Android PDF viewer UI customization using Kotlin

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/*
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 *   Copyright © 2020-2025 PSPDFKit GmbH. All rights reserved.
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 *
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 *   The PSPDFKit Sample applications are licensed with a modified BSD license.
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 *   Please see License for details. This notice may not be removed from this file.
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 */
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package com.pspdfkit.catalog.examples.kotlin
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import android.content.Context
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import android.net.Uri
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import android.os.Bundle
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import android.view.Menu
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import android.view.MenuItem
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import android.view.View
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import com.pspdfkit.catalog.R
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import com.pspdfkit.catalog.SdkExample
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import com.pspdfkit.catalog.tasks.ExtractAssetTask
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import com.pspdfkit.configuration.activity.PdfActivityConfiguration
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import com.pspdfkit.configuration.activity.TabBarHidingMode
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import com.pspdfkit.configuration.activity.UserInterfaceViewMode
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import com.pspdfkit.ui.PdfActivity
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import com.pspdfkit.ui.PdfActivityIntentBuilder
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/**
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 * This example shows how to change user interface view modes. To do so, it subclasses the
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 * [PdfActivity] and calls [PdfActivity.setUserInterfaceViewMode] method
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 * to toggle between various user interface view modes.
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 */
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class UserInterfaceViewModesExample(context: Context) : SdkExample(context, R.string.userInterfaceViewModesExampleTitle, R.string.userInterfaceViewModesExampleDescription) {
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    override fun launchExample(context: Context, configuration: PdfActivityConfiguration.Builder) {
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        // Configure the PdfActivity to use the examples subclass. This is
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        // important if your app wants to tweak the default behavior of its implementation.
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        configuration.layout(R.layout.user_interface_view_modes_activity)
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        // Hide navigation buttons and tab bar since they are not used by this example.
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        configuration.navigationButtonsEnabled(false)
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        configuration.setTabBarHidingMode(TabBarHidingMode.HIDE)
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        // The custom layout has no content editor. In order to prevent the activity from accessing
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        // it we have to deactivate it in the configuration.
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        configuration.contentEditingEnabled(false)
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        // Disable measurements as well
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        configuration.setMeasurementToolsEnabled(false)
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        // We use a custom utility class to extract the example document from the assets.
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        ExtractAssetTask.extract(WELCOME_DOC, title, context) { documentFile ->
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            // Launch the custom example activity using the document and configuration.
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            val intent = PdfActivityIntentBuilder.fromUri(context, Uri.fromFile(documentFile))
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                .configuration(configuration.build())
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                .activityClass(UserInterfaceViewModesActivity::class)
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                .build()
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            // Start the UserInterfaceViewModesActivity for the extracted document.
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            context.startActivity(intent)
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        }
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    }
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}
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/**
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 * This subclass of [PdfActivity] adds a set of actions to change user interface view modes.
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 */
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class UserInterfaceViewModesActivity : PdfActivity() {
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    override fun onCreate(savedInstanceState: Bundle?) {
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        super.onCreate(savedInstanceState)
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        findViewById<View>(R.id.show_user_interface_button).setOnClickListener {
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            // This method overrides all restraints on showing user interface.
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            // Shows user interface even when using USER_INTERFACE_VIEW_MODE_HIDDEN.
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            setUserInterfaceVisible(true, true)
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        }
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        findViewById<View>(R.id.hide_user_interface_button).setOnClickListener {
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            // This method overrides all restraints on hiding user interface.
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            // Hides user interface even when using USER_INTERFACE_MODE_VISIBLE.
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            setUserInterfaceVisible(false, true)
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        }
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    }
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    override fun onCreateOptionsMenu(menu: Menu): Boolean {
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        super.onCreateOptionsMenu(menu)
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        menuInflater.inflate(R.menu.user_interface_view_modes_menu, menu)
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        return true
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    }
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    override fun onOptionsItemSelected(item: MenuItem): Boolean {
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        val newUserInterfaceViewMode = when (item.itemId) {
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            R.id.user_interface_view_mode_automatic -> {
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                UserInterfaceViewMode.USER_INTERFACE_VIEW_MODE_AUTOMATIC
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            }
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            R.id.user_interface_view_mode_automatic_border_pages -> {
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                UserInterfaceViewMode.USER_INTERFACE_VIEW_MODE_AUTOMATIC_BORDER_PAGES
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            }
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            R.id.user_interface_view_mode_visible -> {
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                UserInterfaceViewMode.USER_INTERFACE_VIEW_MODE_VISIBLE
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            }
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            R.id.user_interface_view_mode_hidden -> {
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                UserInterfaceViewMode.USER_INTERFACE_VIEW_MODE_HIDDEN
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            }
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            R.id.user_interface_view_mode_manual -> {
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                UserInterfaceViewMode.USER_INTERFACE_VIEW_MODE_MANUAL
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            }
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            else -> null
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        } ?: return super.onOptionsItemSelected(item)
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        this.userInterfaceViewMode = newUserInterfaceViewMode
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        return true
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    }
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    override fun onUserInterfaceVisibilityChanged(visible: Boolean) {
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        super.onUserInterfaceVisibilityChanged(visible)
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        // You can monitor UI visibility changes by overriding this method.
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    }
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}