NestedScrollView ViewGroup$LayoutParams cannot be cast to android.widget.AbsListView$LayoutParams

最新推荐文章于 2020-12-20 03:22:43 发布

老靳

最新推荐文章于 2020-12-20 03:22:43 发布

阅读量523

点赞数

CC 4.0 BY-SA版权

文章标签： NestedScrollView GridView ClassCastException android

本文链接：https://blog.youkuaiyun.com/JIN178378764/article/details/79666338

本文解决了一个在使用AppBarLayout+CollapsingToolbarLayout+Toolbar+NestedScrollView实现折叠工具栏时遇到的问题，具体表现为类型转换异常。该问题仅在Android 4.4设备上出现，通过调整item布局中的容器并动态修改其高度解决了此异常。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

今天在用AppBarLayout+CollapsingToolbarLayout+Toolbar+NestedScrollView 实现折叠工具栏的时候遇到个问题，做下总结，错误信息如下：

java.lang.ClassCastException:

android.view.ViewGroup$LayoutParams cannot be cast to android.widget.AbsListView$LayoutParams

at android.widget.GridView.onMeasure(GridView.java:1047)

at android.view.View.measure(View.java:16896)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5413)
at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1616)
at android.widget.LinearLayout.measureVertical(LinearLayout.java:729)
at android.widget.LinearLayout.onMeasure(LinearLayout.java:601)
at android.view.View.measure(View.java:16896)
at android.support.v4.widget.NestedScrollView.measureChildWithMargins(NestedScrollView.java:1415)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:332)
at android.support.v4.widget.NestedScrollView.onMeasure(NestedScrollView.java:480)
at android.view.View.measure(View.java:16896)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5413)
at android.support.design.widget.CoordinatorLayout.onMeasureChild(CoordinatorLayout.java:668)
at android.support.design.widget.CoordinatorLayout.onMeasure(CoordinatorLayout.java:735)
at android.view.View.measure(View.java:16896)
...................................

错误内容很明显，类型转换异常。

之前在5.0以上手机运行都正常，今天换了个4.4的设备就报上面的错误，错误明显发生在at android.widget.GridView.onMeasure(GridView.java:1047)这个一行，和GridView 有关，后来想起了adapter 的getView中有动态设置布局的LayoutParams地方，应该问题就出在这里。

代码如下：

   @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        try {
            ViewHolder mHolder = null;

            if (convertView == null) {
                convertView = mInflater.inflate(R.layout.mine_menu_service_item_view, null);
                mHolder = new ViewHolder();
                mHolder.ivPluginPic = (ImageView) convertView.findViewById(R.id.iv_plugin_pic);
                mHolder.tvPluginName = (TextView) convertView.findViewById(R.id.tv_plugin_name);
                convertView.setTag(mHolder);
            } else {
                mHolder = (ViewHolder) convertView.getTag();
            }
             //item的宽度和高度
            ViewGroup.LayoutParams params=new ViewGroup.LayoutParams(mPluginViewWidth,mPluginViewHeight);
            convertView.setLayoutParams(params);

去掉上面这段标红的代码问题就消失了，最终在item的布局中添加了一层容器，动态修改这个容的高度，问题解决了。。。