Spinner实现三级联动

来源：互联网发布：mac最好用的输入法编辑：程序博客网时间：2024/06/10 16:22

    实现三个下拉按钮,要求选择第一个省份时,第二个城市,第三个景点同步跟踪相对应的省份      在资源文件夹的布局文件中XML代码:      <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:orientation="vertical"          tools:context="com.phone.day04_home02.MainActivity" >          <Spinner               android:id="@+id/s1_sp"              android:layout_width="match_parent"              android:layout_height="wrap_content"              />           <Spinner               android:id="@+id/s2_sp"              android:layout_width="match_parent"              android:layout_height="wrap_content"              />            <Spinner               android:id="@+id/s3_sp"              android:layout_width="match_parent"              android:layout_height="wrap_content"              />      </LinearLayout>      在MainActivity中的代码,利用适配器完成实现

public class MainActivity extends Activity {      //创建适配器三个      private ArrayAdapter<String> p_adapter,c_adapter,j_adapter;      //创建对应的资源数组,城市和景点采用二维数组      private String[] province={"北京","上海","山东","江苏"};      private String[][] city={{"海淀区","昌平区","朝阳区"},{"黄浦区","浦东新区"},{"济南","青岛","聊城"},{"苏州","南京","常州"}};      private String[][] jingdian={{"故宫","颐和园","圆明园"},{"外滩","豫园","陆家嘴","南京步行街"},{"栈桥","大明湖","趵突泉"},{"苏州园林","南京长江大桥","江南小镇"}};      //声明Spinner的引用      private Spinner s1_sp;      private Spinner s2_sp;      private Spinner s3_sp;      @Override      protected void onCreate(Bundle savedInstanceState) {          super.onCreate(savedInstanceState);          setContentView(R.layout.activity_main);          s1_sp=(Spinner) findViewById(R.id.s1_sp);          s2_sp=(Spinner) findViewById(R.id.s2_sp);          s3_sp=(Spinner) findViewById(R.id.s3_sp);          //构建适配器          p_adapter=new ArrayAdapter<String> (this,android.R.layout.simple_spinner_item,province);          c_adapter=new ArrayAdapter<String> (this,android.R.layout.simple_spinner_item);          c_adapter.addAll(city[0]);          p_adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);        c_adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);        j_adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);        j_adapter=new ArrayAdapter<String> (this,android.R.layout.simple_spinner_item);          j_adapter.addAll(jingdian[0]);          //将适配器和Spinner链接          s1_sp.setAdapter(p_adapter);          s2_sp.setAdapter(c_adapter);          s3_sp.setAdapter(j_adapter);          //设置省份Spinner的监听器          s1_sp.setOnItemSelectedListener(new OnItemSelectedListener() {              @Override              public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {                  // TODO Auto-generated method stub                  //清空适配器                  c_adapter.clear();                  j_adapter.clear();                  //添加数组资源,跟组对应的位置                  c_adapter.addAll(city[position]);                  j_adapter.addAll(jingdian[position]);                  //Spinner默认选择重置为第一个                  s2_sp.setSelection(0);                  s3_sp.setSelection(0);              }              @Override              public void onNothingSelected(AdapterView<?> parent) {                  // TODO Auto-generated method stub              }          });      }      @Override      public boolean onCreateOptionsMenu(Menu menu) {          // Inflate the menu; this adds items to the action bar if it is present.          getMenuInflater().inflate(R.menu.main, menu);          return true;      }      @Override      public boolean onOptionsItemSelected(MenuItem item) {          // Handle action bar item clicks here. The action bar will          // automatically handle clicks on the Home/Up button, so long          // as you specify a parent activity in AndroidManifest.xml.          int id = item.getItemId();          if (id == R.id.action_settings) {              return true;          }          return super.onOptionsItemSelected(item);      }  }

注:原来在iteye写的一篇文章,现在要做个二级联动,就搬到CSDN了

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