Android使用Spinner实现城市级联下拉框

<LinearLayout 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:background="@color/white"   android:orientation="horizontal"   tools:context=".MainActivity">    <Spinner     android:id="@+id/spinner1"     android:layout_width="match_parent"     android:layout_height="wrap_content"     android:layout_weight="1" />    <Spinner     android:id="@+id/spinner2"     android:layout_width="match_parent"     android:layout_height="wrap_content"     android:layout_weight="1"     android:visibility="invisible" />    <Spinner     android:id="@+id/spinner3"     android:layout_width="match_parent"     android:layout_height="wrap_content"     android:layout_weight="1"     android:visibility="invisible" />  </LinearLayout> 

<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"   android:layout_width="match_parent"   android:layout_height="wrap_content"   android:background="@color/white"   android:gravity="center"   android:orientation="horizontal"   android:padding="5dp">    <TextView     android:id="@+id/txt_name"     android:layout_width="match_parent"     android:layout_height="wrap_content"     android:text="名称"     android:textSize="16dp" /> </LinearLayout> 

/**  * @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 ? 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<?> 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<?> adapterView) {      }   }    /**    * Spinner2点击事件    */   public class Spinner2ClickListener implements AdapterView.OnItemSelectedListener {      @Override     public void onItemSelected(AdapterView<?> 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<?> adapterView) {      }   }    /**    * Spinner3点击事件    */   public class Spinner3ClickListener implements AdapterView.OnItemSelectedListener {      @Override     public void onItemSelected(AdapterView<?> 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<?> adapterView) {      }   } }