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This article shares the android wheel province, city, and county three-level联动 effect for everyone's reference, the specific content is as follows
There is an Android-The open-source control of wheel, code address:https://github.com/maarek/android-wheel
Source Code Download Address:http://xiazai.jb51.net/201610/yuanma/AndroidCascadeMaster(jb51.net).rar
Main Interface Layout
activity_main.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#E"9E9E9"
android:orientation="vertical" >"
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal" >"
<kankan.wheel.widget.WheelView
android:id="@"+id/id_province"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1" >"
</kankan.wheel.widget.WheelView>
<kankan.wheel.widget.WheelView
android:id="@"+id/id_city"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1" >"
</kankan.wheel.widget.WheelView>
<kankan.wheel.widget.WheelView
android:id="@"+id/id_district"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1" >"
</kankan.wheel.widget.WheelView>
</LinearLayout>
<Button
android:id="@"+id/btn_confirm"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="10dip"
android:gravity="center"
android:text="Confirm"
android:textColor="#000000" />
</LinearLayout>
Under the assets resource file--province_data.xml (part)
<root> <province name="Anhui Province"> <city name="Anqing City"> <district name="Zongyang County" zipcode="246000" /> <district name="Daguan District" zipcode="246000" /> <district name="Huaning County" zipcode="246000" /> <district name="Qianshan County" zipcode="246000" /> <district name="Susong County" zipcode="246000" /> <district name="Taohu County" zipcode="246000" /> <district name="Tongcheng City" zipcode="246000" /> <district name="Wangjiang County" zipcode="246000" /> <district name="Yixiu District" zipcode="246000" /> <district name="Yingjiang District" zipcode="246000" /> <district name="Yuxi County" zipcode="246000" /> <district name="other" zipcode="246000" /> </city>
First look at the bean classes for provinces, cities, and towns
ProvinceModel
package com.mrwujay.cascade.model;
import java.util.List;
public class ProvinceModel {
private String name;
private List<CityModel> cityList;
public ProvinceModel() {
super();
}
public ProvinceModel(String name, List<CityModel> cityList) {
super();
this.name = name;
this.cityList = cityList;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public List<CityModel> getCityList() {
return cityList;
}
public void setCityList(List<CityModel> cityList) {
this.cityList = cityList;
}
@Override
public String toString() {
return "ProvinceModel [name=" + name + ", cityList=" + cityList + "]";
}
}
package com.mrwujay.cascade.model;
import java.util.List;
public class CityModel {
private String name;
private List<DistrictModel> districtList;
public CityModel() {
super();
}
public CityModel(String name, List<DistrictModel> districtList) {
super();
this.name = name;
this.districtList = districtList;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public List<DistrictModel> getDistrictList() {
return districtList;
}
public void setDistrictList(List<DistrictModel> districtList) {
this.districtList = districtList;
}
@Override
public String toString() {
return "CityModel [name=" + name + ", districtList=" + districtList
+ "]";
}
}
DistrictModel
package com.mrwujay.cascade.model;
public class DistrictModel {
private String name;
private String zipcode;
public DistrictModel() {
super();
}
public DistrictModel(String name, String zipcode) {
super();
this.name = name;
this.zipcode = zipcode;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getZipcode() {
return zipcode;
}
public void setZipcode(String zipcode) {
this.zipcode = zipcode;
}
@Override
public String toString() {
return "DistrictModel [name=" + name + ", zipcode=" + zipcode + "]";
}
}
See the custom XmlParserHandler
package com.mrwujay.cascade.service;
import java.util.ArrayList;
import java.util.List;
import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;
import com.mrwujay.cascade.model.CityModel;
import com.mrwujay.cascade.model.DistrictModel;
import com.mrwujay.cascade.model.ProvinceModel;
public class XmlParserHandler extends DefaultHandler {
/**
* Store all the parsed objects
*/
private List<ProvinceModel> provinceList = new ArrayList<ProvinceModel>();
public XmlParserHandler() {
}
/**
* Methods exposed to the outside
*/
public List<ProvinceModel> getDataList() {
return provinceList;
}
@Override
public void startDocument() throws SAXException {
// When the first start tag is read, this method is triggered.
