Question

我试图在这张照片中定位我的视图（只是点图案）但没有成功。有人可以帮我弄清楚我应该如何使用onLayout做到这一点？感谢。

@Override
protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
    final int count = getChildCount();
    int curWidth, curHeight, curLeft, curTop, maxHeight;

    //get the available size of child view
    int childLeft = this.getPaddingLeft();
    int childTop = this.getPaddingTop();
    int childRight = (int) getResources().getDimension(R.dimen.circle_width) - this.getPaddingRight();
    int childBottom = (int) getResources().getDimension(R.dimen.circle_width) - this.getPaddingBottom();
    int childWidth = childRight - childLeft;
    int childHeight = childBottom - childTop;

    maxHeight = 0;
    curLeft = childLeft;
    curTop = childTop;
    //walk through each child, and arrange it from left to right
    for (int i = 0; i < count; i++) {
        View child = getChildAt(i);
        if (child.getVisibility() != GONE) {
            //Get the maximum size of the child
            child.measure(MeasureSpec.makeMeasureSpec(childWidth, MeasureSpec.AT_MOST),
                    MeasureSpec.makeMeasureSpec(childHeight, MeasureSpec.AT_MOST));
            curWidth = child.getMeasuredWidth();
            curHeight = child.getMeasuredHeight();

            //wrap is reach to the end
            if (curLeft + curWidth >= childRight) {
                curLeft = childLeft;
                curTop += maxHeight;
                maxHeight = 0;
            }

            //do the layout
            child.layout(curLeft, curTop, curLeft + curWidth, curTop + curHeight);

            //store the max height
            if (maxHeight < curHeight)
                maxHeight = curHeight;
            curLeft += curWidth;
        }
    }
}

Answer 1

首先你不应该在onLayout里面这样做，它被多次调用，你可能不需要这个。为什么不在constructor内准备，或者只是在onDraw内绘制点，将比仅使用简单位图添加大量View更有效。可能会显示一些屏幕你有什么，应该有任何动画吗？

Answer 2

实际上，您可以轻松地在XML布局中构建它。在它最简单的表示中，它只是三个点视图，彼此垂直移位。定义具有垂直方向的线性布局，权重和= 3，布局三视图，权重= 1.然后使用布局边距相对于彼此移动每个视图。这种场景的完美布局是Contraint Layout，它更灵活。

这是一个很好的教程，可以整合自定义手势处理http://fieldguide.gizmodo.com/how-to-add-customized-gesture-controls-to-your-android-1705180921

我如何定位这样的观点？ onLayout

2 个答案: