Android PickerView实现三级联动效果

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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