如何根据第一个微调器显示第二个微调器数据。 Json 来自 url？

Question

到目前为止，我正在获取 JSON 并将它们放入 3 个不同的微调器中。但问题是如何根据第一个微调器制作第二个微调器数据和基于第二个微调器的第三个微调器数据。

       This is my code for JSON.

            try {
            // Locate the NodeList name
            jsonarray = jsonobject.getJSONArray("results");
            for (int i = 0; i < jsonarray.length(); i++) {
                jsonobject = jsonarray.getJSONObject(i);

                Results worldpop = new Results();

                worldpop.setSyllabus(jsonobject.optString("syllabus"));
                worldpop.setGrade(jsonobject.optString("grade"));
                worldpop.setSubject(jsonobject.optString("subject"));
                //worldpop.setFlag(jsonobject.optString("flag"));
                world.add(worldpop);


                worldlist.add(jsonobject.optString("syllabus"));
                worldlist2.add(jsonobject.optString("grade"));
                worldlist3.add(jsonobject.optString("subject"));

            }
        } catch (Exception e) {
            Log.e("Error", e.getMessage());
            e.printStackTrace();
        }
        return null;
    }

    @Override
    protected void onPostExecute(Void args) {
        // Locate the spinner in activity_main.xml

        final Spinner mySpinner = (Spinner) findViewById(R.id.syllabus);
        Spinner mySpinner2 = (Spinner) findViewById(R.id.grade);
        Spinner mySpinner3 = (Spinner) findViewById(R.id.subject);

        // Spinner adapter


        LinkedHashSet<String> listToSet = new LinkedHashSet<String>(worldlist);

        //Creating Arraylist without duplicate values
        final List<String> worldlistnew = new ArrayList<String>(listToSet);




     mySpinner
                .setAdapter(new ArrayAdapter<String>(MainActivity.this,
                        android.R.layout.simple_spinner_dropdown_item,
                        worldlistnew));

        listToSet = new LinkedHashSet<String>(worldlist2);

        //Creating Arraylist without duplicate values
        final List<String> worldlistnew2 = new ArrayList<String>(listToSet);



        mySpinner2
                .setAdapter(new ArrayAdapter<String>(MainActivity.this,
                        android.R.layout.simple_spinner_dropdown_item,
                        worldlistnew2));

        listToSet = new LinkedHashSet<String>(worldlist3);

        //Creating Arraylist without duplicate values
        final List<String> worldlistnew3 = new ArrayList<String>(listToSet);
        mySpinner3
                .setAdapter(new ArrayAdapter<String>(MainActivity.this,
                        android.R.layout.simple_spinner_dropdown_item,
                        worldlistnew3));

        // Spinner on item click listener
        mySpinner
                .setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {

                    @Override
                    public void onItemSelected(AdapterView<?> arg0,
                                               View arg1, int position, long arg3) {

这里有一些事情要做。

                      //  Results population = (Results)                   mySpinner.getItemAtPosition(position);
                      //  worldlistnew2.setText("" + population.getGrade());
                       // worldlistnew3.setText("" + population.getSubject());


                    }

                    @Override
                    public void onNothingSelected(AdapterView<?> arg0) {
                        // TODO Auto-generated method stub
                    }
                });

    }
}

Answer 1

我知道，我迟到了，但这段代码正在我的项目中运行，请看一下，可能是为即将到来的人准备的。在第一个微调器单击时，您必须将 Json 数据添加到第二个微调器，与第三个微调器相同。

BetterSpinner spinnerOne, spinnerTwo;
ArrayAdapter<String> taxTypeDisAdaptor;
String taxTypeDisArray[] = {"Addition", "Discount", "Tax"};

private void setSipnnerAdaptors() {

    taxTypeDisAdaptor = new ArrayAdapter<>(mContext, R.layout.support_simple_spinner_dropdown_item, taxTypeDisArray);
    spinnerOne.setAdapter(taxTypeDisAdaptor);
    spinnerOne.setOnItemClickListener(new AdapterView.OnItemClickListener() {
        @Override
        public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
            gSttaxTypeDis = taxTypeDisArray[position];

