> 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/android/measurement/measurement-a.md).

# Add PDF Measurement Tools in Android

Learn how to create and edit measurement annotations in PDFs using the DocumentActivity and PdfViewCtrlTabHostFragment2 components. Find out how to configure ToolManager and use different measurement

By default, creating and editing measurement annotations in the drop-in components [DocumentActivity](/android/open-save-document/open.md#show-a-document-in-an-activity) and [PdfViewCtrlTabHostFragment2](/android/open-save-document/open.md#display-document-in-fragment-on-android) are automatically enabled unless disabled using [`ToolManagerBuilder`](https://sdk.apryse.com/api/android/javadoc/reference/com/pdftron/pdf/config/ToolManagerBuilder.html). You can learn more about configuring ToolManager [here](/android/annotation/toolmanager-config.md).

To create a measurement annotations, tap and hold on an area of the PDF without any text or annotations to bring up the long-press quick menu. Then find a group called `Measure` in the overflow menu.

There are three measurement tools:

* Distance: [RulerCreate](https://sdk.apryse.com/api/android/javadoc/reference/com/pdftron/pdf/tools/RulerCreate.html)
* Perimeter: [PerimeterMeasureCreate](https://sdk.apryse.com/api/android/javadoc/reference/com/pdftron/pdf/tools/PerimeterMeasureCreate.html)
* Area: [AreaMeasureCreate](https://sdk.apryse.com/api/android/javadoc/reference/com/pdftron/pdf/tools/AreaMeasureCreate.html)

![](https://226546913-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F0QItsdFBmuuL9ezHimHy%2Fuploads%2Fgit-blob-907e3783ada20f7e654355097a03c7193bb70ac1%2F77c37d8737315a2f369d76eaf71e05e707337591-600x1191.gif?alt=media)

## Enable end point snapping

Snapping is useful when you want to precisely place annotations in documents by snapping them to lines & objects. The point snapping API can be used to easily place annotations to the exact location.

![](https://226546913-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F0QItsdFBmuuL9ezHimHy%2Fuploads%2Fgit-blob-18013b0426e6029312439bf72cca0d6f70d6ec22%2F7b385a49c62bd64bae4995fbaeb74323d1fe3516-422x818.gif?alt=media)

This is disabled by default and can be enabled as follows:

{% tabs %}
{% tab title="C#" %}
{% code lineNumbers="true" %}

```csharp
mToolManager.SetSnappingEnabledForMeasurementTools(true);
```

{% endcode %}
{% endtab %}

{% tab title="Java" %}
{% code lineNumbers="true" %}

```java
mToolManager.setSnappingEnabledForMeasurementTools(true);
```

{% endcode %}
{% endtab %}

{% tab title="Kotlin" %}
{% code lineNumbers="true" %}

```kotlin
mToolManager.isSnappingEnabledForMeasurementTools = true
```

{% endcode %}
{% endtab %}
{% endtabs %}

## Calibration

The **Calibrate** menu option for measurement annotations allows you to determine a PDF's scale, enabling accurate measurements.

![](https://226546913-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F0QItsdFBmuuL9ezHimHy%2Fuploads%2Fgit-blob-5741166704fdc85117ca7c9af801c7e3632f5f0d%2Ff6f7e44402cda99a38b15944e6417c69b7782f84-600x1191.gif?alt=media)


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