MainActivity.onCreate()");
         setContentView(R.layout.activity_main);
 
         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);
-        profileListHeadMoreAndCancel = findViewById(R.id.nav_profile_list_head_buttons);
+        LinearLayout profileListHeadMoreAndCancel =
+                findViewById(R.id.nav_profile_list_head_buttons);
+        profileListHeadAddProfile = findViewById(R.id.nav_new_profile_button);
         drawer = findViewById(R.id.drawer_layout);
-        tvLastUpdate = findViewById(R.id.transactions_last_update);
         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.profile.observe(this, this::onProfileChanged);
 
-        if (profilesObserver == null) {
-            profilesObserver = (o, arg) -> onProfileListChanged(arg);
-            Data.profiles.addObserver(profilesObserver);
-        }
+        Data.profiles.observe(this, this::onProfileListChanged);
 
         if (barDrawerToggle == null) {
             barDrawerToggle = new ActionBarDrawerToggle(this, drawer, mToolbar,
@@ -193,23 +185,37 @@ public class MainActivity extends ProfileThemedActivity {
             drawer.addDrawerListener(barDrawerToggle);
         }
         barDrawerToggle.syncState();
+        drawer.addDrawerListener(new DrawerLayout.DrawerListener() {
+            @Override
+            public void onDrawerSlide(@NonNull View drawerView, float slideOffset) {
+                if (slideOffset > 0.2)
+                    fabHide();
+            }
+            @Override
+            public void onDrawerOpened(@NonNull View drawerView) {
+                fabHide();
+            }
+            @Override
+            public void onDrawerClosed(@NonNull View drawerView) {
+                fabShouldShow();
+            }
+            @Override
+            public void onDrawerStateChanged(int newState) {}
+        });
 
-        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);
@@ -218,6 +224,7 @@ 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);
@@ -242,46 +249,57 @@ public class MainActivity extends ProfileThemedActivity {
             if (currentPage != -1) {
                 mCurrentPage = currentPage;
             }
-            mAccountFilter = savedInstanceState.getString(STATE_ACC_FILTER, null);
+            Data.accountFilter.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()) {
-                    profileListHeadArrow.clearAnimation();
-                    profileListHeadArrow.setVisibility(View.GONE);
-                    profileListHeadMore.setVisibility(View.GONE);
-                    profileListHeadCancel.setVisibility(View.VISIBLE);
+        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 {
-                    profileListHeadArrow.setRotation(180f);
-                    profileListHeadArrow.setVisibility(View.VISIBLE);
-                    profileListHeadCancel.setVisibility(View.GONE);
-                    profileListHeadMore.setVisibility(View.GONE);
-                    profileListHeadMore
-                            .setVisibility(profileListExpanded ? View.VISIBLE : 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);
 
@@ -290,218 +308,218 @@ 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 onDrawerClosed(View drawerView) {
                     super.onDrawerClosed(drawerView);
-                    collapseProfileList();
+                    mProfileListAdapter.setAnimationsEnabled(false);
+                    mProfileListAdapter.editingProfiles.setValue(false);
+                }
+                @Override
+                public void onDrawerOpened(View drawerView) {
+                    super.onDrawerOpened(drawerView);
+                    mProfileListAdapter.setAnimationsEnabled(true);
                 }
             };
             drawer.addDrawerListener(drawerListener);
         }
-
-        findViewById(R.id.nav_profile_list_head_layout)
-                .setOnClickListener(this::navProfilesHeadClicked);
-        findViewById(R.id.nav_profiles_label).setOnClickListener(this::navProfilesHeadClicked);
-        setupProfile();
-        onProfileChanged(null);
-
-        updateLastUpdateTextFromDB();
     }
     private void scheduleDataRetrievalIfStale(Date lastUpdate) {
         long now = new Date().getTime();
         if ((lastUpdate == null) || (now > (lastUpdate.getTime() + (24 * 3600 * 1000)))) {
-            if (lastUpdate == null) Log.d("db::", "WEB data never fetched. scheduling a fetch");
-            else Log.d("db",
-                    String.format("WEB data last fetched at %1.3f and now is %1.3f. re-fetching",
-                            lastUpdate.getTime() / 1000f, now / 1000f));
-
-            scheduleTransactionListRetrieval();
+            if (lastUpdate == null)
+                debug("db::", "WEB data never fetched. scheduling a fetch");
+            else
+                debug("db", String.format(Locale.ENGLISH,
+                        "WEB data last fetched at %1.3f and now is %1.3f. re-fetching",
+                        lastUpdate.getTime() / 1000f, now / 1000f));
+
+            Data.scheduleTransactionListRetrieval(this);
         }
     }
-    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 lh = 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;
+
+            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);
+            i++;
         }
-        ShortcutManager sm = getSystemService(ShortcutManager.class);
         sm.setDynamicShortcuts(shortcuts);
     }
-    private void onProfileListChanged(Object arg) {
-        findViewById(R.id.nav_profile_list).setMinimumHeight(
-                (int) (getResources().getDimension(R.dimen.thumb_row_height) *
-                       Data.profiles.size()));
+    private void onProfileListChanged(List<MobileLedgerProfile> newList) {
+        if (newList == null) {
+            // profiles not yet loaded from DB
+            findViewById(R.id.loading_layout).setVisibility(View.VISIBLE);
+            findViewById(R.id.no_profiles_layout).setVisibility(View.GONE);
+            findViewById(R.id.main_app_layout).setVisibility(View.GONE);
+            return;
+        }
 
