Android实现城市选择三级联动

本文实例为大家分享了android实现城市选择三级联动的具体代码，供大家参考，具体内容如下

效果图，用于城市选择三级联动，带id返回

1. 添加依赖 

//三级联动
 implementation 'com.contrarywind:android-pickerview:4.1.8'
 // gosn解析
 implementation 'com.google.code.gson:gson:2.8.5'

2.文件转换成json串工具类

import android.content.context;
import android.content.res.assetmanager;
 
import java.io.bufferedinputstream;
import java.io.bytearrayoutputstream;
import java.io.ioexception;
import java.io.inputstream;
 
/**
 * created by dell on 2019/9/16.
 */
 
public class jsonfilereader {
 public static string getjson(context context, string filename) {
 bytearrayoutputstream baos = new bytearrayoutputstream();
 try {
  assetmanager assetmanager = context.getassets();
  inputstream inputstream = assetmanager.open(filename);
  bufferedinputstream bufferedinputstream = new bufferedinputstream(inputstream);
  byte[] buffer = new byte[1024];
  int len;
  while ((len = bufferedinputstream.read(buffer)) != -1) {
  baos.write(buffer, 0, len);
  }
 } catch (ioexception e) {
  e.printstacktrace();
 }
 return baos.tostring();
 }
}

3.json转换成集合工具类

import android.content.context;
 
import com.google.gson.gson;
 
import org.json.jsonarray;
 
import java.util.arraylist;
 
/**
 * created by dell on 2019/9/16.
 */
 
public class levelslistdate {
 private arraylist<jsonbean> options1items = new arraylist<>();
 private arraylist<arraylist<string>> options2items = new arraylist<>();
 private arraylist<arraylist<arraylist<string>>> options3items = new arraylist<>();
 private context context;
 
 public levelslistdate(context context) {
 this.context = context;
 }
 
 public arraylist<jsonbean> initjsondata(string path) {
 string jsondata = jsonfilereader.getjson(context, path);
 options1items.clear();
 options1items = parsedata(jsondata);//用gson 转成实体
 return options1items;
 }
 
 public arraylist<arraylist<string>> initjsondata1(string path) {
 string jsondata = jsonfilereader.getjson(context, path);
 arraylist<jsonbean> jsonbean = parsedata(jsondata);//用gson 转成实体
 options2items.clear();
 for (int i = 0; i < jsonbean.size(); i++) {//遍历省份
  arraylist<string> citylist = new arraylist<>();//该省的城市列表（第二级）
  arraylist<arraylist<string>> province_arealist = new arraylist<>();//该省的所有地区列表（第三极）
  for (int c = 0; c < jsonbean.get(i).getcity().size(); c++) {//遍历该省份的所有城市
  string cityname = jsonbean.get(i).getcity().get(c).getregion_name();
  citylist.add(cityname);//添加城市
  arraylist<string> city_arealist = new arraylist<>();//该城市的所有地区列表
  //如果无地区数据，建议添加空字符串，防止数据为null 导致三个选项长度不匹配造成崩溃
  if (jsonbean.get(i).getcity().get(c).getres() == null
   || jsonbean.get(i).getcity().get(c).getres().size() == 0) {
   city_arealist.add("");
  } else {
   for (int d = 0; d < jsonbean.get(i).getcity().get(c).getres().size(); d++) {//该城市对应地区所有数据
   string areaname = jsonbean.get(i).getcity().get(c).getres().get(d).getregion_name();
   city_arealist.add(areaname);//添加该城市所有地区数据
   }
  }
  province_arealist.add(city_arealist);//添加该省所有地区数据
  }
  /**
  * 添加城市数据
  */
  options2items.add(citylist);
 }
 return options2items;
 }
 
