Android ListView simple_expandable_list_item_2の使用

ListView listView1 = findViewById(R.id.listView1);
 
List<HashMap<String, String>> list = new ArrayList<>();
for (int i = 0; i < 50; i++) {
    HashMap<String, String> hashMap = new HashMap<>();
    hashMap.put("Id", "ID " + i);
    hashMap.put("Value", "Value  = " + i);
    list.add(hashMap);
}
 
SimpleAdapter adapter = new SimpleAdapter(
        this,
        list, // 表示 List
        android.R.layout.simple_expandable_list_item_2,
        new String[]{"Id", "Value"}, // hashMapの Key
        new int[]{android.R.id.text1, android.R.id.text2}
);
 
listView1.setAdapter(adapter);