Keep Your LibGDX Game Loop Alive With AssetManager

The problem: your render thread waits for disk I/O

You add a character texture to a LibGDX screen and call new Texture("data/player.png") inside create(). On desktop the pause is barely noticeable, but on Android the file read and decompression can stall the application thread for hundreds of milliseconds. The game appears frozen, and if you try to load assets on your own background thread, you risk calling get() before the texture is ready.

The practical takeaway: use LibGDX’s AssetManager to load textures, atlases, sounds, and fonts on a dedicated loader thread. Poll update() every frame, and call get() only after it returns true.

How AssetManager splits the work

The application thread is the main thread where LibGDX invokes render() and your game logic runs. The loader thread is a background thread that AssetManager uses to read files and decode them so rendering can keep going. AssetManager also implements Disposable, which means its dispose() method releases native memory for every asset it loaded.

Loading pattern: queue, poll, retrieve

Instead of constructing assets directly, you tell the manager what to load, let it work between frames, and fetch the finished asset when it is done.

Approach	Render impact	When to call get()
new Texture(...) in create()	Blocks the render thread while the file decodes	Immediately, but may freeze the game
AssetManager with update()	Decodes on the loader thread; rendering continues	Only after update() returns true

Worked example: a desktop loading screen

Add the LibGDX dependency to your desktop module. Run this from a terminal in the project root:

./gradlew desktop:run

No special permissions are required beyond normal Gradle execution. Replace <libgdx-version> with the version already declared in your project’s build.gradle; mismatched versions can cause class-loading errors.

dependencies {
    implementation "com.badlogicgames.gdx:gdx:"
}

This example queues one texture and switches screens only when loading finishes:

package com.example.mygame.screens;

import com.badlogic.gdx.Screen;
import com.badlogic.gdx.assets.AssetManager;
import com.badlogic.gdx.graphics.Texture;

public class LoadingScreen implements Screen {
    private final AssetManager manager = new AssetManager();
    private boolean loaded;

    @Override
    public void show() {
        manager.load("data/player.png", Texture.class);
    }

    @Override
    public void render(float delta) {
        boolean finished = manager.update();
        if (finished && !loaded) {
            Texture player = manager.get("data/player.png", Texture.class);
            loaded = true;
            // transition to gameplay screen here
        }
    }

    @Override
    public void hide() {
        manager.dispose();
    }

    @Override
    public void dispose() {
        manager.dispose();
    }

    // resize, pause, resume omitted for brevity
}

Call get() only after update() returns true. Calling it earlier blocks the application thread until loading completes, which removes the benefit of asynchronous loading and can freeze rendering. Also, never call dispose() on an individual Texture that AssetManager loaded; use manager.dispose() to avoid double-disposal or dangling references.

Limitations and what to verify

• AssetManager is not safe for concurrent load() or get() calls from arbitrary background threads. Coordinate access through the application thread.
• Loader defaults and supported formats vary by LibGDX version. Check the version in build.gradle and read the AssetManager Javadoc for that release.
• Dependency chains are resolved automatically—for example, a TextureAtlas waits for its constituent textures—but you should still verify completion with update() rather than assuming immediate availability.

Practical verification

On desktop, queue a single texture, call update() each frame, and assert that get() returns non-null only after update() returns true. On Android, open Android Studio Memory Profiler, capture a native memory snapshot before and after manager.dispose(), and confirm that texture memory decreases. If it does not, the manager may still hold references or you may have disposed assets individually.

Bottom line

Use AssetManager to keep your LibGDX render thread moving while assets load. Queue assets in show(), poll update() in render(), retrieve assets after completion, and release everything with manager.dispose() when the screen is hidden.