android wheelview实现三级城市选择

很早之前看淘宝就有了ios那种的城市选择控件，当时也看到网友有分享，不过那个写的很烂，后来（大概是去年吧），我们公司有这么一个项目，当时用的还是网上比较流行的那个黑框的那个，感觉特别的丑，然后我在那个开源的wheelview的基础上做封装，用户只需要专心数据的组装即可，然后填充就行，其他的可以不必考虑。

先上下效果图

接下来说下我的思路：网络请求-数据返回-设置数据-数据填充控件

接下来直接按上面的流程直接上代码：

网络请求我用的本地的json数据

 String address = Utils.readAssert(this, "address.txt");
        AddressModel model = JsonUtil.parseJson(address, AddressModel.class);

然后我们将本地的数据通过InputStream转换为String，并用过Gson将String映射到Model对象中

<span style="font-size:18px;"> public static String readAssert(Context context,  String fileName){
        String jsonString="";
        String resultString="";
        try {
            InputStream inputStream=context.getResources().getAssets().open(fileName);
            byte[] buffer=new byte[inputStream.available()];
            inputStream.read(buffer);
            resultString=new String(buffer,"utf-8");
        } catch (Exception e) {
            e.printStackTrace();
        }
        return resultString;
    }</span>

接下来我们写自定义的Popwindos实现选择城市的弹框

<span style="font-size:18px;">public class ChooseAddressWheel implements MyOnWheelChangedListener {

    @Bind(R.id.province_wheel)
    MyWheelView provinceWheel;
    @Bind(R.id.city_wheel)
    MyWheelView cityWheel;
    @Bind(R.id.district_wheel)
    MyWheelView districtWheel;

    private Activity context;
    private View parentView;
    private PopupWindow popupWindow = null;
    private WindowManager.LayoutParams layoutParams = null;
    private LayoutInflater layoutInflater = null;

    private List<AddressDtailsEntity.ProvinceEntity> province = null;

    private OnAddressChangeListener onAddressChangeListener = null;

    public ChooseAddressWheel(Activity context) {
        this.context = context;
        init();
    }

    private void init() {
        layoutParams = context.getWindow().getAttributes();
        layoutInflater = context.getLayoutInflater();
        initView();
        initPopupWindow();
    }

    private void initView() {
        parentView = layoutInflater.inflate(R.layout.choose_city_layout, null);
        ButterKnife.bind(this, parentView);

        provinceWheel.setVisibleItems(7);
        cityWheel.setVisibleItems(7);
        districtWheel.setVisibleItems(7);

        provinceWheel.addChangingListener(this);
        cityWheel.addChangingListener(this);
        districtWheel.addChangingListener(this);
    }

    private void initPopupWindow() {
        popupWindow = new PopupWindow(parentView, WindowManager.LayoutParams.MATCH_PARENT, (int) (Utils.getScreenHeight(context) * (2.0 / 5)));
        popupWindow.setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_ADJUST_RESIZE);
        popupWindow.setAnimationStyle(R.style.anim_push_bottom);
        popupWindow.setBackgroundDrawable(new BitmapDrawable());
        popupWindow.setOutsideTouchable(false);
        popupWindow.setFocusable(true);
        popupWindow.setOnDismissListener(new PopupWindow.OnDismissListener() {
            public void onDismiss() {
                layoutParams.alpha = 1.0f;
                context.getWindow().setAttributes(layoutParams);
                popupWindow.dismiss();
            }
        });
    }

    private void bindData() {
        provinceWheel.setViewAdapter(new ProvinceWheelAdapter(context, province));
        updateCitiy();
        updateDistrict();
    }

    @Override
    public void onChanged(MyWheelView wheel, int oldValue, int newValue) {
        if (wheel == provinceWheel) {
            updateCitiy();//省份改变后城市和地区联动
        } else if (wheel == cityWheel) {
            updateDistrict();//城市改变后地区联动
        } else if (wheel == districtWheel) {
        }
    }

    private void updateCitiy() {
        int index = provinceWheel.getCurrentItem();
        List<AddressDtailsEntity.ProvinceEntity.CityEntity> citys = province.get(index).City;
        if (citys != null && citys.size() > 0) {
            cityWheel.setViewAdapter(new CityWheelAdapter(context, citys));
            cityWheel.setCurrentItem(0);
            updateDistrict();
        }
    }

    private void updateDistrict() {
        int provinceIndex = provinceWheel.getCurrentItem();
        List<ProvinceEntity.CityEntity> citys = province.get(provinceIndex).City;
        int cityIndex = cityWheel.getCurrentItem();
        List<ProvinceEntity.AreaEntity> districts = citys.get(cityIndex).Area;
        if (districts != null && districts.size() > 0) {
            districtWheel.setViewAdapter(new AreaWheelAdapter(context, districts));
            districtWheel.setCurrentItem(0);
        }

