<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    xmlns:tools="http://schemas.android.com/tools"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:descendantFocusability="blocksDescendants"

    android:orientation="vertical"

    tools:context="com.example.googlenumberpicker.MainActivity" >

    <LinearLayout

        android:layout_width="match_parent"

        android:layout_height="match_parent"

        android:orientation="horizontal" >

        <LinearLayout

            android:layout_width="match_parent"

            android:layout_height="match_parent"

            android:layout_weight="1"

            android:orientation="vertical" >

            <NumberPicker

                android:id="@+id/np_date"

                android:layout_width="match_parent"

                android:layout_height="wrap_content" />

        </LinearLayout>

        <LinearLayout

            android:layout_width="match_parent"

            android:layout_height="match_parent"

            android:layout_weight="1"

            android:orientation="vertical" >

            <LinearLayout

                android:layout_width="match_parent"

                android:layout_height="match_parent"

                android:orientation="horizontal" >

                <NumberPicker

                    android:id="@+id/np_hour"

                    android:layout_width="match_parent"

                    android:layout_height="wrap_content"

                    android:layout_weight="1" />

                <NumberPicker

                    android:id="@+id/np_minute"

                    android:layout_width="match_parent"

                    android:layout_height="wrap_content"

                    android:layout_weight="1" >

                </NumberPicker>

            </LinearLayout>

        </LinearLayout>

    </LinearLayout>

</LinearLayout>

import java.util.Calendar;

import android.app.Activity;

import android.os.Bundle;

import android.widget.NumberPicker;

import android.widget.NumberPicker.Formatter;

import android.widget.NumberPicker.OnScrollListener;

import android.widget.NumberPicker.OnValueChangeListener;

public class MainActivity extends Activity implements OnValueChangeListener, OnScrollListener, Formatter

{

    int year;

    int month;

    int day;

    int hour;

    int minute;

    String[] dates;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        Calendar c = Calendar.getInstance();

        year = c.get(Calendar.YEAR);

        month = c.get(Calendar.MONTH);

        day = c.get(Calendar.DAY_OF_MONTH);

        hour = c.get(Calendar.HOUR);

        minute = c.get(Calendar.MINUTE);

        this.initDates();

        this.init();

    }

    private void initDates() {

        Calendar c = Calendar.getInstance();

        c.setFirstDayOfWeek(Calendar.SUNDAY);

        c.set(year, 0, 1);

        dates = new String[c.getActualMaximum(Calendar.DAY_OF_YEAR)];

        for (int i = 0; i < dates.length; i++) {

            dates[i] = this.format((c.get(Calendar.MONTH)+1)) + "-" + this.format(c.get(Calendar.DAY_OF_MONTH));

            c.roll(Calendar.DAY_OF_YEAR, true);

        }

    }

    private void init() {

        NumberPicker np_date = (NumberPicker) this.findViewById(R.id.np_date);

        NumberPicker np_hour = (NumberPicker) this.findViewById(R.id.np_hour);

        NumberPicker np_minute = (NumberPicker) this.findViewById(R.id.np_minute);

        np_date.setFormatter(this);

        np_date.setOnScrollListener(this);

        np_date.setOnValueChangedListener(this);

        np_date.setDisplayedValues(dates);

        np_date.setMaxValue(dates.length - 1);

        np_date.setValue(Calendar.getInstance().get(Calendar.DAY_OF_YEAR)-1);

        np_hour.setFormatter(this);

        np_hour.setOnScrollListener(this);

        np_hour.setOnValueChangedListener(this);

        np_hour.setMaxValue(23);

        np_hour.setMinValue(0);

        np_hour.setValue(hour);

        np_minute.setFormatter(this);

        np_minute.setOnScrollListener(this);

        np_minute.setOnValueChangedListener(this);

        np_minute.setMaxValue(59);

        np_minute.setMinValue(0);

        np_minute.setValue(minute);

    }

    @Override

    public String format(int value) {

        String tmpStr = String .valueOf(value);

        if (value < 10) {

            tmpStr = "0" + tmpStr;

        }

        return tmpStr;

    }

    @Override

    public void onValueChange(NumberPicker picker, int oldVal, int newVal) {

//        Toast.makeText(MainActivity.this, oldVal + "变成" + newVal , 0).show();

    }

    @Override

    public void onScrollStateChange(NumberPicker view, int scrollState) {

        /*switch (scrollState) {

        case OnScrollListener.SCROLL_STATE_FLING:

            Toast.makeText(MainActivity.this, "后续滑动..." , 0).show();

            break;

        case OnScrollListener.SCROLL_STATE_IDLE:

            Toast.makeText(MainActivity.this, "不滑动" , 0).show();

            break;

        case OnScrollListener.SCROLL_STATE_TOUCH_SCROLL:

            Toast.makeText(MainActivity.this, "滑动中" , 0).show();

            break;

        default:

            break;

        }*/

    }

}