java.lang.ClassCastException: android.view.ViewGroup$LayoutParams 不能转换为 android.widget.RelativeLayout$LayoutParams答案

【问题标题】：java.lang.ClassCastException: android.view.ViewGroup$LayoutParams cannot be cast to android.widget.RelativeLayout$LayoutParamsjava.lang.ClassCastException: android.view.ViewGroup$LayoutParams 不能转换为 android.widget.RelativeLayout$LayoutParams
【发布时间】：2013-11-05 11:02:32
【问题描述】：

我刚刚编辑了我的 XML，我在我的 XML 中放入了幻灯片菜单代码，但是有一个错误。

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#ffffff" >

    <ListView 
        android:id="@+id/menu_content_menulist"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:padding="8dp"

        android:cacheColorHint="@android:color/transparent" 
        android:divider="@null"
        android:listSelector="@null"/>      
    <RelativeLayout 
        android:layout_width="match_parent"
        android:layout_height="match_parent">
        <com.mozaik.tangsel.side_menu_scroll.ScrollerLinearLayout       
            android:id="@+id/menu_content_side_slide_layout"
            android:layout_width="match_parent"
            android:layout_height="match_parent"        
            android:orientation="verti_

    <LinearLayout
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:id="@+id/content_statis"        
        android:orientation="vertical"
        android:background="@drawable/bg_app"
         >

        <include layout="@layout/layout_action_bar" />
    <ScrollView
        android:id="@+id/SV"
        android:layout_width="fill_parent"
        android:layout_height="match_parent"
        android:fillViewport="true" 
        >

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:orientation="vertical" >

            <LinearLayout
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:layout_margin="4dp"
                android:background="@drawable/inbox_interface"
                android:orientation="vertical" >

                <LinearLayout
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:orientation="vertical" >

                    <ImageView
                        android:id="@+id/ImageMozaikTangsel"
                        android:layout_width="fill_parent"
                        android:layout_height="wrap_content"
                        android:layout_margin="10dip" />

                </LinearLayout>

                <LinearLayout
                    android:id="@+id/tabMozaikTangselLayout"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:orientation="vertical" >
                </LinearLayout>

            </LinearLayout>

        </LinearLayout>

</ScrollView>

   </LinearLayout>
</com.mozaik.tangsel.side_menu_scroll.ScrollerLinearLayout>
</RelativeLayout>
</RelativeLayout>

logcat 中的错误：

  10-26 15:53:32.126: E/AndroidRuntime(10869): FATAL EXCEPTION: main
10-26 15:53:32.126: E/AndroidRuntime(10869): java.lang.ClassCastException: android.view.ViewGroup$LayoutParams cannot be cast to android.widget.RelativeLayout$LayoutParams
10-26 15:53:32.126: E/AndroidRuntime(10869):    at android.widget.RelativeLayout$DependencyGraph.findRoots(RelativeLayout.java:1352)
10-26 15:53:32.126: E/AndroidRuntime(10869):    at android.widget.RelativeLayout$DependencyGraph.getSortedViews(RelativeLayout.java:1299)
10-26 15:53:32.126: E/AndroidRuntime(10869):    at android.widget.RelativeLayout.sortChildren(RelativeLayout.java:316)
10-26 15:53:32.126: E/AndroidRuntime(10869):    at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:337)
10-26 15:53:32.126: E/AndroidRuntime(10869):    at android.view.View.measure(View.java:15193)
10-26 15:53:32.126: E/AndroidRuntime(10869):    at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4816)
10-26 15:53:32.126: E/AndroidRuntime(10869):    at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
10-26 15:53:32.126: E/AndroidRuntime(10869):    at android.view.View.measure(View.java:15193)
10-26 15:53:32.126: E/AndroidRuntime(10869):    at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4816)
10-26 15:53:32.126: E/AndroidRuntime(10869):    at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1390)
10-26 15:53:32.126: E/AndroidRuntime(10869):    at android.widget.LinearLayout.measureVertical(LinearLayout.java:681)
10-26 15:53:32.126: E/AndroidRuntime(10869):    at android.widget.LinearLayout.onMeasure(LinearLayout.java:574)
10-26 15:53:32.126: E/AndroidRuntime(10869):    at android.view.View.measure(View.java:15193)
10-26 15:53:32.126: E/AndroidRuntime(10869):    at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4816)
10-26 15:53:32.126: E/AndroidRuntime(10869):    at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
10-26 15:53:32.126: E/AndroidRuntime(10869):    at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2217)
10-26 15:53:32.126: E/AndroidRuntime(10869):    at android.view.View.measure(View.java:15193)
10-26 15:53:32.126: E/AndroidRuntime(10869):    at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:1850)
10-26 15:53:32.126: E/AndroidRuntime(10869):    at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1102)
10-26 15:53:32.126: E/AndroidRuntime(10869):    at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1275)
10-26 15:53:32.126: E/AndroidRuntime(10869):    at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1000)
10-26 15:53:32.126: E/AndroidRuntime(10869):    at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:4216)
10-26 15:53:32.126: E/AndroidRuntime(10869):    at android.view.Choreographer$CallbackRecord.run(Choreographer.java:725)
10-26 15:53:32.126: E/AndroidRuntime(10869):    at android.view.Choreographer.doCallbacks(Choreographer.java:555)
10-26 15:53:32.126: E/AndroidRuntime(10869):    at android.view.Choreographer.doFrame(Choreographer.java:525)
10-26 15:53:32.126: E/AndroidRuntime(10869):    at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:711)
10-26 15:53:32.126: E/AndroidRuntime(10869):    at android.os.Handler.handleCallback(Handler.java:615)
10-26 15:53:32.126: E/AndroidRuntime(10869):    at android.os.Handler.dispatchMessage(Handler.java:92)
10-26 15:53:32.126: E/AndroidRuntime(10869):    at android.os.Looper.loop(Looper.java:137)
10-26 15:53:32.126: E/AndroidRuntime(10869):    at android.app.ActivityThread.main(ActivityThread.java:4794)
10-26 15:53:32.126: E/AndroidRuntime(10869):    at java.lang.reflect.Method.invokeNative(Native Method)
10-26 15:53:32.126: E/AndroidRuntime(10869):    at java.lang.reflect.Method.invoke(Method.java:511)
10-26 15:53:32.126: E/AndroidRuntime(10869):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:789)
10-26 15:53:32.126: E/AndroidRuntime(10869):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:556)
10-26 15:53:32.126: E/AndroidRuntime(10869):    at dalvik.system.NativeStart.main(Native Method)