 public arraylist<arraylist<arraylist<string>>> initjsondata2(string path) {
 string jsondata = jsonfilereader.getjson(context, path);
 arraylist<jsonbean> jsonbean = parsedata(jsondata);//用gson 转成实体
 options3items.clear();
 for (int i = 0; i < jsonbean.size(); i++) {//遍历省份
  arraylist<string> citylist = new arraylist<>();//该省的城市列表（第二级）
  arraylist<arraylist<string>> province_arealist = new arraylist<>();//该省的所有地区列表（第三极）
  for (int c = 0; c < jsonbean.get(i).getcity().size(); c++) {//遍历该省份的所有城市
  string cityname = jsonbean.get(i).getcity().get(c).getregion_name();
  citylist.add(cityname);//添加城市
  arraylist<string> city_arealist = new arraylist<>();//该城市的所有地区列表
  //如果无地区数据，建议添加空字符串，防止数据为null 导致三个选项长度不匹配造成崩溃
  if (jsonbean.get(i).getcity().get(c).getres() == null
   || jsonbean.get(i).getcity().get(c).getres().size() == 0) {
   city_arealist.add("");
  } else {
   for (int d = 0; d < jsonbean.get(i).getcity().get(c).getres().size(); d++) {//该城市对应地区所有数据
   string areaname = jsonbean.get(i).getcity().get(c).getres().get(d).getregion_name();
   city_arealist.add(areaname);//添加该城市所有地区数据
   }
  }
  province_arealist.add(city_arealist);//添加该省所有地区数据
  }
  /**
  * 添加地区数据
  */
  options3items.add(province_arealist);
 }
 return options3items;
 }
 
 public arraylist<jsonbean> parsedata(string result) {//gson 解析
 arraylist<jsonbean> detail = new arraylist<>();
 try {
  jsonarray data = new jsonarray(result);
  gson gson = new gson();
  for (int i = 0; i < data.length(); i++) {
  jsonbean entity = gson.fromjson(data.optjsonobject(i).tostring(), jsonbean.class);
  detail.add(entity);
  }
 } catch (exception e) {
  e.printstacktrace();
 }
 return detail;
 }
}

4.jsonbean类

import com.contrarywind.interfaces.ipickerviewdata;
 
import java.util.list;
 