-        Log.d("profiles", "profile list changed");
-        if (arg == null) mProfileListAdapter.notifyDataSetChanged();
-        else mProfileListAdapter.notifyItemChanged((int) arg);
+        if (newList.isEmpty()) {
+            findViewById(R.id.no_profiles_layout).setVisibility(View.VISIBLE);
+            findViewById(R.id.main_app_layout).setVisibility(View.GONE);
+            findViewById(R.id.loading_layout).setVisibility(View.GONE);
+            return;
+        }
 
-        createShortcuts();
-    }
-    private void onProfileChanged(Object arg) {
-        MobileLedgerProfile profile = Data.profile.get();
-        MainActivity.this.runOnUiThread(() -> {
+        findViewById(R.id.main_app_layout).setVisibility(View.VISIBLE);
+        findViewById(R.id.no_profiles_layout).setVisibility(View.GONE);
+        findViewById(R.id.loading_layout).setVisibility(View.GONE);
 
-            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);
+        findViewById(R.id.nav_profile_list).setMinimumHeight(
+                (int) (getResources().getDimension(R.dimen.thumb_row_height) * newList.size()));
+
+        debug("profiles", "profile list changed");
+        mProfileListAdapter.notifyDataSetChanged();
+
+        createShortcuts(newList);
+    }
+    /**
+     * called when the current profile has changed
+     */
+    private void onProfileChanged(MobileLedgerProfile profile) {
+        boolean haveProfile = profile != null;
+
+        if (haveProfile)
+            setTitle(profile.getName());
+        else
+            setTitle(R.string.app_name);
+
+        this.profile = profile;
+
+        int newProfileTheme = haveProfile ? profile.getThemeHue() : -1;
+        if (newProfileTheme != Colors.profileThemeId) {
+            debug("profiles",
+                    String.format(Locale.ENGLISH, "profile theme %d â†’ %d", Colors.profileThemeId,
+                            newProfileTheme));
+            Colors.profileThemeId = newProfileTheme;
+            profileThemeChanged();
+            // profileThemeChanged would restart the activity, so no need to reload the
+            // data sets below
+            return;
+        }
 
-            Data.transactions.clear();
-            Log.d("transactions", "requesting list reload");
-            TransactionListViewModel.scheduleTransactionListReload();
+        findViewById(R.id.no_profiles_layout).setVisibility(haveProfile ? View.GONE : View.VISIBLE);
+        findViewById(R.id.pager_layout).setVisibility(haveProfile ? View.VISIBLE : View.VISIBLE);
 
-            Data.accounts.clear();
-            AccountSummaryViewModel.scheduleAccountListReload();
-
-            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);
-            }
+        mProfileListAdapter.notifyDataSetChanged();
 
-            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) {
-                Log.d("profiles", String.format("profile theme %d â†’ %d", Colors.profileThemeId,
-                        newProfileTheme));
-                MainActivity.this.profileThemeChanged();
-                Colors.profileThemeId = newProfileTheme;
-                // profileThemeChanged would restart the activity, so no need to reload the
-                // data sets below
-                return;
-            }
-            drawer.closeDrawers();
+        drawer.closeDrawers();
+
+        Data.transactions.clear();
+        debug("transactions", "requesting list reload");
+        TransactionListViewModel.scheduleTransactionListReload();
+
+        Data.accounts.clear();
+        AccountSummaryViewModel.scheduleAccountListReload();
 
