java - 如何制作更适合的fragment

Question

    @RequiresApi(api = Build.VERSION_CODES.Q)
    public void onViewCreated() {

        recyclerView = recyclerView.findViewById(R.id.nowplayinglist);
        recyclerView.setLayoutManager(new LinearLayoutManager(getActivity().getApplicationContext()));

        int permissionCheck = ContextCompat.checkSelfPermission(this,
            Manifest.permission.READ_EXTERNAL_STORAGE);

        if (permissionCheck == PackageManager.PERMISSION_GRANTED) {
            setupUI();
        } else {

            ActivityCompat.requestPermissions(this,
                new String[] {
                    Manifest.permission.READ_EXTERNAL_STORAGE
                },
                CALL);
        }
    }

如何更改 Activitycompat 和 contextcompat 以使其更适合 fragment 而不是 Activity？

Answer 1

您需要将 this 关键字替换为 requireActivity()，因为它应该引用 Activity 而不是 Fragment

因此将您的代码更新为:

int permissionCheck = ContextCompat.checkSelfPermission(requireActivity(),
        Manifest.permission.READ_EXTERNAL_STORAGE);

ActivityCompat.requestPermissions(requireActivity(),
         new String[]{Manifest.permission.READ_EXTERNAL_STORAGE},
         CALL);