java.lang.ClassCastException: android.view.ViewGroup$LayoutParams cannot be cast to android.widget.RelativeLayout$LayoutParams

问题

I've just edited my XML, I've put slide menu code in my XML, but there is an error.

<?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>

Error in logcat:

  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)

回答1:

In your code you are importing import android.widget.RelativeLayout.LayoutParams; instead of android.view.ViewGroup.LayoutParams

so Delete import android.widget.RelativeLayout.LayoutParams;

and Add import android.view.ViewGroup.LayoutParams

回答2:

You should make the LayoutParams object of the parent layout. Example in the layout below to set height and width of the LinearLayout you have to make the LayoutParmas of RelativeLayout not LinearLayout itself.

  <?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

回答3:

just click Cnt+o for delete unwanted imports

回答4:

Use code below:

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

Do let me know if you face any error.

来源：https://stackoverflow.com/questions/19604891/java-lang-classcastexception-android-view-viewgrouplayoutparams-cannot-be-cast