-            if (profile == null) {
+        if (haveProfile) {
+            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();
             }
+        }
+        else {
+            mToolbar.setSubtitle(null);
+            fab.hide();
+        }
 
-            updateLastUpdateTextFromDB();
-        });
+        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);
-            Log.d("main", "no last update date :(");
+            debug("main", "no last update date :(");
         }
         else {
-            final String text = DateFormat.getDateTimeInstance().format(newValue);
+            final String text = DateFormat.getDateTimeInstance()
+                                          .format(newValue);
             v.setText(text);
             l.setVisibility(View.VISIBLE);
-            Log.d("main", String.format("Date formatted: %s", text));
+            debug("main", String.format("Date formatted: %s", text));
         }
 
         scheduleDataRetrievalIfStale(newValue);
     }
-    @Override
-    public void finish() {
-        if (profilesObserver != null) {
-            Data.profiles.deleteObserver(profilesObserver);
-            profilesObserver = null;
-        }
+    private void profileThemeChanged() {
+        storeThemeIdInPrefs(profile.getThemeHue());
 
-        if (profileObserver != null) {
-            Data.profile.deleteObserver(profileObserver);
-            profileObserver = null;
-        }
+        // un-hook all observed LiveData
+        Data.profile.removeObservers(this);
+        Data.profiles.removeObservers(this);
+        Data.lastUpdateDate.removeObservers(this);
 
-        super.finish();
+        recreate();
     }
-    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);
+    private void storeThemeIdInPrefs(int themeId) {
+        // store the new theme id in the preferences
+        SharedPreferences prefs = getPreferences(MODE_PRIVATE);
+        SharedPreferences.Editor e = prefs.edit();
+        e.putInt(PREF_THEME_ID, themeId);
+        e.apply();
     }
     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");
+        MLDB.getOption(MLDB.OPT_PROFILE_UUID, null, new GetOptCallback() {
+            @Override
+            protected void onResult(String profileUUID) {
+                MobileLedgerProfile startupProfile;
 
-        Data.setCurrentProfile(profile);
+                startupProfile = Data.getProfile(profileUUID);
+                Data.setCurrentProfile(startupProfile);
+            }
+        });
     }
     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);
@@ -523,43 +541,18 @@ public class MainActivity extends ProfileThemedActivity {
     private void showAccountSummaryFragment() {
         mViewPager.setCurrentItem(0, true);
         Data.accountFilter.setValue(null);
-//        FragmentTransaction ft = fragmentManager.beginTransaction();
-//        accountSummaryFragment = new AccountSummaryFragment();
-//        ft.replace(R.id.root_frame, accountSummaryFragment);
-//        ft.commit();
-//        currentFragment = accountSummaryFragment;
     }
     public void onLatestTransactionsClicked(View view) {
         drawer.closeDrawers();
 
         showTransactionsFragment((String) null);
     }
-    private void resetFragmentBackStack() {
-//        fragmentManager.popBackStack(0, FragmentManager.POP_BACK_STACK_INCLUSIVE);
-    }
     private void showTransactionsFragment(String accName) {
         Data.accountFilter.setValue(accName);
         mViewPager.setCurrentItem(1, true);
     }
     private void showTransactionsFragment(LedgerAccount account) {
-        showTransactionsFragment((account == null) ? (String) null : account.getName());
-//        FragmentTransaction ft = fragmentManager.beginTransaction();
-//        if (transactionListFragment == null) {
-//            Log.d("flow", "MainActivity creating TransactionListFragment");
-//            transactionListFragment = new TransactionListFragment();
-//        }
-//        Bundle bundle = new Bundle();
-//        if (account != null) {
-//            bundle.putString(TransactionListFragment.BUNDLE_KEY_FILTER_ACCOUNT_NAME,
-//                    account.getName());
-//        }
-//        transactionListFragment.setArguments(bundle);
-//        ft.replace(R.id.root_frame, transactionListFragment);
-//        if (account != null)
-//            ft.addToBackStack(getResources().getString(R.string.title_activity_transaction_list));
-//        ft.commit();
-//
-//        currentFragment = transactionListFragment;
+        showTransactionsFragment((account == null) ? null : account.getName());
     }
     public void showAccountTransactions(LedgerAccount account) {
         mBackMeansToAccountList = true;
@@ -578,18 +571,20 @@ public class MainActivity extends ProfileThemedActivity {
                 mBackMeansToAccountList = false;
             }
             else {
-                Log.d("fragments", String.format("manager stack: %d",
-                        fragmentManager.getBackStackEntryCount()));
+                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;
 
