根据另一个 Spinner 选择更改 Spinner

Question

我有一个包含所有国家名称的字符串数组和另一个带有各自国家代码的字符串数组。 我将国家名称字符串设置为微调器。 当我从微调器中选择项目时，其各自的国家代码应设置为微调器。并且该项目也应该更改为代码。 同样，如果我选择另一个项目，它的代码也应该设置为 spinner 和 item。但是我选择的第一个应该更改为原来的国家名称。 我该怎么做？

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"
tools:context="com.example.temp.MainActivity" >

<Spinner
    android:id="@+id/spinnerCountry"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignParentTop="true"
    android:layout_centerHorizontal="true"
    android:layout_marginTop="124dp" />

  </RelativeLayout>

Java 代码

package com.example.temp;

import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.ArrayAdapter;
import android.widget.Spinner;

public class MainActivity extends Activity {

     final String[] countries = new String[] {"Afghanistan(AF)", "Albania(AX)",
                                              "Algeria(AL)", "American    Samoa(DZ)",
                                              "Andorra(AS)"};

    final String[] countrycodes = new String[]{"AF","AX","AL","DZ","AS"};

    Spinner spinnerCountry;

    ArrayAdapter<String> arrayAdapter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        spinnerCountry=(Spinner)findViewById(R.id.spinnerCountry);

        arrayAdapter =  new ArrayAdapter<String>(getApplicationContext(), 
                                         android.R.layout.simple_list_item_1,countries);
        spinnerCountry.setAdapter(arrayAdapter);
    }
}

我无法分享我的原件，因为我在我的应用程序中使用它。 但是，我共享与原始代码相同的代码。 当我从微调器中选择国家时，我想设置相应的代码。

Answer 1

String[] countries = {"INDIA","DUBAI","KSA"};
        String[] country_code = {"91","971","966"};

        final Spinner spinnerCountry = (Spinner)findViewById (R.id.spinnerCountry);
        final Spinner spinnerCountryCode = (Spinner) findViewById (R.id.spinnerCountryCode);

        ArrayAdapter<String> countryAdapter =  new ArrayAdapter<String>(getApplicationContext(), android.R.layout.simple_list_item_1,countries);

        ArrayAdapter<String> countryCodeAdapter =  new ArrayAdapter<String>(getApplicationContext(), android.R.layout.simple_list_item_1,country_code);

        spinnerCountry.setAdapter(countryAdapter);
        spinnerCountryCode.setAdapter(countryCodeAdapter);
        
        spinnerCountry.setOnItemSelectedListener(new OnItemSelectedListener() {

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

            @Override
            public void onNothingSelected(AdapterView<?> arg0) {
                
            }
            
        });
        
        spinnerCountryCode.setOnItemSelectedListener(new OnItemSelectedListener() {

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

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

这里有一些代码可以解决你的问题。

解释：

假设您有两个微调器 R.id.spinnerCountry 和 R.id.spinnerCountryCode。

如您所见，我创建了两个数组，分别包含 countryName 和 countryCode。

工作流程：-

当我在 Spinner 中选择一个项目时，另一个 Spinner 会加载与该位置对应的另一个项目。

代码不言自明！

Answer 2

String businesstype_array[] = {"Retail", "Vendor","Agriculture" };

public static final String JSON_STRING = "{\"Retail\":[\"General Stores\",\"Clothing\",\"Electronics\",\"Mobile Phones\"],\"Vendor\":[\"Gas agency\",\"newspaper\",\"vendor\",\"milk vendor\",\"laundry\"],\"Agriculture\":[\"lGas agency\",\"lnewspaper\",\"lvendor\",\"lmilk vendor\",\"llaundry\"]}";

ArrayAdapter adapter_business = new ArrayAdapter(getActivity(), R.layout.singlerow_businesstype_spinner, businesstype_array); businesstype.setAdapter(adapter_business);

    businesstype.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
        @Override
        public void onItemSelected(AdapterView<?> adapterView, View view, int i, long l) {

            Log.d("jsonntring", "out tryy");
            try {
                Log.d("jsonntring", "in tryy");


                jsonObject = new JSONObject(JSON_STRING);
                Log.d("jsonntring", jsonObject.toString() + "length==" + jsonObject.length());


                JSONArray jsonarray = jsonObject.getJSONArray(businesstype.getSelectedItem().toString());

                Log.d("jsonarray&", jsonarray.toString());

                businesstype__subtype.clear();
                for (int j = 0; j < jsonarray.length(); j++) {
                    String s = jsonarray.getString(j);

                    businesstype__subtype.add(s);

                    Log.d("jsonarray&", jsonarray.toString());

                }

                ArrayAdapter adapter_sub_business = new ArrayAdapter(getActivity(), R.layout.singlerow_businesstype_spinner, businesstype__subtype);
                business_subtype.setAdapter(adapter_sub_business);

            } catch (JSONException e)
            {
                Log.d("jsonntring_exce", e.toString());

            }


        }

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

        }
    });