我已经从我的片段和UI的图像粘贴代码。我如何用标题'关于'替换应用程序标题以及添加一个返回箭头，这样用户就可以返回到上一个屏幕。

import android.content.Context;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import androidx.appcompat.app.AppCompatActivity;
import androidx.fragment.app.Fragment;
import com.milople.fajralarm.R;
import java.util.Objects;
public class AboutFragment extends Fragment {
    TextView lbllink;
    View view;
    Context ctx;
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        ctx=getActivity();
        view= inflater.inflate(R.layout.fragment_about, container, false);
        lbllink=view.findViewById(R.id.lbllink);
        lbllink.setOnClickListener(v -> {
            Intent intent=new Intent(Intent.ACTION_VIEW, Uri.parse("https://thehalallife.co.uk/"));
            startActivity(intent);
        });
        Objects.requireNonNull(((AppCompatActivity) requireActivity()).getSupportActionBar()).setSubtitle("");
        return view;
    }
} ```
[screenshot of UI][2]
  [2]: https://i.stack.imgur.com/BZ83X.png

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