public class DrawView extends View {
public DrawView(Context context) {
super(context);
}
}
//画笔
private Paint paint;
//当前X坐标
private float currentX;
//当前Y坐标
private float currentY;
public DrawView(Context context) {
super(context);
this.paint = new Paint();
this.currentX = 100;
this.currentY = 100;
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
//设置画笔颜色
paint.setColor(Color.RED);
//绘制圆形，中心位置（currentX, currentY）,半径10
canvas.drawCircle(currentX, currentY, 10, paint);
}
@Override public boolean onTouchEvent(MotionEvent event) { //获取点击事件的坐标x，y currentX = event.getX(); currentY = event.getY(); //重绘控件 invalidate(); return true; }
RelativeLayout layout = (RelativeLayout) findViewById(R.id.layout); DrawView draw = new DrawView(this); layout.addView(draw);
原文：http://www.cnblogs.com/superdo/p/5272554.html