Android编程实现多列显示的下拉列表框Spinner功能示例

本文实例讲述了android编程实现多列显示的下拉列表框spinner功能。分享给大家供大家参考，具体如下：

先上张效果图：

严格来说，这并不是一个下拉列表，只不过实现的效果很像是下拉列表

实现原理：

该下拉列表其实是一个alertdialog.builder，给它设置了一个以linearlayout布局的view。该view内使用了一个gridview组件，

代码：

package yyy.testandroid9;
private intent intent;
private int index = 0;
private sharedpreferences preferences;
private file file;
private spinner spinner;
private gridview gridview;
private linearlayout layout;
private builder builder;
private alertdialog dialog;
private myadapter adapter;
/** called when the activity is first created. */
@override
public void oncreate(bundle savedinstancestate) {
    super.oncreate(savedinstancestate);
    setcontentview(r.layout.main);
    layoutinflater inflater = layoutinflater.from(this);
    layout = (linearlayout) inflater.inflate(r.layout.bank_grid, null);
    gridview = (gridview) layout.findviewbyid(r.id.grid);
    adapter = new myadapter(this);
    gridview.setadapter(adapter);
    button1 = (button) findviewbyid(r.id.button1);
    button2 = (button) findviewbyid(r.id.button2);
    textview = (textview) findviewbyid(r.id.textview);
    builder = new builder(testandroid9activity.this);
    builder.setview(layout);
    button1.setonclicklistener(new onclicklistener() {
      public void onclick(view arg0) {
        // todo auto-generated method stub
         if(dialog == null){
           dialog = builder.show();
         }
         dialog.show();
      }
    });
    gridview.setonitemclicklistener(new onitemclicklistener() {
      public void onitemclick(adapterview<?> arg0, view arg1, int position,
          long arg3) {
        // todo auto-generated method stub
        button1.settext(getresources().getstringarray(r.array.city)[position]);
        dialog.dismiss();
        adapter.map.put(index, false);
        adapter.map.put(position, true);
        index = position;
        adapter.notifydatasetchanged();
      }
    });
}
private class myadapter extends baseadapter{
    private context context;
    private string[] citys;
    private layoutinflater inflater;
    public hashmap<integer, boolean> map;
    public myadapter(context context) {
      super();
      this.context = context;
      citys = context.getresources().getstringarray(r.array.city);
      inflater = layoutinflater.from(context);
      map = new hashmap<integer, boolean>();
      for(int i=0;i<citys.length;i++){
        map.put(i, false);
      }
    }
    public int getcount() {
      // todo auto-generated method stub
      return citys.length;
    }
    public object getitem(int position) {
      // todo auto-generated method stub
      return null;
    }
    public long getitemid(int position) {
      // todo auto-generated method stub
      return position;
    }
    public view getview(int position, view view, viewgroup parent) {
      // todo auto-generated method stub
      if(view == null){
        view = inflater.inflate(r.layout.bank_item, null);
      }
      textview textview = (textview) view.findviewbyid(r.id.list_text);
      radiobutton radiobutton = (radiobutton) view.findviewbyid(r.id.radiobutton);
      radiobutton.setchecked(map.get(position));
      textview.settext(citys[position]);
      return view;
    }
}

bank_grid.xml

<?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"
  android:padding="20dp"
  android:background="#ffffff"
  android:id="@+id/grid_layout">
  <gridview
    android:id="@+id/grid"
      android:layout_width="fill_parent"
      android:layout_height="fill_parent"
      android:verticalspacing="20px"
      android:horizontalspacing="10px"
      android:numcolumns="4"
      android:scrollbars="vertical"
      android:layout_margin="10dp"/>
</linearlayout>

bank_item.xml

<?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:background="#ffffff"
   >
   <radiobutton
    android:id="@+id/radiobutton"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginright="15dp"
    android:focusable="false"
    android:clickable="false"
    android:focusableintouchmode="false"
    />
  <textview
    android:id="@+id/list_text"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:textcolor="#000000"
    android:layout_gravity="center_vertical"/>
</linearlayout>

更多关于android相关内容感兴趣的读者可查看本站专题：《android视图view技巧总结》、《android布局layout技巧总结》、《android开发入门与进阶教程》、《android调试技巧与常见问题解决方法汇总》、《android基本组件用法总结》及《android控件用法总结》

希望本文所述对大家android程序设计有所帮助。