Android 轻松实现仿淘宝地区选择

来源：互联网发布：java 微信发送消息编辑：程序博客网时间：2024/04/25 10:11

介绍

最近用淘宝客户端的时候，编辑地址的时候有个地区选择的功能。看上面的效果觉得挺酷，滚动的时候，是最后一个从下面飞上来挨着前一个。就自己鼓捣一个出来玩玩。

说了效果可能不太直观，下面上两张图看看效果
淘宝地区选择效果

再来一张自己的效果
这里写图片描述

gif的效果可能不太好，大家自己用Android手机打开淘宝看看

实现分析

展示很简单，ListView就可以了。对于动画效果，只需要在getView的时候获取到要展示的View，通过属性动画修改translationY就ok啦。由于地区选择是一个界面，所以这里还用到了Fragment的 addToBackStack知识

1、用来展示的Fragment

用一个Fragment来接受parentCode参数来获取父地区的所有子地区，然后进行显示。这里用Fragment来做是因为用Activity的话，这样的连续点击都是同一类的界面不太适合。

public class AreaFragment extends Fragment implements AdapterView.OnItemClickListener {    private static final String ARG_PARAM1 = "parentCode";    @Bind(R.id.refresh_list_view)    ListView mRefreshListView;    @Bind(R.id.loadingBar)    ProgressBar mLoadingBar;    private String mParam1;//parentCode参数    OkHttpClient mOkHttpClient = new OkHttpClient();    private OnFragmentInteractionListener mListener;    private AreaAdapter adapter;//地区adapter    public AreaFragment() {    }    /**     * Use this factory method to create a new instance of     * this fragment using the provided parameters.     *     * @param param1 Parameter 1.     * @return A new instance of fragment AreaFragment.     */    public static AreaFragment newInstance(String param1) {        AreaFragment fragment = new AreaFragment();        Bundle args = new Bundle();        args.putString(ARG_PARAM1, param1);        fragment.setArguments(args);        return fragment;    }    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        if (getArguments() != null) {            //获取父地区的code，用来查询子地区            mParam1 = getArguments().getString(ARG_PARAM1);        }    }    @Override    public View onCreateView(LayoutInflater inflater, ViewGroup container,                             Bundle savedInstanceState) {        // Inflate the layout for this fragment        View view = inflater.inflate(R.layout.fragment_area, container, false);        ButterKnife.bind(this, view);        mRefreshListView.setOnItemClickListener(this);        FormEncodingBuilder builder = new FormEncodingBuilder();        builder.add(ARG_PARAM1,mParam1);        //通过parentCode来请求地区，如果parentCode不存在就是第一级        final Request request = new Request.Builder()                .url("http://123.184.16.19:8008/area/list")                .post(builder.build())                .build();        mOkHttpClient.newCall(request).enqueue(new Callback(){            @Override            public void onFailure(Request request, IOException e) {            }            @Override            public void onResponse(Response response) throws IOException {                final String res = response.body().string();                if (res!=null){                    Gson gson = new Gson();                    JsonResult jsonResult =  gson.fromJson(res, JsonResult.class);                    if (jsonResult.isSuccess()){                        List list = (List) jsonResult.getResult();                        List newList = new ArrayList();                        Iterator iterator = list.iterator();                        while (iterator.hasNext()){                            Map map = (Map) iterator.next();                            AreaInfo areaInfo = gson.fromJson(gson.toJson(map),AreaInfo.class);                            newList.add(areaInfo);                        }                        adapter = new AreaAdapter(getContext(),newList);                        getActivity().runOnUiThread(new Runnable() {                            @Override                            public void run() {                      //拿到数据进行展示                                mRefreshListView.setAdapter(adapter);                            }                        });                    }                }            }        });        return view;    }    @Override    public void onAttach(Context context) {        super.onAttach(context);        if (context instanceof OnFragmentInteractionListener) {            mListener = (OnFragmentInteractionListener) context;        } else {            throw new RuntimeException(context.toString()                    + " must implement OnFragmentInteractionListener");        }    }    @Override    public void onDetach() {        super.onDetach();        mListener = null;    }    @Override    public void onDestroyView() {        super.onDestroyView();        ButterKnife.unbind(this);    }    @Override    public void onItemClick(AdapterView<?> parent, View view, int position, long id) {        //单击的时候需要处理地区点击事件，统一交给Activity处理        AreaInfo areaInfo = (AreaInfo) parent.getAdapter().getItem(position);        if (areaInfo==null) return;        if (mListener!=null){            mListener.onFragmentInteraction(areaInfo);        }    }    //用来和Activity交互的回调接口    public interface OnFragmentInteractionListener {        void onFragmentInteraction(AreaInfo areaInfo);    }