    }

    public void show(View v) {
        layoutParams.alpha = 0.6f;
        context.getWindow().setAttributes(layoutParams);
        popupWindow.showAtLocation(v, Gravity.BOTTOM, 0, 0);
    }

    public void setProvince(List<ProvinceEntity> province) {
        this.province = province;
        bindData();
    }

    public void defaultValue(String provinceStr, String city, String arae) {
        if (TextUtils.isEmpty(provinceStr)) return;
        for (int i = 0; i < province.size(); i++) {
            ProvinceEntity provinces = province.get(i);
            if (provinces != null && provinces.Name.equalsIgnoreCase(provinceStr)) {
                provinceWheel.setCurrentItem(i);
                if (TextUtils.isEmpty(city)) return;
                List<ProvinceEntity.CityEntity> citys = provinces.City;
                for (int j = 0; j < citys.size(); j++) {
                    ProvinceEntity.CityEntity cityEntity = citys.get(j);
                    if (cityEntity != null && cityEntity.Name.equalsIgnoreCase(city)) {
                        cityWheel.setViewAdapter(new CityWheelAdapter(context, citys));
                        cityWheel.setCurrentItem(j);
                        if (TextUtils.isEmpty(arae)) return;
                        List<ProvinceEntity.AreaEntity> areas = cityEntity.Area;
                        for (int k = 0; k < areas.size(); k++) {
                            ProvinceEntity.AreaEntity areaEntity = areas.get(k);
                            if (areaEntity != null && areaEntity.Name.equalsIgnoreCase(arae)) {
                                districtWheel.setViewAdapter(new AreaWheelAdapter(context, areas));
                                districtWheel.setCurrentItem(k);
                            }
                        }
                    }
                }
            }
        }
    }

    @OnClick(R.id.confirm_button)
    public void confirm() {
        if (onAddressChangeListener != null) {
            int provinceIndex = provinceWheel.getCurrentItem();
            int cityIndex = cityWheel.getCurrentItem();
            int areaIndex = districtWheel.getCurrentItem();

            String provinceName = null, cityName = null, areaName = null;

            List<ProvinceEntity.CityEntity> citys = null;
            if (province != null && province.size() > provinceIndex) {
                ProvinceEntity provinceEntity = province.get(provinceIndex);
                citys = provinceEntity.City;
                provinceName = provinceEntity.Name;
            }
            List<ProvinceEntity.AreaEntity> districts = null;
            if (citys != null && citys.size() > cityIndex) {
                ProvinceEntity.CityEntity cityEntity = citys.get(cityIndex);
                districts = cityEntity.Area;
                cityName = cityEntity.Name;
            }

            if (districts != null && districts.size() > areaIndex) {
                ProvinceEntity.AreaEntity areaEntity = districts.get(areaIndex);
                areaName = areaEntity.Name;
            }

            onAddressChangeListener.onAddressChange(provinceName, cityName, areaName);
        }
        cancel();
    }

    @OnClick(R.id.cancel_button)
    public void cancel() {
        popupWindow.dismiss();
    }

    public void setOnAddressChangeListener(OnAddressChangeListener onAddressChangeListener) {
        this.onAddressChangeListener = onAddressChangeListener;
    }</span>

然后通过三个Adapter去设置值，这里展示一个

<span style="font-size:18px;">public class ProvinceWheelAdapter extends BaseWheelAdapter<AddressDtailsEntity.ProvinceEntity> {
	public ProvinceWheelAdapter(Context context, List<AddressDtailsEntity.ProvinceEntity> list) {
		super(context,list);
	}

	@Override
	protected CharSequence getItemText(int index) {
		AddressDtailsEntity.ProvinceEntity data = getItemData(index);
		if(data != null){
			return data.Name;
		}
		return null;
	}
}</span>

我们先初始化：

<span style="font-size:18px;">private void init() {
        initWheel();
        initData();
    }</span>

 <span style="font-size:18px;">private void initWheel() {
        chooseAddressWheel = new ChooseAddressWheel(this);
        chooseAddressWheel.setOnAddressChangeListener(this);
    }</span>

<span style="font-size:18px;">private void initData() {
        String address = Utils.readAssert(this, "address.txt");
        AddressModel model = JsonUtil.parseJson(address, AddressModel.class);
        if (model != null) {
            AddressDtailsEntity data = model.Result;
            if (data == null) return;
            chooseAddress.setText(data.Province + " " + data.City + " " + data.Area);
            if (data.ProvinceItems != null && data.ProvinceItems.Province != null) {
                chooseAddressWheel.setProvince(data.ProvinceItems.Province);
                chooseAddressWheel.defaultValue(data.Province, data.City, data.Area);
            }
        }
    }</span>