如何在searchView和下拉列表之间添加空格（egheight = 20dp）？

Question

在我的片段（不在ToolBar中）我有SearchView组件。 这里片段在XML布局：

<?xml version="1.0" encoding="utf-8"?> 
<android.support.constraint.ConstraintLayout 
    xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:app="http://schemas.android.com/apk/res-auto" 
    xmlns:tools="http://schemas.android.com/tools" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent"> 

    <android.support.v7.widget.SearchView 
     android:id="@+id/searchView" 
     style="@style/Widget.AppCompat.SearchView.ActionBar" 
     android:layout_width="0dp" 
     android:layout_height="30dp" 
     android:background="@drawable/search_view_bg" 
     app:layout_constraintLeft_toLeftOf="parent" 
     app:layout_constraintRight_toRightOf="parent" 
     app:layout_constraintTop_toTopOf="parent" 
     app:searchHintIcon="@null" />  
</android.support.constraint.ConstraintLayout> 

这里我的下拉的项目布局的xml：

<?xml version="1.0" encoding="utf-8"?> 
<android.support.constraint.ConstraintLayout 
    xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:app="http://schemas.android.com/apk/res-auto" 
    xmlns:tools="http://schemas.android.com/tools" 
    android:layout_width="match_parent" 
    android:layout_height="wrap_content" 
    android:minHeight="@dimen/standard_min_height_container"> 

    <ImageView 
     android:id="@+id/catalogImageView" 
     android:layout_width="28dp" 
     android:layout_height="28dp" 
     android:src="@drawable/suggestion_icon" 
     app:layout_constraintBottom_toBottomOf="parent" 
     app:layout_constraintLeft_toLeftOf="parent" 
     app:layout_constraintTop_toTopOf="parent" 
     app:layout_goneMarginStart="@dimen/standard_margin" /> 

    <TextView 
     android:id="@+id/catalogNameTextView" 
     android:layout_width="0dp" 
     android:layout_height="wrap_content" 
     android:layout_marginEnd="20dp" 
     android:layout_marginLeft="20dp" 
     android:layout_marginStart="20dp" 
     android:text="Test text View Test text " 
     android:textColor="@android:color/black" 
     android:textSize="15sp" 
     app:layout_constraintBottom_toBottomOf="@+id/catalogImageView" 
     app:layout_constraintLeft_toRightOf="@+id/catalogImageView" 
     app:layout_constraintRight_toRightOf="parent" 
     app:layout_constraintTop_toTopOf="@+id/catalogImageView" /> 

    <View 
     android:id="@+id/textView2" 
     android:layout_width="0dp" 
     android:layout_height="1dp" 
     android:background="@color/divider_color" 
     app:layout_constraintBottom_toBottomOf="parent" 
     app:layout_constraintLeft_toLeftOf="@+id/catalogImageView" 
     app:layout_constraintRight_toRightOf="@+id/catalogNameTextView" />  
</android.support.constraint.ConstraintLayout> 

这里的Java代码在我的片段：

searchView = view.findViewById(R.id.searchView); 
SearchManager sMng = context.getSystemService(Context.SEARCH_SERVICE);  
searchView.setSearchableInfo(sMng.getSearchableInfo(getComponentName())); 
searchView.setSuggestionsAdapter(new SearchCatalogSuggestionsAdapter(ctx); 

而且这里的结果是：

但我需要在searchView和下拉列表之间添加空格（高度= 20dp）？我如何做到这一点？

Answer 1

请使用此方法

private void setDropdownWidthHeight() { 
SearchView.SearchAutoComplete mSearchSrcTextView = (SearchView.SearchAutoComplete) 
searchView.findViewById(android.support.v7.appcompat.R.id.search_src_text); 
mSearchSrcTextView.setDropDownVerticalOffset(100); //height in pixels 
}