Dialog嵌套listview最后一行被遮盖问题

最近项目中实现了一个功能 Dialog中嵌套ListView 顺利完成后 发现最后一行数据有被遮盖的问题 
先上代码

Drawable drawable = getResources().getDrawable(R.drawable.transparent);;

LayoutInflater inflater = LayoutInflater.from(this);
View view = inflater.inflate(R.layout.choose_list,null);
ListView listView = (ListView) view.findViewById(R.id.id_listview);
listView.setSelector(drawable);
listView.setAdapter(mInsAdapter);

builder = new AlertDialog.Builder(this, R.style.Theme_AppCompat_Light_Dialog_Alert_Self);
builder.setTitle("请选仪器");
//设置加载的listview
builder.setView(view);
builder.setPositiveButton("确定", new DialogOnClick());
builder.setNegativeButton("取消", new DialogOnClick());
builder.create().show();

布局
choose_list
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<ListView
android:id="@+id/id_listview"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:cacheColorHint="@color/transparent">
</ListView>

</LinearLayout>

listview item 布局
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:padding="@dimen/dp_10">

<LinearLayout
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="40dp"
android:descendantFocusability="blocksDescendants" >

<TextView
android:gravity="center_vertical"
android:layout_weight="1"
android:id="@+id/id_ins_name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="仪器名称"
android:textColor="@color/black"
android:textSize="12sp"/>
<TextView
android:gravity="center_vertical"
android:layout_weight="1"
android:id="@+id/id_ins_type"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="仪器类型"
android:textColor="@color/black"
android:textSize="12sp"/>
<CheckBox
android:id="@+id/id_ins_check"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:clickable="true"
android:focusable="true"
android:theme="@style/cb_style"/>
</LinearLayout>

</LinearLayout>

注：标红的之前用到是wrap_content  改成固定高度即可