最近的一個專案因為android端與IOS端需要同步，所以在城市選擇器這裡做了一個類似IOS的CityPicker控制元件，當然因為本人水平問題顯示效果比IOS上面還是有一定差距的，OK先讓大家看下效果。

因為專案中是一個兩級連選，所以這個DEMO只用也就沒有放上縣級的資料，如果有需要實現三級連選的朋友，可以參照程式碼加上就行了。

內部使用的WheelView控制元件來自https://github.com/wangjiegulu/WheelView，在他的基礎上進行和一些修改了備註，使他更適合於進行3級的城市連選，需要的朋友可以下載下來看一下。
附上部分程式碼片段。

資料的獲取,所有的資料來自於CityManage物件，
public
 
 class CityManage {

    private SQLiteDatabase database;

    public CityManage(Context context){
        database = CityDatabase.openDatabase(context);

    }

    /**
     * 獲取所有的省市名稱
     */
    public List<String> getAllNames(){
        List<String> result = new ArrayList<>();

        Cursor cursor = database.query("region"
 
,new String[]{"name"},null,null,null,null,null);

        while (cursor.moveToNext()){
                result.add(cursor.getString(0));

        }

        return result;
    }

    /**
     * 獲取所有省的名稱
     */
    public List<String> getProvinceNames(){
        List<String> result = new ArrayList<>();

        Cursor cursor = database.query("region"
 
,new String[]{"name"},"parent_id = 1",null,null,null,null,null);

        while (cursor.moveToNext()){
            result.add(cursor.getString(0));

        }

        return result;
    }

    /**
     * 根據省市的ID獲取省市的名稱
     */
    public String getProvinceNameFromProvinceId(String provinceId){
        String result = "找不到桑";
        Cursor cursor = database.query("region",new String[]{"name"},"region_id = ?",new String[]{provinceId},null,null,null,null);
        while (cursor.moveToNext()){
            result = cursor.getString(0);

        }

        return result;
    }

    /**
     * 根據省市的名稱獲取省市的ID
     */
    public String getProvinceIdFromProvinceName(String provinceName){
        String result = "找不到桑";
        Cursor cursor = database.query("region",new String[]{"region_id"},"name = ?",new String[]{provinceName},null,null,null,null);
        while (cursor.moveToNext()){
            result = cursor.getString(0);

        }

        return result;
    }

    /**
     * 根據省的ID獲取它包含的所有市的名稱
     */
    public List<String> getCityNameFromProvinceId(String provinceId){
        List<String> result = new ArrayList<>();

        Cursor cursor = database.query("region",new String[]{"name"},"parent_id = ?",new String[]{provinceId},null,null,null,null);

        while (cursor.moveToNext()){
            result.add(cursor.getString(0));

        }

        return result;
    }

    /**
     * 根據省的ID獲取它包含的所有市的模型
     */
    public List<CityModel> getCityModelFromProvinceId(String provinceId){
        List<CityModel> result = new ArrayList<>();

        Cursor cursor = database.query("region",null,"parent_id = ?",new String[]{provinceId},null,null,null,null);

        while (cursor.moveToNext()){
            CityModel cityModel = new CityModel();

            //城市ID
            int indexId = cursor.getColumnIndex("region_id");
            cityModel.setCityId(cursor.getString(indexId));

            //城市名
            int indexCityName = cursor.getColumnIndex("name");
            cityModel.setCityName(cursor.getString(indexCityName));

            //所屬省ID
            int indexProvinceId = cursor.getColumnIndex("parent_id");
            cityModel.setProvinceId(cursor.getString(indexProvinceId));

            //所屬省名稱
            cityModel.setProvinceName(getProvinceNameFromProvinceId(cityModel.getProvinceId()));

            result.add(cityModel);

        }

        return result;
    }

    /**
     * 根據省市的ID獲取省市的模型
     */
    public CityModel getCityModelFormCityId(String cityId){
        CityModel result = new CityModel();

        Cursor cursor = database.query("region",null,"region_id = ?",new String[]{cityId},null,null,null,null);

        while (cursor.moveToNext()){
            //城市ID
            int indexId = cursor.getColumnIndex("region_id");
            result.setCityId(cursor.getString(indexId));

            //城市名
            int indexCityName = cursor.getColumnIndex("name");
            result.setCityName(cursor.getString(indexCityName));

            //所屬省ID
            int indexProvinceId = cursor.getColumnIndex("parent_id");
            result.setProvinceId(cursor.getString(indexProvinceId));

            //所屬省名稱
            result.setProvinceName(getProvinceNameFromProvinceId(result.getProvinceId()));
        }

        return result;
    }

    /**
     * 根據省市的名稱獲取省市的模型
     */
    public CityModel getCityModelFormCityName(String cityName){
        CityModel result = new CityModel();

        Cursor cursor = database.query("region",null,"name = ?",new String[]{cityName},null,null,null,null);

        while (cursor.moveToNext()){
            //城市ID
            int indexId = cursor.getColumnIndex("region_id");
            result.setCityId(cursor.getString(indexId));

            //城市名
            int indexCityName = cursor.getColumnIndex("name");
            result.setCityName(cursor.getString(indexCityName));

            //所屬省ID
            int indexProvinceId = cursor.getColumnIndex("parent_id");
            result.setProvinceId(cursor.getString(indexProvinceId));

            //所屬省名稱
            result.setProvinceName(getProvinceNameFromProvinceId(result.getProvinceId()));
        }

        return result;
    }

}

連選關鍵
 wvProvince.setOnWheelViewListener(new WheelView.OnWheelViewListener(){
            @Override
            public void onSelected(int selectedIndex, String item) {
                super.onSelected(selectedIndex, item);

                //重新初始化城市資料
                cityList = cityManage.getCityNameFromProvinceId(cityManage.getProvinceIdFromProvinceName(item));
                //替換顯示資料
                wvCity.replace(cityList);
                wvCity.setSeletion(0);
            }
        });

對這個有興趣的朋友把原始碼下載下來看一下。

站在巨人的肩膀上，我們才能看得更遠