类似这样的格式

public class GetJsonDataUtil {public String getJson(Context context, String fileName) {StringBuilder stringBuilder = new StringBuilder();try {AssetManager assetManager = context.getAssets();BufferedReader bf = new BufferedReader(new InputStreamReader(assetManager.open(fileName)));String line;while ((line = bf.readLine()) != null) {stringBuilder.append(line);}} catch (IOException e) {e.printStackTrace();}return stringBuilder.toString();}
}

   List<String> list = new ArrayList<>();String JsonData = new GetJsonDataUtil().getJson(this, "emoji.json");//获取assets目录下的json文件数据try {JSONObject jsonObject = new JSONObject(JsonData);Iterator<String> keys = jsonObject.keys();while(keys.hasNext()){//next()返回的数据是Object型，需要强制转化String info = (String)keys.next();//输出遍历的每一个元素JSONArray jsonArray = jsonObject.optJSONArray(info);for (int i = 0; i < jsonArray.length(); i++) {String string = jsonArray.getString(i);list.add(string);}}} catch (JSONException e) {e.printStackTrace();}MyAdapter myAdapter = new MyAdapter(R.layout.item, list);RecyclerView rv = findViewById(R.id.rv);rv.setLayoutManager(new LinearLayoutManager(MainActivity.this));rv.setAdapter(myAdapter);

public class MyAdapter extends BaseQuickAdapter<String, BaseViewHolder> {public MyAdapter(int layoutResId, @Nullable List<String> data) {super(layoutResId, data);}@Overrideprotected void convert(@NotNull BaseViewHolder baseViewHolder, String s) {SpanUtils.with((TextView) baseViewHolder.getView(R.id.tv)).append("第一个").setFontSize(20,true).append(s).setFontSize(20+baseViewHolder.getAdapterPosition()%20,true).append("第"+baseViewHolder.getAdapterPosition()+"个").create();}
}

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类似的json文件引用..

省市区文件

JsonBean

public class JsonBean implements IPickerViewData {/*** name : 省份* city : [{"name":"北京市","area":["东城区","西城区","崇文区","宣武区","朝阳区"]}]*/private String name;private List<CityBean> city;public String getName() {return name;}public void setName(String name) {this.name = name;}public List<CityBean> getCityList() {return city;}public void setCityList(List<CityBean> city) {this.city = city;}// 实现 IPickerViewData 接口，// 这个用来显示在PickerView上面的字符串，// PickerView会通过IPickerViewData获取getPickerViewText方法显示出来。@Overridepublic String getPickerViewText() {return this.name;}public static class CityBean {/*** name : 城市* area : ["东城区","西城区","崇文区","昌平区"]*/private String name;private List<String> area;public String getName() {return name;}public void setName(String name) {this.name = name;}public List<String> getArea() {return area;}public void setArea(List<String> area) {this.area = area;}}
}

public ArrayList<JsonBean> parseData(String result) {//Gson 解析ArrayList<JsonBean> detail = new ArrayList<>();try {JSONArray data = new JSONArray(result);Gson gson = new Gson();for (int i = 0; i < data.length(); i++) {JsonBean entity = gson.fromJson(data.optJSONObject(i).toString(), JsonBean.class);detail.add(entity);}} catch (Exception e) {e.printStackTrace();}return detail;}

 String JsonData = new GetJsonDataUtil().getJson(this, "province.json");//获取assets目录下的json文件数据ArrayList<JsonBean> jsonBean = parseData(JsonData);//用Gson 转成实体

 

for (int i = 0; i < jsonBean.size(); i++) {//遍历省份ArrayList<String> cityList = new ArrayList<>();//该省的城市列表（第二级）ArrayList<ArrayList<String>> province_AreaList = new ArrayList<>();//该省的所有地区列表（第三极）for (int c = 0; c < jsonBean.get(i).getCityList().size(); c++) {//遍历该省份的所有城市String cityName = jsonBean.get(i).getCityList().get(c).getName();cityList.add(cityName);//添加城市ArrayList<String> city_AreaList = new ArrayList<>();//该城市的所有地区列表//如果无地区数据，建议添加空字符串，防止数据为null 导致三个选项长度不匹配造成崩溃/*if (jsonBean.get(i).getCityList().get(c).getArea() == null|| jsonBean.get(i).getCityList().get(c).getArea().size() == 0) {city_AreaList.add("");} else {city_AreaList.addAll(jsonBean.get(i).getCityList().get(c).getArea());}*/city_AreaList.addAll(jsonBean.get(i).getCityList().get(c).getArea());province_AreaList.add(city_AreaList);//添加该省所有地区数据}/*** 添加城市数据*/options2Items.add(cityList);/*** 添加地区数据*/options3Items.add(province_AreaList);