使用自定义适配器的ListView。按钮删除Firebase数据库中的子项

public class CustomAdapter extends BaseAdapter {
    private List<String> data;
    private Context context;

    public CustomAdapter(List<String> data, Context context) {
        this.data = data;
        this.context = context;
    }

    @Override
    public int getCount() {
        return data.size();
    }

    @Override
    public Object getItem(int position) {
        return data.get(position);
    }

    @Override
    public long getItemId(int position) {
        return position;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        if (convertView == null) {
            convertView = LayoutInflater.from(context).inflate(R.layout.list_item, parent, false);
        }

        TextView textView = convertView.findViewById(R.id.text_view);
        textView.setText(data.get(position));

        return convertView;
    }
}

public class MainActivity extends AppCompatActivity {
    private ListView listView;
    private CustomAdapter adapter;
    private DatabaseReference databaseRef;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        listView = findViewById(R.id.list_view);
        Button deleteButton = findViewById(R.id.delete_button);

        // 初始化Firebase数据库引用
        databaseRef = FirebaseDatabase.getInstance().getReference("items");

        // 从Firebase数据库中获取数据
        databaseRef.addValueEventListener(new ValueEventListener() {
            @Override
            public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
                List<String> data = new ArrayList<>();
                for (DataSnapshot snapshot : dataSnapshot.getChildren()) {
                    String item = snapshot.getValue(String.class);
                    data.add(item);
                }

                // 使用自定义适配器填充ListView
                adapter = new CustomAdapter(data, MainActivity.this);
                listView.setAdapter(adapter);
            }

            @Override
            public void onCancelled(@NonNull DatabaseError databaseError) {
                Log.e("Firebase", "Failed to read value.", databaseError.toException());
            }
        });

        // 删除按钮点击事件
        deleteButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                // 删除Firebase数据库中的子项
                databaseRef.child("child_item").removeValue();
            }
        });
    }
}