Android应用程序中的随机坐标

Question

我有一个移动的精灵的应用程序。我想要做的是让精灵的起始位置是随机的。我可以用'x'坐标，我只想'y'坐标是随机的。

在下面的代码中，我设置了一个随机对象，我有一个'y'坐标集，但我不知道如何结婚这两个，所以它开始在一个随机的地方。理想情况下，我希望精灵在随机位置每次熄灭屏幕，回来的，但首先我想它在随机位置开始时间启动：

package cct.mad.lab; 

import android.graphics.Bitmap; 
import android.graphics.BitmapFactory; 
import android.graphics.Canvas; 

import java.util.Random; 


public class Sprite { 

//x,y position of sprite - initial position (0,50) 
private int x = 0; 
private int y = 50; 
private int xSpeed = 80;//Horizontal increment of position (speed) 
private int ySpeed = 5;// Vertical increment of position (speed) 
private GameView gameView; 
private Bitmap spritebmp; 
//Width and Height of the Sprite image 
private int bmp_width; 
private int bmp_height; 
// Needed for new random coordinates. 
private Random random = new Random(); 



public Sprite(GameView gameView) { 
     this.gameView=gameView; 
     spritebmp = BitmapFactory.decodeResource(gameView.getResources(), 
       R.drawable.sprite_robot); 
     this.bmp_width = spritebmp.getWidth(); 
     this.bmp_height= spritebmp.getHeight(); 
} 
//update the position of the sprite 
public void update() { 
    x = x + xSpeed; 
    y = y + ySpeed; 
    wrapAround(); //Adjust motion of sprite. 
} 

public void draw(Canvas canvas) { 

    //Draw sprite image 
    canvas.drawBitmap(spritebmp, x , y, null); 
} 

public void wrapAround(){ 
    //Code to wrap around 
    if (x < 0) x = x + gameView.getWidth(); //increment x whilst not off screen 
    if (x >= gameView.getWidth()){ //if gone of the right sides of screen 
      x = x - gameView.getWidth(); //Reset x 
    } 
    if (y < 0) y = y + gameView.getHeight();//increment y whilst not off screen 
    if (y >= gameView.getHeight()){//if gone of the bottom of screen 
     y -= gameView.getHeight();//Reset y 
    } 
} 

} 

与往常一样，任何帮助，不胜感激。

谢谢

Answer 1

我不确定你的问题到底在哪里。有一个Random.nextInt(int max)方法，所以你可以做这样的事情

public Sprite(GameView gameView) { 
     this.gameView=gameView; 
     spritebmp = BitmapFactory.decodeResource(gameView.getResources(), 
       R.drawable.sprite_robot); 
     this.bmp_width = spritebmp.getWidth(); 
     this.bmp_height= spritebmp.getHeight(); 

     this.x = random.nextInt(gameView.getWidth()); 
     this.y = random.nextInt(gameView.getHeight()); 
} 

这是你正在寻找或你有在其他一些地方的烦恼是什么？