Question

我想根据在第一个微调器中选择的值从第二个微调器中选择值。例如，我的第一个微调器显示国家名称，第二个微调器显示相应国家的城市名称。问题是第二个微调器始终是第一个选择的值。示例 - 第一个微调器是国家名称 - 印度，巴基斯坦，中国，第二个微调器是城市名称，所以如果我选择印度和我的微调器是-dhhi，up，旁遮普，那么它总是得到选择值作为德里总是。当我改变了所选的值，即使onItemSelected函数没有再次调用。相同的代码是 -

public class LaunchCampaign1 extends Activity implements OnItemSelectedListener,OnClickListener
{
    String[] countryStr = {"Select", "India", "Pakistan", "China"};
    String[] states_india = {"Select", "Delhi", "UP", "Bihar"};
    String[] states_china = { "Select","Shanghai", "Beijing", "Nanjing"};
    String[] states_pak = { "Select","Lahor", "Islamabaad", "Punjab"};
 @Override
    protected void onCreate(Bundle savedInstanceState) 
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_launch_campaign);
country=(Spinner)findViewById(R.id.spinnerCountry);

        country.setOnItemSelectedListener((OnItemSelectedListener) this);
        ArrayAdapter <String> c = new ArrayAdapter <String> (this,android.R.layout.simple_spinner_item,countryStr);
        c.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
        country.setAdapter(c);

        city=(Spinner)findViewById(R.id.spinnerCity);
        city.setOnItemSelectedListener((OnItemSelectedListener) this);
        city.setEnabled(false);
 public void onItemSelected(AdapterView<?> arg0, View view, int position,long id) 
    {
        if(arg0.equals(country))
        {
            city.setEnabled(true);
            if(country.getSelectedItem().equals("India"))
            {
                ArrayAdapter <String> s1 = new ArrayAdapter <String> (this,android.R.layout.simple_spinner_item,states_india);
                s1.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
                city.setAdapter(s1);
                /*city.setSelection(position);
                Log.e("pos",""+position);
                String cityStr = (String) city.getSelectedItem();*/
                String cityStr=(String) city.getSelectedItem();
                Log.e("city",cityStr);
             }
             else  if(country.getSelectedItem().equals("Pakistan"))
             {
                 ArrayAdapter <String> s2 = new ArrayAdapter <String> (this,android.R.layout.simple_spinner_item,states_pak);
                 s2.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
                 city.setAdapter(s2);
             }
             else  if(country.getSelectedItem().equals("China"))
             {
                 ArrayAdapter <String> s3 = new ArrayAdapter <String> (this,android.R.layout.simple_spinner_item,states_china);
                 s3.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
                 city.setAdapter(s3);
             }
        }
   } 
    }

Answer 1

解决了我的问题。我只需要为第二个微调器实现onItemSelectListener。现在更新的代码是 -

public class LaunchCampaign1 extends Activity implements OnClickListener,OnItemSelectedListener
{
String[] countryStr = {"Select", "India", "Pakistan", "China"};
    String[] states_india = {"Select", "Delhi", "UP", "Bihar"};
    String[] states_china = { "Select","Shanghai", "Beijing", "Nanjing"};
    String[] states_pak = { "Select","Lahor", "Islamabaad", "Punjab"};
 @Override
    protected void onCreate(Bundle savedInstanceState) 
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_launch_campaign);
country=(Spinner)findViewById(R.id.spinnerCountry);

        country.setOnItemSelectedListener((OnItemSelectedListener) this);
        ArrayAdapter <String> c = new ArrayAdapter <String> (this,android.R.layout.simple_spinner_item,countryStr);
        c.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
        country.setAdapter(c);

        city=(Spinner)findViewById(R.id.spinnerCity);
        city.setOnItemSelectedListener((OnItemSelectedListener) this);
        city.setEnabled(false);
public void onItemSelected(AdapterView<?> parent, View view, int position,long id) 
    {
        switch(parent.getId())
        {
            case R.id.spinnerCountry: 
                city.setEnabled(true);
                if(country.getSelectedItem().equals("India"))
                {
                    ArrayAdapter <String> s1 = new ArrayAdapter <String> (this,android.R.layout.simple_spinner_item,states_india);
                    s1.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
                    city.setAdapter(s1);
                }
                else  if(country.getSelectedItem().equals("Pakistan"))
                {
                    ArrayAdapter <String> s2 = new ArrayAdapter <String> (this,android.R.layout.simple_spinner_item,states_pak);
                    s2.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
                    city.setAdapter(s2);
                }
                else  if(country.getSelectedItem().equals("China"))
                {
                    ArrayAdapter <String> s3 = new ArrayAdapter <String> (this,android.R.layout.simple_spinner_item,states_china);
                    s3.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
                    city.setAdapter(s3);
                }
            break;

            case R.id.spinnerCity:
                String cityStr1=city.getSelectedItem().toString();
                Log.e("city1",cityStr1);
        }
    }
@Override
    public void onNothingSelected(AdapterView<?> parent) {
        // TODO Auto-generated method stub

    }
}

Answer 2

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemSelectedListener;
import android.widget.ArrayAdapter;
import android.widget.Spinner;

public class Data1Activity extends Activity {
String[] countryStr = { "India",  "China","Pakistan"};
String[] states_india = { "Delhi", "UP", "Bihar"};
String[] states_china = { "Shanghai", "Beijing", "Nanjing"};
String[] states_pak = { "Lahor", "Islamabaad", "Punjab"};
Spinner country,city;
ArrayAdapter<String> adaptercountry;
ArrayAdapter<String> adaptercity;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main1);

    country= (Spinner) findViewById(R.id.spinner1);
    city = (Spinner) findViewById(R.id.spinner2);
    adaptercountry = new ArrayAdapter<String>(getApplicationContext(), android.R.layout.simple_list_item_1,countryStr);
    country.setAdapter(adaptercountry);

    country.setOnItemSelectedListener(new OnItemSelectedListener() {

        @Override
        public void onItemSelected(AdapterView<?> parent, View view,
                int position, long id) {
            if(position==0)
            {
                adaptercity = new ArrayAdapter<String>(getApplicationContext(), android.R.layout.simple_list_item_1,states_india);
            }
            else
                if(position==1)
                {
                    adaptercity = new ArrayAdapter<String>(getApplicationContext(), android.R.layout.simple_list_item_1,states_china);
                }
                else
                    if(position==2)
                    {
                        adaptercity = new ArrayAdapter<String>(getApplicationContext(), android.R.layout.simple_list_item_1,states_pak);
                    }

            city.setAdapter(adaptercity);

        }

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

        }
    });

  }

}

根据第一个微调器的选定值从第二个微调器获取选定值

2 个答案: