我正在使用 PreferenceFragmentCompat 做一個應(yīng)用程序，我需要向我的首選項添加一個選項 TimePicker，但是當(dāng)我單擊此選項時我的應(yīng)用程序崩潰了。這是我的代碼：時間偏好：import android.app.Dialog;import android.app.TimePickerDialog;import android.os.Bundle;import android.text.format.DateFormat;import androidx.annotation.NonNull;import androidx.fragment.app.DialogFragment;import java.util.Calendar;public class TimePreference extends DialogFragment {    @NonNull    @Override    public Dialog onCreateDialog(Bundle savedInstanceState) {        Calendar c = Calendar.getInstance();        int hour = c.get(Calendar.HOUR_OF_DAY);        int minute = c.get(Calendar.MINUTE);        return new TimePickerDialog(getActivity(), (TimePickerDialog.OnTimeSetListener) getActivity(), hour, minute, DateFormat.is24HourFormat(getActivity()));    }}設(shè)置片段：import android.os.Bundle;import androidx.fragment.app.DialogFragment;import androidx.preference.Preference;import androidx.preference.PreferenceFragmentCompat;import com.sstu.studentcalendar.R;import com.sstu.studentcalendar.Service.TimePreference;public class SettingsFragment extends PreferenceFragmentCompat{    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        addPreferencesFromResource(R.xml.prefs);        Preference preference = (Preference)getPreferenceManager().findPreference("timeset");        if (preference != null) {            preference.setOnPreferenceClickListener(new Preference.OnPreferenceClickListener() {                @Override                public boolean onPreferenceClick(Preference arg0) {                    DialogFragment timePicker = new TimePreference();                    timePicker.show(getFragmentManager(), "time picker");                    return true;                }            });        }    }    @Override    public void onCreatePreferences(Bundle savedInstanceState, String rootKey) {    }}我究竟做錯了什么？有什么簡單的方法可以從 PreferenceFragment 顯示時間選擇器嗎？