ui控件找不到问题

[Monsterimpl]

package com.mygdx.game;

import com.badlogic.gdx.ApplicationAdapter;
import com.badlogic.gdx.Gdx;
import com.badlogic.gdx.graphics.GL20;
import com.badlogic.gdx.graphics.Texture;
import com.badlogic.gdx.scenes.scene2d.Stage;
import com.badlogic.gdx.scenes.scene2d.ui.Button;
import com.badlogic.gdx.scenes.scene2d.utils.TextureRegionDrawable;
import com.badlogic.gdx.utils.viewport.StretchViewport;

public class MyGame3 extends ApplicationAdapter {

//图片控件

Stage stage;

Button button;

Texture up;

Texture drown;

TextureRegionDrawable u;

TextureRegionDrawable d;

@Override
public void create() {

    up = new Texture(Gdx.files.internal("anniu/QQ20240820-103716.png"));
    drown = new Texture(Gdx.files.internal("anniu/QQ20240820-103704.png"));

    u = new TextureRegionDrawable(up);
    d = new TextureRegionDrawable(drown);

    // 创建ButtonStyle
    Button.ButtonStyle style = new Button.ButtonStyle();
    style.up = u;
    style.down = d;

    // 创建按钮
    button = new Button(style);

    stage = new Stage(new StretchViewport(800, 480));

    stage.addActor(button);

    button.setPosition(100, 100);

}

@Override
public void render() {
    Gdx.gl.glClearColor(1, 1, 1, 1);
    Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT);
    stage.act();

    stage.draw();

}

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

}
点击图片按钮没有变化不知道为什么（图片文件路径没有问题）

[Monsterimpl]

    Gdx.input.setInputProcessor(stage);将对应演员所在的舞台作为参数传递