【移动应用开发技术】Android如何实现尚型省市区三级联动选择效果

【移动应用开发技术】Android如何实现尚型省市区三级联动选择效果

这篇文章主要介绍了Android如何实现尚型省市区三级联动选择效果，具有一定借鉴价值，感兴趣的朋友可以参考下，希望大家阅读完这篇文章之后大有收获，下面让在下带着大家一起了解一下。Android省市区选择三级联动效果，一个不大不小的功能，就算你做过，但是没有相关的代码直接写，也要花掉你至少半天时间。先上效果图一、准备数据我是用的本地的json数据（走网络的话太慢，每次都要请求），放在asserts中。格式如下：[{

"name":

"河北省",

"city":

[

{

"name":

"石家庄市",

"area":

[

"长安区",

"桥东区",

"桥西区",

"新华区",

"郊

区",

"井陉矿区",

"井陉县",

"正定县",

"栾城县",

"行唐县",

"灵寿县",

"高邑县",

"深泽县",

"赞皇县",

"无极县",

"平山县",

"元氏县",

"赵

县",

"辛集市",

"藁",

"晋州市",

"新乐市",

"鹿泉市"

]

},]二、解析数据首先根据json生成Province对象然后通过getAssets().open("citylist.json");获取文件输入流，接着转成字节，最终获取字符串。然后用Gson解析字符串得到Province的List对象。由于读文件是IO操作，这里我用了RxJava，代码如下：/**

*

从assert文件夹中获取json数据

*/

private

void

initJsonData()

{

Observable.create(new

ObservableOnSubscribe<List<Province>>()

{

@Override

public

void

subscribe(ObservableEmitter<List<Province>>

emitter)

throws

Exception

{

List<Province>

provinces

=

new

ArrayList<>();

try

{

StringBuffer

sb

=

new

StringBuffer();

InputStream

is

=

getAssets().open("citylist.json");//打开json数据

byte[]

by

=

new

byte[is.available()];//转字节

int

len

=

-1;

while

((len

=

is.read(by))

!=

-1)

{

sb.append(new

String(by,

0,

len,

"utf8"));//根据字节长度设置编码

}

is.close();//

关闭流

//

通过Gson将字符串转成对象list

Gson

gson

=

new

Gson();

provinces

=

gson.fromJson(sb.toString(),

new

TypeToken<List<Province>>()

{

}.getType());

}

catch

(Exception

e)

{

e.printStackTrace();

}

finally

{

emitter.onNext(provinces);

}

}

}).subscribeOn(Schedulers.io())

.observeOn(AndroidSchedulers.mainThread())

.subscribe(new

Consumer<List<Province>>()

{

@Override

public

void

accept(List<Province>

provinces)

throws

Exception

{

if

(provinces

!=

null

&&

provinces.size()

>

0)

{

RegionSelectAvinces

=

provinces;

//

显示数据

showData();

}

}

});

}三、显示数据RxJava异步读取数据后就可以显示了，这里用了三个Spinner来分别显示省，市，区数据。显示的思路大家都清楚，这里不再赘述，代码如下/**

*

展示数据

*/

private

void

showData()

{

for

(Province

province

:

provinces)

{

provinceList.add(province.getName());

}

//

显示省份数据

spProvince.setAdapter(new

ArrayAdapter<String>(this,

android.R.layout.simple_spinner_item,

provinceList));

spProvince.setOnItemSelectedListener(new

AdapterView.OnItemSelectedListener()

{

@Override

public

void

onItemSelected(AdapterView<?>

parent,

View

view,

int

position,

long

id)

{

provincePosition

=

position;

provinceName

=

provinceList.get(position);

//

获取当前省份对应的城市list

cityList.clear();

List<Province.CityBean>

cityBeans

=

provinces.get(position).getCity();

for

(Province.CityBean

city

:

cityBeans)

{

cityList.add(city.getName());

}

//

刷新城市列表

spCity.setSelection(0);

cityName

=

cityList.get(0);

cityAdapter.notifyDataSetChanged();

//

刷新城区列表

updateArea(0);

}

@Override

public

void

onNothingSelected(AdapterView<?>

parent)

{

}

});

//

显示城市数据

spCity.setAdapter(cityAdapter

=

new

ArrayAdapter<String>(this,

android.R.layout.simple_spinner_item,

cityList));

spCity.setOnItemSelectedListener(new

AdapterView.OnItemSelectedListener()

{

@Override

public

void

onItemSelected(AdapterView<?>

parent,

View

view,

int

position,

long

id)

{

cityPosition

=

position;

cityName

=

cityList.get(position);

//

刷新城区列表

updateArea(position);

}

@Override

public

void

onNothingSelected(AdapterView<?>

parent)

{

}

});

//

显示城区数据

spArea.setAdapter(areaAdapter

=

new

ArrayAdapter<String>(this,

android.R.layout.simple_spinner_item,

areaList));

spArea.setOnItemSelectedListener(new

AdapterView.OnItemSelectedListener()

{

@Override

public

void

onItemS