> 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/page-manipulation/page-label-editor-a.md).

# Page label editor: add or modify PDF pages in Android

Discover how to add or modify page labels in a PDF document with PageLabelDialogFragment. Learn how to customize page numbering and labels for a seamless reading experience. Subscribe to completion ev

The [`PageLabelDialogFragment`](https://sdk.apryse.com/api/android/javadoc/reference/com/pdftron/pdf/dialog/pagelabel/PageLabelDialog.html) allows you to add or modify the page labels in a PDF document. Page labels are typically used to describe a page, such as allowing for non-sequential page numbering (such as the inclusion of Roman numerals at the beginning of a book) or the addition of arbitrary labels.

![](https://226546913-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F0QItsdFBmuuL9ezHimHy%2Fuploads%2Fgit-blob-d4dc4d011e93991121aa9fad2e9c2a2c5cd221dc%2F45fbb90d9b77a3ff893cb92f02c01975e1d2d51e-600x1200.gif?alt=media)

## Show the page label editor

The page label editor can be shown from an activity by calling the following method:

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

```java
public void showPageLabelSettingsDialog(FragmentManager fragmentManager, int fromPage, int toPage, int pageCount) {
    PageLabelDialog dialog = PageLabelDialog.newInstance(fromPage, toPage, pageCount);
    dialog.setStyle(DialogFragment.STYLE_NO_TITLE, R.style.PDFTronAppTheme);
    dialog.show(fragmentManager, PageLabelDialog.TAG);
}
```

{% endcode %}
{% endtab %}

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

```kotlin
fun showPageLabelSettingsDialog(fragmentManager: FragmentManager, fromPage: Int, toPage: Int, pageCount: Int) {
    val dialog = PageLabelDialog.newInstance(fromPage, toPage, pageCount)
    dialog.setStyle(DialogFragment.STYLE_NO_TITLE, R.style.PDFTronAppTheme)
    dialog.show(fragmentManager, PageLabelDialog.TAG)
}
```

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

In order to recieve the inputs from the page label editor, you will also need to subscribe to completion events from the page label dialog:

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

```java
public void observeOnComplete(final AppCompatActivity activity, final PDFViewCtrl pdfViewCtrl) {
    PageLabelSettingViewModel viewModel = ViewModelProviders.of(activity).get(PageLabelSettingViewModel.class);
    viewModel.observeOnComplete(activity, new Observer<Event<PageLabelSetting>>() {
        @Override
        public void onChanged(@Nullable Event<PageLabelSetting> pageLabelSettingEvent) {
            // Handle the completion event from the page label dialog,
            // and change the page labels in PDFViewCtrl
            if (pageLabelSettingEvent != null && !pageLabelSettingEvent.hasBeenHandled()) {
                PageLabelUtils.setPageLabel(pdfViewCtrl, pageLabelSettingEvent.getContentIfNotHandled());
            }
        }
    });
}
```

{% endcode %}
{% endtab %}

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

```kotlin
fun observeOnComplete(activity: AppCompatActivity, pdfViewCtrl: PDFViewCtrl) {
    val viewModel = ViewModelProviders.of(activity).get(PageLabelSettingViewModel::class.java)
    viewModel.observeOnComplete(activity, Observer { pageLabelSettingEvent ->
        // Handle the completion event from the page label dialog,
        // and change the page labels in PDFViewCtrl
        if (pageLabelSettingEvent != null && !pageLabelSettingEvent.hasBeenHandled()) {
            PageLabelUtils.setPageLabel(pdfViewCtrl, pageLabelSettingEvent.contentIfNotHandled!!)
        }
    })
}
```

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


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