-        Log.d("transactions", String.format("Last update = %d", last_update));
+        long last_update = profile.getLongOption(MLDB.OPT_LAST_SCRAPE, 0L);
+
+        debug("transactions", String.format(Locale.ENGLISH, "Last update = %d", last_update));
         if (last_update == 0) {
             Data.lastUpdateDate.postValue(null);
         }
@@ -597,20 +592,14 @@ public class MainActivity extends ProfileThemedActivity {
             Data.lastUpdateDate.postValue(new Date(last_update));
         }
     }
-    public void scheduleTransactionListRetrieval() {
-        if (Data.profile.get() == null) return;
-
-        retrieveTransactionsTask = new RetrieveTransactionsTask(new WeakReference<>(this));
-
-        retrieveTransactionsTask.execute();
-    }
     public void onStopTransactionRefreshClick(View view) {
-        Log.d("interactive", "Cancelling transactions refresh");
-        if (retrieveTransactionsTask != null) retrieveTransactionsTask.cancel(false);
+        debug("interactive", "Cancelling transactions refresh");
+        Data.stopTransactionsRetrieval();
         bTransactionListCancelDownload.setEnabled(false);
     }
     public void onRetrieveDone(String error) {
-        progressLayout.setVisibility(View.GONE);
+        Data.transactionRetrievalDone();
+        findViewById(R.id.transaction_progress_layout).setVisibility(View.GONE);
 
         if (error == null) {
             updateLastUpdateTextFromDB();
@@ -618,18 +607,25 @@ public class MainActivity extends ProfileThemedActivity {
             new RefreshDescriptionsTask().executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR);
             TransactionListViewModel.scheduleTransactionListReload();
         }
-        else Toast.makeText(this, error, Toast.LENGTH_LONG).show();
+        else
+            Snackbar.make(mViewPager, error, Snackbar.LENGTH_LONG)
+                    .show();
     }
     public void onRetrieveStart() {
+        ProgressBar progressBar = findViewById(R.id.transaction_list_progress_bar);
         bTransactionListCancelDownload.setEnabled(true);
-        progressBar.setIndeterminateTintList(ColorStateList.valueOf(Colors.primary));
-        progressBar.setProgressTintList(ColorStateList.valueOf(Colors.primary));
+        ColorStateList csl = Colors.getColorStateList();
+        progressBar.setIndeterminateTintList(csl);
+        progressBar.setProgressTintList(csl);
         progressBar.setIndeterminate(true);
-        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) progressBar.setProgress(0, false);
-        else progressBar.setProgress(0);
-        progressLayout.setVisibility(View.VISIBLE);
+        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);
     }
     public void onRetrieveProgress(RetrieveTransactionsTask.Progress progress) {
+        ProgressBar progressBar = findViewById(R.id.transaction_list_progress_bar);
         if ((progress.getTotal() == RetrieveTransactionsTask.Progress.INDETERMINATE) ||
             (progress.getTotal() == 0))
         {
@@ -643,73 +639,36 @@ public class MainActivity extends ProfileThemedActivity {
             if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
                 progressBar.setProgress(progress.getProgress(), true);
             }
-            else progressBar.setProgress(progress.getProgress());
+            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 navProfilesHeadClicked(View view) {
-        if (profileListExpanded) {
-            collapseProfileList();
-        }
-        else {
-            expandProfileList();
-        }
+        if ((profile != null) && profile.isPostingPermitted() && !drawer.isOpen())
+            fab.show();
+        else
+            fabHide();
     }
-    private void expandProfileList() {
-        profileListExpanded = true;
-
-
-        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() {
-        profileListExpanded = false;
-
-        final Animation animation = AnimationUtils.loadAnimation(this, R.anim.slide_up);
-        animation.setAnimationListener(new Animation.AnimationListener() {
-            @Override
-            public void onAnimationStart(Animation animation) {
-
-            }
-            @Override
-            public void onAnimationEnd(Animation animation) {
-                profileListContainer.setVisibility(View.GONE);
-            }
-            @Override
-            public void onAnimationRepeat(Animation animation) {
-
-            }
-        });
-        mProfileListAdapter.stopEditingProfiles();
-
-        profileListContainer.startAnimation(animation);
-        profileListHeadArrow.setRotation(0f);
-        profileListHeadArrow
-                .startAnimation(AnimationUtils.loadAnimation(this, R.anim.rotate_180_back));
-        profileListHeadMore.setVisibility(View.GONE);
+    public void fabHide() {
+        fab.hide();
     }
     public void onAccountSummaryRowViewClicked(View view) {
         ViewGroup row;
-        if (view.getId() == R.id.account_expander) row = (ViewGroup) view.getParent().getParent();
-        else row = (ViewGroup) view.getParent();
+        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:
-                Log.d("accounts", "Account expander clicked");
-                if (!acc.hasSubAccounts()) return;
+                debug("accounts", "Account expander clicked");
+                if (!acc.hasSubAccounts())
+                    return;
 
