Added search folder interface

app/src/main/java/eu/faircode/email/FragmentFolders.java

@@ -49,6 +49,7 @@ import android.widget.Toast;
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
 import androidx.appcompat.app.AlertDialog;
+import androidx.appcompat.widget.SearchView;
 import androidx.constraintlayout.widget.Group;
 import androidx.core.app.NotificationCompat;
 import androidx.core.view.MenuCompat;
@@ -108,6 +109,7 @@ public class FragmentFolders extends FragmentBase {
     private boolean primary;
     private boolean show_hidden = false;
     private boolean show_flagged = false;
+    private String searching = null;
     private AdapterFolder adapter;
 
     private NumberFormat NF = NumberFormat.getNumberInstance();
@@ -282,10 +284,20 @@ public class FragmentFolders extends FragmentBase {
         return view;
     }
 
+    @Override
+    public void onSaveInstanceState(Bundle outState) {
+        outState.putString("fair:searching", searching);
+        super.onSaveInstanceState(outState);
+    }
+
     @Override
     public void onActivityCreated(@Nullable Bundle savedInstanceState) {
         super.onActivityCreated(savedInstanceState);
 
+        if (savedInstanceState != null)
+            searching = savedInstanceState.getString("fair:searching");
+        adapter.search(searching);
+
         SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(getContext());
         boolean folder_actions = prefs.getBoolean("folder_actions", false);
         boolean folder_sync = prefs.getBoolean("folder_sync", false);
@@ -456,6 +468,37 @@ public class FragmentFolders extends FragmentBase {
     @Override
     public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
         inflater.inflate(R.menu.menu_folders, menu);
+
+        MenuItem menuSearch = menu.findItem(R.id.menu_search_folder);
+        SearchView searchView = (SearchView) menuSearch.getActionView();
+        searchView.setQueryHint(getString(R.string.title_search));
+
+        if (TextUtils.isEmpty(searching))
+            menuSearch.collapseActionView();
+        else {
+            menuSearch.expandActionView();
+            searchView.setQuery(searching, true);
+        }
+
+        searchView.setOnQueryTextListener(new SearchView.OnQueryTextListener() {
+            @Override
+            public boolean onQueryTextChange(String newText) {
+                if (getView() != null) {
+                    searching = newText;
+                    adapter.search(newText);
+                }
+                return true;
+            }
+
+            @Override
+            public boolean onQueryTextSubmit(String query) {
+                searching = query;
+                adapter.search(query);
+                return true;
+            }
+        });
+
+
         MenuCompat.setGroupDividerEnabled(menu, true);
         super.onCreateOptionsMenu(menu, inflater);
     }
@@ -502,6 +545,9 @@ public class FragmentFolders extends FragmentBase {
         } else if (itemId == R.id.menu_subscribed_only) {
             onMenuSubscribedOnly();
             return true;
+        } else if (itemId == R.id.menu_search_folder) {
+            onMenuSearchFolder(item);
+            return true;
         } else if (itemId == R.id.menu_apply_all) {
             onMenuApplyToAll();
             return true;
@@ -592,6 +638,13 @@ public class FragmentFolders extends FragmentBase {
         adapter.setSubscribedOnly(subscribed_only);
     }
 
+    private void onMenuSearchFolder(MenuItem item) {
+        if (item.isActionViewExpanded())
+            item.collapseActionView();
+        else
+            item.expandActionView();
+    }
+
     private void onMenuApplyToAll() {
         Bundle args = new Bundle();
         args.putLong("account", account);

app/src/main/res/menu/menu_folders.xml

@@ -48,6 +48,12 @@
     </group>
 
     <group android:id="@+id/group_operations">
+        <item
+            android:id="@+id/menu_search_folder"
+            android:title="@string/title_search"
+            app:actionViewClass="androidx.appcompat.widget.SearchView"
+            app:showAsAction="collapseActionView|never" />
+
         <item
             android:id="@+id/menu_apply_all"
             android:title="@string/title_apply_to_all"