Merge remote-tracking branch 'origin/enhance-category-handling' into enhance-category-handling

# Conflicts:
#	app/src/main/java/it/niedermann/owncloud/notes/android/fragment/CategoryDialogFragment.java
#	app/src/main/res/layout/dialog_change_category.xml

app/src/main/java/it/niedermann/owncloud/notes/android/fragment/CategoryDialogFragment.java

@@ -15,7 +15,6 @@ import android.widget.EditText;
 
 import androidx.annotation.NonNull;
 import androidx.appcompat.app.AppCompatDialogFragment;
-import androidx.fragment.app.Fragment;
 import androidx.recyclerview.widget.RecyclerView;
 
 import java.util.List;

app/src/main/java/it/niedermann/owncloud/notes/model/CategoryAdapter.java

@@ -0,0 +1,71 @@
+package it.niedermann.owncloud.notes.model;
+
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.TextView;
+
+import androidx.annotation.NonNull;
+import androidx.recyclerview.widget.RecyclerView;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import butterknife.BindView;
+import butterknife.ButterKnife;
+import it.niedermann.owncloud.notes.R;
+
+public class CategoryAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
+
+    private List<String> categoryList;
+
+    public CategoryAdapter() {
+        this.categoryList = new ArrayList<>();
+    }
+
+    /**
+     * Updates the item list and notifies respective view to update.
+     *
+     * @param categoryList List of items to be set
+     */
+    public void setCategoryList(@NonNull List<String> categoryList) {
+        this.categoryList = categoryList;
+        notifyDataSetChanged();
+    }
+
+    /**
+     * Adds the given note to the top of the list.
+     *
+     * @param category Category that should be added.
+     */
+    public void add(@NonNull String category) {
+        categoryList.add(0, category);
+        notifyItemInserted(0);
+        notifyItemChanged(0);
+    }
+
+    @Override
+    public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
+        return new CategoryViewHolder(LayoutInflater.from(parent.getContext()).inflate(R.layout.dialog_change_category_single, parent, false));
+    }
+
+    @Override
+    public void onBindViewHolder(final RecyclerView.ViewHolder holder, int position) {
+        ((CategoryViewHolder) holder).title.setText(categoryList.get(position));
+    }
+
+    @Override
+    public int getItemCount() {
+        return categoryList.size();
+    }
+
+    static class CategoryViewHolder extends RecyclerView.ViewHolder {
+        @BindView(R.id.title)
+        TextView title;
+
+        CategoryViewHolder(View view) {
+            super(view);
+            ButterKnife.bind(this, view);
+        }
+    }
+}

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

@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:orientation="vertical" android:layout_width="match_parent"
+    android:layout_height="match_parent">
+    <TextView
+        android:id="@+id/title"
+        android:padding="36dp"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:hint="Category" />
+</LinearLayout>