Android PickerView实现三级联动效果
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2022-07-04 09:53:30
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...
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。