            switch (gSttaxTypeDis) {
                case "Addition":
                    ledgertype_id = "4";
                    getLedgerData();
                    break;
                case "Tax":
                    ledgertype_id = "2";
                    getLedgerData();
                    break;
                case "Discount":
                    ledgertype_id = "3";
                    getLedgerData();
                    break;
            }
        }
    });

    spinnerTwo.setOnItemClickListener(new AdapterView.OnItemClickListener() {
        @Override
        public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
            SetterAndGetter swt = (SetterAndGetter) parent.getItemAtPosition(position);
            gSTax_Ledgerid = String.valueOf((Integer) swt.tag);

        }
    });
}

public void getLedgerData() {

    String urls = "Json url " + ledgertype_id + "";
    String keyIds = "key";
    String values = "value";
    itemListLedger = CommonSpinnerDAta.addSpinnerdata(urls, keyIds, values);

    ArrayAdapter<SetterAndGetter> adapter = new ArrayAdapter<SetterAndGetter>(mContext, R.layout.support_simple_spinner_dropdown_item, itemListLedger);
    spinnerTwo.setAdapter(adapter);

}

Answer 2

嗨 shewtabh singh 首先你需要将 json 数据存储到 hashmap 中，如下所示，在类型转换后你的第一个微调器应用集在 itemselected 侦听器上到微调器引用，而不是像这样

私有 HashMap hmBillDispute = new HashMap();

spn_DisputeBill.setOnItemSelectedListener(new OnItemSelectedListener() {

        @Override
        public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
            // TODO Auto-generated method stub
            strCustomerCode = hmBillDispute.get(spn_DisputeBill.getSelectedItem().toString());
            String strFromCustomerName = spn_DisputeBill.getSelectedItem().toString();

            if (!strFromCustomerName.equalsIgnoreCase("Customer Name")) {

                doInBackground(GET_DISPUTE_BILL_HISTORY_LIST);

            }
        }

        @Override
        public void onNothingSelected(AdapterView<?> parent) {
            // TODO Auto-generated method stub

        }
    }); 

现在您将获得基于第一个微调器项目选择的数据

Answer 3

首先您指定 json 数据格式。 我研究一种 json 数据格式，例如。

{
  "City": [
    {
      "name": "Ahmedabad",
      "City_area1" : "Ghatlodia",
      "City_area2" : "Chandlodia",
      "City_area3" : "Other"
    },
    {
      "name": "Hydarabad",
      "City_area1" : "IIT",
      "City_area2" : "Faridabad",
      "City_area3" : "Other"
    },
    {
      "name": "Noida",
      "City_area1" : "Sector-50",
      "City_area2" : "Sector-41",
      "City_area3" : "Other"
    }
  ]
}

city.java

public class city {
    private String city;
    private String Area1;
    private String Area2;
    private String Area3;

    public String getArea1() {
        return Area1;
    }

    public void setArea1(String area1) {
        Area1 = area1;
    }

    public String getArea2() {
        return Area2;
    }

    public void setArea2(String area2) {
        Area2 = area2;
    }

    public String getArea3() {
        return Area3;
    }

    public void setArea3(String area3) {
        Area3 = area3;
    }

    public city(String area1, String area2, String area3, String city) {

        Area1 = area1;
        Area2 = area2;
        Area3 = area3;
        this.city = city;
    }



    public city() {

    }

    public String getCity() {

        return city;
    }

    public void setCity(String city) {
        this.city = city;
    }
}

MainActivity.java

public class MainActivity extends Activity {
    Spinner selectcityspinner;
    ArrayList<String> citylist;
    ArrayList<city> cityandarealist;

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        return super.onCreateOptionsMenu(menu);
    }



    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        selectcityspinner = (Spinner)findViewById(R.id.selectcityspin);
        citylist = new ArrayList<>();
        new cityAsynTask().execute("Jason data url");//put your url over here
    }
    public class cityAsynTask extends AsyncTask<String,Void,Boolean>
    {

