如何显示一个5秒OnButtonClick的ProgressBar，然后显示一个TextView？

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingLeft="16dp"
    android:paddingTop="16dp"
    android:paddingRight="16dp"
    android:paddingBottom="16dp"
    tools:context=".MainActivity">

    <ProgressBar
        android:id="@+id/progressBar"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true"
        android:visibility="gone" />

    <TextView
        android:id="@+id/textView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true"
        android:text="Hello World!"
        android:textSize="24sp"
        android:visibility="gone" />

    <Button
        android:id="@+id/button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@id/textView"
        android:layout_centerHorizontal="true"
        android:text="Start"
        android:textSize="18sp" />

</RelativeLayout>

public class MainActivity extends AppCompatActivity {

    private ProgressBar progressBar;
    private TextView textView;
    private Button button;

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

        progressBar = findViewById(R.id.progressBar);
        textView = findViewById(R.id.textView);
        button = findViewById(R.id.button);

        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                showProgressBar();
            }
        });
    }

    private void showProgressBar() {
        progressBar.setVisibility(View.VISIBLE);
        button.setEnabled(false);

        new Handler().postDelayed(new Runnable() {
            @Override
            public void run() {
                progressBar.setVisibility(View.GONE);
                textView.setVisibility(View.VISIBLE);
                button.setEnabled(true);
            }
        }, 5000);
    }
}