您不需要类继承在所有acheive在你的问题的问题。

You don't need class inheritance at all to acheive the problem in your question.

我能一起抛出此工作的例子，既复位采摘为当前日期。

I was able to throw this working example together that resets both pickers to the current date.

MainActivity

public class MainActivity extends Activity {

    private Button resetButton;
    private DatePicker datePicker;
    private TimePicker timePicker;

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

        resetButton = (Button) findViewById(R.id.btn_reset);
        datePicker = (DatePicker) findViewById(R.id.datePicker);
        timePicker = (TimePicker) findViewById(R.id.timePicker);

        resetButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Calendar c = Calendar.getInstance();

                int year = c.get(Calendar.YEAR);
                int month = c.get(Calendar.MONTH);
                int day = c.get(Calendar.DAY_OF_MONTH);

                datePicker.init(year, month, day, null);

                int hour = c.get(Calendar.HOUR_OF_DAY);
                int minute = c.get(Calendar.MINUTE);

                timePicker.setCurrentHour(hour);
                timePicker.setCurrentMinute(minute);
            }
        });

    }
}

activity_main.xml中

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
              android:layout_width="match_parent"
              android:layout_height="match_parent"
              android:orientation="vertical">

    <Button
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="Reset"
            android:id="@+id/btn_reset"/>
    <DatePicker
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:id="@+id/datePicker" 
            android:layout_gravity="center_horizontal"/>
    <TimePicker
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="center_horizontal"
            android:id="@+id/timePicker"/>
</LinearLayout>

或者，如果你想方法来设置日期和时间，你可以做到这一点。

Or if you want methods to set the date and time, you can do this

resetButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Calendar c = Calendar.getInstance();
                setDate(c);
                setTime(c);
            }
        });


} // end onCreate

private void setDate(Calendar c) {
    int year = c.get(Calendar.YEAR);
    int month = c.get(Calendar.MONTH);
    int day = c.get(Calendar.DAY_OF_MONTH);

    datePicker.init(year, month, day, null);
}

private void setTime(Calendar c) {
    int hour = c.get(Calendar.HOUR_OF_DAY);
    int minute = c.get(Calendar.MINUTE);

    timePicker.setCurrentHour(hour);
    timePicker.setCurrentMinute(minute);
}