android：省市县三级联动（基于json和spring）

Posted 2020-06-17 gcczhongduan

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一、请看效果图“：

技术分享

二、程序的代码：

1、MainActivity.java

package com.loveplusplus.loader.demo.ui;

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemSelectedListener;
import android.widget.ArrayAdapter;
import android.widget.Spinner;
import android.widget.Toast;

import com.loveplusplus.loader.demo.R;
import com.loveplusplus.loader.demo.util.HttpService;

/**
* 省市县三级联动
*
* 2014年10月30日 15:22:04
*
* @author YJBo
*
*/
public class MainActivity extends Activity {
private static final String HOST_URL = "http://218.241.233.121/yqw";
private static final String PROVINCE_URL = "http://218.241.233.121/yqw/w/c/post?app=join&mdl=web&act=provinces&type=json";
private static final String CITY_URI = HOST_URL
+ "/w/c/post?

app=join&mdl=web&type=json&act=citys&col.province=";
private static final String COUNTY_URL = HOST_URL
+ "/w/c/post?

app=join&mdl=web&type=json&act=areas&col.city=";
// col.province
private Spinner provinceSpinner;
private Spinner citySpinner;
private Spinner countySpinner;
// 省市县数组
private String[] Province;
private String[] ProvinceCode;
private String json;
// 市---
private String json2;
private String[] City;
private String[] CityCode;
// 县
private String json3;
private String[] Country;
private String[] CountryCode;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// 获取省的名称
loadProvices();
}

private void loadProvices() {
new Thread(new Runnable() {
@Override
public void run() {
try {
// 初步进入页面。获取全部省份
json = HttpService.postParamAndFileOB(PROVINCE_URL);
mHandler.sendEmptyMessage(1);
} catch (Exception e) {
e.printStackTrace();
}
}
}).start();
}

// 市---新
private void loadCitys2(final String provinceCode) {
if (null == provinceCode)
return;
new Thread(new Runnable() {
@Override
public void run() {
try {
// 获取一个省的全部市
json2 = HttpService.postParamAndFileOB(CITY_URI
+ provinceCode);
mHandler.sendEmptyMessage(2);
} catch (Exception e) {
e.printStackTrace();
}
}
}).start();
}

// 县
private void loadCitys3(final String CountryCode) {
if (null == CityCode)
return;
new Thread(new Runnable() {
@Override
public void run() {
try {
// 获取县份数据
json3 = HttpService.postParamAndFileOB(COUNTY_URL
+ CountryCode);
mHandler.sendEmptyMessage(3);
System.out.println("------sheng----麻烦呢--33--");
} catch (Exception e) {
e.printStackTrace();
}
}
}).start();
}

Handler mHandler = new Handler() {
@Override
public void handleMessage(Message msg) {
switch (msg.what) {
case 1:
try {
JSONArray array = new JSONArray(json);
Province = new String[array.length()];
ProvinceCode = new String[array.length()];
for (int i = 0; i < array.length(); i++) {
JSONObject obj = (JSONObject) array.get(i);
Province[i] = obj.getString("name");
ProvinceCode[i] = obj.getString("code");
}
provinceSpinner = (Spinner) findViewById(R.id.spinner_province);
// 初始化下拉列表载入数据适配器
ArrayAdapter<String> adapter = new ArrayAdapter<String>(
MainActivity.this,
android.R.layout.simple_spinner_item, Province);
// 设置下拉列表的样式，下为设置为简单样式
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
// 将数据载入进下拉列表其中
provinceSpinner.setAdapter(adapter);
// 加入事件Spinner事件监听，当点击下拉列表中的某一选项之后触发该事件
provinceSpinner
.setOnItemSelectedListener(new SpinnerSelectedListener());
// 设置默认值
provinceSpinner.setVisibility(View.VISIBLE);
} catch (Exception e) {
e.printStackTrace();
}
break;
// 市
case 2:
try {
JSONArray array = new JSONArray(json2);
City = new String[array.length()];
CityCode = new String[array.length()];
for (int i = 0; i < array.length(); i++) {
JSONObject obj = (JSONObject) array.get(i);
City[i] = obj.getString("name");
CityCode[i] = obj.getString("code");
}
citySpinner = (Spinner) findViewById(R.id.spinner_city);
ArrayAdapter<String> adapter = new ArrayAdapter<String>(
MainActivity.this,
android.R.layout.simple_spinner_item, City);
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
citySpinner.setAdapter(adapter);
citySpinner.setOnItemSelectedListener(new SpinLisSHi());
citySpinner.setVisibility(View.VISIBLE);
} catch (JSONException e) {
e.printStackTrace();
}
break;
// 县
case 3:
try {
JSONArray array = new JSONArray(json3);
Country = new String[array.length()];
CountryCode = new String[array.length()];
for (int i = 0; i < array.length(); i++) {
JSONObject obj = (JSONObject) array.get(i);
Country[i] = obj.getString("name");
CountryCode[i] = obj.getString("code");
}
countySpinner = (Spinner) findViewById(R.id.spinner_county);
ArrayAdapter<String> adapter = new ArrayAdapter<String>(
MainActivity.this,
android.R.layout.simple_spinner_item, Country);
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
countySpinner.setAdapter(adapter);
countySpinner.setOnItemSelectedListener(new SpinLisXian());
countySpinner.setVisibility(View.VISIBLE);

