PDF viewer dark theme in Java for 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 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.ui.PdfActivity
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import com.pspdfkit.ui.PdfActivityIntentBuilder
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/**
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 * This example shows how to make [PdfActivity] use custom theme.
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 */
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class DarkThemeExample(context: Context) : SdkExample(context, R.string.darkThemeExampleTitle, R.string.darkThemeExampleDescription) {
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    override fun launchExample(context: Context, configuration: PdfActivityConfiguration.Builder) {
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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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            // You can set the custom theme directly through PdfActivity configuration.
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            configuration.theme(R.style.PSPDFCatalog_Theme_Dark)
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            // Alternatively, you can also define theme on your custom activity directly in AndroidManifest.xml:
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            // <activity
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            //     android:name="YourCustomActivity"
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            //     android:theme="@style/PSPDFCatalog.Theme.Dark" />
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            // To start the DarkThemeActivity create a launch intent using the PdfActivityIntentBuilder
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            val intent = PdfActivityIntentBuilder.fromUri(context, Uri.fromFile(documentFile))
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                .configuration(configuration.build())
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                .build()
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            // Start the DarkThemeActivity for the extracted document.
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            context.startActivity(intent)
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        }
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    }
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}