Question

所以我有一个可扩展视图的网格视图（用户点击它们，它们可以动画扩展）。问题是，当我点击第二列时，我的gridview只会增加行高。在第一张图片中，您可以看到我按下列表中的第一个项目并进行了扩展，但gridview没有更新其行的高度。在第二张图片中，我点击了第二列中的第二个项目，并且网格视图按预期展开。看来gridview只是根据第二列进行测量。如何将它与第一列进行比较并选择较大的一列？感谢。

编辑：这甚至发生在简单的布局上。行宽始终是第二列的高度，即使该行中的第一列更高。

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Answer 1

我遇到了同样的问题，为了解决这个问题，我不得不扩展GridView并使用一些脏黑客......

public class AutoGridView extends GridView {
    public AutoGridView(Context context, AttributeSet attrs, int defStyle){
        super(context, attrs, defStyle);
    }

    public AutoGridView(Context context, AttributeSet attrs){
        super(context, attrs);
    }

    public AutoGridView(Context context){
        super(context);
    }

    @Override
    protected void layoutChildren(){
    /*This method is called during onLayout. I let the superclass make the hard
    part, then I change the top and bottom of visible items according to their
    actual height and that of their siblings*/

        final int childrenCount = getChildCount();
        if(childrenCount <= 0){ //nothing to do, just call the super implementation
            super.layoutChildren();
            return;
        }

        /*GridView uses the bottom of the last child to decide if and how to scroll.
        UGLY HACK: ensure the last child bottom is equal to the lowest one.
        Since super implementation might invalidate layout I must be sure the old
        value is restored after the call*/
        View v = getChildAt(childrenCount - 1);
        int oldBottom = v.getBottom();
        super.layoutChildren();
        v.setBottom(oldBottom);

        for(int i = 0; i < getNumColumns(); ++i){
            int top = getListPaddingTop();
            for(int j = i; j < childrenCount; j += getNumColumns()){
                v = getChildAt(j);
                /*after setTop v.getHeight() returns a different value,
                that's why I'm saving it...*/
                int viewHeight = v.getHeight();
                v.setTop(top);
                top += viewHeight;
                v.setBottom(top);
                top += getVerticalSpacing();
            }
        }
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec){
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);

        final int childrenCount = getChildCount();
        if(getAdapter() != null && childrenCount > 0){
            measureChildren(widthMeasureSpec, heightMeasureSpec);
            int width = getSize(widthMeasureSpec);
            int heightSize = getSize(heightMeasureSpec);
            int heightMode = getMode(heightMeasureSpec);

            int maxHeight = heightSize;
            for(int i = 0; i < getNumColumns(); ++i){
                int columnHeight = 0;
                for(int j = i; j < childrenCount; j += getNumColumns())
                    columnHeight += getChildAt(j).getMeasuredHeight() + getVerticalSpacing();
                maxHeight = Math.max(maxHeight, columnHeight);
            }

            getChildAt(childrenCount-1).setBottom(maxHeight); // for the scrolling hack

            int height = heightSize;
            if(heightMode == UNSPECIFIED)
                height = maxHeight;
            else if(heightMode == AT_MOST)
                height = Math.min(maxHeight, heightSize);

            setMeasuredDimension(width, height);
        }
    }
}

我知道，可能对你来说这个答案为时已晚，但我希望它可以帮助那些像我一样绊倒你问题的人^^

Android GridView行高是最后一列的行高

1 个答案: