--- title: "Memory Pressure Recovery" canonical_url: "https://www.nutrient.io/guides/android/samples/memory-pressure-recovery-kotlin/" md_url: "https://www.nutrient.io/guides/android/samples/memory-pressure-recovery-kotlin.md" last_updated: "2026-08-15T02:14:45.574Z" description: "Simulate critical memory pressure on heavy documents and observe render abort, backoff, and automatic recovery." --- # Memory Pressure Recovery Simulate critical memory pressure on heavy documents and observe render abort, backoff, and automatic recovery. [Get Started](https://www.nutrient.io/sdk/android/getting-started.md) [All Samples](https://www.nutrient.io/guides/android/samples.md) [Download](https://www.nutrient.io/guides/android/downloads.md) [Launch Demo](https://www.nutrient.io/demo/) --- ```kotlin /* * Copyright © 2026 PSPDFKit GmbH. All rights reserved. * * The PSPDFKit Sample applications are licensed with a modified BSD license. * Please see License for details. This notice may not be removed from this file. */ package com.pspdfkit.catalog.examples.kotlin import android.content.Context import android.content.Intent import androidx.appcompat.app.AlertDialog import com.pspdfkit.catalog.R import com.pspdfkit.catalog.SdkExample import com.pspdfkit.catalog.ui.DocumentPickerActivity import com.pspdfkit.configuration.activity.PdfActivityConfiguration import com.pspdfkit.document.PdfDocument import com.pspdfkit.ui.PdfActivity /** * Exercises the SDK's native memory-pressure handling on heavy documents, with the full * [PdfActivity] UI (including the thumbnail bar) active. * * Under sustained memory pressure the SDK sends critical memory notifications into core, * which trims page caches and aborts in-flight page-content parses; an aborted page backs * off (blank, no auto-retry) and is re-rendered automatically once memory recovers. A * rasterisation that already started is allowed to finish. If pressure persists despite * the automatic recovery, [com.pspdfkit.listeners.OnSustainedMemoryPressureListener] * fires (once per episode) so the host can offer to close the document — demonstrated * here with a dialog. * * Open a large document and scroll through its high-resolution pages to drive the device * into real memory pressure, then watch the SDK trim caches, blank and re-render pages, and * — if pressure persists — fire the host advisory dialog. Observe with: * `adb logcat -s PSPDF.MemTrace MemoryHandling DocumentProvider PSPDF.MemoryNotHandler`. */ class MemoryPressureExample(context: Context) : SdkExample( context, R.string.memoryPressureExampleTitle, R.string.memoryPressureExampleDescription, ) { override fun launchExample(context: Context, configuration: PdfActivityConfiguration.Builder) { val intent = Intent(context, MemoryPressureExamplePickerActivity::class.java) intent.putExtra(DocumentPickerActivity.EXTRA_CONFIGURATION, configuration.build()) context.startActivity(intent) } } /** Activity that lets the user choose between picking a PDF and using the default document. */ class MemoryPressureExamplePickerActivity : DocumentPickerActivity() { override val targetActivityClass = MemoryPressureActivity::class.java } class MemoryPressureActivity : PdfActivity() { override fun onDocumentLoaded(document: PdfDocument) { super.onDocumentLoaded(document) // The advisory only fires when critical pressure persists across several memory // polls despite the SDK's automatic recovery — transient episodes stay silent. // The recommended host response is to release the document. pdfFragment?.setOnSustainedMemoryPressureListener { AlertDialog.Builder(this).setTitle("Device is low on memory").setMessage( "This document needs more memory than the device can sustain. Some pages may " + "stay blank until memory recovers. Closing the document is recommended.", ).setPositiveButton("Close document") { _, _ -> finish() }.setNegativeButton("Keep viewing", null).show() } } } ``` This code sample is an example that illustrates how to use our SDK. 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