全國省市區三級聯動

PickerView

需要assets文件夾存放全國省市區json數據

MainActivity

public class MainActivity extends AppCompatActivity {

    private OptionsPickerView<String> optionsPickerView;
    
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        initData();
    }

    private List<String> provinceList = new ArrayList<>();//省
    private List<List<String>> cityList = new ArrayList<>();//市
    private List<List<List<String>>> areaList = new ArrayList<>();//區

    //省市區三級聯動
    private void initOptionsPickerView() {
        //異步讀取json串
        new Thread() {
            @Override
            public void run() {
                super.run();
                //讀取數據
                initData();
            }
        }.start();
        optionsPickerView = new OptionsPickerBuilder(this, new OnOptionsSelectListener() {
            @Override
            public void onOptionsSelect(int options1, int options2, int options3, View v) {
            }
        }).setCancelText("取消").setSubmitText("確認").build();

        optionsPickerView.setPicker(provinceList, cityList, areaList);
    }

    private void initData() {
        StringBuilder builder = new StringBuilder();
        AssetManager assets = getAssets();
        try {
            BufferedReader bf = new BufferedReader(new InputStreamReader(assets.open("province.json")));
            String line;
            while ((line = bf.readLine()) != null) {
                builder.append(line);
            }
        } catch (IOException e) {
            e.printStackTrace();
        }

        //json---->對象
        List<JsonBean> jsonBeanList = new Gson().fromJson(builder.toString(), new TypeToken<List<JsonBean>>() {
        }.getType());
        builder.setLength(0);

        //整理三個list
        for (JsonBean bean :
                jsonBeanList) {
            provinceList.add(bean.getName());
            List<String> citys = new ArrayList<>();
            List<List<String>> areas = new ArrayList<>();
            for (JsonBean.CityBean cityBean :
                    bean.getCity()) {
                citys.add(cityBean.getName());
                areas.add(cityBean.getArea());
            }
            cityList.add(citys);
            areaList.add(areas);
        }
        runOnUiThread(new Runnable() {
            @Override
            public void run() {
                initOptionsPickerView();
            }
        });

    }
}