Android使用NumberPicker控件实现选择城市，生日

本人菜鸟一枚，第一次写技术博客，有点小紧张，加上代码很乱，求不喷。

先放效果图：

 界面就这么简单。

然后放上代码：

package com.example.dialog;

import java.util.ArrayList;

import android.os.Bundle;
import android.app.Activity;
import android.app.AlertDialog;
import android.app.AlertDialog.Builder;
import android.app.Dialog;
import android.content.Context;
import android.content.DialogInterface;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.View;
import android.view.animation.Animation;
import android.view.animation.AnimationUtils;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.NumberPicker;
import android.widget.TextView;
import android.widget.Toast;
import android.widget.NumberPicker.OnValueChangeListener;

public class MainActivity extends Activity {
    public Context context = MainActivity.this;
    String msg = "test";
    // numberpicker1 简单的NumberPicker的操作
    private NumberPicker numberpicker1;

    // numberpicker2,numberpicker3是星座month和day
    private NumberPicker numberpicker2;
    private NumberPicker numberpicker3;
    private NumberPicker np;
    private TextView text;
    private TextView text1;
    private int num;
    int month =1;
    int day =1;
    String cityy;
    private String[] city= {"北京","上海","广州","深圳","成都","天津"};
    private Button bt1;
    private Button bt2;
    private Builder dialog;
    private Builder dialog2;
    private TextView tv1;
    private TextView tv2;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        bt1 =(Button) findViewById(R.id.bt1);
        tv1 = (TextView) findViewById(R.id.tv1);
        bt2 =(Button) findViewById(R.id.bt2);
        tv2 = (TextView) findViewById(R.id.tv2);
        bt1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View arg0) {
                dialog = createLoadingDialog(MainActivity.this, "test");
                dialog.create().show();
            }
        });
        bt2.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View arg0) {
                cityy ="北京";
                dialog2 = createLoadingDialog2(MainActivity.this, "test");
                dialog2.create().show();
            }
        });

    }

    /**
     * 得到自定义的progressDialog
     *
     * @param context
     * @param msg
     * @return
     */
    public Builder createLoadingDialog(Context context, String msg) {

        LayoutInflater inflater = LayoutInflater.from(context);
        View v = inflater.inflate(R.layout.loading_dialog, null);// 得到加载view

        numberpicker2 = (NumberPicker) v.findViewById(R.id.numberpicker2);
        numberpicker2.setMaxValue(12);
        numberpicker2.setMinValue(1);
        numberpicker2.setValue(month);
        numberpicker2.setFocusable(true);
        numberpicker2.setFocusableInTouchMode(true);
        numberpicker2.setOnValueChangedListener(monthChangedListener);

        /*
         * / setMaxValue根据每月的天数不一样，使用switch()进行分别判断
         */
        numberpicker3 = (NumberPicker) v.findViewById(R.id.numberpicker3);
        numberpicker3.setMinValue(1);
        numberpicker3.setMaxValue(31);
        numberpicker3.setValue(day);
        numberpicker3.setFocusable(true);
        numberpicker3.setFocusableInTouchMode(true);
        numberpicker3.setOnValueChangedListener(dayChangedListener);
        text1 = (TextView) v.findViewById(R.id.textxing);

        AlertDialog.Builder loadingDialog = new AlertDialog.Builder(context);
        loadingDialog.setMessage("生日");
        loadingDialog.setView(v);
        loadingDialog.setCancelable(false);// 不可以用“返回键”取消
        loadingDialog.setPositiveButton("确定",
                new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int whichButton) {
                        tv1.setText(month + "月" + day + "日" +"\t" + text1.getText().toString());
                    }
                });
        loadingDialog.setNegativeButton("取消",
                new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int whichButton) {
                    }
                });
        return loadingDialog;

    }

    public Builder createLoadingDialog2(Context context, String msg) {

        LayoutInflater inflater = LayoutInflater.from(context);
        View v = inflater.inflate(R.layout.loading_dialog2, null);// 得到加载view
        np = (NumberPicker) v.findViewById(R.id.numberpicker22);
        np.setDisplayedValues(city);
        np.setMinValue(0);
        np.setMaxValue(city.length - 1);
        np.setOnValueChangedListener(cityChangedListener);

        AlertDialog.Builder loadingDialog = new AlertDialog.Builder(context);
        loadingDialog.setMessage("城市");
        loadingDialog.setView(v);
        loadingDialog.setCancelable(false);// 不可以用“返回键”取消
        loadingDialog.setPositiveButton("确定",
                new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int whichButton) {
                        tv2.setText(cityy);
                    }
                });
        loadingDialog.setNegativeButton("取消",
                new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int whichButton) {
                        cityy = city[0];
                    }
                });
        return loadingDialog;

    }

    private NumberPicker.OnValueChangeListener monthChangedListener = new OnValueChangeListener() {

        @Override
        public void onValueChange(NumberPicker arg0, int arg1, int arg2) {
            // TODO Auto-generated method stub
            month = numberpicker2.getValue();
            xingzuo();
            switch (month) {
            case 1:
            case 3:
            case 5:
            case 7:
            case 8:
            case 10:
            case 12:
                numberpicker3.setMaxValue(31);
                break;
            case 2:
                numberpicker3.setMaxValue(29);
                break;
            case 4:
            case 6:
            case 9:
            case 11:
                numberpicker3.setMaxValue(30);
                break;

            default:
                break;
            }
        }

    };

    private NumberPicker.OnValueChangeListener dayChangedListener = new OnValueChangeListener() {

        @Override
        public void onValueChange(NumberPicker arg0, int arg1, int arg2) {
            // TODO Auto-generated method stub
            day = numberpicker3.getValue();
            xingzuo();
        }

    };
    private NumberPicker.OnValueChangeListener cityChangedListener = new OnValueChangeListener() {

        @Override
        public void onValueChange(NumberPicker arg0, int arg1, int arg2) {
            //获得城市名
            String [] a = np.getDisplayedValues();
            cityy = a[arg2];
        }

    };

    // 对获得的month 和 day 进行处理
    void xingzuo() {

        if ((month == 1 && day > 19) || (month == 2 && day < 19)) {
            text1.setText("水瓶座");
        } else if ((month == 2 && day > 18) || (month == 3 && day < 21)) {
            text1.setText("双鱼座");
        } else if ((month == 3 && day > 20) || (month == 4 && day < 20)) {
            text1.setText("白羊座");
        } else if ((month == 4 && day > 19) || (month == 5 && day < 21)) {
            text1.setText("金牛座");
        } else if ((month == 5 && day > 20) || (month == 6 && day < 22)) {
            text1.setText("双子座");
        } else if ((month == 6 && day > 21) || (month == 7 && day < 23)) {
            text1.setText("巨蟹座");
        } else if ((month == 7 && day > 22) || (month == 8 && day < 23)) {
            text1.setText("狮子座");
        } else if ((month == 8 && day > 22) || (month == 9 && day < 23)) {
            text1.setText("处女座");
        } else if ((month == 9 && day > 22) || (month == 10 && day < 24)) {
            text1.setText("天秤座");
        } else if ((month == 10 && day > 23) || (month == 11 && day < 23)) {
            text1.setText("天蝎座");
        } else if ((month == 11 && day > 22) || (month == 12 && day < 22)) {
            text1.setText("射手座");
        } else if ((month == 12 && day > 21) || (month == 1 && day < 20)) {
            text1.setText("摩羯座");
        }

    }
}

代码很简单，主要是把NumberPicker跟数据绑定在一起，就不多解释了。还有布局太简单，也不用贴出来了吧。大体就这样