Java – Unable to set the Linearlayout parameter in Framelayout

I have a linear layout in Framelayout. What I’d like to do is programmatically add some margins to the linear layout based on the screen size.

<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:fillViewport="true"
    android:scrollbars="none">
    <FrameLayout 
        android:id="@+id/activity_main"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        tools:context="com.example.aba.webcampstest.MainActivity"
        android:orientation="vertical">

<ImageView
            android:id="@+id/headerImageView"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:adjustViewBounds="true"
            android:layout_marginTop="0dp"
            android:scaleType="centerCrop"/>

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

oher stuffs
       </LinearLayout>
    </FrameLayout >
</ScrollView>

My Activity onCreate method contains

LinearLayout containerLayout = (LinearLayout) findViewById(R.id.mainContainerLayout);
int marginTopBottom = dpToPx((int)((dpHeight*8)/100),(int)density); 8%
int marginLeftRight = dpToPx((int)((dpWidth*6)/100),(int)density); 6%

LinearLayout.LayoutParams languageContainerLayoutParams = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.MATCH_PARENT);
languageContainerLayoutParams.setMargins(marginLeftRight,marginTopBottom,marginLeftRight,marginTopBottom);
containerLayout.setLayoutParams(languageContainerLayoutParams);

An error
occurred while starting the Activity

E/AndroidRuntime:
FATAL EXCEPTION: main
Process: com.example.aba.webcampstest, PID: 11723
java.lang.ClassCastException: android.widget.LinearLayout$LayoutParams cannot be cast to
android.widget.FrameLayout$LayoutParams
at android.widget.FrameLayout.onMeasure(FrameLayout.java:311)
at android.view.View.measure(View.java:17495)
at android.widget.ScrollView.measureChildWithMargins(ScrollView.java:1779)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
at android.widget.ScrollView.onMeasure(ScrollView.java:476)
at android.view.View.measure(View.java:17495)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5363)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
at android.view.View.measure(View.java:17495)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5363)
at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1410)
at android.widget.LinearLayout.measureVertical(LinearLayout.java:695)
at android.widget.LinearLayout.onMeasure(LinearLayout.java:588)
at android.view.View.measure(View.java:17495)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5363)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2548)
at android.view.View.measure(View.java:17495)
at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:2285)
at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1396)
at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1595)
at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1254)
at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:6637)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:814)
at android.view.Choreographer.doCallbacks(Choreographer.java:614)
at android.view.Choreographer.doFrame(Choreographer.java:584)
at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:800)
at android.os.Handler.handleCallback(Handler.java:733)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:146)
at android.app.ActivityThread.main(ActivityThread.java:5602)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1283)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1099)
at dalvik.system.NativeStart.main(Native Method)

What could be the problem?

setLayoutParams description :

Set the layout parameters associated with this view. These supply parameters to the parent of this view specifying how it should be arranged. There are many subclasses of ViewGroup.LayoutParams, and these correspond to the different subclasses of ViewGroup that are responsible for arranging their children.

The LayoutParams

type should be relative to your LinearLayout container, in this case FrameLayout.LayoutParams:

FrameLayout.LayoutParams languageContainerLayoutParams = new FrameLayout.LayoutParams(FrameLayout.LayoutParams.MATCH_PARENT, FrameLayout.LayoutParams.MATCH_ PARENT);
languageContainerLayoutParams.setMargins(marginLeftRight,marginTopBottom,marginLeftRight,marginTopBottom);
containerLayout.setLayoutParams(languageContainerLayoutParams);