}
ProvinceModel provinceModel = new ProvinceModel();
CityModel cityModel = new CityModel();
DistrictModel districtModel = new DistrictModel();
/**
* <province name="Anhui Province">
<city name="Anqing City">
<district name="Zongyang County" zipcode="246000" />
<district name="Daguan District" zipcode="246000" />
<district name="Huaning County" zipcode="246000" />
<district name="Qianshan County" zipcode="246000" />
<district name="Susong County" zipcode="246000" />
<district name="Taohu County" zipcode="246000" />
<district name="Tongcheng City" zipcode="246000" />
<district name="Wangjiang County" zipcode="246000" />
<district name="Yixiu District" zipcode="246000" />
<district name="Yingjiang District" zipcode="246000" />
<district name="Yuxi County" zipcode="246000" />
<district name="other" zipcode="246000" />
</city>
*/
@Override
public void startElement(String uri, String localName, String qName,
Attributes attributes) throws SAXException {
// When encountering a start tag, call this method
if (qName.equals("province")) {
provinceModel = new ProvinceModel();
provinceModel.setName(attributes.getValue(0));
provinceModel.setCityList(new ArrayList<CityModel>());
} else if (qName.equals("city")) {
cityModel = new CityModel();
cityModel.setName(attributes.getValue(0));
cityModel.setDistrictList(new ArrayList<DistrictModel>());
else if (qName.equals("district")) {
districtModel = new DistrictModel();
districtModel.setName(attributes.getValue(0));
districtModel.setZipcode(attributes.getValue(1));
}
}
@Override
public void endElement(String uri, String localName, String qName)
throws SAXException {
// When encountering the end tag, this method will be called
if (qName.equals("district")) {
cityModel.getDistrictList().add(districtModel);
} else if (qName.equals("city")) {
provinceModel.getCityList().add(cityModel);
} else if (qName.equals("province")) {
provinceList.add(provinceModel);
}
}
@Override
public void characters(char[] ch, int start, int length)
throws SAXException {
}
}
Next let's see the base class BaseActivity
package com.mrwujay.cascade.activity;
import java.io.InputStream;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;
import android.app.Activity;
import android.content.res.AssetManager;
import com.mrwujay.cascade.model.CityModel;
import com.mrwujay.cascade.model.DistrictModel;
import com.mrwujay.cascade.model.ProvinceModel;
import com.mrwujay.cascade.service.XmlParserHandler;
public class BaseActivity extends Activity {
/**
* All provinces
*/
protected String[] mProvinceDatas;
/**
* Key - Province value - City
*/
protected Map<String, String[]> mCitisDatasMap = new HashMap<String, String[]>();
/**
* Key - City values - District
*/
protected Map<String, String[]> mDistrictDatasMap = new HashMap<String, String[]>();
/**
* Key - District values - Postal code
*/
protected Map<String, String> mZipcodeDatasMap = new HashMap<String, String>();
/**
* Current province name
*/
protected String mCurrentProviceName;
/**
* Current city name
*/
protected String mCurrentCityName;
/**
* Current district name
*/
protected String mCurrentDistrictName = "";
/**
* Current district postal code
*/
protected String mCurrentZipCode = "";
/**
* Parse the XML data of provinces, cities, and districts
*/
protected void initProvinceDatas() {
//List of province collections
List<ProvinceModel> provinceList = null;
//Get resources
AssetManager asset = getAssets();
try {
//Get input stream
InputStream input = asset.open("province_data.xml");
// Create a factory object for parsing xml
SAXParserFactory spf = SAXParserFactory.newInstance();
// Parse xml
SAXParser parser = spf.newSAXParser();
//Parsing tool
XmlParserHandler handler = new XmlParserHandler();
//Perform parsing
parser.parse(input, handler);
input.close();
// Get the parsed data
provinceList = handler.getDataList();
// */ Initialize the default selected province, city, and district
if (provinceList != null && !provinceList.isEmpty()) {
//Get the first province
mCurrentProviceName = provinceList.get(0).getName();
List<CityModel> cityList = provinceList.get(0).getCityList();
if (cityList != null && !cityList.isEmpty()) {
//Get the name of the first city of the first province
mCurrentCityName = cityList.get(0).getName();
List<DistrictModel> districtList = cityList.get(0)
.getDistrictList();
//Get the name of the first county of the first city of the first province
mCurrentDistrictName = districtList.get(0).getName();
mCurrentZipCode = districtList.get(0).getZipcode();
}
}
// */
mProvinceDatas = new String[provinceList.size()];
for (int i = 0; i < provinceList.size(); i++) {
// Traverse all province data
mProvinceDatas[i] = provinceList.get(i).getName();
List<CityModel> cityList = provinceList.get(i).getCityList();
String[] cityNames = new String[cityList.size()];
for (int j = 0; j < cityList.size(); j++) {
// Traverse all city data under the province
cityNames[j] = cityList.get(j).getName();
List<DistrictModel> districtList = cityList.get(j)