/**
 * created by dell on 2019/9/16.
 */
 
public class jsonbean implements ipickerviewdata {
 
 /**
 * id : 7971
 * parent_id : 7459
 * region_name : 辽宁省
 * city : [{"id":7972,"parent_id":7971,"region_name":"沈阳市","res":[{"id":7973,"parent_id":7972,"region_name":"和平区"},{"id":7974,"parent_id":7972,"region_name":"沈河区"},{"id":7975,"parent_id":7972,"region_name":"大东区"},{"id":7976,"parent_id":7972,"region_name":"皇姑区"},{"id":7977,"parent_id":7972,"region_name":"铁西区"},{"id":7978,"parent_id":7972,"region_name":"苏家屯区"},{"id":7979,"parent_id":7972,"region_name":"东陵区"},{"id":7980,"parent_id":7972,"region_name":"新城子区"},{"id":7981,"parent_id":7972,"region_name":"于洪区"},{"id":7982,"parent_id":7972,"region_name":"辽中县"},{"id":7983,"parent_id":7972,"region_name":"康平县"},{"id":7984,"parent_id":7972,"region_name":"法库县"},{"id":7985,"parent_id":7972,"region_name":"新民市"},{"id":7986,"parent_id":7972,"region_name":"浑南新区"},{"id":7987,"parent_id":7972,"region_name":"张士开发区"},{"id":7988,"parent_id":7972,"region_name":"沈北新区"},{"id":7989,"parent_id":7972,"region_name":"其它区"}]},{"id":7990,"parent_id":7971,"region_name":"大连市","res":[{"id":7991,"parent_id":7990,"region_name":"中山区"},{"id":7992,"parent_id":7990,"region_name":"西岗区"},{"id":7993,"parent_id":7990,"region_name":"沙河口区"},{"id":7994,"parent_id":7990,"region_name":"甘井子区"},{"id":7995,"parent_id":7990,"region_name":"旅顺口区"},{"id":7996,"parent_id":7990,"region_name":"金州区"},{"id":7997,"parent_id":7990,"region_name":"长海县"},{"id":7998,"parent_id":7990,"region_name":"开发区"},{"id":7999,"parent_id":7990,"region_name":"瓦房店市"},{"id":8000,"parent_id":7990,"region_name":"普兰店市"},{"id":8001,"parent_id":7990,"region_name":"庄河市"},{"id":8002,"parent_id":7990,"region_name":"岭前区"},{"id":8003,"parent_id":7990,"region_name":"其它区"}]},{"id":8004,"parent_id":7971,"region_name":"鞍山市","res":[{"id":8005,"parent_id":8004,"region_name":"铁东区"},{"id":8006,"parent_id":8004,"region_name":"铁西区"},{"id":8007,"parent_id":8004,"region_name":"立山区"},{"id":8008,"parent_id":8004,"region_name":"千山区"},{"id":8009,"parent_id":8004,"region_name":"台安县"},{"id":8010,"parent_id":8004,"region_name":"岫岩满族自治县"},{"id":8011,"parent_id":8004,"region_name":"高新区"},{"id":8012,"parent_id":8004,"region_name":"海城市"},{"id":8013,"parent_id":8004,"region_name":"其它区"}]},{"id":8014,"parent_id":7971,"region_name":"抚顺市","res":[{"id":8015,"parent_id":8014,"region_name":"新抚区"},{"id":8016,"parent_id":8014,"region_name":"东洲区"},{"id":8017,"parent_id":8014,"region_name":"望花区"},{"id":8018,"parent_id":8014,"region_name":"顺城区"},{"id":8019,"parent_id":8014,"region_name":"抚顺县"},{"id":8020,"parent_id":8014,"region_name":"新宾满族自治县"},{"id":8021,"parent_id":8014,"region_name":"清原满族自治县"},{"id":8022,"parent_id":8014,"region_name":"其它区"}]},{"id":8023,"parent_id":7971,"region_name":"本溪市","res":[{"id":8024,"parent_id":8023,"region_name":"平山区"},{"id":8025,"parent_id":8023,"region_name":"溪湖区"},{"id":8026,"parent_id":8023,"region_name":"明山区"},{"id":8027,"parent_id":8023,"region_name":"南芬区"},{"id":8028,"parent_id":8023,"region_name":"本溪满族自治县"},{"id":8029,"parent_id":8023,"region_name":"桓仁满族自治县"},{"id":8030,"parent_id":8023,"region_name":"其它区"}]},{"id":8031,"parent_id":7971,"region_name":"丹东市","res":[{"id":8032,"parent_id":8031,"region_name":"元宝区"},{"id":8033,"parent_id":8031,"region_name":"振兴区"},{"id":8034,"parent_id":8031,"region_name":"振安区"},{"id":8035,"parent_id":8031,"region_name":"宽甸满族自治县"},{"id":8036,"parent_id":8031,"region_name":"东港市"},{"id":8037,"parent_id":8031,"region_name":"凤城市"},{"id":8038,"parent_id":8031,"region_name":"其它区"}]},{"id":8039,"parent_id":7971,"region_name":"锦州市","res":[{"id":8040,"parent_id":8039,"region_name":"古塔区"},{"id":8041,"parent_id":8039,"region_name":"凌河区"},{"id":8042,"parent_id":8039,"region_name":"太和区"},{"id":8043,"parent_id":8039,"region_name":"黑山县"},{"id":8044,"parent_id":8039,"region_name":"义县"},{"id":8045,"parent_id":8039,"region_name":"凌海市"},{"id":8046,"parent_id":8039,"region_name":"北镇市"},{"id":8047,"parent_id":8039,"region_name":"其它区"}]},{"id":8048,"parent_id":7971,"region_name":"营口市","res":[{"id":8049,"parent_id":8048,"region_name":"站前区"},{"id":8050,"parent_id":8048,"region_name":"西市区"},{"id":8051,"parent_id":8048,"region_name":"鲅鱼圈区"},{"id":8052,"parent_id":8048,"region_name":"老边区"},{"id":8053,"parent_id":8048,"region_name":"盖州市"},{"id":8054,"parent_id":8048,"region_name":"大石桥市"},{"id":8055,"parent_id":8048,"region_name":"其它区"}]},{"id":8056,"parent_id":7971,"region_name":"阜新市","res":[{"id":8057,"parent_id":8056,"region_name":"海州区"},{"id":8058,"parent_id":8056,"region_name":"新邱区"},{"id":8059,"parent_id":8056,"region_name":"太平区"},{"id":8060,"parent_id":8056,"region_name":"清河门区"},{"id":8061,"parent_id":8056,"region_name":"细河区"},{"id":8062,"parent_id":8056,"region_name":"阜新蒙古族自治县"},{"id":8063,"parent_id":8056,"region_name":"彰武县"},{"id":8064,"parent_id":8056,"region_name":"其它区"}]},{"id":8065,"parent_id":7971,"region_name":"辽阳市","res":[{"id":8066,"parent_id":8065,"region_name":"白塔区"},{"id":8067,"parent_id":8065,"region_name":"文圣区"},{"id":8068,"parent_id":8065,"region_name":"宏伟区"},{"id":8069,"parent_id":8065,"region_name":"弓长岭区"},{"id":8070,"parent_id":8065,"region_name":"太子河区"},{"id":8071,"parent_id":8065,"region_name":"辽阳县"},{"id":8072,"parent_id":8065,"region_name":"灯塔市"},{"id":8073,"parent_id":8065,"region_name":"其它区"}]},{"id":8074,"parent_id":7971,"region_name":"盘锦市","res":[{"id":8075,"parent_id":8074,"region_name":"双台子区"},{"id":8076,"parent_id":8074,"region_name":"兴隆台区"},{"id":8077,"parent_id":8074,"region_name":"大洼县"},{"id":8078,"parent_id":8074,"region_name":"盘山县"},{"id":8079,"parent_id":8074,"region_name":"其它区"}]},{"id":8080,"parent_id":7971,"region_name":"铁岭市","res":[{"id":8081,"parent_id":8080,"region_name":"银州区"},{"id":8082,"parent_id":8080,"region_name":"清河区"},{"id":8083,"parent_id":8080,"region_name":"铁岭县"},{"id":8084,"parent_id":8080,"region_name":"西丰县"},{"id":8085,"parent_id":8080,"region_name":"昌图县"},{"id":8086,"parent_id":8080,"region_name":"调兵山市"},{"id":8087,"parent_id":8080,"region_name":"开原市"},{"id":8088,"parent_id":8080,"region_name":"其它区"}]},{"id":8089,"parent_id":7971,"region_name":"朝阳市","res":[{"id":8090,"parent_id":8089,"region_name":"双塔区"},{"id":8091,"parent_id":8089,"region_name":"龙城区"},{"id":8092,"parent_id":8089,"region_name":"朝阳县"},{"id":8093,"parent_id":8089,"region_name":"建平县"},{"id":8094,"parent_id":8089,"region_name":"喀喇沁左翼蒙古族自治县"},{"id":8095,"parent_id":8089,"region_name":"北票市"},{"id":8096,"parent_id":8089,"region_name":"凌源市"},{"id":8097,"parent_id":8089,"region_name":"其它区"}]},{"id":8098,"parent_id":7971,"region_name":"葫芦岛市","res":[{"id":8099,"parent_id":8098,"region_name":"连山区"},{"id":8100,"parent_id":8098,"region_name":"龙港区"},{"id":8101,"parent_id":8098,"region_name":"南票区"},{"id":8102,"parent_id":8098,"region_name":"绥中县"},{"id":8103,"parent_id":8098,"region_name":"建昌县"},{"id":8104,"parent_id":8098,"region_name":"兴城市"},{"id":8105,"parent_id":8098,"region_name":"其它区"}]}]
 */
 
