实例介绍
【实例截图】
【核心代码】
package com.example.choosecity; import java.io.IOException; import java.io.InputStream; import java.util.HashMap; import java.util.Map; import org.json.JSONArray; import org.json.JSONException; import org.json.JSONObject; import android.app.Activity; import android.content.SharedPreferences; import android.os.Bundle; import android.util.Log; import android.view.View; import android.view.Window; import android.widget.Toast; /** * * @author zhy * */ public class CitiesActivity extends Activity implements OnWheelChangedListener { /** * 锟斤拷全锟斤拷锟绞★拷锟斤拷锟斤拷锟斤拷息锟斤拷json锟侥革拷式锟斤拷锟芥,锟斤拷锟斤拷锟斤拷珊锟街滴猲ull */ private JSONObject mJsonObj; /** * 省锟斤拷WheelView锟截硷拷 */ private WheelView mProvince; /** * 锟叫碉拷WheelView锟截硷拷 */ private WheelView mCity; /** * 锟斤拷锟絎heelView锟截硷拷 */ private WheelView mArea; /** * 锟斤拷锟斤拷省 */ private String[] mProvinceDatas; /** * key - 省 value - 锟斤拷s */ private Map<String, String[]> mCitisDatasMap = new HashMap<String, String[]>(); /** * key - 锟斤拷 values - 锟斤拷s */ private Map<String, String[]> mAreaDatasMap = new HashMap<String, String[]>(); /** * 锟斤拷前省锟斤拷锟斤拷锟� */ private String mCurrentProviceName; /** * 锟斤拷前锟叫碉拷锟斤拷锟� */ private String mCurrentCityName; /** * 锟斤拷前锟斤拷锟斤拷锟斤拷 */ private String mCurrentAreaName =""; String sb; SharedPreferences preferences; Map<Integer, Boolean> provinceMap ; Map<Integer, Boolean> cityMap ; Map<Integer, Boolean> areaMap ; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); requestWindowFeature(Window.FEATURE_NO_TITLE); setContentView(R.layout.citys); provinceMap = new HashMap<Integer, Boolean>(); cityMap = new HashMap<Integer, Boolean>(); areaMap = new HashMap<Integer, Boolean>(); initJsonData(); preferences=getSharedPreferences("wwwww", 0); mProvince = (WheelView) findViewById(R.id.id_province); mCity = (WheelView) findViewById(R.id.id_city); mArea = (WheelView) findViewById(R.id.id_area); initDatas(); mProvince.setViewAdapter(new ArrayWheelAdapter<String>(this, mProvinceDatas,0)); for (int i = 0; i < mProvinceDatas.length; i ) { provinceMap.put(i, false); if (i==0){ provinceMap.put(i, true); } } // 锟斤拷锟絚hange锟铰硷拷 mProvince.addChangingListener(this); // 锟斤拷锟絚hange锟铰硷拷 mCity.addChangingListener(this); // 锟斤拷锟絚hange锟铰硷拷 mArea.addChangingListener(this); mProvince.setVisibleItems(5); mCity.setVisibleItems(5); mArea.setVisibleItems(5); updateCities(0); updateAreas(0); } /** * 锟斤拷莸锟角帮拷锟斤拷校锟斤拷锟斤拷锟斤拷锟絎heelView锟斤拷锟斤拷息 */ private void updateAreas(int position) { int pCurrent = mCity.getCurrentItem(); mCurrentCityName = mCitisDatasMap.get(mCurrentProviceName)[pCurrent]; String[] areas = mAreaDatasMap.get(mCurrentCityName); if (areas == null) { areas = new String[] { "" }; } mArea.setViewAdapter(new ArrayWheelAdapter<String>(this, areas,position)); for (int i = 0; i < areas.length; i ) { areaMap.put(i, false); if (i==position){ areaMap.put(i, true); } } mArea.setCurrentItem(0); sb=areas[0]; Log.e("222222", sb); preferences.edit().putString("sb", sb).commit(); } /** * 锟斤拷莸锟角帮拷锟绞★拷锟斤拷锟斤拷锟斤拷锟絎heelView锟斤拷锟斤拷息 */ private void updateCities(int position) { int pCurrent = mProvince.getCurrentItem(); mCurrentProviceName = mProvinceDatas[pCurrent]; String[] cities = mCitisDatasMap.get(mCurrentProviceName); if (cities == null) { cities = new String[] { "" }; } mCity.setViewAdapter(new ArrayWheelAdapter<String>(this, cities,position)); mCity.setCurrentItem(0); // updateAreas(0); } /** * 锟斤拷锟斤拷锟斤拷锟絁son锟斤拷锟斤拷锟斤拷珊锟斤拷头锟絁son锟斤拷锟斤拷锟斤拷诖锟� */ private void initDatas() { try { JSONArray jsonArray = mJsonObj.getJSONArray("citylist"); mProvinceDatas = new String[jsonArray.length()]; for (int i = 0; i < jsonArray.length(); i ) { JSONObject jsonP = jsonArray.getJSONObject(i);// 每锟斤拷省锟斤拷json锟斤拷锟斤拷 String province = jsonP.getString("p");// 省锟斤拷锟斤拷 mProvinceDatas[i] = province; JSONArray jsonCs = null; try { /** * Throws JSONException if the mapping doesn't exist or is * not a JSONArray. */ jsonCs = jsonP.getJSONArray("c"); } catch (Exception e1) { continue; } String[] mCitiesDatas = new String[jsonCs.length()]; for (int j = 0; j < jsonCs.length(); j ) { JSONObject jsonCity = jsonCs.getJSONObject(j); String city = jsonCity.getString("n");// 锟斤拷锟斤拷锟斤拷 mCitiesDatas[j] = city; JSONArray jsonAreas = null; try { /** * Throws JSONException if the mapping doesn't exist or * is not a JSONArray. */ jsonAreas = jsonCity.getJSONArray("a"); } catch (Exception e) { continue; } String[] mAreasDatas = new String[jsonAreas.length()];// 锟斤拷前锟叫碉拷锟斤拷锟斤拷锟斤拷 for (int k = 0; k < jsonAreas.length(); k ) { String area = jsonAreas.getJSONObject(k).getString("s");// 锟斤拷锟斤拷锟斤拷锟斤拷 mAreasDatas[k] = area; } mAreaDatasMap.put(city, mAreasDatas); } mCitisDatasMap.put(province, mCitiesDatas); } } catch (JSONException e) { e.printStackTrace(); } mJsonObj = null; } /** * 锟斤拷assert锟侥硷拷锟斤拷锟叫讹拷取省锟斤拷锟斤拷锟絡son锟侥硷拷锟斤拷然锟斤拷转锟斤拷为json锟斤拷锟斤拷 */ private void initJsonData() { try { StringBuffer sb = new StringBuffer(); InputStream is = getAssets().open("city.json"); int len = -1; byte[] buf = new byte[1024]; while ((len = is.read(buf)) != -1) { sb.append(new String(buf, 0, len, "gbk")); } is.close(); mJsonObj = new JSONObject(sb.toString()); } catch (IOException e) { e.printStackTrace(); } catch (JSONException e) { e.printStackTrace(); } } /** * change锟铰硷拷锟侥达拷锟斤拷 */ @Override public void onChanged(WheelView wheel, int oldValue, int newValue) { if (wheel == mProvince) { mProvince.setViewAdapter(new ArrayWheelAdapter<String>(this, mProvinceDatas,newValue)); updateCities(0); updateAreas(0); mCurrentAreaName=""; } else if (wheel == mCity) { // updateCities(newValue); // updateAreas(0); int pCurrent = mProvince.getCurrentItem(); mCurrentProviceName = mProvinceDatas[pCurrent]; String[] cities = mCitisDatasMap.get(mCurrentProviceName); if (cities == null) { cities = new String[] { "" }; } mCity.setViewAdapter(new ArrayWheelAdapter<String>(this, cities,newValue)); int s = mCity.getCurrentItem(); mCurrentCityName = mCitisDatasMap.get(mCurrentProviceName)[s]; String[] areas = mAreaDatasMap.get(mCurrentCityName); if (areas == null) { areas = new String[] { "" }; } mArea.setViewAdapter(new ArrayWheelAdapter<String>(this, areas,0)); } else if (wheel == mArea) { int s = mCity.getCurrentItem(); mCurrentCityName = mCitisDatasMap.get(mCurrentProviceName)[s]; String[] areas = mAreaDatasMap.get(mCurrentCityName); if (areas == null) { areas = new String[] { "" }; } mArea.setViewAdapter(new ArrayWheelAdapter<String>(this, areas,newValue)); mCurrentAreaName = mAreaDatasMap.get(mCurrentCityName)[newValue]; } } public void showChoose(View view) { if(mCurrentAreaName.equals("")){ mCurrentAreaName=preferences.getString("sb", ""); } Toast.makeText(this, mCurrentProviceName mCurrentCityName mCurrentAreaName, 1).show(); // UIController.onBack(CitiesActivity.this, mCurrentProviceName, mCurrentCityName,mCurrentAreaName, // 10); } }
标签: 省市区的3级联动
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