> For the complete documentation index, see [llms.txt](https://docs.apryse.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.apryse.com/xamarin/guides/viewer-components/annotation-toolbar-a.md).
# Annotation toolbar customization in Xamarin
Learn how to create a custom annotation toolbar in Xamarin.Android with AnnotationToolbarComponent. Customize tools, show/hide buttons, and switch between annotation creation tools easily. See the ico
{% hint style="info" %}
**This tutorial only applies to Xamarin.Android. See Xamarin.iOS equivalent here .**
{% endhint %}
[`AnnotationToolbarComponent`](https://sdk.apryse.com/api/xamarinandroid/tools/api/pdftron.PDF.Widget.Toolbar.Component.AnnotationToolbarComponent.html) is a class that contains the logic and views that make up the annotation toolbar. The annotation toolbar can be customized to contain a number of annotation creation tools button as well as any custom button. With the annotation toolbar, users are able to conveniently create annotations and switch between different tools.
The buttons on the annotation toolbar are contained in two groups: the scrollable region (left) and the sticky region (right). The scrollable region can contain any number of buttons and scrolling is used to access buttons that are off-screen. Buttons in the sticky region will always show on the screen and will not be scrollable.
{% hint style="info" %}
**To learn more about each icon, see the icon cheat sheet .**
{% endhint %}
## Create a custom annotation toolbar
The annotation toolbar allows users to easily switch tools when adding annotations to a document. To add an annotation toolbar to your app, first define some layout groups in your app that will contain the annotation toolbar:
{% tabs %}
{% tab title="XML" %}
{% code lineNumbers="true" %}
```xml
```
{% endcode %}
{% endtab %}
{% endtabs %}
Then in your activity, setup your `AnnotationToolbarComponent` with [`ToolManager`](https://sdk.apryse.com/api/xamarinandroid/tools/api/pdftron.PDF.Tools.ToolManager.html) and attach the required ViewModel classes:
{% tabs %}
{% tab title="C#" %}
{% code lineNumbers="true" %}
```csharp
AnnotationToolbarComponent annotationToolbarComponent;
// ...
private void SetupAnnotationToolbar(ToolManager toolManager)
{
// First find our container view group
var mToolbarContainer = FindViewById(Resource.Id.annotation_toolbar_container);
// Then setup ToolManager and related ViewModels with AnnotationToolbarComponent
// Remember to initialize your ToolManager before calling below
var vmProvider = ViewModelProviders.Of(this);
var toolManagerVm = (ToolManagerViewModel)vmProvider.Get(Java.Lang.Class.FromType(typeof(ToolManagerViewModel)));
toolManagerVm.ToolManager = toolManager;
var presetVm = (PresetBarViewModel)vmProvider.Get(Java.Lang.Class.FromType(typeof(PresetBarViewModel)));
var annotToolbarVm = (AnnotationToolbarViewModel)vmProvider.Get(Java.Lang.Class.FromType(typeof(AnnotationToolbarViewModel)));
// Create our UI component for the annotation toolbar
annotationToolbarComponent = new AnnotationToolbarComponent(this, annotToolbarVm, presetVm, toolManagerVm, mToolbarContainer);
}
```
{% endcode %}
{% endtab %}
{% endtabs %}
Finally, you can customize the annotation toolbar by either using one of our default toolbars or creating a custom toolbar from scratch.
