ListView中删掉某个item时出现整个ListView都看不见，但是数据源有改变

<ListView         android:id="@+id/lv_collect_list"         android:layout_width="match_parent"         android:layout_height="match_parent"         android:divider="@null" />

adapter里的布局是这样的：

<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="https://schemas.android.com/apk/res/android"     android:id="@+id/rl_adapter_collect"     android:layout_width="match_parent"     android:layout_height="match_parent"     android:layout_margin="5dp"     android:orientation="vertical"     android:padding="5dp" >      <ImageView         android:id="@+id/iv_collect_image"         android:layout_width="90dp"         android:layout_height="90dp"         android:background="@drawable/default_image_185_140"         android:contentDescription="@string/No"         android:scaleType="fitXY" />      <TextView         android:id="@+id/tv_collect_desp"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:layout_marginLeft="8dp"         android:layout_toRightOf="@+id/iv_collect_image"         android:ellipsize="end"         android:lines="2"         android:singleLine="false"         android:text="eqeqeqeq大脚地哦啊大加大打击哦啊的骄傲就SADA懂啊激动啊dadadadada" />      <TextView         android:id="@+id/tv_collect_price2"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:layout_alignBottom="@+id/iv_collect_image"         android:layout_marginLeft="8dp"         android:layout_toRightOf="@+id/iv_collect_image"         android:text="商城价:" />      <TextView         android:id="@+id/tv_collect_price"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:layout_alignBaseline="@+id/tv_collect_price2"         android:layout_alignBottom="@+id/tv_collect_price2"         android:layout_toRightOf="@+id/tv_collect_price2"         android:text="58.0"         android:textColor="@color/red"         android:textSize="16sp" />      <View         android:id="@+id/view1"         android:layout_width="match_parent"         android:layout_height="1dp"         android:layout_alignParentLeft="true"         android:layout_below="@+id/iv_collect_image"         android:layout_marginTop="5dp"         android:background="@android:color/darker_gray" />      <Button         android:id="@+id/btn_collect_delete"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:layout_above="@+id/view1"         android:layout_alignParentRight="true"         android:background="@drawable/red_change"         android:padding="5dp"         android:textColor="@android:color/white"         android:text="删除" />  </RelativeLayout>

后来我该变了ListView的布局将

 android:layout_height="match_parent"

改为

android:layout_height="wrap_content" 

结果是整个ListView点进去查看都已经报错了，跟上面的情况错误一样，”类转换异常“，

实在纠结，后面我再看了下adapter的View，重新改成如下：

<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="https://schemas.android.com/apk/res/android"     android:layout_width="match_parent"     android:layout_height="match_parent"     android:layout_margin="5dp"     android:orientation="vertical"     android:padding="5dp" >      <RelativeLayout         android:id="@+id/rl_adapter_collect"         android:layout_width="match_parent"         android:layout_height="wrap_content" >          <ImageView             android:id="@+id/iv_collect_image"             android:layout_width="90dp"             android:layout_height="90dp"             android:background="@drawable/default_image_185_140"             android:contentDescription="@string/No"             android:scaleType="fitXY" />          <TextView             android:id="@+id/tv_collect_desp"             android:layout_width="wrap_content"             android:layout_height="wrap_content"             android:layout_marginLeft="8dp"             android:layout_toRightOf="@+id/iv_collect_image"             android:ellipsize="end"             android:lines="2"             android:singleLine="false"             android:text="商品名称" />          <TextView             android:id="@+id/tv_collect_price2"             android:layout_width="wrap_content"             android:layout_height="wrap_content"             android:layout_alignBottom="@+id/iv_collect_image"             android:layout_marginLeft="8dp"             android:layout_toRightOf="@+id/iv_collect_image"             android:text="商城价:" />          <TextView             android:id="@+id/tv_collect_price"             android:layout_width="wrap_content"             android:layout_height="wrap_content"             android:layout_alignBaseline="@+id/tv_collect_price2"             android:layout_alignBottom="@+id/tv_collect_price2"             android:layout_toRightOf="@+id/tv_collect_price2"             android:text="58.0"             android:textColor="@color/red"             android:textSize="16sp" />          <View             android:id="@+id/view1"             android:layout_width="match_parent"             android:layout_height="1dp"             android:layout_alignParentLeft="true"             android:layout_below="@+id/iv_collect_image"             android:layout_marginTop="5dp"             android:background="@android:color/darker_gray" />          <Button             android:id="@+id/btn_collect_delete"             android:layout_width="wrap_content"             android:layout_height="wrap_content"             android:layout_above="@+id/view1"             android:layout_alignParentRight="true"             android:background="@drawable/red_change"             android:padding="5dp"             android:text="删除"             android:textColor="@android:color/white" />     </RelativeLayout>  </LinearLayout>

终于可以了，但是我还是不太清楚原因，求大神指教！！！