 private int id;
 private int parent_id;
 private string region_name;
 private list<citybean> city;
 
 public int getid() {
 return id;
 }
 
 public void setid(int id) {
 this.id = id;
 }
 
 public int getparent_id() {
 return parent_id;
 }
 
 public void setparent_id(int parent_id) {
 this.parent_id = parent_id;
 }
 
 public string getregion_name() {
 return region_name;
 }
 
 public void setregion_name(string region_name) {
 this.region_name = region_name;
 }
 
 public list<citybean> getcity() {
 return city;
 }
 
 public void setcity(list<citybean> city) {
 this.city = city;
 }
 
 @override
 public string getpickerviewtext() {
 return this.region_name;
 }
 
 public static class citybean {
 /**
  * id : 7972
  * parent_id : 7971
  * region_name : 沈阳市
  * res : [{"id":7973,"parent_id":7972,"region_name":"和平区"},{"id":7974,"parent_id":7972,"region_name":"沈河区"},{"id":7975,"parent_id":7972,"region_name":"大东区"},{"id":7976,"parent_id":7972,"region_name":"皇姑区"},{"id":7977,"parent_id":7972,"region_name":"铁西区"},{"id":7978,"parent_id":7972,"region_name":"苏家屯区"},{"id":7979,"parent_id":7972,"region_name":"东陵区"},{"id":7980,"parent_id":7972,"region_name":"新城子区"},{"id":7981,"parent_id":7972,"region_name":"于洪区"},{"id":7982,"parent_id":7972,"region_name":"辽中县"},{"id":7983,"parent_id":7972,"region_name":"康平县"},{"id":7984,"parent_id":7972,"region_name":"法库县"},{"id":7985,"parent_id":7972,"region_name":"新民市"},{"id":7986,"parent_id":7972,"region_name":"浑南新区"},{"id":7987,"parent_id":7972,"region_name":"张士开发区"},{"id":7988,"parent_id":7972,"region_name":"沈北新区"},{"id":7989,"parent_id":7972,"region_name":"其它区"}]
  */
 
