Start working on ability to remove groups

app/src/main/java/me/impy/aegis/db/DatabaseManager.java

@@ -172,6 +172,17 @@ public class DatabaseManager {
         return groups;
     }
 
+    public void removeGroup(String groupName) {
+        TreeSet<String> groups = new TreeSet<>(Collator.getInstance());
+        for (DatabaseEntry entry : getEntries()) {
+            String group = entry.getGroup();
+            if (group != null && group.equals(groupName)) {
+                entry.setGroup(null);
+                _db.replaceEntry(entry);
+            }
+        }
+    }
+
     public DatabaseFileCredentials getCredentials() {
         assertState(false, true);
         return _creds;

app/src/main/java/me/impy/aegis/ui/GroupManagerActivity.java

@@ -0,0 +1,58 @@
+package me.impy.aegis.ui;
+
+import android.os.Bundle;
+
+import java.util.TreeSet;
+
+import androidx.appcompat.app.ActionBar;
+import androidx.recyclerview.widget.LinearLayoutManager;
+import androidx.recyclerview.widget.RecyclerView;
+import me.impy.aegis.AegisApplication;
+import me.impy.aegis.R;
+import me.impy.aegis.db.DatabaseFileCredentials;
+import me.impy.aegis.db.DatabaseManager;
+import me.impy.aegis.db.slots.Slot;
+import me.impy.aegis.ui.views.GroupAdapter;
+import me.impy.aegis.ui.views.SlotAdapter;
+
+public class GroupManagerActivity extends AegisActivity implements GroupAdapter.Listener {
+    private AegisApplication _app;
+    private DatabaseManager _db;
+    private GroupAdapter _adapter;
+
+    TreeSet<String> groups;
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_groups);
+
+        _app = (AegisApplication) getApplication();
+        _db = _app.getDatabaseManager();
+
+        groups = _db.getGroups();
+
+        ActionBar bar = getSupportActionBar();
+        bar.setHomeAsUpIndicator(R.drawable.ic_close);
+        bar.setDisplayHomeAsUpEnabled(true);
+
+        // set up the recycler view
+        _adapter = new GroupAdapter(this);
+        RecyclerView slotsView = findViewById(R.id.list_slots);
+        LinearLayoutManager layoutManager = new LinearLayoutManager(this);
+        slotsView.setLayoutManager(layoutManager);
+        slotsView.setAdapter(_adapter);
+        slotsView.setNestedScrollingEnabled(false);
+
+        // load the slots and masterKey
+        for (String group : groups) {
+            _adapter.addGroup(group);
+        }
+    }
+
+    @Override
+    public void onRemoveGroup(String group) {
+        _db.removeGroup(group);
+        groups.remove(group);
+    }
+}

app/src/main/java/me/impy/aegis/ui/PreferencesFragment.java

@@ -67,6 +67,7 @@ public class PreferencesFragment extends PreferenceFragmentCompat {
     private SwitchPreference _fingerprintPreference;
     private Preference _setPasswordPreference;
     private Preference _slotsPreference;
+    private Preference _groupsPreference;
 
     @Override
     public void onCreatePreferencesFix(Bundle savedInstanceState, String rootKey) {
@@ -208,6 +209,15 @@ public class PreferencesFragment extends PreferenceFragmentCompat {
             }
         });
 
+        _groupsPreference = findPreference("pref_groups");
+        _groupsPreference.setOnPreferenceClickListener(new Preference.OnPreferenceClickListener() {
+            @Override
+            public boolean onPreferenceClick(Preference preference) {
+                Intent intent = new Intent(getActivity(), GroupManagerActivity.class);
+                startActivity(intent);
+                return true;
+            }
+        });
         updateEncryptionPreferences();
     }
 

app/src/main/java/me/impy/aegis/ui/views/GroupAdapter.java

@@ -0,0 +1,62 @@
+package me.impy.aegis.ui.views;
+
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+
+import java.util.ArrayList;
+
+import androidx.recyclerview.widget.RecyclerView;
+import me.impy.aegis.R;
+import me.impy.aegis.db.slots.Slot;
+
+public class GroupAdapter extends RecyclerView.Adapter<GroupHolder> {
+    private GroupAdapter.Listener _listener;
+    private ArrayList<String> _groups;
+
+    public GroupAdapter(GroupAdapter.Listener listener) {
+        _listener = listener;
+        _groups = new ArrayList<>();
+    }
+
+    public void addGroup(String group) {
+        _groups.add(group);
+
+        int position = getItemCount() - 1;
+        if (position == 0) {
+            notifyDataSetChanged();
+        } else {
+            notifyItemInserted(position);
+        }
+    }
+
+    public void removeGroup(String group) {
+        int position = _groups.indexOf(group);
+        _groups.remove(position);
+        notifyItemRemoved(position);
+    }
+
+    @Override
+    public GroupHolder onCreateViewHolder(ViewGroup parent, int viewType) {
+        View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.card_slot, parent, false);
+        return new GroupHolder(view);
+    }
+
+    @Override
+    public void onBindViewHolder(GroupHolder holder, int position) {
+        holder.setData(_groups.get(position));
+        holder.setOnDeleteClickListener(v -> {
+            int position12 = holder.getAdapterPosition();
+            _listener.onRemoveGroup(_groups.get(position12));
+        });
+    }
+
+    @Override
+    public int getItemCount() {
+        return _groups.size();
+    }
+
+    public interface Listener {
+        void onRemoveGroup(String group);
+    }
+}

app/src/main/java/me/impy/aegis/ui/views/GroupHolder.java

@@ -0,0 +1,35 @@
+package me.impy.aegis.ui.views;
+
+import androidx.recyclerview.widget.RecyclerView;
+import android.view.View;
+import android.widget.ImageView;
+import android.widget.LinearLayout;
+import android.widget.TextView;
+
+import me.impy.aegis.R;
+import me.impy.aegis.crypto.KeyStoreHandle;
+import me.impy.aegis.crypto.KeyStoreHandleException;
+import me.impy.aegis.db.slots.FingerprintSlot;
+import me.impy.aegis.db.slots.PasswordSlot;
+import me.impy.aegis.db.slots.RawSlot;
+import me.impy.aegis.db.slots.Slot;
+import me.impy.aegis.helpers.FingerprintHelper;
+
+public class GroupHolder extends RecyclerView.ViewHolder {
+    private TextView _slotName;
+    private ImageView _buttonDelete;
+
+    public GroupHolder(final View view) {
+        super(view);
+        _slotName = view.findViewById(R.id.text_slot_name);
+        _buttonDelete = view.findViewById(R.id.button_delete);
+    }
+
+    public void setData(String groupName) {
+        _slotName.setText(groupName);
+    }
+
+    public void setOnDeleteClickListener(View.OnClickListener listener) {
+        _buttonDelete.setOnClickListener(listener);
+    }
+}