java - DialogFragment timepicker onCancel和onDismiss问题

我试图实现一个由SwitchCompat打开的时间选择器，所以当我启用该选项时，时间选择器会显示出来，可以正常工作，但是如果我按“取消”或“后退”按钮，或者只是按时间选择器之外，开关保持在“开”位置，并且当我没有在“时间选择器”中选择时间时，我希望它回到“关”。以为onCancel方法可能会有所帮助，但没有效果，或者我在实现它时犯了一些错误，有相关的代码：

public class Settings extends AppCompatActivity implements TimePickerDialog.OnTimeSetListener, TimePickerDialog.OnDismissListener, TimePickerDialog.OnCancelListener {
    private EditText textLastHour;
    private KeyListener keyListener;
    private SwitchCompat hourSwitch;

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

        textLastHour = findViewById(R.id.finalHourText);
        textLastHour.setKeyListener(null);
        textLastHour.setHint("Option not selected");

        hourSwitch = findViewById(R.id.switch_hour);

        hourSwitch.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                if (isChecked) {
                    DialogFragment timePicker = new TimePickerFragment();
                    timePicker.show(getSupportFragmentManager(), "time picker");

                } else {
                    textLastHour.setText("");
                }
            }
        });
    }


    @Override
    public void onTimeSet(TimePicker view, int hourOfDay, int minute) {
        textLastHour = findViewById(R.id.finalHourText);
        textLastHour.setText("Final alarm at: " + hourOfDay + ":" + minute);
    }

    @Override
    public void onCancel(DialogInterface dialog) {
        hourSwitch.setChecked(false);
    }

    @Override
    public void onDismiss(DialogInterface dialog) {
        hourSwitch.setChecked(false);
    }
}

我已经尝试了onDismiss和onCancel，但都没有在这里工作，如果您取消了时间选择器，是否有任何解决方案可以使Switch返回原始位置？我在标签中添加了DatePicker，因为我认为它可以与TimePicker相同的解决方案。

我的TimePickerFragment课：

public class TimePickerFragment 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()));
    }
}

最佳答案

它实际上比我想的简单，您只需要添加一个解雇侦听器并相应地更改您的ui / logic

TimePickerDialog dialog = new TimePickerDialog(this, new TimePickerDialog.OnTimeSetListener() {
    @Override
    public void onTimeSet(TimePicker view, int hourOfDay, int minute) {

    }
}, 10, 10, true);

dialog.setOnCancelListener(new DialogInterface.OnCancelListener() {
    @Override
    public void onCancel(DialogInterface dialog) {
        Toast.makeText(MainActivity.this, "dismissed", Toast.LENGTH_LONG).show();
    }
});

dialog.show();

您可以使用标准的TimePickerDialog

编辑：将除onCreate()之外的所有内容放入dialog.show()，dialog.show()进入Switch中的ifChecked