---
title: "Android PDF viewer with form fill support | Nutrient SDK"
canonical_url: "https://www.nutrient.io/guides/android/forms/fill-form-fields/using-the-ui/"
md_url: "https://www.nutrient.io/guides/android/forms/fill-form-fields/using-the-ui.md"
last_updated: "2026-05-23T00:08:17.987Z"
description: "Filling form fields using the UI provided by Nutrient Android SDK is extremely simple and intuitive."
---

# Form field support in our Android PDF viewer

Filling form fields using the UI provided by Nutrient Android SDK is extremely simple and intuitive.

Forms fields can be of different types, as defined by the PDF specification. They help cover a wide range of standards — from text fields to signatures fields.

## Text field![Text field UI](@/assets/guides/android/forms/fill-form-fields/text-field.png)

Text fields accept alphanumeric text.

## Checkbox

Checkboxes are fields that indicate an on/off state.

## Radio button

Radio buttons present a selection of choices.

## Combo box![Combo box UI](@/assets/guides/android/forms/fill-form-fields/combo-box.png)

Combo boxes are dropdown lists of choices.

## List box![List box UI](@/assets/guides/android/forms/fill-form-fields/list-box.png)

List boxes are scrollable lists of choices.

## Signature

Signature fields serve to present unique [digital signatures](https://www.nutrient.io/guides/android/signatures.md).

## Button

Buttons represent assignable actions.

Buttons are usually associated with forms, but they can be added to any document. Buttons let users initiate one or more actions — like opening files, playing sounds, or submitting data to a server.
---

## Related pages

- [Fill PDF form fields programmatically on Android](/guides/android/forms/form-filling.md)
- [Attach files to PDF form fields on Android](/guides/android/forms/fill-form-fields/attach-a-file.md)
- [Undo and redo for PDF forms on Android](/guides/android/forms/fill-form-fields/undo-and-redo.md)
- [Detecting user clicks in PDF form elements on Android](/guides/android/forms/fill-form-fields/detect-clicks.md)
- [Detect user input in Android PDF forms](/guides/android/forms/fill-form-fields/detect-user-input.md)