这篇文章给大家介绍怎么在Android中实现一个三级联动，内容非常详细，感兴趣的小伙伴们可以参考借鉴，希望对大家能有所帮助。
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); } }关于怎么在Android中实现一个三级联动就分享到这里了，希望以上内容可以对大家有一定的帮助，可以学到更多知识。如果觉得文章不错，可以把它分享出去让更多的人看到。
免责声明：本站发布的内容（图片、视频和文字）以原创、转载和分享为主，文章观点不代表本网站立场，如果涉及侵权请联系站长邮箱：is@yisu.com进行举报，并提供相关证据，一经查实，将立刻删除涉嫌侵权内容。
