轻松实现Android仿淘宝地区选择功能

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); }

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;  } }

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;  } }}