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：
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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》
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