 private int id;
 private int parent_id;
 private string region_name;
 private list<resbean> res;
 
 public int getid() {
  return id;
 }
 
 public void setid(int id) {
  this.id = id;
 }
 
 public int getparent_id() {
  return parent_id;
 }
 
 public void setparent_id(int parent_id) {
  this.parent_id = parent_id;
 }
 
 public string getregion_name() {
  return region_name;
 }
 
 public void setregion_name(string region_name) {
  this.region_name = region_name;
 }
 
 public list<resbean> getres() {
  return res;
 }
 
 public void setres(list<resbean> res) {
  this.res = res;
 }
 
 public static class resbean {
  /**
  * id : 7973
  * parent_id : 7972
  * region_name : 和平区
  */
 
  private int id;
  private int parent_id;
  private string region_name;
 
  public int getid() {
  return id;
  }
 
  public void setid(int id) {
  this.id = id;
  }
 
  public int getparent_id() {
  return parent_id;
  }
 
  public void setparent_id(int parent_id) {
  this.parent_id = parent_id;
  }
 
  public string getregion_name() {
  return region_name;
  }
 
  public void setregion_name(string region_name) {
  this.region_name = region_name;
  }
 }
 }
}

5.主页调用，城市json数据很多解析耗时，进入页面会非常的慢，所以在子线程调用。有的地址没有第三级trycach，有就取没有就去二级

import android.os.handler;
import android.os.message;
import android.support.v7.app.appcompatactivity;
import android.os.bundle;
import android.view.view;
import android.widget.textview;
import com.bigkoo.pickerview.builder.optionspickerbuilder;
import com.bigkoo.pickerview.view.optionspickerview;
 
import java.util.arraylist;
 
 
public class mainactivity extends appcompatactivity {
 private textview tvaddress;
 private optionspickerview pvoptions;
 private levelslistdate levelslistdate;
 private arraylist<jsonbean> jsonbeans;
 private arraylist<arraylist<string>> arraylists;
 private arraylist<arraylist<arraylist<string>>> arraylists1;
 private handler handler1 = new handler() {
 @override
 public void handlemessage(message msg) {
  super.handlemessage(msg);
  try {
  showhypickerview();
  } catch (exception e) {
  e.printstacktrace();
  }
 }
 };
 
 @override
 protected void oncreate(bundle savedinstancestate) {
 super.oncreate(savedinstancestate);
 setcontentview(r.layout.activity_main);
 tvaddress = findviewbyid(r.id.tvaddress);
 tvaddress.setonclicklistener(new view.onclicklistener() {
  @override
  public void onclick(view v) {
  if (pvoptions != null) {
   pvoptions.show();
  }
  }
 });
 new thread(new runnable() {
  @override
  public void run() {
  try {
   levelslistdate = new levelslistdate(mainactivity.this);
   jsonbeans = levelslistdate.initjsondata("citys_data.json");
   arraylists = levelslistdate.initjsondata1("citys_data.json");
   arraylists1 = levelslistdate.initjsondata2("citys_data.json");
   handler1.sendemptymessage(1);
  } catch (exception e) {
   e.printstacktrace();
  }
  }
 }).start();
 }
 
 /**
 * 初始化城市选择器
 */
 private void showhypickerview() {
 //条件选择器
 pvoptions = new optionspickerbuilder(mainactivity.this, new com.bigkoo.pickerview.listener.onoptionsselectlistener() {
  @override
  public void onoptionsselect(int options1, int options2, int options3, view v) {
  try {
   // cityid = jsonbeans.get(options1).getcity().get(options2).getres().get(options3).getid() + "";
   tvaddress.settext(jsonbeans.get(options1).getcity().get(options2).getres().get(options3).getregion_name());
  } catch (exception e) {
   // cityid = jsonbeans.get(options1).getcity().get(options2).getid() + "";
   tvaddress.settext(jsonbeans.get(options1).getcity().get(options2).getregion_name());
  }
  }
 }).build();
 pvoptions.setpicker(jsonbeans, arraylists, arraylists1);
 }
}

github地址

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。