Android Spinner 组件的应用实例

Android Spinner 组件

Spinner: 下拉组件

使用事项：布局在XML 中实现，具体的数据在JAVA 代码中实现；

所用知识点：

数组适配器：ArrayAdapter  用于关系M 层和 C 层；

事件：OnItemSelectedListener;

案列：查看十二星座效果图：

xml:代码如下：

java代码如下：

  package com.example.spinnertest; 
 
import java.util.ArrayList; 
 
import android.app.Activity; 
import android.content.res.Resources; 
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; 
import android.widget.TextView; 
 
public class MainActivity extends Activity { 
 
  private Spinner spinner; 
  private TextView tx; 
  private ArrayList list = null; 
  protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.main); 
 
     
    tx = (TextView) findViewById(R.id.showInfo); 
 
     
    spinner = (Spinner) findViewById(R.id.spinner); 
 
     
    list = new ArrayList();  
    list.add("Aries"); 
    list.add("Taurus"); 
    list.add("Gemini"); 
    list.add("Cancer"); 
    list.add("Leo"); 
    list.add("Virgo"); 
    list.add("Libra"); 
    list.add("Scorpio"); 
    list.add("Sagittarius"); 
    list.add("Capricorn"); 
    list.add("Aquarius"); 
    list.add("Pisces"); 
 
 
      
    ArrayAdapter adapter = new ArrayAdapter(this, android.R.layout.simple_spinner_dropdown_item, list); 
 
     
    spinner.setAdapter(adapter); 
 
    spinner.setonItemSelectedListener(new onItemSelectedListener() { 
 
       
      public void onItemSelected(AdapterView arg0, View arg1, 
   int id, long position) { 
 // Toast.makeText(MainActivity.this, "你选择的是第:"+id+"值为："+list.get(id), 1000).show(); 
  
  
 String temp = getConstellation(id); 
 tx.setText("t"+temp); 
 
      } 
 
      @Override 
      public void onNothingSelected(AdapterView arg0) { 
 // TODO Auto-generated method stub 
 
      } 
    }); 
 
 
  } 
 
   
  protected String getConstellation(int id){ 
    Resources rs = getResources(); 
    String temp = ""; 
    switch(id){ 
    case 0: 
      temp = rs.getString(R.string.Aries); 
      break; 
    case 1: 
      temp = rs.getString(R.string.Taurus); 
      break; 
    case 2: 
      temp = rs.getString(R.string.Gemini); 
      break; 
    case 3: 
      temp = rs.getString(R.string.Cancer); 
      break; 
    case 4: 
      temp = rs.getString(R.string.Leo); 
      break; 
    case 5: 
      temp = rs.getString(R.string.Virgo); 
      break; 
    case 6: 
      temp = rs.getString(R.string.Libra); 
      break; 
    case 7: 
      temp = rs.getString(R.string.Scorpio); 
      break; 
    case 8: 
      temp = rs.getString(R.string.Sagittarius); 
      break; 
    case 9: 
      temp = rs.getString(R.string.Capricorn); 
      break; 
    case 10: 
      temp = rs.getString(R.string.Aquarius); 
      break; 
    case 11: 
      temp = rs.getString(R.string.Pisces); 
      break; 
    case 12: 
      temp = rs.getString(R.string.Aries); 
      break; 
    } 
    return temp; 
  } 
 
 
} 

以上就是Android Spinner 组件的实例详解，如有疑问请留言或者到本站社区交流讨论，感谢阅读，希望能帮助到大家，谢谢大家对本站的支持！