补全上面代码的xml代码和activity

XML代码：

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <ListView
        android:id="@+id/listView"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_above="@+id/editText"
        android:divider="@null"
        android:dividerHeight="0dp"
        android:stackFromBottom="true" />

    <EditText
        android:id="@+id/editText"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:hint="Type message here"
        android:inputType="text" />

</RelativeLayout>

Activity代码：

public class MainActivity extends AppCompatActivity {

    private ListView listView;
    private EditText editText;
    private ChatAdapter chatAdapter;
    private List<Message> messageList;

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

        listView = findViewById(R.id.listView);
        editText = findViewById(R.id.editText);

        messageList = new ArrayList<>();
        chatAdapter = new ChatAdapter(this, messageList);
        listView.setAdapter(chatAdapter);

        editText.setOnEditorActionListener(new TextView.OnEditorActionListener() {
            @Override
            public boolean onEditorAction(TextView textView, int i, KeyEvent keyEvent) {
                if (i == EditorInfo.IME_ACTION_SEND) {
                    String message = editText.getText().toString();
                    if (!message.isEmpty()) {
                        sendMessage(message);
                        editText.setText("");
                    }
                    return true;
                }
                return false;
            }
        });
    }

    private void sendMessage(String message) {
        messageList.add(new Message(message, true));
        chatAdapter.notifyDataSetChanged();

        // AI回复逻辑
        String reply = ChitGPT.getReply(message);
        messageList.add(new Message(reply, false));
        chatAdapter.notifyDataSetChanged();

        // 滚动到最后一条消息
        listView.smoothScrollToPosition(messageList.size() - 1);
    }
}