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這篇文章將為大家詳細講解有關如何在Android中使用WheelView實現三級聯動，文章內容質量較高，因此小編分享給大家做個參考，希望大家閱讀完這篇文章后對相關知識有一定的了解。
popupwindow中是三個wheelview，
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:background="#00000000" android:gravity="bottom" android:layout_width="match_parent" android:layout_height="match_parent"> <LinearLayout android:id="@+id/ly_myinfo_changeaddress_child" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_alignParentBottom="true" android:background="#ffffff" android:orientation="vertical" > <RelativeLayout android:layout_width="match_parent" android:layout_height="44dp" > <View android:background="@color/silver" android:layout_width="match_parent" android:layout_height="0.5dp" /> <TextView android:id="@+id/btn_myinfo_cancel" android:layout_width="wrap_content" android:layout_height="match_parent" android:paddingLeft="18dp" android:text="取消" android:gravity="center" android:layout_alignParentLeft="true" android:layout_marginRight="15dip" android:textColor="#e84515" android:textSize="14sp" /> <TextView android:id="@+id/btn_myinfo_sure" android:layout_width="wrap_content" android:layout_height="match_parent" android:layout_alignParentRight="true" android:gravity="center" android:text="完成" android:textColor="#e84515" android:paddingRight="18dp" android:textSize="14sp" /> </RelativeLayout> <View android:layout_width="match_parent" android:layout_height="1dp" android:background="#d8d8d8"/> <LinearLayout android:layout_width="match_parent" android:layout_height="190dip" android:orientation="horizontal" android:gravity="center_vertical"> <guozhaohui.com.wlylocationchoose.locationchoose.WheelView android:id="@+id/provinceView" android:layout_width="match_parent" android:layout_height="match_parent" android:layout_weight="1"/> <guozhaohui.com.wlylocationchoose.locationchoose.WheelView android:id="@+id/cityView" android:layout_width="match_parent" android:layout_height="match_parent" android:layout_weight="1"/> <guozhaohui.com.wlylocationchoose.locationchoose.WheelView android:id="@+id/districtView" android:layout_width="match_parent" android:layout_height="match_parent" android:layout_weight="1"/> </LinearLayout> </LinearLayout> </LinearLayout>
b. 因為上面說了，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一啟動就把raw中文件copy到 "/data/data/"+context.getPackageName()+"/databases/"
* 這是app讀取數據的方法，不管是將數據庫文件放在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);
設置三個wheelview的可見條目數
provinceView.setVisibleItems(7); cityView.setVisibleItems(7); districtView.setVisibleItems(7);
為三個 wheelview添加滑動事件
// 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. 拿到操作數據的對象SQLiteDatabase
db = dataHelper.openDataBase();
觀察數據庫文件可知這表中是根據字段level來判斷省市區的，如圖
同時我們也可知這省市區三個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，我查一個省
所以我們建立一樣的模型，雖然三個字段是一樣的，建一個就可以了，但是為了標準最好還是建三個。
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;
}
}進行sql查詢，將查詢到的結果保存在cursor中，然后進行一行行的循環遍歷，然后將遍歷一行的對象添加到這個對象的集合中。這里得到省的集合。
public List<ProvinceModel> getProvice(SQLiteDatabase db){
String sql="SELECT * FROM ChooseCityModel where level = 1 ORDER BY cityID";
Cursor cursor = db.rawQuery(sql,null);
List<ProvinceModel> list=new ArrayList<ProvinceModel>();
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;
}根據表的結構，得到相應的sql語句，希望根據上一級省的cityId得到下面的市，其實換句話說本級市的parentId就是上一級的cityid，不清楚的可以將sql語句查一遍，驗證下對不對，如圖
得到相應省下面市的集合
public List<CityModel> getCityByParentId(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<CityModel> list=new ArrayList<CityModel>();
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;
}區也是一樣的，直接貼代碼了
public List<DistrictModel> getDistrictById(SQLiteDatabase db, String code){
//注意這里的parentId其實就是上一級的cityID
String sql="SELECT * FROM ChooseCityModel WHERE level = 3 and parentId = ? ORDER BY cityID";
Cursor cursor = db.rawQuery(sql,new String[][code]);
List<DistrictModel> list=new ArrayList<DistrictModel>();
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. 對彈出popuwindow顯示的wheelview進行初始化，注釋都寫在代碼里，
private void initpopData() {
//初始化數據
dataHelper = CityDataHelper.getInstance(this);
db = dataHelper.openDataBase();
provinceDatas = dataHelper.getProvice(db);
if (provinceDatas.size() > 0) {
//彈出popup時，省wheelview中當前的省其實就是省集合的第一個
mCurrentProvince = provinceDatas.get(0).getName();
//根據省cityid查詢到第一個省下面市的集合
cityDatas = dataHelper.getCityByParentId(db, provinceDatas.get(0).getCityID()+"");
}
if (cityDatas.size() > 0) {
//根據市cityid查詢到第一個市集合下面區的集合
districtDatas = dataHelper.getDistrictById(db, cityDatas.get(0).getCityID()+"");
}
//wheelview的適配器代碼
provinceAdapter = new ProvinceAdapter(this, provinceDatas);
provinceAdapter.setTextSize(TEXTSIZE);//設置字體大小
provinceView.setViewAdapter(provinceAdapter);
updateCitys();
updateAreas();
}更新省下面市的wheelview內容，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省下面所有市的集合及第一個市下面所有區的集合
//這里得到的是相應省下面對應市的集合
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) {
//默認省下面 市wheelview滑動第一個，顯示第一個市
cityView.setCurrentItem(0);
mCurrentCity = cityDatas.get(0).getName();
} else {
mCurrentCity = "";
}
updateAreas();
}第三個wheelview和第二個一樣的，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 = "";
}
}關于如何在Android中使用WheelView實現三級聯動就分享到這里了，希望以上內容可以對大家有一定的幫助，可以學到更多知識。如果覺得文章不錯，可以把它分享出去讓更多的人看到。
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