android地区三级联动选择

Myth丶恋晨 2022-07-14 13:15 225阅读 0赞

地区三级联动选择
    一个Activity 2个Fragment， 在Activity中一次添加Fragment显示省级、市级、县级的列表。

Activity 根布局为FrameLayout,其中显示一个省级的RecyclerView的列表，在第一个省级列表RecyclerView的adapter中的点击加入市级的第一个Fragment
    在市级的第一个Fragment的RecylerView的adapter中点击加入县级第二个Fragment，县级第二个Fragment的RecyclerView显示县级数据，选择结果记录，AreaBean对象从第一个activity的省级adapter传到第一个fragment在到adapter市级，

再入第二个Fraggment的adapter 点击保存返回数据，然后结束当前的Fragment和Activity。

第一个省级activity:

public class SelectProvince extends AppCompatActivity {
        @BindView(R.id.province_list)
        RecyclerView province_select;
        private RecyclerView.LayoutManager manager;
        private Province_adapter adapter;
        private CityBean cityBean;
    
        //用handler获取子线程的数据
        private Handler handler = new Handler(){
            @Override
            public void handleMessage(Message msg) {
                super.handleMessage(msg);
                cityBean = (CityBean) msg.obj;
                //获得数据
                adapter = new Province_adapter(SelectProvince.this,cityBean.getData());
                adapter.setAreaBean(new AreaBean());
                province_select.setAdapter(adapter);
            }
        };
    
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_select_area);
            ButterKnife.bind(this);
            manager = new LinearLayoutManager(this);
            province_select.setLayoutManager(manager);
            province_select.setHasFixedSize(true);
            GetJsonToObject();
        }
    
    
        /*
         *解析JSon
         */
        private void GetJsonToObject(){
            new Thread(new Runnable() {
                @Override
                public void run() {
                    System.out.println("sadafas");
                    Gson gson = new Gson();
                    //传出数据
                    Message message = Message.obtain();
                    message.obj = gson.fromJson(getJson("ChinaCites.json"),CityBean.class);
                    handler.sendMessage(message);
    
                }
            }).start();
        }
        /*
         *获得Json
         */
        public String getJson(String fileName) {
    
            StringBuilder stringBuilder = new StringBuilder();
            try {
                AssetManager assetManager = this.getAssets();
                BufferedReader bf = new BufferedReader(new InputStreamReader(
                        assetManager.open(fileName)));
                String line;
                while ((line = bf.readLine()) != null) {
                    stringBuilder.append(line);
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
            return stringBuilder.toString();
        }
        
      /*
         *返回和销毁fragment
         */
        private void BackFragment(){
            if (getSupportFragmentManager().getBackStackEntryCount() == 0){
                     //必须先setResult
                setResult(0x123,null);
                finish();
            }else {
                getSupportFragmentManager().popBackStack();
            }
        } 
        } 
    
    
    布局:
     
     <?xml version="1.0" encoding="utf-8"?>
    <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:tools="http://schemas.android.com/tools"
        android:id="@+id/activity_select_area"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        tools:context=".SelectProvince">
        <android.support.v7.widget.RecyclerView
            android:id="@+id/province_list"
            android:layout_width="match_parent"
            android:layout_height="match_parent">
        </android.support.v7.widget.RecyclerView>
    </FrameLayout>
     
    市级Fragment： 
     public class SelectCity extends Fragment {
        @BindView(R.id.city_list)
        RecyclerView city_select;
        private RecyclerView.LayoutManager manager;
        private City_adapter adapter;
        List<CityBean.Data.City> list;
        private AppCompatActivity compatActivity;
        private AreaBean areaBean;
    
        public void setAreaBean(AreaBean areaBean) {
            this.areaBean = areaBean;
        }
    
        public AreaBean getAreaBean() {
            return areaBean;
        }
    
        public SelectCity(AppCompatActivity activity, List<CityBean.Data.City> list) {
                 this.list = list;
            this.compatActivity = activity;
        }
    
        @Override
        public View onCreateView(LayoutInflater inflater, ViewGroup container,
                                 Bundle savedInstanceState) {
            View rootview = inflater.inflate(R.layout.fragment_select_city, container, false);
            ButterKnife.bind(this,rootview);
            manager = new LinearLayoutManager(rootview.getContext());
            city_select.setLayoutManager(manager);
            city_select.setHasFixedSize(true);
            adapter = new City_adapter(compatActivity,list);
            //传递选择的省份
            adapter.setAreaBean(getAreaBean());
            city_select.setAdapter(adapter);
            return rootview;
        }
    
