我想根據之前的spiiner的選定項目在spiiner中添加項目？我怎麼能？

Question

我在我的application.one（微調1）選擇資格和另一個（微調2）我有2個微調是根據選定的資格在微調1顯示課程。 如何添加項目的基礎上選擇的項目1.微調

Answer 1

試試這個代碼：

的Java類

package com.example.spinnerexam; 
    import java.util.ArrayList; 
    import java.util.List; 

    import android.annotation.TargetApi; 
    import android.app.Activity; 
    import android.os.Build; 
    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; 

    @TargetApi(Build.VERSION_CODES.HONEYCOMB) 
    public class SpinnerExample extends Activity implements OnItemSelectedListener{ 

     private Spinner qualificationSpinner, coursesSpinner; 
     ArrayAdapter<String> courseAdapter; 

     List<ArrayList<String>> allCoursesList; 
     CustomOnItemSelectedListener pCustomOnItemSelectedListener; 
     @Override 
     public void onCreate(Bundle savedInstanceState) { 
      super.onCreate(savedInstanceState); 
      setContentView(R.layout.activity_main); 

      qualificationSpinner = (Spinner) findViewById(R.id.spinner1); 
      coursesSpinner = (Spinner) findViewById(R.id.spinner2); 

      List<String> qualificationList = new ArrayList<String>(); 
      qualificationList.add("B.tech"); 
      qualificationList.add("M.tech"); 
      qualificationList.add("MCA"); 

      ArrayList<String> cources_Btech = new ArrayList<String>(); 
      cources_Btech.add("Btechcourse1"); 
      cources_Btech.add("Btechcourse2"); 
      cources_Btech.add("Btechcourse3"); 

      ArrayList<String> cources_Mtech = new ArrayList<String>(); 
      cources_Mtech.add("Mtechcourse1"); 
      cources_Mtech.add("Mtechcourse2"); 
      cources_Mtech.add("Mtechcourse3"); 

      ArrayList<String> cources_MCA = new ArrayList<String>(); 
      cources_MCA.add("MCAcourse1"); 
      cources_MCA.add("MCAcourse2"); 
      cources_MCA.add("MCAcourse3"); 

      allCoursesList = new ArrayList<ArrayList<String>>(); 
      allCoursesList.add(cources_Btech); 
      allCoursesList.add(cources_Mtech); 
      allCoursesList.add(cources_MCA); 




      ArrayAdapter<String> qualificationAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item, qualificationList); 

      qualificationAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item); 

      qualificationSpinner.setAdapter(qualificationAdapter); 


      courseAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item); 
      courseAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item); 
      coursesSpinner.setAdapter(courseAdapter); 

      addListenerOnSpinnerItemSelection(); 


     } 

     // Add spinner data 

     public void addListenerOnSpinnerItemSelection(){ 

      qualificationSpinner.setOnItemSelectedListener(this); 
      coursesSpinner.setOnItemSelectedListener(this); 
     } 


     @Override 
     public void onItemSelected(AdapterView<?> parent, View view, int pos, long id) { 
      courseAdapter.clear(); 
      courseAdapter.addAll(allCoursesList.get(pos)); 
      courseAdapter.notifyDataSetChanged(); 
     } 

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

     } 

    } 

XML佈局

<?xml version="1.0" encoding="utf-8"?> 
     <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
      android:layout_width="fill_parent" 
      android:layout_height="fill_parent" 
      android:orientation="vertical" > 

      <Spinner 
       android:id="@+id/spinner1" 
       android:layout_width="match_parent" 
       android:layout_height="wrap_content" 
       android:prompt="@string/spinner_prompt" /> 

      <Spinner 
       android:id="@+id/spinner2" 
       android:layout_width="match_parent" 
       android:layout_height="wrap_content" 
       android:prompt="@string/spinner_prompt" /> 

     </LinearLayout>