Dialog+NumberPicker

package com.gtercn.myapplication;

import android.app.Activity;
import android.content.DialogInterface;
import android.os.Bundle;
import android.support.v7.app.AlertDialog;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.Button;
import android.widget.DatePicker;
import android.widget.EditText;
import android.widget.NumberPicker;
import android.widget.TextView;
import android.widget.Toast;

import java.text.SimpleDateFormat;
import java.util.Calendar;

public class MainActivity extends Activity {
    private Button mButton;
    private NumberPicker mCityPicker;
    private NumberPicker mCityPicker2;
    private NumberPicker mCityPicker3;
    private final static String[] CITYS = {"2004", "2006", "2003", "2002", "2001", "2016"};
    private final static String[] date = {"5", "6", "7", "8", "9", "10"};
    private final static String[] monteh = {"12", "11", "10", "9", "8", "7"};
    private int mSeletedIndex;
    private int mSeletedIndex2;
    private int mSeletedIndex3;
    String txt1;
    String txt2;
    String txt3;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_light);
        mButton = (Button) findViewById(R.id.button);
        mButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                AlertDialog.Builder builder7 = new AlertDialog.Builder(
                        MainActivity.this);
                builder7.setTitle("标题");
                builder7.setIcon(R.mipmap.ic_launcher);
                View view = LayoutInflater.from(MainActivity.this).inflate(
                        R.layout.activity_main, null);
                mCityPicker = (NumberPicker) view.findViewById(R.id.city_picker);
                mCityPicker2 = (NumberPicker) view.findViewById(R.id.city_picker2);
                mCityPicker3 = (NumberPicker) view.findViewById(R.id.city_picker3);
                //设置数据源
                mCityPicker.setDisplayedValues(CITYS);
                //设置数据长度
                mCityPicker.setMinValue(0);
                mCityPicker.setMaxValue(CITYS.length - 1);
                mCityPicker.setValue(4);
                //设置监听
                mCityPicker.setOnValueChangedListener(new NumberPicker.OnValueChangeListener() {
                    @Override
                    public void onValueChange(NumberPicker picker, int oldVal, int newVal) {
                        mSeletedIndex = newVal;
                    }
                });
                mCityPicker.setOnScrollListener(new NumberPicker.OnScrollListener() {
                    @Override
                    public void onScrollStateChange(NumberPicker view, int scrollState) {
                        switch (scrollState) {
                            case NumberPicker.OnScrollListener.SCROLL_STATE_FLING:
                                Log.e("TAG", "SCROLL_STATE_FLING");
                                //惯性滑动
                                break;
                            case NumberPicker.OnScrollListener.SCROLL_STATE_TOUCH_SCROLL:
                                //手动滑动
                                Log.e("TAG", "SCROLL_STATE_TOUCH_SCROLL");
                                break;
                            case NumberPicker.OnScrollListener.SCROLL_STATE_IDLE:
                                //停止滑动
                                Log.e("TAG", "SCROLL_STATE_IDLE");
                                txt1 = CITYS[mSeletedIndex].toString();
                                //mTextView.setText(CITYS[mSeletedIndex]);

                                //Toast.makeText(MainActivity.this, CITYS[mSeletedIndex], Toast.LENGTH_SHORT).show();
                                break;
                        }