{% tabs %}
{% tab title="C#" %}
{% code lineNumbers="true" %}
```csharp
// Use a default toolbar
annotationToolbarComponent.InflateWithBuilder(DefaultToolbars.DefaultAnnotateToolbar);
// Or create a custom toolbar from scratch
annotationToolbarComponent.InflateWithBuilder(
AnnotationToolbarBuilder.WithTag("Custom Toolbar")
// Add some pre-defined tools that will be handled internally using ToolManager
.AddToolButton(ToolbarButtonType.Square, 100)
.AddToolButton(ToolbarButtonType.Ink, 102)
.AddToolButton(ToolbarButtonType.FreeHighlight, 103)
.AddToolButton(ToolbarButtonType.Eraser, 104)
// We can also add a custom button to handle ourselves, for example here
// we have added a "favorites" button that contains a star icon
.AddCustomButton(Resource.String.favorites, Resource.Drawable.annotation_note_icon_star_fill, 105)
.AddToolStickyButton(ToolbarButtonType.Undo, 106)
.AddToolStickyButton(ToolbarButtonType.Redo, 107)
);
```
{% endcode %}
{% endtab %}
{% endtabs %}
## Show and hide annotation toolbar
You can show and hide the toolbar by calling [`AnnotationToolbarComponent.show(boolean)`](https://sdk.apryse.com/api/xamarinandroid/tools/api/pdftron.PDF.Widget.Toolbar.Component.AnnotationToolbarComponent.html) and [`AnnotationToolbarComponent.hide(boolean)`](https://sdk.apryse.com/api/xamarinandroid/tools/api/pdftron.PDF.Widget.Toolbar.Component.AnnotationToolbarComponent.html).
## Hide annotation toolbar items
If you have used `ToolManager` to hide certain tools, then the associated tool buttons will also be hidden in the annotation toolbar.
### Hide tool buttons
If there are tools that you would like to remove from the annotation toolbar, you can disable them by calling [`ToolManager.disableToolMode(ToolMode[])`](https://sdk.apryse.com/api/xamarinandroid/tools/api/pdftron.PDF.Tools.ToolManager.html). This will also hide the tool in the quick menu. For example:
{% tabs %}
{% tab title="C#" %}
{% code lineNumbers="true" %}
```csharp
// Disable TextHighlightCreate tool, TextUnderlineCreate tool,
// TextSquigglyCreate tool and TextStrikeoutCreate tool
mToolManager.DisableToolMode(new ToolManager.ToolMode[] {
ToolManager.ToolMode.TextHighlight,
ToolManager.ToolMode.TextUnderline,
ToolManager.ToolMode.TextSquiggly,
ToolManager.ToolMode.TextStrikeout
});
```
{% endcode %}
{% endtab %}
{% endtabs %}
For reference, a mapping of `ToolMode` to button icons is shown below:
| Icon | ToolMode |
| -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ----------------------- |
|  | `RECT_CREATE` |
|  | `OVAL_CREATE` |
|  | `POLYLINE_CREATE` |
|  | `POLYGON_CREATE` |
|  | `CLOUD_CREATE` |
|  | `LINE_CREATE` |
|  | `ARROW_CREATE` |
|  | `RULER_CREATE` |
|  | `TEXT_CREATE` |
|  | `CALLOUT_CREATE` |
|  | `TEXT_ANNOT_CREATE` |
|  | `INK_CREATE` |
|  | `INK_ERASER` |
|  | `SIGNATURE` |
|  | `STAMPER` |
|  | `RUBBER_STAMPER` |
|  | `FREE_HIGHLIGHTER` |
|  | `TEXT_HIGHLIGHT` |
|  | `TEXT_UNDERLINE` |
|  | `TEXT_SQUIGGLY` |
|  | `TEXT_STRIKEOUT` |
|  | `ANNOT_EDIT_RECT_GROUP` |
## Annotation toolbar listener
You can set an [`AnnotationButtonClickListener`](https://sdk.apryse.com/api/xamarinandroid/tools/api/pdftron.PDF.Widget.Toolbar.Component.AnnotationToolbarComponent.IAnnotationButtonClickListener.html) to be notified of annotation toolbar button click events.
## Edit annotations continuously
For continuous annotation creation, `AnnotationToolbarComponent` will use value set by `PdfViewCtrlSettingsManager.setContinuousAnnotationEdit(Context, boolean)` (by default true). If continuous annotation editing is disabled, then the tool button will be de-selected in the annotation toolbar after creating an annotation.
## Appearance styles
In order to customize the appearance of UI elements in your annotation toolbar, you can define a new style that extends `PTAnnotationToolbarTheme` inside your `res\values\style.xml` file and pass it as an attribute to your viewer's theme named `pt_annotation_toolbar_style`. For more information on customizing the style of UI components, please take a look at our [viewer theme guide ](/xamarin/guides/viewer-components/custom-theme-a.md).
---
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