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Correct implementation of SearchView in android toolbar

I have a problem with searchview implementation in android toolbar.
The empty space padding is too big.
I don't want to hide other actions, but these actions are
overlapped by SearchView.
SearchView's underline is not visible
How do i fix issues mentioned above ?
menu.xml
<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto">
<item
android:id="#+id/action_search"
android:title="#string/car_num"
android:icon="#drawable/ic_search_white_24dp"
app:actionViewClass="android.support.v7.widget.SearchView"
app:showAsAction="always" />
<item
android:id="#+id/action_add_client"
android:icon="#drawable/ic_account_multiple_plus"
android:title="#string/action_add_client"
app:showAsAction="always" />
</menu>
fragment
#Override
public void onCreateOptionsMenu(final Menu menu, MenuInflater inflater) {
inflater.inflate(R.menu.menu_fragment_reg_vehicles, menu);
final MenuItem item = menu.findItem(R.id.action_search);
searchView = (SearchView) MenuItemCompat.getActionView(item);
searchView.setQueryHint("Search");
searchView.setMaxWidth(Integer.MAX_VALUE);
searchView.setIconifiedByDefault(false);
searchView.setOnQueryTextListener(this);
searchView.setOnCloseListener(new SearchView.OnCloseListener() {
#Override
public boolean onClose() {
setItemsVisibility(menu, item, true);
return false;
}
});
searchView.setOnSearchClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
setItemsVisibility(menu, item, false);
searchView.requestFocus();
}
});
}

Regarding your posted code, this is the output:
As you can see, there is two left margins: the widget's container and the magnify icon. This is why you have an empty space bigger than an another window with a title. And the menu items are pushed outside the toolbar which, I think, it's the default SearchView ActionView when it's not a CollapseActionView so it fills the parent.
From the source of SearchView widget and its layout abc_search_view.xml, I tried to remove the extra margins and avoid pushing the other items outside the toolbar.
But after many manipulations, my guess is you have to use a custom widget and/or a custom layout. Or to play with setIconifiedByDefault(true) which removes the magnify icon and its extra margin and to use setMaxWidth(MAX_SIZE) where MAX_SIZE is calculated dynamically by Integer.MAX_VALUE - (SIZE_OF_A_MENU_ITEM * NB_OF_MENU_ITEMS)... But it requires a lot of work for nothing. So using a custom layout could be the solution.
However, there is a possible way to keep the appcompat widget, some little workarounds. First, to avoid puhsing out the other items, you can use the CollapseActionView.
<item
...
app:actionViewClass="android.support.v7.widget.SearchView"
app:showAsAction="always|collapseActionView"/>
And to maintain your requirements, you have to expand it when you initialize it:
final SearchView searchView =
(SearchView) MenuItemCompat.getActionView(item);
MenuItemCompat.expandActionView(item);
Be aware that you have to use setOnActionExpandListener() in order to close the window if you don't want to collapse the item. This suggestion will give you this result:
Still the extra margins, right? Therefore, you have to retrieve the container and the magnify icon by their ids (which you can find in abc_search_view.xml... but let's save some time: they are R.id.search_edit_frame and R.id.search_mag_icon). You can remove their margins by using this method:
private void changeSearchViewElements(View view) {
if (view == null)
return;
if (view.getId() == R.id.search_edit_frame
|| view.getId() == R.id.search_mag_icon) {
LinearLayout.LayoutParams p =
(LinearLayout.LayoutParams) view.getLayoutParams();
p.leftMargin = 0; // set no left margin
view.setLayoutParams(p);
}
if (view instanceof ViewGroup) {
ViewGroup viewGroup = (ViewGroup) view;
for (int i = 0; i < viewGroup.getChildCount(); i++) {
changeSearchViewElements(viewGroup.getChildAt(i));
}
}
}
By calling it in a thread:
final SearchView searchView =
(SearchView) MenuItemCompat.getActionView(item);
...
searchView.post(new Runnable() {
#Override
public void run() {
changeSearchViewElements(searchView);
}
});
Here's the output:
Finally, to get the line under the field, there is a possible workaround as using a 9-patch drawable and set it as a background. You can easily find how-to on Google. So the condition will be:
private void changeSearchViewElements(View view) {
...
if (view.getId() == R.id.search_edit_frame
|| view.getId() == R.id.search_mag_icon) {
LinearLayout.LayoutParams p =
(LinearLayout.LayoutParams) view.getLayoutParams();
p.leftMargin = 0; // set no left margin
view.setLayoutParams(p);
} else if (view.getId() == R.id.search_src_text) {
AutoCompleteTextView searchEdit = (AutoCompleteTextView) view;
searchEdit.setBackgroundResource(R.drawable.rect_underline_white);
}
...
}
From the OP's comment below, the underline's field can also be done with the following statement:
searchView.findViewById(android.support.v7.appcompat.R.id.se‌​arch_src_text)
.setBa‌​ckgroundResource(R.d‌​rawable.abc_textfiel‌​d_search_default_mtr‌​l_alpha);
After these workarounds, as I said, it might be easier to use a custom layout. But if you want to keep the default SearchView widget, this might help.

Android SearchView Formatting

Spent far too long on this problem now. Have solved most of it, but still struggling with the search hint icon. Having searched extensively this following bit of code does work in my fragment
#Override
public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
SearchManager searchManager = (SearchManager) getActivity().getSystemService(Context.SEARCH_SERVICE);
mSearchView = (SearchView) menu.findItem(R.id.action_search).getActionView();
mSearchView.setSearchableInfo(searchManager.getSearchableInfo(getActivity().getComponentName()));
mSearchView.setIconifiedByDefault(true);
int id = mSearchView.getContext().getResources().getIdentifier("android:id/search_src_text", null, null);
mSearchViewTextView = (TextView) mSearchView.findViewById(id);
mSearchViewTextView.setTextColor(Color.WHITE);
mSearchViewTextView.setHintTextColor(Color.WHITE);
mSearchViewTextView.setBackgroundResource(R.drawable.action_textfield_search_alpha);
mSearchViewSsb = new SpannableStringBuilder(" ");
mSearchViewSsb.append(getResources().getString(R.string.fragment_friend_add_search_hint));
Drawable searchHintIcon = ContextCompat.getDrawable(MyApplication.getContext(), R.drawable.action_search);
int textSize = (int) (mSearchViewTextView.getTextSize() * 1.25);
searchHintIcon.setBounds(0, 0, textSize, textSize);
mSearchViewSsb.setSpan(new ImageSpan(searchHintIcon), 1, 2, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
mSearchViewTextView.setText(mSearchViewSsb);
int id1 = android.support.v7.appcompat.R.id.search_close_btn;
ImageView searchCloseIcon = (ImageView) mSearchView.findViewById(id1);
searchCloseIcon.setImageResource(R.drawable.action_close);
int id2 = android.support.v7.appcompat.R.id.search_button;
ImageView searchIcon = (ImageView) mSearchView.findViewById(id2);
searchIcon.setImageResource(R.drawable.action_search);
super.onCreateOptionsMenu(menu, getActivity().getMenuInflater());
mSearchView.setOnSearchClickListener(...);
mSearchView.setOnQueryTextListener(...);
}
However, it only works once when I call it in onCreateOptionsMenu. I have tried to reuse it in setOnQueryTextListener, but no matter what I do the application then either crashes or just ignores the change.
Also, when it is set once the curious thing is that the first time you have to press the cancel button twice, the first time you press the cancel button the SearchView TextView has all of the enhancements but the SearchHint Icon goes back to its original form.
All I need is that SearchHint icon to be white.
My theme is set to Theme.AppCompat.Light.DarkActionBar

If you just want to make the icon white you can add the following code to your menu file
<item
android:id="#+id/action_search"
android:icon="#drawable/abc_ic_search_api_mtrl_alpha"
android:title="#string/search"
app:actionViewClass="android.support.v7.widget.SearchView"
app:showAsAction="always|collapseActionView"/>

How to remove white underline in a SearchView widget in Toolbar Android

I am using the Toolbar search widget in my project. Everything works fine but expect the thing which I am completely stuck up with removing the underline below the search field in my toolbar. I have tried many solutions and nothing works out. Below are some of the solutions that I tried.
Requirement is to remove white underline in the image
Ist Solution:
//Removing underline
int searchPlateId = searchView.getContext().getResources().getIdentifier("android:id/search_plate", null, null);
View searchPlate = searchView.findViewById(searchPlateId);
if (searchPlate!=null) {
searchPlate.setBackgroundColor (Color.TRANSPARENT);
int searchTextId = searchPlate.getContext ().getResources ().getIdentifier ("android:id/search_src_text", null, null);
}
IInd Solution:
EditText searchEdit = ((EditText)searchView.findViewById(android.support.v7.appcompat.R.id.search_src_text));
searchEdit.setBackgroundColor(Color.TRANSPARENT);
The above code works to change the background of EditText but still underline is displaying below the close icon in SearchBar.
Complete code that I am using for SearchBar widget as follows:
#Override
public void onCreateOptionsMenu(Menu menu, MenuInflater infl) {
super.onCreateOptionsMenu(menu, infl);
MenuInflater inflater = getActivity().getMenuInflater();
inflater.inflate(R.menu.action_search, menu);
final SearchView searchView = (SearchView) MenuItemCompat
.getActionView(menu.findItem(R.id.search));
SearchManager searchManager = (SearchManager) getActivity ().getSystemService (getActivity ().SEARCH_SERVICE);
searchView.setSearchableInfo (searchManager.getSearchableInfo (getActivity ().getComponentName ()));
//changing edittext color
EditText searchEdit = ((EditText)searchView.findViewById(android.support.v7.appcompat.R.id.search_src_text));
searchEdit.setTextColor(Color.WHITE);
}
action_search.xml
<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:compat="http://schemas.android.com/apk/res-auto">
<item android:id="#+id/search"
android:title="Search"
android:icon="#drawable/abc_ic_search_api_mtrl_alpha"
compat:showAsAction="ifRoom|collapseActionView"
compat:actionViewClass="android.support.v7.widget.SearchView" />
</menu>
possible duplicate of this

If you are using SearchView then use for API below 21
android:queryBackground="#android:color/transparent"
you can use below code if you are using API 21 or more
app:queryBackground="#android:color/transparent"

Once try as follows
View v = searchView.findViewById(android.support.v7.appcompat.R.id.search_plate);
v.setBackgroundColor(Color.parseColor("here give actionbar color code"));
Hope this will helps you.

Just add this line if you are using a v7 or androidx widget
app:queryBackground="#android:color/transparent"

Or you can do this through styles:
<style name="SearchViewMy" parent="Widget.AppCompat.Light.SearchView">
<item name="submitBackground">#color/primaryColor</item>
<item name="queryBackground">#color/primaryColor</item>
</style>
queryBackground is attribute for the query background. If you support voice search you may want to remove the line also under that mic button. Thats what submitBackground attribute is for.
Then of course apply the style to your theme.
<style name="Theme.App" parent="Theme.AppCompat.Light.NoActionBar.FullScreen">
<item name="searchViewStyle">#style/SearchViewMy</item>
</style>

For AndroidX I used this based on other answers here,
searchView.findViewById(androidx.appcompat.R.id.search_plate)
.setBackgroundColor(Color.TRANSPARENT)

if you want to remove the underline from SearchView, then just copy paste the below code to your SearchView. it works
android:queryBackground="#null"
like this,
<SearchView
android:id="#+id/searchView"
android:layout_width="match_parent"
android:layout_height="100dp"
android:queryBackground="#null"
/>

You can try using the below code, works like a charm for me.
View v = searchView.findViewById(android.support.v7.appcompat.R.id.search_plate);
v.setBackgroundColor(ContextCompat.getColor(context,android.R.color.transparent));

The below piece of code works for me.
val searchView = menu?.findItem(R.id.action_search)?.actionView as SearchView
searchView.findViewById<View>(androidx.appcompat.R.id.search_plate).background = null

For androidx and kotlin:
menuInflater.inflate(R.menu.conversation_list_screen_menu, menu)
val searchItem = menu.findItem(R.id.action_search)
searchView = searchItem.actionView as SearchView
searchView?.findViewById<View>(androidx.appcompat.R.id.search_plate)?.setBackgroundColor(Color.TRANSPARENT)

The code for changing the background color of SearchView edit text is below
public static void setSearchViewEditTextBackgroundColor(Context context, SearchView searchView, int backgroundColor){
int searchPlateId = context.getResources().getIdentifier("android:id/search_plate", null, null);
ViewGroup viewGroup = (ViewGroup) searchView.findViewById(searchPlateId);
viewGroup.setBackgroundColor(ComponentUtils.getColor(context, backgroundColor));
}
If your action bar background color is white then call the above method as follow.
setSearchViewEditTextBackgroundColor(this, searchView, R.color.white);
Now the underline from SearchView edit text will disappear.

First you should get the bottom line simply like this:
searchPlate = (View) findViewById(R.id.search_plate);
Then you should set background color to transparent like this:
searchPlate.setBackgroundColor(Color.TRANSPARENT);
This works perfectly for androidx.appcompat.widget.SearchView!

ActionBar SearchView not fully expanding in landscape mode

When using the action bar search interface, the widget expands to occupy the full width of the screen in portrait mode, but stops short in landscape mode.
Is there a way to set the expansion layout params on the SearchView to fully fill the action bar when the user is typing a search?
See image:
Note: I'm not currently using ActionBar Sherlock
Edit:
Here's what I did to get it to extend the full width.
searchView.setOnSearchClickListener(new OnClickListener() {
private boolean extended = false;
#Override
public void onClick(View v) {
if (!extended) {
extended = true;
LayoutParams lp = v.getLayoutParams();
lp.width = LayoutParams.MATCH_PARENT;
}
}
});

MenuItemCompat's SearchView has a property named maxWidth.
final MenuItem searchItem = menu.findItem(R.id.action_search);
final SearchView searchView = (SearchView) MenuItemCompat.getActionView(searchItem);
searchView.setMaxWidth(xxx);
use screen width instead of xxx offcourse

Did you try something like that?
editView.setOnKeyListener(new OnKeyListener() {
private boolean extended = false;
#Override
public boolean onKey(View v, int keyCode, KeyEvent event) {
if (!extended && event.getAction() == KeyEvent.ACTION_DOWN) {
extended = true;
LayoutParams lp = v.getLayoutParams();
lp.width = LayoutParams.MATCH_PARENT;
}
return false;
}
});

I figured out a solution for fully expanding the search view in landscape and to also have the action view already expanded when the activity is created. Here how it works:
1.First create an xml file in your res-menu folder called for example : searchview_in_menu.xml. Here you would have the following code:
<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android" >
<item android:id="#+id/action_search"
android:title="#string/search"
android:icon="#android:drawable/ic_menu_search"
android:actionLayout="#layout/searchview_layout" />
</menu>
Note: "#string/search" - looks something like this in the res-strings.xml:
<string name="search">Search</string>
2.Second create the layout referred above ("#layout/searchview_layout") in res-layout folder. The new layout: searchview_layout.xml will look like this:
<?xml version="1.0" encoding="utf-8"?>
<SearchView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/search_view_layout"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
Note: Here we are setting the search view width to match the width of its parent( android:layout_width="match_parent")
3.In your MainActivity class or in the activity that has to implement the Search View write in the onCreateOptionsMenu() method the following code:
#Override
public boolean onCreateOptionsMenu(Menu menu) {
super.onCreateOptionsMenu(menu);
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.searchview_in_menu, menu);
//find the search view item and inflate it in the menu layout
MenuItem searchItem = menu.findItem(R.id.action_search);
mSearchView = (SearchView) searchItem.getActionView();
//set a hint on the search view (optional)
mSearchView.setQueryHint(getString(R.string.search));
//these flags together with the search view layout expand the search view in the landscape mode
searchItem.setShowAsActionFlags(MenuItem.SHOW_AS_ACTION_COLLAPSE_ACTION_VIEW
| MenuItem.SHOW_AS_ACTION_ALWAYS);
//expand the search view when entering the activity(optional)
searchItem.expandActionView();
return true;
}

Adjust the width layout param to MATCH_PARENT, that way the SearchView will fully expand in either portrait or landscape
ViewGroup.LayoutParams layoutParams = mSearchView.getLayoutParams();
layoutParams.width = ViewGroup.LayoutParams.MATCH_PARENT;

For ActionBarCompat use this:
MenuItemCompat.setShowAsAction(searchItem, MenuItem.SHOW_AS_ACTION_COLLAPSE_ACTION_VIEW
| MenuItem.SHOW_AS_ACTION_ALWAYS);
MenuItemCompat.expandActionView(searchItem);

Use this (100%):
mSearchView = (SearchView) searchItem.getActionView();
mSearchView.setLayoutParams(new LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.WRAP_CONTENT));

How to change the default icon on the SearchView, to be use in the action bar on Android?

I'm having a bit of trouble customizing the search icon in the SearchView. On my point of view, the icon can be changed in the Item attributes, right? Just check the code bellow..
Can someone tell me what I'm doing wrong?
This is the menu I'm using, with my custom search icon icn_lupa. But when I run the app, I always get the default search icon...
<menu xmlns:android="http://schemas.android.com/apk/res/android">
<item android:id="#+id/menu_search"
android:title="#string/menu_search"
android:icon="#drawable/icn_lupa"
android:showAsAction="always"
android:actionViewClass="android.widget.SearchView" />
</menu>

I've found another way to change the search icon which goes in the same line as Diego Pino's answer but straight in onPrepareOptionsMenu.
In your menu.xml (same as before)
<menu xmlns:android="http://schemas.android.com/apk/res/android">
<item android:id="#+id/action_search"
android:icon="#drawable/ic_action_fav"
android:title="#string/action_websearch"
android:showAsAction="always|never"
android:actionViewClass="android.widget.SearchView" />
</menu>
In your activity:
#Override
public boolean onPrepareOptionsMenu(Menu menu) {
MenuItem searchViewMenuItem = menu.findItem(R.id.action_search);
mSearchView = (SearchView) searchViewMenuItem.getActionView();
int searchImgId = getResources().getIdentifier("android:id/search_button", null, null);
ImageView v = (ImageView) mSearchView.findViewById(searchImgId);
v.setImageResource(R.drawable.your_new_icon);
mSearchView.setOnQueryTextListener(this);
return super.onPrepareOptionsMenu(menu);
}
I followed the example for changing the edittext in this example.
You should be able to do this for all icons/backgrounds in your SearchView, to find the right ID you can check here.
UPDATE November 2017:
Since this answer android has been updated with the possibility of changing the search icon through the XML.
If you target anything below android v21 you can use:
<android.support.v7.widget.SearchView
android:layout_width="wrap_content"
android:layout_height="match_parent"
app:searchIcon="#drawable/ic_search_white_24dp"
app:closeIcon="#drawable/ic_clear_white_24dp" />
Or v21 and later:
<SearchView
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:searchIcon="#drawable/ic_search_white_24dp"
android:closeIcon="#drawable/ic_clear_white_24dp" />
And there are even more options:
closeIcon
commitIcon
goIcon
searchHintIcon
searchIcon
voiceIcon

Nice answer from #just_user
For my case, since I am using the appcompat v7 library for the SearchView + ActionBar, i modified his solution a bit to make it compatible to my project, it should work so as long as you did not modify anything when you added appcompat v7 as library
XML:
<menu xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:metrodeal="http://schemas.android.com/apk/res-auto" >
<item
android:id="#+id/main_menu_action_search"
android:orderInCategory="100"
android:title="#string/search"
metrodeal:showAsAction="always"
metrodeal:actionViewClass="android.support.v7.widget.SearchView"
android:icon="#drawable/search_btn"/>
</menu>
Java code:
#Override
public void onPrepareOptionsMenu(Menu menu) {
MenuItem searchViewMenuItem = menu.findItem(R.id.main_menu_action_search);
SearchView mSearchView = (SearchView) MenuItemCompat.getActionView(searchViewMenuItem);
int searchImgId = android.support.v7.appcompat.R.id.search_button; // I used the explicit layout ID of searchview's ImageView
ImageView v = (ImageView) mSearchView.findViewById(searchImgId);
v.setImageResource(R.drawable.search_btn);
super.onPrepareOptionsMenu(menu);
}
Excuse for the very big icon (I have not resized the icon just yet), but it should work as it is.

I was struggling with this too but then I accidentaly used 'collapseActionView' and that fixed it!
My menu.xml looks like this now:
<menu xmlns:android="http://schemas.android.com/apk/res/android">
<item android:id="#+id/menu_search"
android:title="#string/menu_search"
android:showAsAction="always|withText|collapseActionView"
android:actionViewClass="android.widget.SearchView"
android:icon="#android:drawable/ic_menu_search" />
</menu>
The downside of this is that on tablets the SearchView will appear on the left side of the ActionBar instead of where the searchicon is, but I don't mind that.

I defined a style to do it .
here is my xml:
<android.support.v7.widget.SearchView
android:id="#+id/sv_search"
android:icon="#android:drawable/ic_menu_search"
android:layout_width="fill_parent"
**style="#style/CitySearchView"**
android:layout_height="wrap_content"/>
and this is my style:
<style name="CitySearchView" parent="Base.Widget.AppCompat.SearchView">
<item name="searchIcon">#drawable/ic_more_search</item>
</style>
That it！
After finish that，just take a look at Base.Widget.AppCompat.SearchView.
<style name="Base.Widget.AppCompat.SearchView" parent="android:Widget">
<item name="layout">#layout/abc_search_view</item>
<item name="queryBackground">#drawable/abc_textfield_search_material</item>
<item name="submitBackground">#drawable/abc_textfield_search_material</item>
<item name="closeIcon">#drawable/abc_ic_clear_mtrl_alpha</item>
<item name="searchIcon">#drawable/abc_ic_search_api_mtrl_alpha</item>
<item name="goIcon">#drawable/abc_ic_go_search_api_mtrl_alpha</item>
<item name="voiceIcon">#drawable/abc_ic_voice_search_api_mtrl_alpha</item>
<item name="commitIcon">#drawable/abc_ic_commit_search_api_mtrl_alpha</item>
<item name="suggestionRowLayout">#layout/abc_search_dropdown_item_icons_2line</item>
</style>
every item can be override by define a new style .
Hope it helps!

There's a way to do this. The trick is to recover the ImageView using its identifier and setting a new image with setImageResource(). This solution is inspired on Changing the background drawable of the searchview widget.
private SearchView searchbox;
private void customizeSearchbox() {
setSearchHintIcon(R.drawable.new_search_icon);
}
private void setSearchHintIcon(int resourceId) {
ImageView searchHintIcon = (ImageView) findViewById(searchbox,
"android:id/search_mag_icon");
searchHintIcon.setImageResource(resourceId);
}
private View findViewById(View v, String id) {
return v.findViewById(v.getContext().getResources().
getIdentifier(id, null, null));
}

SearchView searchView = (SearchView) findViewById(R.id.address_search);
try {
Field searchField = SearchView.class
.getDeclaredField("mSearchButton");
searchField.setAccessible(true);
ImageView searchBtn = (ImageView) searchField.get(searchView);
searchBtn.setImageResource(R.drawable.search_glass);
} catch (NoSuchFieldException e) {
} catch (IllegalAccessException e) {
}

After some research I found the solution here. The trick is that the icon is not in an ImageView but in the Spannable object.
// Accessing the SearchAutoComplete
int queryTextViewId = getResources().getIdentifier("android:id/search_src_text", null, null);
View autoComplete = searchView.findViewById(queryTextViewId);
Class<?> clazz = Class.forName("android.widget.SearchView$SearchAutoComplete");
SpannableStringBuilder stopHint = new SpannableStringBuilder(" ");
stopHint.append(getString(R.string.your_new_text));
// Add the icon as an spannable
Drawable searchIcon = getResources().getDrawable(R.drawable.ic_action_search);
Method textSizeMethod = clazz.getMethod("getTextSize");
Float rawTextSize = (Float)textSizeMethod.invoke(autoComplete);
int textSize = (int) (rawTextSize * 1.25);
searchIcon.setBounds(0, 0, textSize, textSize);
stopHint.setSpan(new ImageSpan(searchIcon), 1, 2, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
// Set the new hint text
Method setHintMethod = clazz.getMethod("setHint", CharSequence.class);
setHintMethod.invoke(autoComplete, stopHint);

In menu xml:
<item
android:id="#+id/menu_filter"
android:actionLayout="#layout/menu_filter"
android:icon="#drawable/ic_menu_filter"
android:orderInCategory="10"
android:showAsAction="always"
android:title="#string/menu_filter"/>
and create the layout/menu_filter:
<?xml version="1.0" encoding="utf-8"?>
<SearchView
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:searchIcon="#drawable/ic_menu_filter"/>
then in activity's onCreateOptionsMenu or onPrepareOptionsMenu:
SearchView searchView = (SearchView) menu.findItem(R.id.menu_filter).getActionView();
searchView.setOnQueryTextListener(this);

It looks like the actionViewClass overides the icon and it doesn't look like you can change it from this class.
You got two solutions:
Live with it and I think it's the best option in terms of user experience and platform conformity.
Define your own actionViewClass

<SearchView
android:searchIcon="#drawable/ic_action_search"
..../>
use the searchIcon xml tag

This works with Material Design (MaterialComponents theme) and BottomAppBar.
If you are using androidx library, for example:
<item
android:id="#+id/sv"
android:title="#string/search"
app:actionViewClass="androidx.appcompat.widget.SearchView"
app:showAsAction="always" />
You can create a method and invoke it from wherever you want:
/**
* Set SearchView Icon
* #param i Drawable icon
*/
private void setSVIcon(int i) {
ImageView iv = searchView.findViewById(androidx.appcompat.R.id.search_button);
iv.setImageDrawable(ResourcesCompat.getDrawable(getResources(), i, null));
}
Usage example:
#Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(m, menu);
MenuItem mn = menu.findItem(R.id.sv);
if (mn != null) {
searchview = (SearchView) mn.getActionView();
setSVIcon(R.drawable.ic_sr);
}
}

Update hint of AutocompleteTextView for updating search icon in the expanded mode, copied from android source,
#Override
public boolean onPrepareOptionsMenu(Menu menu) {
mSearchMenuItem = menu.findItem(R.id.action_search);
SearchView searchView = (SearchView) mSearchMenuItem.getActionView();
int searchImgId = getResources().getIdentifier("android:id/search_button", null, null);
ImageView v = (ImageView) searchView.findViewById(searchImgId);
v.setImageResource(R.drawable.search_or);
int searchTextViewId = searchView.getContext().getResources().getIdentifier("android:id/search_src_text", null, null);
AutoCompleteTextView searchTextView = (AutoCompleteTextView) searchView.findViewById(searchTextViewId);
searchTextView.setHintTextColor(getResources().getColor(R.color.hint_color_white));
searchTextView.setTextColor(getResources().getColor(android.R.color.white));
searchTextView.setTextSize(18.0f);
SpannableStringBuilder ssb = new SpannableStringBuilder(" "); // for the icon
ssb.append(hintText);
Drawable searchIcon = getResources().getDrawable(R.drawable.search_or);
int textSize = (int) (searchTextView.getTextSize() * 1.25);
searchIcon.setBounds(0, 0, textSize, textSize);
ssb.setSpan(new ImageSpan(searchIcon), 1, 2, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
searchTextView.setHint(ssb);
return super.onPrepareOptionsMenu(menu);
}

From API 21 you can change it in xml:
android:searchIcon="#drawable/loupe"
android:closeIcon="#drawable/x_white"

for api level < 21, i did this:
int searchImgId = getResources().getIdentifier("android:id/search_mag_icon", null, null);
ImageView ivIcon = (ImageView) searchView.findViewById(searchImgId);
if(ivIcon!=null)
ivIcon.setImageResource(R.drawable.ic_search);
from this
to this

There are three magnifying glass icons. two of them are shown when IconizedByDefault is true(one which is shown before pressing and one is shown in the "hint") and one is shown all the time when IconizedByDefault is false. all the fields are private so the way to get them is by their xml id. (most of the code is mentioned separately in other answers in this post already)
when IconizedByDefault is true change the icon in the hint (which is seen only after pressing the icon) by :
mSearchSrcTextView = (SearchAutoComplete)findViewById(R.id.search_src_text);
then do the same as in the android source code:
final int textSize = (int) (mSearchSrcTextView.getTextSize() * 1.25);
newSearchIconDrawable.setBounds(0, 0, textSize, textSize);
final SpannableStringBuilder ssb = new SpannableStringBuilder(" ");
ssb.setSpan(new ImageSpan(newSearchIconDrawable), 1, 2, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
ssb.append(hintText);
mSearchHintIcon was replaced with newSearchIconDrawable which is your new search icon.
Then set the hint with
mSearchSrcTextView.setHint(ssb);
The other 2 icons are in an ImageView, which can be found by their Id.
for the icon when searchview is closed (when iconizedByDefault is true) do:
mSearchButton = (ImageView) findViewById(R.id.search_button);
and for the one that always appears (if iconizedByDefault is false)
mCollapsedIcon = (ImageView) findViewById(R.id.search_mag_icon);

Desperate solution using Kotlin
val s = (searchView.getAllChildren().firstOrNull() as? LinearLayout)?.getAllChildren()?.filter { it is AppCompatImageView }?.firstOrNull() as? AppCompatImageView
s?.setImageResource(R.drawable.search)
getAllChildren:
fun ViewGroup.getAllChildren() : ArrayList<View> {
val views = ArrayList<View>()
for (i in 0..(childCount-1)) {
views.add(getChildAt(i))
}
return views
}
Hope it helps someone.

My solution:
Use two menu xml files. In one of the xmls the menu item has an actionView and in the other one no. Initially inflate the collapsed menu and when the menu item is clicked, invalidate the menu and inflate the expanded menu xml and make sure you call setIconified(false);
#Override
public void onCreateOptionsMenu(Menu menu, MenuInflater inflater)
{
if(!mShowSearchView)
{
inflater.inflate(R.menu.menu_collapsed, menu);
}
else
{
inflater.inflate(R.menu.menu_expanded, menu);
MenuItem searchItem = menu.findItem(R.id.action_search);
SearchView searchView = (SearchView) MenuItemCompat.getActionView(searchItem);
searchView.setIconified(false);
searchView.setOnCloseListener(new OnCloseListener()
{
#Override
public boolean onClose()
{
mShowSearchView = false;
ActivityCompat.invalidateOptionsMenu(getActivity());
return false;
}
});
}
super.onCreateOptionsMenu(menu, inflater);
}
#Override
public boolean onOptionsItemSelected(MenuItem item)
{
if (item.getItemId() == R.id.action_filter)
{
menu.showMenu();
}
else if (item.getItemId() == R.id.action_search)
{
mShowSearchView = true;
ActivityCompat.invalidateOptionsMenu(getActivity());
}
return super.onOptionsItemSelected(item);
}

Just name your icon the same name as the icon that is used by the search view. When it compiles it takes the resource in the project over the icon in the library.

I use the AppCompat library. Yes, specifying android:icon="#drawable/search_icon_png" doesnt work.
So i looked into the source code of #style/Theme.AppCompat and found the icon that android uses.
<item name="searchViewSearchIcon">#drawable/abc_ic_search</item>
So if you rename your search icon inside your drawables to abc_ic_search.png, this icon is rendered as its found in your app drawable first, rather than the appcompat drawable folder.
Works for me :)
Using this approach you can customize the close and clear icons for the search widget as well.