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Android PickerView实现三级联动效果

2019-01-18 00:02 656 查看

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。

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持脚本之家。

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