        @Override
        public void onDestroy() {
            super.onDestroy();
            //System.out.println("city");
        }
    } 
    布局： 
     <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:tools="http://schemas.android.com/tools"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="@color/SystemWhite">
        <android.support.v7.widget.RecyclerView
            android:id="@+id/city_list"
            android:layout_width="match_parent"
            android:layout_height="match_parent">
        </android.support.v7.widget.RecyclerView>
    
    </FrameLayout>
     
    
     
     县级Fragment: public class SelectCounty extends Fragment {
        @BindView(R.id.county_list)
        RecyclerView county_select;
        private RecyclerView.LayoutManager manager;
        private County_adapter adapter;
        private List<String> county;
        private AreaBean areaBean;
    
        public void setAreaBean(AreaBean areaBean) {
            this.areaBean = areaBean;
        }
    
        public AreaBean getAreaBean() {
            return areaBean;
        }
    
        private AppCompatActivity compatActivity;
        public SelectCounty(AppCompatActivity activity,List<String> county) {
            this.county = county;
            this.compatActivity = activity;
        }
    
        @Override
        public View onCreateView(LayoutInflater inflater, ViewGroup container,
                                 Bundle savedInstanceState) {
            View rootview = inflater.inflate(R.layout.fragment_select_county, container, false);
            ButterKnife.bind(this,rootview);
            manager = new LinearLayoutManager(rootview.getContext());
            county_select.setLayoutManager(manager);
            county_select.setHasFixedSize(true);
            adapter = new County_adapter(compatActivity,county);
            adapter.setAreaBean(getAreaBean());
            county_select.setAdapter(adapter);
            return rootview;
        }
    
        @Override
        public void onDestroy() {
            super.onDestroy();
            //System.out.println("conuty");
        }
    } 
    布局： <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:tools="http://schemas.android.com/tools"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="@color/SystemWhite">
        <android.support.v7.widget.RecyclerView
            android:id="@+id/county_list"
            android:layout_width="match_parent"
            android:layout_height="match_parent">
        </android.support.v7.widget.RecyclerView>
    
    </FrameLayout>
     
     省级adapter: public class Province_adapter extends RecyclerView.Adapter<Province_adapter.MyHolder> {
        private List<CityBean.Data> list;
        private AppCompatActivity compatActivity;
        private AreaBean areaBean;
    
        public void setAreaBean(AreaBean areaBean) {
            this.areaBean = areaBean;
        }
    
        public AreaBean getAreaBean() {
            return areaBean;
        }
    
        public Province_adapter(AppCompatActivity compatActivity, List<CityBean.Data> list){
            this.list = list;
            this.compatActivity = compatActivity;
        }
    
        @Override
        public MyHolder onCreateViewHolder(ViewGroup parent, int viewType) {
            View rootview = LayoutInflater.from(parent.getContext()).inflate(R.layout.item_area,null);
            MyHolder holder = new MyHolder(rootview);
    
            return holder;
        }
    
        @Override
        public void onBindViewHolder(MyHolder holder, final int position) {
            holder.area_text.setText(list.get(position).getName());
            holder.area_text.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    //跳到城市
                    getAreaBean().setmProvince(list.get(position).getName());
                    addFrament(compatActivity,list.get(position).getCity());
    
                }
            });
        }
    
        @Override
        public int getItemCount() {
            return list.size();
        }
    
        public static class MyHolder extends RecyclerView.ViewHolder{
            @BindView(R.id.area_text)
            TextView area_text;
            public MyHolder(View itemView) {
                super(itemView);
                ButterKnife.bind(this,itemView);
            }
        }
    
        private void addFrament(AppCompatActivity activity, List<CityBean.Data.City> list){
            SelectCity selectCity = new SelectCity(activity,list);
            //传递结果
            selectCity.setAreaBean(getAreaBean());
    
            FragmentManager manager = activity.getSupportFragmentManager();
            FragmentTransaction transaction = manager.beginTransaction();
            transaction.add(R.id.activity_select_area, selectCity,list.toString());
            transaction.addToBackStack(list.toString());
            transaction.commit();
        }
    
    
    }
     
     市级adapter: public class City_adapter extends RecyclerView.Adapter<City_adapter.MyHolder> {
        private List<CityBean.Data.City> list;
        private AppCompatActivity compatActivity;
        private AreaBean areaBean;
    
        public void setAreaBean(AreaBean areaBean) {
            this.areaBean = areaBean;
        }
    
        public AreaBean getAreaBean() {
            return areaBean;
        }
    
        public City_adapter(AppCompatActivity compatActivity, List<CityBean.Data.City> list){
                   this.list = list;
            this.compatActivity = compatActivity;
        }
    
