Android java.lang.ClassCastException

Question

I am loading a webview with a close button and a slide button. When I clic

main.xml

<RelativeLayout  xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical"
    android:background="#FFFFFF" 
    android:layout_marginRight="25dip"
    android:layout_marginTop="25dip"
    android:layout_marginLeft="25dip"
    android:layout_marginBottom="25dip" >
<WebView
    android:id="@+id/webac_larger"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent">
</WebView>

<ImageView android:id="@+id/close_btn"         
    android:layout_alignParentTop="true"         
    android:layout_alignParentRight="true"         
    android:layout_width="wrap_content"         
    android:layout_height="wrap_content"
    android:src="@drawable/close_button"
    android:layout_marginTop="-3dip"
    android:layout_marginRight="0dip"
    />  

<ImageButton 
    android:id="@+id/slidebutton"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content" 
    android:layout_toLeftOf="@+id/close_btn"
    android:src="@drawable/arrowleft" />

I want to resize webview on click of a button.

final ImageButton button1 = (ImageButton) findViewById(R.id.slidebutton);
        button1.setOnClickListener(new OnClickListener() {
          public void onClick(View v) {
            Log.d("MultiWeb", "I have clicked the button");
            RelativeLayout params = ((RelativeLayout )button1.getParent());
             params.setLayoutParams(new RelativeLayout.LayoutParams(100, 100));
          }
        });

I am getting this error. I am using relatice layout and why error says something about frame layout ?

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

@user113215, why don't you make that an answer, so sam can accept it? :) — Chad Schultz
– Chad Schultz, Commented Sep 21, 2012 at 16:42

quietmint · Accepted Answer · 2012-09-21 18:03:12Z

1

As stated in the Android Layouts API Guide, each type of ViewGroup has its own LayoutParams class that define the size and position for child Views.

Instead of creating a brand new instance of one of the LayoutParams classes and risking a ClassCastException, you can call getLayoutParams() on your view to get the current parameter object, modify it as you wish, and call setLayoutParams() to apply the updated parameters.

answered Sep 21, 2012 at 18:03

quietmint

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