                 boolean wasExpanded = acc.isExpanded();
 
@@ -720,20 +679,21 @@ public class MainActivity extends ProfileThemedActivity {
 
                 acc.toggleExpanded();
                 DbOpQueue.add("update accounts set expanded=? where name=? and profile=?",
-                        new Object[]{acc.isExpanded(), acc.getName(), Data.profile.get().getUuid()
+                        new Object[]{acc.isExpanded(), acc.getName(), profile.getUuid()
                         });
 
                 if (wasExpanded) {
-                    Log.d("accounts", String.format("Collapsing account '%s'", acc.getName()));
+                    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 lh = Data.accounts.lockForWriting()) {
+                    try (LockHolder ignored = Data.accounts.lockForWriting()) {
                         for (int i = 0; i < Data.accounts.size(); i++) {
                             if (acc.isParentOf(Data.accounts.get(i))) {
-//                                Log.d("accounts", String.format("Found a child '%s' at position %d",
+//                                debug("accounts", String.format("Found a child '%s' at position
+//                                %d",
 //                                        Data.accounts.get(i).getName(), i));
                                 if (start == -1) {
                                     start = i;
@@ -742,7 +702,7 @@ public class MainActivity extends ProfileThemedActivity {
                             }
                             else {
                                 if (start != -1) {
-//                                    Log.d("accounts",
+//                                    debug("accounts",
 //                                            String.format("Found a non-child '%s' at position %d",
 //                                                    Data.accounts.get(i).getName(), i));
                                     break;
@@ -752,29 +712,28 @@ public class MainActivity extends ProfileThemedActivity {
 
                         if (start != -1) {
                             for (int j = 0; j < count; j++) {
-//                                Log.d("accounts", String.format("Removing item %d: %s", start + 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);
+                            mAccountSummaryFragment.modelAdapter.notifyItemRangeRemoved(start,
+                                    count);
                         }
                     }
                 }
                 else {
-                    Log.d("accounts", String.format("Expanding account '%s'", acc.getName()));
+                    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 lh = Data.accounts.lockForWriting()) {
+                    List<LedgerAccount> children = profile.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());
+                            mAccountSummaryFragment.modelAdapter.notifyItemRangeInserted(
+                                    parentPos + 1, children.size());
                         }
                     }
                 }
@@ -782,11 +741,10 @@ public class MainActivity extends ProfileThemedActivity {
             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()
-                                    });
+                    DbOpQueue.add(
+                            "update accounts set amounts_expanded=? where name=? and profile=?",
+                            new Object[]{acc.amountsExpanded(), acc.getName(), profile.getUuid()
+                            });
                     Data.accounts.triggerItemChangedNotification(acc);
                 }
                 break;
@@ -795,17 +753,17 @@ public class MainActivity extends ProfileThemedActivity {
 
     public class SectionsPagerAdapter extends FragmentPagerAdapter {
 
-        public SectionsPagerAdapter(FragmentManager fm) {
-            super(fm);
+        SectionsPagerAdapter(FragmentManager fm) {
+            super(fm, BEHAVIOR_RESUME_ONLY_CURRENT_FRAGMENT);
         }
 
         @NotNull
         @Override
         public Fragment getItem(int position) {
-            Log.d("main", String.format("Switching to fragment %d", position));
+            debug("main", String.format(Locale.ENGLISH, "Switching to fragment %d", position));
             switch (position) {
                 case 0:
-//                    Log.d("flow", "Creating account summary fragment");
+//                    debug("flow", "Creating account summary fragment");
                     return mAccountSummaryFragment = new AccountSummaryFragment();
                 case 1:
                     return new TransactionListFragment();