        @Override
        protected Boolean doInBackground(String... params) {

            cityandarealist = new ArrayList<city>();

            try {
                HttpClient client = new DefaultHttpClient();
                HttpPost post = new HttpPost(params[0]);
                HttpResponse response = client.execute(post);
                int status = response.getStatusLine().getStatusCode();
                if (status == 200) {
                    HttpEntity entity = response.getEntity();
                    String data = EntityUtils.toString(entity);
                    JSONObject jobjcity = new JSONObject(data);
                    JSONArray jarray = jobjcity.getJSONArray("City");
                    for (int i = 0;i < jarray.length();i++){
                        city city = new city();
                        JSONObject jrealobject = jarray.getJSONObject(i);
                        city.setCity(jrealobject.getString("name"));
                        city.setArea1(jrealobject.getString("City_area1"));
                        city.setArea2(jrealobject.getString("City_area2"));
                        city.setArea3(jrealobject.getString("City_area3"));
                        cityandarealist.add(city);
                        citylist.add(jrealobject.getString("name"));

                    }
                    return true;
                }

            } catch (IOException e) {
                e.printStackTrace();
            } catch (JSONException e) {
                e.printStackTrace();
            }


            return false;
        }

        @Override
        protected void onPostExecute(Boolean aBoolean) {
            super.onPostExecute(aBoolean);
            if(aBoolean == false){
                Toast.makeText(MainActivity.this,"data isnot recieved",Toast.LENGTH_SHORT).show();

            } else  {
                ArrayAdapter<String> adapter = new ArrayAdapter<String> (MainActivity.this,android.R.layout.simple_spinner_item,citylist);
                adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
                selectcityspinner.setAdapter(adapter);
                selectcityspinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
                    @Override
                    public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
                        Toast.makeText(getBaseContext(), parent.getItemAtPosition(position) + " selected", Toast.LENGTH_LONG).show();

                        String Country = String.valueOf(parent.getItemAtPosition(position));
                        Spinner selectareaspinner = (Spinner) findViewById(R.id.selectareaspin);
                        List<String> AreaList = new ArrayList<String>();
                        AreaList.add(cityandarealist.get(position).getArea1());
                        AreaList.add(cityandarealist.get(position).getArea2());
                        AreaList.add(cityandarealist.get(position).getArea3());
                        ArrayAdapter<String> adapter1 = new ArrayAdapter<String>(MainActivity.this, android.R.layout.simple_spinner_item, AreaList);
                        adapter1.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
                        adapter1.notifyDataSetChanged();
                        selectareaspinner.setAdapter(adapter1);
                    }

                    @Override
                    public void onNothingSelected(AdapterView<?> parent) {

                    }
                });
            }

        }
    }

}

Main_axtivity.xml

<RelativeLayout 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:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
>


<TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="@string/Select_City"
    android:layout_alignParentLeft="true"
    android:id="@+id/Country"/>
<Spinner
    android:id="@+id/selectcityspin"
    android:layout_width="0dp"
    android:layout_height="wrap_content"
    android:layout_alignParentRight="true"
    android:layout_toRightOf="@+id/Country"
    ></Spinner>

<Spinner
    android:id="@+id/selectareaspin"
    android:layout_width="150dp"
    android:layout_height="wrap_content"
    android:layout_alignParentRight="true"
    android:layout_below="@+id/selectcityspin"
    ></Spinner>

如果您满意而不是赞成，否则请评论您的 json 数据格式/

Answer 4

你可以实现Spinner.OnItemSelectedListener

并使用下面的代码将侦听器设置为微调器

 spinner1.setOnItemSelectedListener(this);

 spinner2.setOnItemSelectedListener(this);

在onItemSelected 中，您可以使用在第一个微调器上选择的值将数据填充到第二个微调器中

 @Override
    public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {

        Spinner spinner = (Spinner) parent;
        if (spinner.getId() == R.id.spinner1) {

