Question

我在RelativeLayout中有3个LinerLayouts，每个LinerLayouts包含9个按钮。现在我想在触摸按钮的同时在按钮顶部绘制矩形框，并且矩形框应该滑动（移动）到每个按钮手指的移动方式。知道如何做到这一点..提前谢谢。

Answer 1

protected void onDraw(Canvas canvas) {
    super.onDraw(canvas);

    canvas.drawRect(mRect, new Paint());
}

private Rect mRect = new Rect();

private static final int WIDTH = 100;
private static final int HEIGHT = 100;

private void setRectPosition(int x, int y) {
    mRect.set(x, y, WIDTH, HEIGHT);
    invalidate();
}

@Override
public boolean onTouchEvent(MotionEvent event) {
    float x = event.getX();
    float y = event.getY();
    setRectPosition((int)x, (int)y);
    return super.onTouchEvent(event);
}

我认为这可行。

如何使用画布在按钮上绘制矩形

1 个答案: