Android Actionbar SearchView 更改图标并删除多余的间距

我正在实施SearchView。我已成功添加搜索视图及其所有功能。现在我想让它看起来很棒。

我需要两个改变，我尝试了一切，但没有任何效果对我来说：

1. 我想更改搜索图标。
2. 我想删除 searchView 左侧的额外间距。

这就是我的 searchView 目前的样子：

这就是我想做的

菜单/menu_search_action.xml

<menu 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"
tools:context=".MainActivity">

<item
    android:id="@+id/action_search"
    android:icon="@drawable/location_icon"
    android:orderInCategory="100"
    android:title="@string/action_search"
    app:actionViewClass="android.support.v7.widget.SearchView"
    app:showAsAction="always|collapseActionView" />

搜索类别Activity.java

    @Override
public boolean onCreateOptionsMenu(Menu menu) {
    MenuInflater inflater = getMenuInflater();
    inflater.inflate(R.menu.menu_search_action, menu);


    MenuItem searchItem = menu.findItem(R.id.action_search);
    searchItem.expandActionView();
    MenuItemCompat.setOnActionExpandListener(searchItem, new MenuItemCompat.OnActionExpandListener() {
        @Override
        public boolean onMenuItemActionExpand(MenuItem item) {

            return true;
        }

        @Override
        public boolean onMenuItemActionCollapse(MenuItem item) {

            //DO SOMETHING WHEN THE SEARCHVIEW IS CLOSING
            back();
            return false;
        }
    });

    SearchManager searchManager = (SearchManager) getSystemService(Context.SEARCH_SERVICE);
    searchView = (SearchView) MenuItemCompat
            .getActionView(searchItem);
    if (searchView != null) {
        searchView.setSearchableInfo(searchManager
                .getSearchableInfo(getComponentName()));
        searchView.setIconifiedByDefault(false);
        searchView.setOnQueryTextListener(new SearchView.OnQueryTextListener() {
                    @Override
                    public boolean onQueryTextSubmit(String query) {
                        callSearch(query);
                        return true;
                    }

                    @Override
                    public boolean onQueryTextChange(String newText) {
                        callSearch(newText);
                        return true;
                    }
                });
    }

    for (TextView textView : findChildrenByClass(searchView, TextView.class)) {
        textView.setTextColor(Color.WHITE);
    }
    return super.onCreateOptionsMenu(menu);

}


@Override
public boolean onOptionsItemSelected(MenuItem item) {
    switch (item.getItemId()) {
        case android.R.id.home:
            back();
            return true;
        default:
            return super.onOptionsItemSelected(item);
    }
}

@Override
public void onBackPressed() {
    back();
}

private void back() {
    finish();
}

public static <V extends View> Collection<V> findChildrenByClass(
        ViewGroup viewGroup, Class<V> clazz) {
    return gatherChildrenByClass(viewGroup, clazz, new ArrayList<V>());
}

private static <V extends View> Collection<V> gatherChildrenByClass(
        ViewGroup viewGroup, Class<V> clazz, Collection<V> childrenFound) {

    for (int i = 0; i < viewGroup.getChildCount(); i++) {
        final View child = viewGroup.getChildAt(i);
        if (clazz.isAssignableFrom(child.getClass())) {
            childrenFound.add((V) child);
        }
        if (child instanceof ViewGroup) {
            gatherChildrenByClass((ViewGroup) child, clazz, childrenFound);
        }
    }

    return childrenFound;
}

添加一个单独的Theme如下更改搜索图标。

<style name="AppTheme.SearchView" parent="Widget.AppCompat.SearchView">
    <item name="searchIcon">@mipmap/ic_search_white</item>
    <item name="closeIcon">@mipmap/ic_clear_white</item>
</style>

在你的里面Base Theme

<!-- Base application theme. -->
<style name="MyMaterialTheme.Base" parent="Theme.AppCompat.Light.DarkActionBar">

    <item name="searchViewStyle">@style/AppTheme.SearchView</item>

</style>