 // here you can populate  data in to second spinner
}
}

希望对你有帮助

Answer 5

这就是答案。在此示例中，取决于第一个微调器，第二个微调器值会发生变化。它还会更改活动中的文本，即您在第二个微调器中选择的值。如果这对您有帮助，请投票。

import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.text.Html;
import android.view.Menu;
 import android.view.View.OnClickListener;
 import java.util.ArrayList;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemSelectedListener;
import android.widget.ArrayAdapter;
 import android.widget.Button;
 import android.widget.ImageView;
 import android.widget.Spinner;
 import android.widget.TextView;

 public class Courses extends Activity {




Spinner s1,s2;
TextView seats_t,t2,hod_det;
ImageView im1;
String s;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.courses);



    s1 = (Spinner) findViewById(R.id.grad);
    s2 = (Spinner) findViewById(R.id.streams);
    seats_t=(TextView)findViewById(R.id.about1);
    t2=(TextView)findViewById(R.id.hodname1);
    hod_det=(TextView)findViewById(R.id.hoddetails);
    im1=(ImageView)findViewById(R.id.hodimage);
    t2.setText(Html.fromHtml("<b>H.O.D</b>"));

    final ArrayList<String> s1_options = new ArrayList<String>();
    final ArrayList<String> s2_options = new ArrayList<String>();

    s1_options.add("Under Graduate");
    s1_options.add("Post Graduate");


    ArrayAdapter<String> friendAdapter = new ArrayAdapter<String>(
            getApplicationContext(), android.R.layout.simple_spinner_item,
            s1_options);
    s1.setAdapter(friendAdapter);

    ArrayAdapter<String> subFriendAdapter = new ArrayAdapter<String>(
            getApplicationContext(), android.R.layout.simple_spinner_item,
            s2_options);
    s2.setAdapter(subFriendAdapter);

    s1.setOnItemSelectedListener(new OnItemSelectedListener() {

        @Override
        public void onItemSelected(AdapterView<?> arg0, View view,
                int position, long id) {

            String friendName = s1_options.get(position).toString();
            resetFriend(friendName);
      //                subFriend.setAdapter(null);

        }

        private void resetFriend(String friendName) {
            s2_options.removeAll(s2_options);
            if (friendName.equals("Under Graduate")) {
                s2_options.add("B.Tech(C.S.E)");
                s2_options.add("B.Tech(E.C.E)");
                s2_options.add("B.Tech(E.E.E)");
                s2_options.add("B.Tech(I.T)");

            } else if (friendName.equals("Post Graduate")) {
                s2_options.add("M.B.A");
                s2_options.add("M.C.A");
                s2_options.add("M.Tech(C.N)");
                s2_options.add("M.Tech(C.S)");
                s2_options.add("M.Tech(C.S.E)");
                s2_options.add("M.Tech(V.L.S.I)");
                s2_options.add("M.Tech(D.S.C.E)");
            } 
            ArrayAdapter<String> subFriendAdapter = new ArrayAdapter<String>(
                    getApplicationContext(),
                    android.R.layout.simple_spinner_item, s2_options);
            s2.setAdapter(subFriendAdapter);

        }

        @Override
        public void onNothingSelected(AdapterView<?> arg0) {

        }

    });

    s2.setOnItemSelectedListener(new OnItemSelectedListener() {

        @Override
        public void onItemSelected(AdapterView<?> arg0, View arg1,
                int arg2, long arg3) {


             s=((TextView)arg1).getText().toString();

            if(s.equals("B.Tech(C.S.E)"))
            {

                seats_t.setText(Html.fromHtml("<b>Computer Science Engineering:</b> - 180 seats"));



            }

            if(s.equals("B.Tech(E.C.E)"))
            {

                seats_t.setText(Html.fromHtml("<b>Electronics and Communication Engineering:</b> - 180 seats"));



            }
            if(s.equals("B.Tech(E.E.E)"))
            {   

                seats_t.setText(Html.fromHtml("<b>Electrical and Electronics Engineering:</b> - 60 seats"));



            }

            if(s.equals("M.Tech(D.S.C.E)"))
            {   
                seats_t.setText(Html.fromHtml("<b>M.Tech. ( D.S.C.E.):</b> - 24(2nd shift seats"));

            }


        }
        @Override
        public void onNothingSelected(AdapterView<?> arg0) {
            // TODO Auto-generated method stub

        }
    });

}


  }