LayoutParams 类型转换异常：java.lang.ClassCastException: android.widget.FrameLayout$LayoutParams

最新推荐文章于 2023-11-13 17:24:53 发布
原创 最新推荐文章于 2023-11-13 17:24:53 发布 · 5.4k 阅读 · 0 ·
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#LayoutParams #ClassCastException #onLayout #cannot be cast to #ListView

本文介绍了解决Android开发中因LayoutParams类型不匹配导致的ClassCastException错误的方法。通过分析错误日志，可以快速定位并修正LayoutParams类型。

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错误日志1：
06-13 10:55:50.410: E/KVLog(1129): Error info:java.lang.ClassCastException: android.widget.LinearLayout$LayoutParams
06-13 10:55:50.423: E/KVLog(1129): Cause Result:java.lang.ClassCastException: android.widget.LinearLayout$LayoutParams
06-13 10:55:50.423: E/KVLog(1129): at android.widget.FrameLayout.onLayout(FrameLayout.java:324)

一般设置LayoutParams的时候会报错，是因为LayoutParams有很多种，引用错误就会报错，那么如何快速解决这个错误呢
通过观察发现只要在日志信息中看到 at android.widget.FrameLayout.onLayout,（一般在cause result的下一行）那么onlayout前面显示的那个layout就是你真正要用到的layout，替换掉原来已用的layout，立刻解决问题！！！
错误日志2：
02-27 11:11:03.952: E/AndroidRuntime(3168): java.lang.ClassCastException: android.widget.FrameLayout$LayoutParams cannot be cast to android.widget.AbsListView$LayoutParams
02-27 11:11:03.952: E/AndroidRuntime(3168): at android.widget.GridView.onMeasure(GridView.java:1028)
02-27 11:11:03.952: E/AndroidRuntime(3168): at android.view.View.measure(View.java:12761)

通过观察发现只要在日志信息中看到错误日志第一行的信息，那么第一行中cannot be cast to 后面的layoutparams就是你要的真正的layoutparams，比如这个 android.widget.FrameLayout$LayoutParams是错误的，而cannot be cast to后面的android.widget.AbsListView$LayoutParams是对的

今天写一个ListView，用的是自定义的布局，这个ListView的headerView也是自定义布局，运行报错：
java.lang.ClassCastException: android.widget.RelativeLayout$LayoutParams cannot be cast to android.widget.AbsListView$LayoutParams

解决方法：如果你要将一个view添加到另一个布局中，你必须设定该View的布局参数为其父类所使用的布局参数类型。即要在代码中动态改变某组件的高度，其布局参数类型应该是其父类所使用的布局参数类型。

参考我的代码，因为ListView的headerView的LayoutParams参数没有改为和ListView一致；
改为
ListView.LayoutParams LP=new ListView.LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT);
后正常显示。

为什么都是ViewGroup的LayoutParams，也会报cannot be cast to android.view.ViewGroup$MarginLayoutParams？
知道的越多，不知道的越多。
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java.lang.ClassCastException: android.view.ViewGroup$LayoutParams cannot be cast to android.widget.L
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