我们在开发APP的时候，经常会遇到需要填写地址信息的情况。废话不多说，按照以下步骤实现三级地址的自动填写
第一步：从网上下载一个三级地址的json文件，放入Android Studio项目的assets文件夹下。json文件的内容如下所示（以北京为例）
"area": "010",
"cities": [
{
"area": "010",
"cities": [ ],
"code": "110101",
"level": 2,
"name": "东城区",
"prefix": "区"
},
{
"area": "010",
"cities": [ ],
"code": "110102",
"level": 2,
"name": "西城区",
"prefix": "区"
},
{
"area": "010",
"cities": [ ],
"code": "110105",
"level": 2,
"name": "朝阳区",
"prefix": "区"
},
{
"area": "010",
"cities": [ ],
"code": "110106",
"level": 2,
"name": "丰台区",
"prefix": "区"
},
{
"area": "010",
"cities": [ ],
"code": "110107",
"level": 2,
"name": "石景山区",
"prefix": "区"
},
{
"area": "010",
"cities": [ ],
"code": "110108",
"level": 2,
"name": "海淀区",
"prefix": "区"
},
{
"area": "010",
"cities": [ ],
"code": "110109",
"level": 2,
"name": "门头沟区",
"prefix": "区"
},
{
"area": "010",
"cities": [ ],
"code": "110111",
"level": 2,
"name": "房山区",
"prefix": "区"
},
{
"area": "010",
"cities": [ ],
"code": "110112",
"level": 2,
"name": "通州区",
"prefix": "区"
},
{
"area": "010",
"cities": [ ],
"code": "110113",
"level": 2,
"name": "顺义区",
"prefix": "区"
},
{
"area": "010",
"cities": [ ],
"code": "110114",
"level": 2,
"name": "昌平区",
"prefix": "区"
},
{
"area": "010",
"cities": [ ],
"code": "110115",
"level": 2,
"name": "大兴区",
"prefix": "区"
},
{
"area": "010",
"cities": [ ],
"code": "110116",
"level": 2,
"name": "怀柔区",
"prefix": "区"
},
{
"area": "010",
"cities": [ ],
"code": "110117",
"level": 2,
"name": "平谷区",
"prefix": "区"
},
{
"area": "010",
"cities": [ ],
"code": "110228",
"level": 2,
"name": "密云县",
"prefix": "区"
},
{
"area": "010",
"cities": [ ],
"code": "110229",
"level": 2,
"name": "延庆县",
"prefix": "区"
}
],
"code": "110000",
"level": 1,
"name": "北京市",
"prefix": "市"
第二步：根据自己的需要，创建一个java bean类，用来存放城市信息。
public class CityInfo {
//城市代码
private String code;
//城市名称
private String name;
//城市的下级城市
private String cities;
public CityInfo(String cities, String code, String name) {
this.cities = cities;
this.code = code;
this.name = name;
}
public String getCities() {
return cities;
}
public String getCode() {
return code;
}
public String getName() {
return name;
}
}
第三步：提取json文件当中的内容
//将json文件转为String类型
public static String getJson(Context context) {
StringBuilder stringBuilder = new StringBuilder();
try {
BufferedReader bf = new BufferedReader(new InputStreamReader(
context.getAssets().open(CityEntry.FILE_NAME)));
String line;
while ((line = bf.readLine()) != null) {
stringBuilder.append(line);
}
} catch (IOException e) {
e.printStackTrace();
}
return stringBuilder.toString();
}
/**
* 将JSON字符串转化为Adapter数据
*
* @param str
*/
public static List<CityInfo> setData(String str) {
List<CityInfo> data = new ArrayList<>();
try {
JSONArray array = new JSONArray(str);
int len = array.length();
for (int i = 0; i < len; i++) {
JSONObject object = array.getJSONObject(i);
if ((object.has(CityEntry.KEY_CITY)) &&
(object.has(CityEntry.KEY_NAME)) &&
(object.has(CityEntry.KEY_CODE))) {
data.add(new CityInfo(
object.getString(CityEntry.KEY_CITY),
object.getString(CityEntry.KEY_CODE),
object.getString(CityEntry.KEY_NAME)));
}
}
} catch (JSONException e) {
e.printStackTrace();
}
return data;
}
private static class CityEntry {
//json文件的文件名
private static final String FILE_NAME = "city_code.json";
//根据项目所需的键值
private static final String KEY_CODE = "code";
private static final String KEY_NAME = "name";
private static final String KEY_CITY = "cities";
}
最后，将setData返回的list作为adapter的参数即可显示城市信息了。
json文件可以去网上下载，如有需要可以留下邮箱。
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