        @Override
        public MyHolder onCreateViewHolder(ViewGroup parent, int viewType) {
            View rootview = LayoutInflater.from(parent.getContext()).inflate(R.layout.item_area,null);
            MyHolder holder = new MyHolder(rootview);
            return holder;
        }
    
        @Override
        public void onBindViewHolder(MyHolder holder, final int position) {
            holder.area_text.setText(list.get(position).getName());
            holder.area_text.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    //跳到县区
                    getAreaBean().setmCity(list.get(position).getName());
                    addFrament(compatActivity,list.get(position).getCounty());
                }
            });
        }
    
        @Override
        public int getItemCount() {
            return list.size();
        }
    
        public static class MyHolder extends RecyclerView.ViewHolder{
            @BindView(R.id.area_text)
            TextView area_text;
            public MyHolder(View itemView) {
                super(itemView);
                ButterKnife.bind(this,itemView);
            }
        }
        private void addFrament(AppCompatActivity activity, List<String> county){
            SelectCounty selectCounty = new SelectCounty(activity,county);
            //传递城市
            selectCounty.setAreaBean(getAreaBean());
            FragmentManager manager = activity.getSupportFragmentManager();
            FragmentTransaction transaction = manager.beginTransaction();
            transaction.add(R.id.activity_select_area, selectCounty,list.toString());
            transaction.addToBackStack(list.toString());
            transaction.commit();
        }
    }
     
    县级dapter： public class County_adapter extends RecyclerView.Adapter<County_adapter.MyHolder> {
        private List<String> county;
        private AppCompatActivity compatActivity;
        private AreaBean areaBean;
    
        public void setAreaBean(AreaBean areaBean) {
            this.areaBean = areaBean;
        }
    
        public AreaBean getAreaBean() {
            return areaBean;
        }
    
        public County_adapter(AppCompatActivity compatActivity,List<String> county){
                   this.county = county;
            this.compatActivity = compatActivity;
        }
    
        @Override
        public MyHolder onCreateViewHolder(ViewGroup parent, int viewType) {
            View rootview = LayoutInflater.from(parent.getContext()).inflate(R.layout.item_area,null);
            MyHolder holder = new MyHolder(rootview);
            return holder;
        }
    
        @Override
        public void onBindViewHolder(MyHolder holder, final int position) {
            holder.area_text.setText(county.get(position));
            holder.area_text.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    //获取选择地区的结果
                    //compatActivity.setResult();
                    getAreaBean().setmCounty(county.get(position));
                    //返回结果
                    Intent intent = new Intent();
                    intent.putExtra("arearesult",getAreaBean());
                    compatActivity.setResult(0x123,intent);
                    //关闭当前activity
                    compatActivity.finish();
                }
            });
        }
    
        @Override
        public int getItemCount() {
            return county.size();
        }
    
        public static class MyHolder extends RecyclerView.ViewHolder{
            @BindView(R.id.area_text)
            TextView area_text;
            public MyHolder(View itemView) {
                super(itemView);
                ButterKnife.bind(this,itemView);
            }
        }
    }
     
    Areabean: public class AreaBean implements Serializable{
        private String mProvince;
        private String mCity;
        private String mCounty;
    
        public String getmProvince() {
            return mProvince;
        }
    
        public void setmProvince(String mProvince) {
            this.mProvince = mProvince;
        }
    
        public String getmCity() {
            return mCity;
        }
    
        public void setmCity(String mCity) {
            this.mCity = mCity;
        }
    
        public String getmCounty() {
            return mCounty;
        }
    
        public void setmCounty(String mCounty) {
            this.mCounty = mCounty;
        }
    } 
    
     Citybean: public class CityBean {
        private String note;
        private List<Data> data;
    
        public String getNote() {
            return note;
        }
        public void setNote(String note) {
            this.note = note;
        }
        public List<Data> getData() {
            return data;
        }
        public void setData(List<Data> data) {
            this.data = data;
        }
            public static class Data {
                private String name;
                private List<City> city;
    
                public String getName() {
                    return name;
                }
                public void setName(String name) {
                    this.name = name;
                }
                public List<City> getCity() {
                    return city;
                }
                public void setCity(List<City> city) {
                    this.city = city;
                }
                    public static class City {
                        private String name;
                        private List<String> county;
                        public String getName() {
                            return name;
                        }
                        public void setName(String name) {
                            this.name = name;
                        }
                        public List<String> getCounty() {
                            return county;
                        }
                        public void setCounty(List<String> county) {
                            this.county = county;
                        }
                    }
            }
    }