androidx.recyclerview.widget.RecyclerView#requestFocus ( )源码实例Demo

@Override
public void onResume() {
    super.onResume();

    if (getActivity() == null) {
        return;
    }

    if (current_nodes_type == entryNodes) {
        getActivity().setTitle(R.string.pref_tor_entry_nodes);
    } else if (current_nodes_type == excludeNodes) {
        getActivity().setTitle(R.string.pref_tor_exclude_nodes);
    } else if (current_nodes_type == exitNodes) {
        getActivity().setTitle(R.string.pref_tor_exit_nodes);
    } else if (current_nodes_type == excludeExitNodes) {
        getActivity().setTitle(R.string.pref_tor_exclude_exit_nodes);
    }

    CheckBox chbTorCountriesSelectorAll = getActivity().findViewById(R.id.chbTorCountriesSelectorAll);
    chbTorCountriesSelectorAll.setOnCheckedChangeListener(this);

    ((SearchView) getActivity().findViewById(R.id.searhTorCountry)).setOnQueryTextListener(this);

    RecyclerView rvSelectCountries = getActivity().findViewById(R.id.rvSelectCountries);
    RecyclerView.LayoutManager mLayoutManager = new LinearLayoutManager(getActivity());
    rvSelectCountries.setLayoutManager(mLayoutManager);
    rvSelectCountries.requestFocus();
    rvAdapter = new CountriesAdapter();
    rvSelectCountries.setAdapter(rvAdapter);
}
 

@Override
public void onScrolled(@NonNull RecyclerView recyclerView, int dx, int dy) {
    super.onScrolled(recyclerView, dx, dy);

    if (recyclerView.getScrollState() != RecyclerView.SCROLL_STATE_SETTLING) {
        recyclerView.requestFocus();
    }
}