Android PickerView实现 * 联动效果

GitHub有一个开源控件PickerView，可以实现 * 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。

来源：https://blog.csdn.net/qq_33022345/article/details/53053767