Added folder search

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

@@ -839,6 +839,19 @@ public class AdapterFolder extends RecyclerView.Adapter<AdapterFolder.ViewHolder
         diff.dispatchUpdatesTo(this);
     }
 
+    public int search(String query, int result) {
+        int pos = 0;
+        if (!TextUtils.isEmpty(query))
+            for (int i = 0; i < items.size(); i++)
+                if (items.get(i).getDisplayName(context).toLowerCase().contains(query.toLowerCase())) {
+                    pos = i;
+                    if (--result < 0)
+                        break;
+                }
+
+        return pos;
+    }
+
     private List<TupleFolderEx> getHierarchical(List<TupleFolderEx> parents, int indentation) {
         List<TupleFolderEx> result = new ArrayList<>();
 

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

@@ -22,8 +22,13 @@ package eu.faircode.email;
 import android.app.Dialog;
 import android.content.Context;
 import android.os.Bundle;
+import android.text.Editable;
+import android.text.TextUtils;
+import android.text.TextWatcher;
 import android.view.LayoutInflater;
 import android.view.View;
+import android.widget.EditText;
+import android.widget.ImageButton;
 import android.widget.TextView;
 
 import androidx.annotation.NonNull;
@@ -37,6 +42,8 @@ import java.util.List;
 import static android.app.Activity.RESULT_OK;
 
 public class FragmentDialogFolder extends FragmentDialogBase {
+    private int result = 0;
+
     @NonNull
     @Override
     public Dialog onCreateDialog(@Nullable Bundle savedInstanceState) {
@@ -46,11 +53,13 @@ public class FragmentDialogFolder extends FragmentDialogBase {
 
         final View dview = LayoutInflater.from(getContext()).inflate(R.layout.dialog_folder_select, null);
         final TextView tvNoFolder = dview.findViewById(R.id.tvNoFolder);
+        final EditText etSearch = dview.findViewById(R.id.etSearch);
+        final ImageButton ibNext = dview.findViewById(R.id.ibNext);
         final RecyclerView rvFolder = dview.findViewById(R.id.rvFolder);
         final ContentLoadingProgressBar pbWait = dview.findViewById(R.id.pbWait);
 
         rvFolder.setHasFixedSize(false);
-        LinearLayoutManager llm = new LinearLayoutManager(getContext());
+        final LinearLayoutManager llm = new LinearLayoutManager(getContext());
         rvFolder.setLayoutManager(llm);
 
         final AdapterFolder adapter = new AdapterFolder(getContext(), getViewLifecycleOwner(),
@@ -67,6 +76,38 @@ public class FragmentDialogFolder extends FragmentDialogBase {
 
         rvFolder.setAdapter(adapter);
 
+        etSearch.addTextChangedListener(new TextWatcher() {
+            @Override
+            public void beforeTextChanged(CharSequence s, int start, int count, int after) {
+            }
+
+            @Override
+            public void onTextChanged(CharSequence s, int start, int before, int count) {
+                result = 0;
+                String query = s.toString().toLowerCase();
+                int pos = adapter.search(query, result);
+                llm.scrollToPositionWithOffset(pos, 0);
+                ibNext.setEnabled(!TextUtils.isEmpty(query));
+            }
+
+            @Override
+            public void afterTextChanged(Editable s) {
+            }
+        });
+
+        ibNext.setEnabled(false);
+        ibNext.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                result++;
+                String query = etSearch.getText().toString();
+                int pos = adapter.search(query, result);
+                llm.scrollToPositionWithOffset(pos, 0);
+                if (pos == adapter.search(query, result + 1))
+                    result = 0;
+            }
+        });
+
         Bundle args = new Bundle();
         args.putLong("account", account);
 

app/src/main/res/layout/dialog_folder_select.xml

@@ -2,7 +2,8 @@
 <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     android:layout_width="match_parent"
-    android:layout_height="wrap_content">
+    android:layout_height="wrap_content"
+    android:padding="12dp">
 
     <TextView
         android:id="@+id/tvNoFolder"
@@ -16,16 +17,37 @@
         app:layout_constraintStart_toStartOf="parent"
         app:layout_constraintTop_toTopOf="parent" />
 
+    <EditText
+        android:id="@+id/etSearch"
+        android:layout_width="0dp"
+        android:layout_height="wrap_content"
+        android:layout_marginEnd="12dp"
+        android:hint="@string/title_search"
+        app:layout_constraintEnd_toStartOf="@+id/ibNext"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent" />
+
+    <ImageButton
+        android:id="@+id/ibNext"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:background="?android:attr/selectableItemBackgroundBorderless"
+        android:padding="6dp"
+        app:layout_constraintBottom_toBottomOf="@+id/etSearch"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintTop_toTopOf="@+id/etSearch"
+        app:srcCompat="@drawable/baseline_fast_forward_24" />
+
     <androidx.recyclerview.widget.RecyclerView
         android:id="@+id/rvFolder"
         android:layout_width="0dp"
         android:layout_height="wrap_content"
-        android:padding="12dp"
+        android:layout_marginTop="6dp"
         android:scrollbarStyle="outsideOverlay"
         android:scrollbars="vertical"
         app:layout_constraintEnd_toEndOf="parent"
         app:layout_constraintStart_toStartOf="parent"
-        app:layout_constraintTop_toTopOf="parent" />
+        app:layout_constraintTop_toBottomOf="@+id/etSearch" />
 
     <eu.faircode.email.ContentLoadingProgressBar
         android:id="@+id/pbWait"