Android使用Spinner实现城市级联下拉框

<&＃63;xml version="1.0" encoding="utf-8"&＃63;> 
 
 
   
 

/** 
 * @author: xiaolijuan 
 * @description: Spinner适配器 
 * @projectName: SpinnerProject 
 * @date: 2015-10-18 
 * @time: 00:19 
 */ 
public class SpinnerAdapter extends BaseAdapter { 
  private Context context; 
  private String[] array; 
  private int layoutId; 
 
  /** 
   * 构造方法 
   * @param context 上下文对象 
   * @param array 数组 
   * @param layoutId 布局Id 
   */ 
  public SpinnerAdapter(Context context, String[] array, int layoutId) { 
    this.cOntext= context; 
    this.array = array; 
    this.layoutId = layoutId; 
  } 
 
  /** 
   * 获取Item总数 
   * @return 
   */ 
  @Override 
  public int getCount() { 
    return array.length; 
  } 
 
  /** 
   * 获取一个Item对象 
   * @param position 
   * @return 
   */ 
  @Override 
  public Object getItem(int position) { 
    return array[position]; 
  } 
 
  /** 
   * 获取指定item的ID 
   * @param position 
   * @return 
   */ 
  @Override 
  public long getItemId(int position) { 
    return position; 
  } 
 
  /** 
   * 绘制的内容均在此实现 
   * @param position position就是位置从0开始 
   * @param convertView convertView是Spinner中每一项要显示的view 
   * @param parent parent就是父窗体了，也就是Spinner 
   * @return 
   */ 
  @Override 
  public View getView(int position, View convertView, ViewGroup parent) { 
    View item = convertView != null &＃63; convertView : View.inflate(context, layoutId, null); 
    TextView txt_name = (TextView) item.findViewById(R.id.txt_name); 
    txt_name.setText(array[position]); 
    return item; 
  } 
} 

/** 
 * 使用Spinner实现城市级联下拉框 
 * Spinner最简单使用方式步骤如下： 
 * 第一步：在布局文件中添加Spinner控件。 
 * 第二步：在Acitvity中通过id找到它。 
 * 第三步：给Spinner绑定一个适配器。 
 * 第四步：绑定监听器就可以用了。 
 */ 
public class MainActivity extends Activity { 
  private Spinner spinner1, spinner2, spinner3; 
 
  @Override 
  protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main); 
 
    spinner1 = (Spinner) findViewById(R.id.spinner1); 
    spinner2 = (Spinner) findViewById(R.id.spinner2); 
    spinner3 = (Spinner) findViewById(R.id.spinner3); 
 
    //加载省份列表 
    loadProvince(); 
    //设置spinner1的监听事件 
    spinner1.setOnItemSelectedListener(new Spinner1ClickListener()); 
    //加载城市列表 
    loadCity(); 
    //设置spinner2的监听事件 
    spinner2.setOnItemSelectedListener(new Spinner2ClickListener()); 
    //加载区域列表 
    loadGZArea(); 
    //设置spinner3的监听事件 
    spinner3.setOnItemSelectedListener(new Spinner3ClickListener()); 
  } 
 
  /** 
   * 加载省份列表 
   */ 
  public void loadProvince() { 
    String[] array1 = new String[]{"请选择", "广东省"}; 
    SpinnerAdapter adapterOne= new SpinnerAdapter(this, array1, R.layout.activity_item); 
    spinner1.setAdapter(adapterOne); 
  } 
 
  /** 
   * 加载城市列表 
   */ 
  public void loadCity() { 
    String[] array2 = new String[]{"请选择", "广州市", "深圳市"}; 
    SpinnerAdapter modelTwo = new SpinnerAdapter(this, array2, R.layout.activity_item); 
    spinner2.setAdapter(modelTwo); 
  } 
 
  /** 
   * 加载广州区域列表 
   */ 
  public void loadGZArea() { 
    String[] array3 = new String[]{"请选择", "天河区", "越秀区", "荔湾区", "海珠区", "萝岗区", "白云区", "黄埔区", "花都区"}; 
    SpinnerAdapter modelThree = new SpinnerAdapter(this, array3, R.layout.activity_item); 
    spinner3.setAdapter(modelThree); 
  } 
 
  /** 
   * 加载深圳区域列表 
   */ 
  public void loadSZArea() { 
    String[] array3 = new String[]{"请选择", "龙岗区", "南山区", "福田区", "罗湖区", "盐田区", "宝安区"}; 
    SpinnerAdapter modelThree = new SpinnerAdapter(this, array3, R.layout.activity_item); 
    spinner3.setAdapter(modelThree); 
  } 
 
  /** 
   * Spinner1点击事件 
   */ 
  public class Spinner1ClickListener implements AdapterView.OnItemSelectedListener { 
 
    @Override 
    public void onItemSelected(AdapterView<&＃63;> adapterView, View view, int i, long l) { 
      String str = (String) adapterView.getItemAtPosition(i); 
      //判断是否选择城市，如果没有选择那么就隐藏Spinner2,Spinner3两个下拉框，否则显示Spinner2下拉框，继续隐藏Spinner3 
      if (str.equals("请选择")) { 
        spinner2.setVisibility(View.INVISIBLE); 
        spinner3.setVisibility(View.INVISIBLE); 
      } else { 
        spinner2.setVisibility(View.VISIBLE); 
 
        //将第二个下拉框的选项重新设置为选中“请选择”这个选项。 
        spinner2.setSelection(0); 
      } 
 
      Toast.makeText(getApplicationContext(), str, Toast.LENGTH_SHORT).show(); 
    } 
 
    @Override 
    public void onNothingSelected(AdapterView<&＃63;> adapterView) { 
 
    } 
  } 
 
  /** 
   * Spinner2点击事件 
   */ 
  public class Spinner2ClickListener implements AdapterView.OnItemSelectedListener { 
 
    @Override 
    public void onItemSelected(AdapterView<&＃63;> adapterView, View view, int i, long l) { 
      String str = (String) adapterView.getItemAtPosition(i); 
      if (str.equals("请选择")) { 
        spinner3.setVisibility(View.INVISIBLE); 
      } else { 
        //显示第三个Spinner3 
        spinner3.setVisibility(View.VISIBLE); 
 
        if (str.equals("深圳市")) { 
          //重新加载深圳区域列表 
          loadSZArea(); 
        } else if (str.equals("广州市")) { 
          //重新加载广州区域列表 
          loadGZArea(); 
        } 
      } 
      Toast.makeText(getApplicationContext(), str, Toast.LENGTH_SHORT).show(); 
    } 
 
    @Override 
    public void onNothingSelected(AdapterView<&＃63;> adapterView) { 
 
    } 
  } 
 
  /** 
   * Spinner3点击事件 
   */ 
  public class Spinner3ClickListener implements AdapterView.OnItemSelectedListener { 
 
    @Override 
    public void onItemSelected(AdapterView<&＃63;> adapterView, View view, int i, long l) { 
      String str = (String) adapterView.getItemAtPosition(i); 
      Toast.makeText(getApplicationContext(), str, Toast.LENGTH_SHORT).show(); 
    } 
 
    @Override 
    public void onNothingSelected(AdapterView<&＃63;> adapterView) { 
 
    } 
  } 
}