如何制作圆形边框SearchView？

<SearchView
    android:id="@+id/searchView"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:background="@drawable/rounded_border"
    android:queryHint="Search"
    android:iconifiedByDefault="false"
    android:padding="8dp"
    android:paddingStart="16dp"
    android:paddingEnd="16dp"
    android:imeOptions="actionSearch"
    android:inputType="text"
    android:maxLines="1"
    android:ellipsize="end"
    android:theme="@style/Widget.AppCompat.SearchView"
    />

<shape xmlns:android="http://schemas.android.com/apk/res/android">
    <solid android:color="#FFFFFF" />
    <corners android:radius="20dp" />
    <stroke
        android:width="2dp"
        android:color="#000000" />
</shape>

SearchView searchView = findViewById(R.id.searchView);
searchView.setOnQueryTextListener(new SearchView.OnQueryTextListener() {
    @Override
    public boolean onQueryTextSubmit(String query) {
        // 处理搜索提交事件
        return true;
    }

    @Override
    public boolean onQueryTextChange(String newText) {
        // 处理搜索文本变化事件
        return true;
    }
});