.getDistrictList();
String[] distrinctNameArray = new String[districtList
.size()];
DistrictModel[] distrinctArray = new DistrictModel[districtList
.size()];
for (int k = 0; k < districtList.size(); k++) {
// Traverse all districts under the city/The data of the county
DistrictModel districtModel = new DistrictModel(
districtList.get(k).getName(), districtList
.get(k).getZipcode());
// District/The postal code corresponding to the county, save to mZipcodeDatasMap
mZipcodeDatasMap.put(districtList.get(k).getName(),
districtList.get(k).getZipcode());
distrinctArray[k] = districtModel;
distrinctNameArray[k] = districtModel.getName();
}
// City-District/Save the data of the county to mDistrictDatasMap
mDistrictDatasMap.put(cityNames[j], distrinctNameArray);
}
// Province-Save the data of the city to mCitisDatasMap
mCitisDatasMap.put(provinceList.get(i).getName(), cityNames);
}
{ catch (Throwable e) {
e.printStackTrace();
}
}
}
}
Main interface MainActivity
package com.mrwujay.cascade.activity;
import com.mrwujay.cascade.R;
import com.mrwujay.cascade.R.id;
import com.mrwujay.cascade.R.layout;
import kankan.wheel.widget.OnWheelChangedListener;
import kankan.wheel.widget.WheelView;
import kankan.wheel.widget.adapters.ArrayWheelAdapter;
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;
public class MainActivity extends BaseActivity implements OnClickListener, OnWheelChangedListener {
private WheelView mViewProvince;
private WheelView mViewCity;
private WheelView mViewDistrict;
private Button mBtnConfirm;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
setUpViews();
setUpListener();
setUpData();
}
private void setUpViews() {
mViewProvince = (WheelView) findViewById(R.id.id_province);
mViewCity = (WheelView) findViewById(R.id.id_city);
mViewDistrict = (WheelView) findViewById(R.id.id_district);
mBtnConfirm = (Button) findViewById(R.id.btn_confirm);
}
private void setUpListener() {
// Add change event
mViewProvince.addChangingListener(this);
// Add change event
mViewCity.addChangingListener(this);
// Add change event
mViewDistrict.addChangingListener(this);
// Add onclick event
mBtnConfirm.setOnClickListener(this);
}
private void setUpData() {
initProvinceDatas();
mViewProvince.setViewAdapter(new ArrayWheelAdapter<String>(MainActivity.this, mProvinceDatas));
// Set the number of visible items
mViewProvince.setVisibleItems(7);
mViewCity.setVisibleItems(7);
mViewDistrict.setVisibleItems(7);
updateCities();
updateAreas();
}
/**
* Update the information of the city WheelView based on the current province
*/
private void updateCities() {
//Get the item index value of the current province
int pCurrent = mViewProvince.getCurrentItem();
//The current province name of the lake area
mCurrentProviceName = mProvinceDatas[pCurrent];
//Get the array collection of cities under the current province
String[] cities = mCitisDatasMap.get(mCurrentProviceName);
if (cities == null) {
cities = new String[] { "" };
}
mViewCity.setViewAdapter(new ArrayWheelAdapter<String>(this, cities));
mViewCity.setCurrentItem(0);
updateAreas();
}
/**
* Update the information of the WheelView for areaWheelView based on the current city
*/
private void updateAreas() {
int pCurrent = mViewCity.getCurrentItem();
mCurrentCityName = mCitisDatasMap.get(mCurrentProviceName)[pCurrent];
String[] areas = mDistrictDatasMap.get(mCurrentCityName);
if (areas == null) {
areas = new String[] { "" };
}
mViewDistrict.setViewAdapter(new ArrayWheelAdapter<String>(this, areas));
mViewDistrict.setCurrentItem(0);
}
/**
* Callback of the interface method implementation
*/
@Override
public void onChanged(WheelView wheel, int oldValue, int newValue) {
// TODO Auto-generated method stub
if (wheel == mViewProvince) {
updateCities();
} else if (wheel == mViewCity) {
updateAreas();
} else if (wheel == mViewDistrict) {
//Get the name of the county
mCurrentDistrictName = mDistrictDatasMap.get(mCurrentCityName)[newValue];
//Get the county code
mCurrentZipCode = mZipcodeDatasMap.get(mCurrentDistrictName);
}
}
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.btn_confirm:
showSelectedResult();
break;
default:
break;
}
}
private void showSelectedResult() {
Toast.makeText(MainActivity.this, "Current selection:"+mCurrentProviceName+","+mCurrentCityName+","
+mCurrentDistrictName+","+mCurrentZipCode, Toast.LENGTH_SHORT).show();
}
}
还有2个drawable
wheel_bg.xml
<?xml version="1.0" encoding="utf-8"?> <layer-list xmlns:android="http://schemas.android.com/apk/res/android"> </layer-list>
wheel_val.xml
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android" >
<gradient
android:angle="90"
android:centerColor="#70222222"
android:endColor="#70EEEEEE"
android:startColor="#70222222" />
<stroke
android:width="20dp"
android:color="#FF69B4" />
</shape>
That's all for this article. Hope it will be helpful to your study, and also hope everyone will support the Yelling Tutorial.
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