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如何在Android中使用WheelView實(shí)現(xiàn)三級(jí)聯(lián)動(dòng)
這篇文章將為大家詳細(xì)講解有關(guān)如何在Android中使用WheelView實(shí)現(xiàn)三級(jí)聯(lián)動(dòng)，文章內(nèi)容質(zhì)量較高，因此小編分享給大家做個(gè)參考，希望大家閱讀完這篇文章后對(duì)相關(guān)知識(shí)有一定的了解。
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popupwindow中是三個(gè)wheelview，
<?xml version="1.0" encoding="utf-8"?>
b. 因?yàn)樯厦嬲f了，需要將文件copy到app目錄下，所以直接最好這代碼在application中寫，
package guozhaohui.com.wlylocationchoose;
import android.app.Application;
import java.io.InputStream;
import guozhaohui.com.wlylocationchoose.locationchoose.CityDataHelper;
/**
* Created by ${GuoZhaoHui} on 2017/2/13.
* Abstract:
*/
public class MyApplication extends Application {
private CityDataHelper dataHelper;
@Override
public void onCreate() {
super.onCreate();
/**
* 放在application中，讓app一啟動(dòng)就把raw中文件copy到 "/data/data/"+context.getPackageName()+"/databases/"
* 這是app讀取數(shù)據(jù)的方法，不管是將數(shù)據(jù)庫文件放在raw或者assets中都是一樣
*/
dataHelper=CityDataHelper.getInstance(this);
InputStream in = this.getResources().openRawResource(R.raw.city);
dataHelper.copyFile(in,CityDataHelper.DATABASE_NAME,CityDataHelper.DATABASES_DIR);
}
}c. popupwindow不是本次的重點(diǎn)也直接貼代碼。
View popupView = LayoutInflater.from(this).inflate(R.layout.popup_locationchoose, null); mPopupWindow = new PopupWindow(popupView, ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT, true); mPopupWindow.setTouchable(true); mPopupWindow.setFocusable(true); mPopupWindow.setOutsideTouchable(true); mPopupWindow.setAnimationStyle(R.style.popup_locationchoose_bottom); // pickText = (TextView)popupView.findViewById(R.id.tv_pickText); provinceView = (WheelView)popupView.findViewById(R.id.provinceView); cityView = (WheelView)popupView.findViewById(R.id.cityView); districtView = (WheelView)popupView.findViewById(R.id.districtView); //確定或者取消 btn_myinfo_sure = (TextView)popupView.findViewById(R.id.btn_myinfo_sure); btn_myinfo_cancel = (TextView) popupView.findViewById(R.id.btn_myinfo_cancel); btn_myinfo_cancel.setOnClickListener(this); btn_myinfo_sure.setOnClickListener(this);
設(shè)置三個(gè)wheelview的可見條目數(shù)
provinceView.setVisibleItems(7); cityView.setVisibleItems(7); districtView.setVisibleItems(7);
為三個(gè) wheelview添加滑動(dòng)事件
// 添加change事件 provinceView.addChangingListener(this); // 添加change事件 cityView.addChangingListener(this); // 添加change事件 districtView.addChangingListener(this);
c. 拿到操作數(shù)據(jù)的對(duì)象SQLiteDatabase
db = dataHelper.openDataBase();
觀察數(shù)據(jù)庫文件可知這表中是根據(jù)字段level來判斷省市區(qū)的，如圖
同時(shí)我們也可知這省市區(qū)三個(gè)模型中的字段都是一樣的，都是
private int cityID; private int parentId; private int level; private String name; private String pinyin;
不清楚的可以自己查下表，如圖，我查一個(gè)省
所以我們建立一樣的模型，雖然三個(gè)字段是一樣的，建一個(gè)就可以了，但是為了標(biāo)準(zhǔn)最好還是建三個(gè)。
package guozhaohui.com.wlylocationchoose.locationchoose.model;
public class ProvinceModel {
private int cityID;
private int parentId;
private int level;
private String name;
private String pinyin;
public int getCityID() {
return cityID;
}
public void setCityID(int cityID) {
this.cityID = cityID;
}
public int getParentId() {
return parentId;
}
public void setParentId(int parentId) {
this.parentId = parentId;
}
public int getLevel() {
return level;
}
public void setLevel(int level) {
this.level = level;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getPinyin() {
return pinyin;
}
public void setPinyin(String pinyin) {
this.pinyin = pinyin;
}
}進(jìn)行sql查詢，將查詢到的結(jié)果保存在cursor中，然后進(jìn)行一行行的循環(huán)遍歷，然后將遍歷一行的對(duì)象添加到這個(gè)對(duì)象的集合中。這里得到省的集合。
public ListgetProvice(SQLiteDatabase db){ String sql="SELECT * FROM ChooseCityModel where level = 1 ORDER BY cityID"; Cursor cursor = db.rawQuery(sql,null); List list=new ArrayList (); if (cursor!=null&&cursor.getCount() > 0) { while (cursor.moveToNext()){ ProvinceModel provinceModel=new ProvinceModel(); provinceModel.setCityID(cursor.getInt(cursor.getColumnIndex("cityID"))); provinceModel.setParentId(cursor.getInt(cursor.getColumnIndex("parentId"))); provinceModel.setLevel(cursor.getInt(cursor.getColumnIndex("level"))); provinceModel.setName(cursor.getString(cursor.getColumnIndex("name"))); provinceModel.setPinyin(cursor.getString(cursor.getColumnIndex("pinyin"))); list.add(provinceModel); } } return list; }
