ListView row set Left Margin programmatically in CustomAdapter

Question

I have a ListView with its Custom Adapter.

in adapter's getview i want to set margin left of 15 dip to some rows. based on certain conditions.

  -----------------------------
 |  Row 1 (margin 15dip)       |
  -----------------------------

  -----------------------------
 |  Row 2 (margin 15dip)       |
  -----------------------------

       -----------------------------
      |  Row 2.1 (margin 30dip)     |
       -----------------------------

             -----------------------------
            |  Row 2.1.1 (margin 45dip)   |
             -----------------------------

  -----------------------------
 |  Row 3 (margin 15dip)       |
  -----------------------------

But when i set margin using the following code it gives ClassCastException

01-17 18:19:35.467: E/AndroidRuntime(14165): java.lang.ClassCastException: android.widget.FrameLayout$LayoutParams cannot be cast to android.widget.AbsListView$LayoutParams

Row layout

<?xml version="1.0" encoding="utf-8"?>
 <FrameLayout
 xmlns:android="http://schemas.android.com/apk/res/android"
 android:id="@+id/parentframeLayout"
 android:layout_width="match_parent"
 android:layout_height="wrap_content"
 android:layout_marginLeft="10dip"
 android:layout_marginRight="10dip" >

<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="40dip"
    android:background="@color/alphaBlueMariner"
    android:gravity="center_vertical"
    android:orientation="horizontal"
    android:paddingLeft="10dip" >

    <ImageView
        android:id="@+id/offlineImageView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:gravity="center_vertical"
        android:src="@drawable/ic_object_offline" />

    <ImageView
        android:id="@+id/parentImageView"
        android:layout_width="@dimen/small_indicator_icon_square"
        android:layout_height="@dimen/small_indicator_icon_square"
        android:layout_marginLeft="5dip"
        android:src="@drawable/ic_arrow_right" />

    <TextView
        android:id="@+id/tvParentName"
        style="@style/TextViewMedStyleShadowBlack"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:paddingLeft="20dip" />
</LinearLayout>

</FrameLayout>

sample in my getView method

   Log.i("LayoutParams","1");
            // setting left margin
            FrameLayout.LayoutParams params = new FrameLayout.LayoutParams(
                    FrameLayout.LayoutParams.MATCH_PARENT,      
                    FrameLayout.LayoutParams.WRAP_CONTENT
                    );

            Resources r = context.getResources();

            int px = (int) TypedValue.applyDimension(
                    TypedValue.COMPLEX_UNIT_DIP,
                    15, 
                    r.getDisplayMetrics()
                    );

            if(requirementModel.getParentId() == 0)
            {

                params.setMargins(px, 0, 0, 0);

                parentFrameLayout.setLayoutParams(params);

            }
            else
            {

                params.setMargins(px+px, 0, 0, 0);

                parentFrameLayout.setLayoutParams(params);

            }
            parentFrameLayout.requestLayout();

}

return row;

this code runs but crashes when

return row;

Please help. thanks :)

Answer 1

ListView expects AbsListView.LayoutParams that does not support margins. Try to set margins on the LinearLayout object instead of the FrameLayout. Or use paddings on the FrameLayout.