在android中移动圈子

我有一个任务。 它是绘制一些（多个）圆圈在屏幕上移动。 他们必须在点击它们后开始移动。 我只有一个圆圈的代码。 告诉我如何执行此任务的方式，例如，5个圆圈。 提前致谢！

public class MainActivity extends Activity { @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(new MyView(this)); } class MyView extends View { //public Paint c; public Paint p; private static final int RADIUS = 46; private int centerX; private int centerY; private int speedX = 50; private int speedY = 40; //private Paint paint; // Создай его где-нибудь там в конструкторе public MyView(Context context) { super(context); p = new Paint(); p.setColor(Color.GREEN); } @Override protected void onSizeChanged(int w, int h, int oldW, int oldH) { centerX = w / 2; centerY = h / 2; } protected void onDraw(Canvas c) { int w = getWidth(); int h = getHeight(); centerX += speedX; centerY += speedY; int rightLimit = w - RADIUS; int bottomLimit = h - RADIUS; if (centerX >= rightLimit) { centerX = rightLimit; speedX *= -1; } if (centerX = bottomLimit) { centerY = bottomLimit; speedY *= -1; } if (centerY <= RADIUS) { centerY = RADIUS; speedY *= -1; } c.drawCircle(centerX, centerY, RADIUS, p); postInvalidateDelayed(200); } } } 

Answer 1

你必须改变这个部分：

  private int centerX; private int centerY; private int speedX = 50; private int speedY = 40; 

并将其转换为

 class Circle { private int centerX; private int centerY; private int speedX = 50; private int speedY = 40; // add constructor here and other things }; 

然后制作你的圈子的集合： ArrayList circles ，然后代替

 centerX += speedX; centerY += speedY; int rightLimit = w - RADIUS; int bottomLimit = h - RADIUS; if (centerX >= rightLimit) { centerX = rightLimit; speedX *= -1; } if (centerX <= RADIUS) { centerX = RADIUS; speedX *= -1; } if (centerY >= bottomLimit) { centerY = bottomLimit; speedY *= -1; } if (centerY <= RADIUS) { centerY = RADIUS; speedY *= -1; } 

你必须为每个圈子做这件事，比如

 for( i=0; i 

}

Answer 2

您需要使用不同的centerx，centerY，Radius和p调用绘制圆圈5次