GitHub有一个开源控件PickerView，可以实现三级联动的效果。虽然该控件使用非常简单，但是填充数据异常繁琐。GitHub上的Demo在填充数据的时候是一条一条地填充的，代码过于冗余。下面提供一种简便的方式来实现。
(1)在app目录下新建一个assets文件夹，将province_data.xml文件复制到该文件夹下，该XML文件里保存了全国的省市县的地址数据。
(2)使用SAX解析xml文件中的数据，并将数据填充到PickerView这个控件中。
—ProvinceModel—
public class ProvinceModel implements IPickerViewData{ private String name; private List<CityModel> cityList; public ProvinceModel() { super(); } 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 getPickerViewText() { return name; }} —CityModel—
public class CityModel implements IPickerViewData{ private String name; private List<DistrictModel> districtList; public CityModel() { super(); } 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 name; } @Override public String getPickerViewText() { return name; }} —DistrictModel—
public class DistrictModel implements IPickerViewData{ private String name; private String zipcode; public DistrictModel() { super(); } public String getZipcode() { return zipcode; } public void setZipcode(String zipcode) { this.zipcode = zipcode; } public String getName() { return name; } public void setName(String name) { this.name = name; } @Override public String toString() { return name; } @Override public String getPickerViewText() { return name; }} —XmlParserHandler—
public class XmlParserHandler extends DefaultHandler{ /** * 存储所有的解析对象 */ private List<ProvinceModel> provinceList = new ArrayList<>(); private ProvinceModel provinceModel = new ProvinceModel(); private CityModel cityModel = new CityModel(); private DistrictModel districtModel = new DistrictModel(); public XmlParserHandler(){} public List<ProvinceModel> getDataList() { return provinceList; } @Override public void startDocument() throws SAXException { super.startDocument(); } @Override public void endDocument() throws SAXException { super.endDocument(); } @Override public void startElement(String uri, String localName, String qName, Attributes attributes) throws SAXException { 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 { 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 { super.characters(ch, start, length); }}
public class AddressAddActivity extends BaseActivity{ private OptionsPickerView mCityPickerView; private ArrayList<ProvinceModel> mProvinces = new ArrayList<>(); private ArrayList<ArrayList<CityModel>> mCities = new ArrayList<>(); private ArrayList<ArrayList<ArrayList<DistrictModel>>> mDistricts = new ArrayList<>(); @Override protected void onCreate(@Nullable Bundle savedInstanceState) { super.onCreate(savedInstanceState); supportRequestWindowFeature(Window.FEATURE_NO_TITLE); setContentView(R.layout.activity_address_add); ViewUtils.inject(this); init(); } private void init() { initProvinceDatas(); try { //选项选择器 mCityPickerView = new OptionsPickerView(this); mCityPickerView.setPicker( mProvinces, mCities, mDistricts, true); mCityPickerView.setTitle("选择城市"); mCityPickerView.setCyclic(false, false , false); mCityPickerView.setOnoptionsSelectListener(new OptionsPickerView.OnOptionsSelectListener() { @Override public void onOptionsSelect(int options1, int option2, int options3) { String address = mProvinces.get(options1).getName() + " " + mCities.get(options1).get(option2) + " " + mDistricts.get(options1).get(option2).get(options3); mTxtAddress.setText(address); } }); } catch (Exception e) { e.printStackTrace(); } } @OnClick(R.id.ll_city_picker) public void showpickerView(View view) { mCityPickerView.show(); } protected void initProvinceDatas() { AssetManager asset = getAssets(); try { InputStream input = asset.open("province_data.xml"); SAXParserFactory spf = SAXParserFactory.newInstance(); SAXParser parser = spf.newSAXParser(); XmlParserHandler handler = new XmlParserHandler(); parser.parse(input , handler); input.close(); //获取解析出来的数据 mProvinces = (ArrayList<ProvinceModel>) handler.getDataList(); } catch (Throwable e) { e.printStackTrace(); } if (mProvinces != null) { for (ProvinceModel p : mProvinces) { List<CityModel> cities = p.getCityList(); //组装城市数据 mCities.add((ArrayList<CityModel>) cities); ArrayList<ArrayList<DistrictModel>> dts = new ArrayList<>(); for (CityModel c : cities) { List<DistrictModel> districts = c.getDistrictList(); dts.add((ArrayList<DistrictModel>) districts); } mDistricts.add(dts); } } }} 到此完毕，很简单的例子。
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