Java 我的2d android游戏有问题吗

嘿，伙计们，我有点傻，所以不要对我太苛刻。 我正在为Android开发一个2D游戏，我有点麻烦。 它几乎完成了，但我希望在我的游戏中收集硬币，我希望他们在我的障碍物随机产卵。我已经完成了硬币的主代码，它们在我的障碍物上盘旋，你可以收集它们，但我不知道如何让它们随机繁殖：我希望你能帮我这里是我的代码： 我的硬币课：

enter code herepublic class Coin  extends GameObject{
private Bitmap spritesheet;
private double dya;
private boolean playing;
private long startTime;
private Animation animation = new Animation();
private int num = 0;
private Obsticals obsticals;

public Coin(Bitmap res, int w, int h, int numFrames) {
    x = GamePanel.WIDTH + 20;
    y = GamePanel.HEIGHT - GamePanel.HEIGHT / 4 - 200;
    dy = 0;
    dx = +GamePanel.MOVESPEED;
    height = h;
    width = w;


    Bitmap[] image = new Bitmap[numFrames];
    spritesheet = res;

    for (int i = 0; i < image.length; i++)
    {
        image[i] = Bitmap.createBitmap(spritesheet, i*width, 0, width, height);
    }
    animation.setFrames(image);
    animation.setDelay(100);

}
public void update()
{
        if (y <= 50) {
            resetO();
        }
        x += dx;
        long elapsed = (System.nanoTime() - startTime) / 1000000;
        if (elapsed > 10000) {
            dx = dx - 1;
            startTime = System.nanoTime();
            System.out.println(dx);
            num = num + 30;
        }
        if (dx <= -25) {
            dx = -24;
        }
        if (num >= 200) {
            num = 200;
        }

}
public void draw(Canvas canvas)
{
    canvas.drawBitmap(animation.getImage(),x,y,null);


}
public void resetO(){
    x = GamePanel.WIDTH + 20;
    y = GamePanel.HEIGHT - GamePanel.HEIGHT / 4 - 200;
    dy = 0;
    dx = +GamePanel.MOVESPEED;
    num = 0;

}
public void coinCollected(){

   resetO();
}


}

---

我希望你能帮助我

这里有一个函数，用于生成一个随机位置的球。希望您能适应您的需要：

public void spawn() {
    /**
     * Spawns the ball at a random position
     */
    Random random = new Random();

    radius = random.nextFloat() * 100f + 50f;

    float velocity_x = random.nextFloat() * 70.0f + 40.0f;
    float position_y = random.nextFloat() * (screen_height - 120 - radius);

    position = new Vector(screen_width, position_y);
    paused_velocity = velocity = new Vector(-velocity_x, 0.0f);

}

---

来源：Virajmahesh | GitHub:落球

这里有一个函数，可以将球生成到随机位置。希望您能适应您的需要：

public void spawn() {
    /**
     * Spawns the ball at a random position
     */
    Random random = new Random();

    radius = random.nextFloat() * 100f + 50f;

    float velocity_x = random.nextFloat() * 70.0f + 40.0f;
    float position_y = random.nextFloat() * (screen_height - 120 - radius);

    position = new Vector(screen_width, position_y);
    paused_velocity = velocity = new Vector(-velocity_x, 0.0f);

}

资料来源：Virajmahesh | GitHub：落球