如何在SearchView打开时将边距放在操作栏图标上？

<androidx.appcompat.widget.Toolbar
    android:id="@+id/toolbar"
    android:layout_width="match_parent"
    android:layout_height="?attr/actionBarSize"
    android:background="?attr/colorPrimary">

    <SearchView
        android:id="@+id/searchView"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:iconifiedByDefault="false"
        android:queryHint="Search"
        android:layout_marginStart="8dp"
        android:layout_marginEnd="8dp" />

</androidx.appcompat.widget.Toolbar>

Toolbar toolbar = findViewById(R.id.toolbar);
setSupportActionBar(toolbar);

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    getMenuInflater().inflate(R.menu.menu_main, menu);

    MenuItem searchItem = menu.findItem(R.id.action_search);
    SearchView searchView = (SearchView) searchItem.getActionView();
    
    // 设置SearchView的监听器
    searchView.setOnSearchClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            // 调整边距
            searchView.setIconifiedByDefault(false);
            searchView.setPadding(0, 0, 0, 0);
        }
    });

    return true;
}