} catch (JSONException e) {
e.printStackTrace();
}
break;

default:
break;
}
super.handleMessage(msg);
}
};

class SpinnerSelectedListener implements OnItemSelectedListener {

public void onItemSelected(AdapterView<?> arg0, View arg1, int arg2,
long arg3) {
Toast.makeText(MainActivity.this, Province[arg2], 3000).show();
// 下载市的名称
loadCitys2(ProvinceCode[arg2]);
}

public void onNothingSelected(AdapterView<?

> arg0) {
}
}

// 市
class SpinLisSHi implements OnItemSelectedListener {

public void onItemSelected(AdapterView<?

> arg0, View arg1, int arg2,
long arg3) {
Toast.makeText(MainActivity.this, City[arg2], 3000).show();
// 下载县的名称
loadCitys3(CityCode[arg2]);
}

public void onNothingSelected(AdapterView<?

> arg0) {
}
}

// 县
class SpinLisXian implements OnItemSelectedListener {

public void onItemSelected(AdapterView<?> arg0, View arg1, int arg2,
long arg3) {
Toast.makeText(MainActivity.this,
Country[arg2] + CountryCode[arg2], 3000).show();
}

public void onNothingSelected(AdapterView<?> arg0) {
}
}
}

2、httpService.java

package com.loveplusplus.loader.demo.util;

import java.util.ArrayList;
import java.util.List;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.HttpStatus;
import org.apache.http.NameValuePair;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.util.EntityUtils;

/**
* 2014年7月20日 16:26:40 这里是解析url的；
*
* @author YJBo
*/
public class HttpService {

public static void main(String[] args) {
}

public static String postParamAndFileOB(String url) {
// http地址
String httpUrl = url;
System.out.println("此时的OB地址httpUrl++==" + httpUrl);
System.out
.println("--------------数据库正在链接中····----------------------------");
try {
// HttpGet连接对象
HttpPost httpRequest = new HttpPost(httpUrl);
System.out.println("==wo走到这里了 20===");

System.out.println("==wo走到这里了 21===");
// 使用NameValuePair来保存要传递的Post參数
List<NameValuePair> params = new ArrayList<NameValuePair>();
// 设置字符集
HttpEntity httpentity = new UrlEncodedFormEntity(params, "UTF-8");
// 请求httpRequest
httpRequest.setEntity(httpentity);
// 取得HttpClient对象
HttpClient httpclient = new DefaultHttpClient();
// 请求HttpClient。取得HttpResponse
HttpResponse httpResponse = httpclient.execute(httpRequest);
System.out.println("==wo走到这里了 23===");
// 请求成功
if (httpResponse.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {
// 取得返回的字符串
System.out.println("==wo走到这里了 24===");
String strResultOB = EntityUtils.toString(httpResponse
.getEntity());
// .getEntity();
System.out.println("==wo走到这里了 22===" + strResultOB);
return strResultOB;
} else {
System.out.println("数据请求失败====");
}

} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return null;
}
}

3.activity_main.xml

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