我如何可以通过点击按钮，机器人随意改变按钮现在的位置

这给了我一个错误在这里，setX的（INT）没有定义，虽然它是按钮式。

It gives me an error here that setX(int) is not defined though it is button type.

public class TouchMe extends Activity implements View.OnClickListener {

    Button btn;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
            // TODO Auto-generated method stub
            super.onCreate(savedInstanceState);
            setContentView(R.layout.tuchme);

            btn = (Button) findViewById(R.id.btn);

            btn.setOnClickListener(this);

    }

    public void onClick(View v) {
            // TODO Auto-generated method stub
            switch (v.getId()) {
            case (R.id.btn): {
                    Random r = new Random();
                    int x = r.nextInt(480 - buttonWidth);
                    int y = r.nextInt(800 - buttonHeight);

                    btn.setX(x);   // give me error here that setX(int) is not defined      
                    btn.setY(y);   // is button type.

            }

            }

这给了我错误在这里，setX的（INT）没有被定义为按钮式。 请帮助我。

It gives me error here that setX(int) is not defined is button type. please help me.