ListView行在CustomAdapter中以编程方式设置左边距

Question

我有一个带有自定义适配器的ListView.

在适配器的getview中,我想将15 dip的左边距设置为某些行.基于某些条件.

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

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

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

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

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

但是,当我使用以下代码设置保证金时,它给出了 ClassCastException

01-17 18:19:35.467:E/AndroidRuntime(14165):java.lang.ClassCastException:android.widget.FrameLayout $ LayoutParams无法强制转换为android.widget.AbsListView $ LayoutParams

行布局

<?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>

我的getView方法中的示例

   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;

此代码运行但崩溃时

返回行;

请帮忙.谢谢 :)

Answer 1

ListView期望不支持边距的AbsListView.LayoutParams.尝试在LinearLayout对象而不是FrameLayout上设置边距.或者在FrameLayout上使用填充.