根據(jù)表的結(jié)構(gòu)，得到相應(yīng)的sql語句，希望根據(jù)上一級(jí)省的cityId得到下面的市，其實(shí)換句話說本級(jí)市的parentId就是上一級(jí)的cityid，不清楚的可以將sql語句查一遍，驗(yàn)證下對(duì)不對(duì)，如圖
得到相應(yīng)省下面市的集合
public ListgetCityByParentId(SQLiteDatabase db, String code){ String sql="SELECT * FROM ChooseCityModel WHERE level = 2 and parentId = ? ORDER BY cityID"; Cursor cursor = db.rawQuery(sql,new String[][code]); List list=new ArrayList (); if (cursor!=null&&cursor.getCount() > 0) { while (cursor.moveToNext()){ CityModel cityModel=new CityModel(); cityModel.setCityID(cursor.getInt(cursor.getColumnIndex("cityID"))); cityModel.setParentId(cursor.getInt(cursor.getColumnIndex("parentId"))); cityModel.setLevel(cursor.getInt(cursor.getColumnIndex("level"))); cityModel.setName(cursor.getString(cursor.getColumnIndex("name"))); cityModel.setPinyin(cursor.getString(cursor.getColumnIndex("pinyin"))); list.add(cityModel); } } return list; }
區(qū)也是一樣的，直接貼代碼了
public ListgetDistrictById(SQLiteDatabase db, String code){ //注意這里的parentId其實(shí)就是上一級(jí)的cityID String sql="SELECT * FROM ChooseCityModel WHERE level = 3 and parentId = ? ORDER BY cityID"; Cursor cursor = db.rawQuery(sql,new String[][code]); List list=new ArrayList (); if (cursor!=null&&cursor.getCount() > 0) { while (cursor.moveToNext()){ DistrictModel districtModel=new DistrictModel(); districtModel.setCityID(cursor.getInt(cursor.getColumnIndex("cityID"))); districtModel.setParentId(cursor.getInt(cursor.getColumnIndex("parentId"))); districtModel.setLevel(cursor.getInt(cursor.getColumnIndex("level"))); districtModel.setName(cursor.getString(cursor.getColumnIndex("name"))); districtModel.setPinyin(cursor.getString(cursor.getColumnIndex("pinyin"))); list.add(districtModel); } } return list; }
d. 對(duì)彈出popuwindow顯示的wheelview進(jìn)行初始化，注釋都寫在代碼里，
private void initpopData() {
//初始化數(shù)據(jù)
dataHelper = CityDataHelper.getInstance(this);
db = dataHelper.openDataBase();
provinceDatas = dataHelper.getProvice(db);
if (provinceDatas.size() > 0) {
//彈出popup時(shí)，省wheelview中當(dāng)前的省其實(shí)就是省集合的第一個(gè)
mCurrentProvince = provinceDatas.get(0).getName();
//根據(jù)省cityid查詢到第一個(gè)省下面市的集合
cityDatas = dataHelper.getCityByParentId(db, provinceDatas.get(0).getCityID()+"");
}
if (cityDatas.size() > 0) {
//根據(jù)市cityid查詢到第一個(gè)市集合下面區(qū)的集合
districtDatas = dataHelper.getDistrictById(db, cityDatas.get(0).getCityID()+"");
}
//wheelview的適配器代碼
provinceAdapter = new ProvinceAdapter(this, provinceDatas);
provinceAdapter.setTextSize(TEXTSIZE);//設(shè)置字體大小
provinceView.setViewAdapter(provinceAdapter);
updateCitys();
updateAreas();
}更新省下面市的wheelview內(nèi)容，注釋很清楚，直接上代碼
private void updateCitys() {
int pCurrent = provinceView.getCurrentItem();
if (provinceDatas.size() > 0) {
//這里是必須的的，上面得到的集合只是第一個(gè)省下面所有市的集合及第一個(gè)市下面所有區(qū)的集合
//這里得到的是相應(yīng)省下面對(duì)應(yīng)市的集合
cityDatas = dataHelper.getCityByParentId(db, provinceDatas.get(pCurrent).getCityID()+"");
} else {
cityDatas.clear();
}
citysAdapter = new CitysAdapter(this, cityDatas);
citysAdapter.setTextSize(TEXTSIZE);
cityView.setViewAdapter(citysAdapter);
if (cityDatas.size() > 0) {
//默認(rèn)省下面 市wheelview滑動(dòng)第一個(gè)，顯示第一個(gè)市
cityView.setCurrentItem(0);
mCurrentCity = cityDatas.get(0).getName();
} else {
mCurrentCity = "";
}
updateAreas();
}第三個(gè)wheelview和第二個(gè)一樣的，代碼直接上
private void updateAreas() {
int cCurrent = cityView.getCurrentItem();
if (cityDatas.size() > 0) {
districtDatas = dataHelper.getDistrictById(db, cityDatas.get(cCurrent).getCityID()+"");
} else {
districtDatas.clear();
}
areaAdapter = new AreaAdapter(this, districtDatas);
areaAdapter.setTextSize(TEXTSIZE);
districtView.setViewAdapter(areaAdapter);
if (districtDatas.size() > 0) {
mCurrentDistrict = districtDatas.get(0).getName();
districtView.setCurrentItem(0);
} else {
mCurrentDistrict = "";
}
}關(guān)于如何在Android中使用WheelView實(shí)現(xiàn)三級(jí)聯(lián)動(dòng)就分享到這里了，希望以上內(nèi)容可以對(duì)大家有一定的幫助，可以學(xué)到更多知識(shí)。如果覺得文章不錯(cuò)，可以把它分享出去讓更多的人看到。
標(biāo)題名稱：如何在Android中使用WheelView實(shí)現(xiàn)三級(jí)聯(lián)動(dòng)
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