【问题讨论】：

看起来您正在修改代码中的LayoutParams。单独的 XML 布局不会导致这种情况。因此，请在问题中包含相关代码。
确保导入正确的 LayoutParams。
@kalyan pvs 的回答解决了我的错误，也谢谢你:)
@bukanamay 好，那你必须接受他的回答，伙计
在这里需要帮助stackoverflow.com/questions/30951608/…

标签： java android android-layout android-relativelayout layoutparams

【解决方案1】：

在您的代码中，您正在导入 import android.widget.RelativeLayout.LayoutParams; 而不是 android.view.ViewGroup.LayoutParams

所以删除import android.widget.RelativeLayout.LayoutParams;

并添加import android.view.ViewGroup.LayoutParams

【讨论】：

为什么 ViewGroup.LayoutParams 会有所作为？
@IgorGanapolsky 因为 LayoutParams 是特定类的内部类..RelativeLayout 扩展 ViewGroup 所以你可以进行类型转换，但 RelativeLayout.LayoutParams 不能扩展 ViewGroup.LayoutParams 所以它会抛出 ClassCastException

【解决方案2】：

只需单击 Cnt+o 即可删除不需要的导入

【讨论】：

【解决方案3】：

您应该创建父布局的 LayoutParams 对象。下面的布局示例要设置 LinearLayout 的高度和宽度，您必须使 RelativeLayout 的 LayoutParmas 不是 LinearLayout 本身。

  <?xml version="1.0" encoding="utf-8"?>
    <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".newsblog.NewsDetailsActivity"
    >

      <LinearLayout
         android:layout_width="match_parent"
         android:layout_height="wrap_content"/>


 </RelativeLayout>

Java：

//IN ACTIVITY
RelativeLayout.LayoutParams params=new RelativeLayout.LayoutParams(30,30); //Parent Params
linearLayout.setLayoutParmas(params); //Child Layout


//If you want to set the params of the Relative Layout above. It seems it doesn't have any parent but it has a parent created by android framework which is a frame layout. So 
FrameLayout.LayoutParmas params=new FrameLayout.LayoutParmas(30, 30);//FrameLayout is a parentcreated by anroid frame work
relativeLayout.setLayoutParmas(params);  ////Here Relative layout is child

【讨论】：

这是一个很好的答案。

【解决方案4】：

使用下面的代码：

imageView.setLayoutParams(
  new android.widget.RelativeLayout.LayoutParams(
    ViewPager.LayoutParams.MATCH_PARENT,
    ViewPager.LayoutParams.MATCH_PARENT));

如果您遇到任何错误，请告诉我。

【讨论】：