我们用了一个Fragment来接受parentCode，用于请求下一级的地区，获取成功之后进行了展示。并且提供了一个OnFragmentInteractionListener用来在onItemClick时与Activity交互。

接下来看adapter,最开始我们提到了要实现淘宝的效果我们只需要拿到即将显示的View，设置动画就可以了。

2、处理显示效果的adapter

class AreaAdapter extends BaseAdapter {        private List list;        private int lastPosition;        public AreaAdapter(Context context, List<AreaInfo> list) {            this.list = list;        }        @Override        public int getCount() {            return list.size();        }        @Override        public Object getItem(int position) {            return list.get(position);        }        @Override        public long getItemId(int position) {            return 0;        }        @Override        public View getView(int position, View convertView, ViewGroup parent) {            ViewHolder viewHolder = null;            if (convertView==null){               convertView =  LayoutInflater.from(getContext()).inflate(R.layout.area_list_item,parent,false);                viewHolder = new ViewHolder();                viewHolder.textView = (TextView) convertView.findViewById(android.R.id.text1);                convertView.setTag(viewHolder);            }            viewHolder = (ViewHolder) convertView.getTag();            AreaInfo item = (AreaInfo) list.get(position);            viewHolder.textView.setText(item.getAreaName());            if (lastPosition<position&&lastPosition!=0){                ObjectAnimator.ofFloat(convertView,"translationY",convertView.getHeight()*2,0).setDuration(500).start();            }            lastPosition = position;            return convertView;        }        class ViewHolder{            TextView textView;        }    }

很常见的一个Adapter写法，只是在getView当中获取到了要显示的view，通过
ObjectAnimator.ofFloat(convertView,”translationY”,convertView.getHeight()*2,0).setDuration(500).start()为veiw设置了动画，

这里还用了个变量position来区别只有在向上滚动的时候才会有动画。不过我觉得不加position区别的效果也不错，大家可以试试。

其实这样已经实现了效果，接下来顺便提一下Activity对Framgnet中onItemClick的处理。

3、Activity和fragment的交互处理

public class AreaSelectActivity extends AppCompatActivity implements AreaFragment.OnFragmentInteractionListener{    private Fragment oneFragment;    private Fragment twoFragment;    private Map map = new HashMap();    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_area_select);        ButterKnife.bind(this);        //新建第一级地区，parentCode参数为null        oneFragment = AreaFragment.newInstance("");        FragmentManager fragmentManager = getSupportFragmentManager();        fragmentManager.beginTransaction().replace(R.id.content,oneFragment).commit();    }    @Override    public boolean onOptionsItemSelected(MenuItem item) {        switch (item.getItemId()){            case android.R.id.home:                FragmentManager fragmentManager = getSupportFragmentManager();                if (fragmentManager.getBackStackEntryCount()>0){                    fragmentManager.popBackStack();                }else{                    finish();                }                break;        }        return true;    }     /**     * 处理交互，hide前一个fragment，并且调用addToBackStack让Fragment可以点击back的时候显示前一个fragment     * 如果是第三级地区则直接返回地区选择数据给上个Activity     * @param areaInfo 被点击的地区信息     */    @Override    public void onFragmentInteraction(AreaInfo areaInfo) {        if (areaInfo==null){            return;        }        FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();        int level = areaInfo.getLevel();        switch (level){            case 1:                map.put("provId",areaInfo.getId());                map.put("provName",areaInfo.getAreaName());                if (areaInfo.isLeaf()){                    Intent intent = new Intent();                    intent.putExtra("addressInfo", (Serializable) map);                    setResult(RESULT_OK,intent);                    finish();                }else{                    transaction.hide(oneFragment);                    transaction.add(R.id.content,twoFragment=AreaFragment.newInstance(areaInfo.getAreaCode()+"")).addToBackStack(null).commit();                }                break;            case 2:                map.put("cityId",areaInfo.getId());                map.put("cityName",areaInfo.getAreaName());                if (areaInfo.isLeaf()){                    Intent intent = new Intent();                    intent.putExtra("addressInfo", (Serializable) map);                    setResult(RESULT_OK,intent);                    finish();                }else {                    transaction.hide(twoFragment);                    transaction.add (R.id.content, AreaFragment.newInstance(areaInfo.getAreaCode()+"")).addToBackStack(null).commit();                }                break;            case 3:                map.put("districtId",areaInfo.getId());                map.put("districtName",areaInfo.getAreaName());                Intent intent = new Intent();                intent.putExtra("addressInfo", (Serializable) map);                setResult(RESULT_OK,intent);                finish();                break;        }    }}

这样仿淘宝地区选择就实现啦！

结语

大家可以自己写测试接口，也可以直接调用我写好的接口：
http://123.184.16.19:8008/area/list

源码提供给大家参考:
Android仿淘宝地区选择

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