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
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”,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",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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