                    }
                });
                //设置数据源
                mCityPicker2.setDisplayedValues(monteh);
                //设置数据长度
                mCityPicker2.setMinValue(0);
                mCityPicker2.setMaxValue(monteh.length - 1);
                mCityPicker2.setValue(4);
                //设置监听
                mCityPicker2.setOnValueChangedListener(new NumberPicker.OnValueChangeListener() {
                    @Override
                    public void onValueChange(NumberPicker picker, int oldVal, int newVal) {
                        mSeletedIndex2 = newVal;
                    }
                });
                mCityPicker2.setOnScrollListener(new NumberPicker.OnScrollListener() {
                    @Override
                    public void onScrollStateChange(NumberPicker view, int scrollState) {
                        switch (scrollState) {
                            case NumberPicker.OnScrollListener.SCROLL_STATE_FLING:
                                Log.e("TAG", "SCROLL_STATE_FLING");
                                //惯性滑动
                                break;
                            case NumberPicker.OnScrollListener.SCROLL_STATE_TOUCH_SCROLL:
                                //手动滑动
                                Log.e("TAG", "SCROLL_STATE_TOUCH_SCROLL");
                                break;
                            case NumberPicker.OnScrollListener.SCROLL_STATE_IDLE:
                                //停止滑动
                                Log.e("TAG", "SCROLL_STATE_IDLE");
                                txt2 = monteh[mSeletedIndex2];
                                break;
                        }

                    }
                });
                //设置数据源
                mCityPicker3.setDisplayedValues(date);
                //设置数据长度
                mCityPicker3.setMinValue(0);
                mCityPicker3.setMaxValue(date.length - 1);
                mCityPicker3.setValue(4);
                //设置监听
                mCityPicker3.setOnValueChangedListener(new NumberPicker.OnValueChangeListener() {
                    @Override
                    public void onValueChange(NumberPicker picker, int oldVal, int newVal) {
                        mSeletedIndex3 = newVal;
                    }
                });
                mCityPicker3.setOnScrollListener(new NumberPicker.OnScrollListener() {
                    @Override
                    public void onScrollStateChange(NumberPicker view, int scrollState) {
                        switch (scrollState) {
                            case NumberPicker.OnScrollListener.SCROLL_STATE_FLING:
                                Log.e("TAG", "SCROLL_STATE_FLING");
                                //惯性滑动
                                break;
                            case NumberPicker.OnScrollListener.SCROLL_STATE_TOUCH_SCROLL:
                                //手动滑动
                                Log.e("TAG", "SCROLL_STATE_TOUCH_SCROLL");
                                break;
                            case NumberPicker.OnScrollListener.SCROLL_STATE_IDLE:
                                //停止滑动
                                Log.e("TAG", "SCROLL_STATE_IDLE");
                                txt3 = date[mSeletedIndex3];
                                break;
                        }

                    }
                });
                builder7.setView(view);
                builder7.setPositiveButton("确定",
                        new android.content.DialogInterface.OnClickListener() {
                            @Override
                            public void onClick(DialogInterface dialog, int which) {
                                // TODO Auto-generated method stub
                                Toast.makeText(
                                        MainActivity.this,
                                        txt1 + txt2 + txt3, Toast.LENGTH_LONG)
                                        .show();
                            }
                        });
                builder7.setNegativeButton("取消",
                        new android.content.DialogInterface.OnClickListener() {

                            @Override
                            public void onClick(DialogInterface dialog, int which) {
                                // TODO Auto-generated method stub

                            }
                        });
                builder7.create();
                builder7.show();
            }
        });
    }
}

 布局文件

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"

  >
<LinearLayout
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:orientation="horizontal">
    <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true"
        android:orientation="horizontal"
        android:gravity="center_vertical">

        <NumberPicker
            android:id="@+id/city_picker"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"></NumberPicker>

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="年"
            android:layout_marginLeft="10dp"/>
    </LinearLayout>
    <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true"
        android:orientation="horizontal"
        android:gravity="center_vertical">

        <NumberPicker
            android:id="@+id/city_picker2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"></NumberPicker>

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="月"
            android:layout_marginLeft="10dp"/>
    </LinearLayout>
    <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true"
        android:orientation="horizontal"
        android:gravity="center_vertical">

        <NumberPicker
            android:id="@+id/city_picker3"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"></NumberPicker>

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="日"
            android:layout_marginLeft="10dp"/>
    </LinearLayout>
</LinearLayout>
 
</RelativeLayout>

先附上效果图片