Android中Spinner下拉列表(使用ArrayAdapter和自定义Adapter实现).
今天学习了Spinner组件,使用Spinner相当于从下拉列表中选择项目,下面演示一下Spinner的使用(分别使用ArrayAdapter和自定义Adapter实现)
(一):使用ArrayAdapter进行适配数据:
①:首先定义一个布局文件:
01 | < span style = "font-size:16px;" ><? xml version = "1.0" encoding = "utf-8" ?> |
02 | < LinearLayout xmlns:android = "http://schemas.android.com/apk/res/android" |
03 | android:layout_width = "fill_parent" |
04 | android:layout_height = "fill_parent" |
05 | android:orientation = "vertical" > |
08 | android:id = "@+id/spinner1" |
09 | android:layout_width = "match_parent" |
10 | android:layout_height = "wrap_content" |
【注意:】上面的Spinner有两个属性1:prompt是初始的时候,Spinner显示的数据,是一个引用类型2:entries是直接在xml布局文件中绑定数据源(可以不设置,即可以在Activity中动态绑定)
②:建立数据源,使用数组,这些数据将会在Spinner下来列表中进行显示:
1 | < span style = "font-size:16px;" ><? xml version = "1.0" encoding = "utf-8" ?> |
3 | < string-array name = "spinnername" > |
③:接着在Activity中加入如下的代码(使用了系统定义的下拉列表的布局文件,当然也可以自定义)
2 | mSpinner
=(Spinner)findViewById(R.id.spinner1); |
4 | String[]
mItems=getResources().getStringArray(R.array.spinnername); |
6 | ArrayAdapter<String>
_Adapter= new ArrayAdapter<String>( this ,android.R.layout.simple_spinner_item,
mItems); |
8 | mSpinner.setAdapter(_Adapter); |
以上代码初步完成,看下运行效果:
下面是关于Spinner的点击事件(效果图如上图):
01 | mSpinner.setOnItemSelectedListener( new OnItemSelectedListener()
{ |
03 | public void onItemSelected(AdapterView<?>
parent,Viewview, |
05 | String
str=parent.getItemAtPosition(position).toString(); |
06 | Toast.makeText(SpinnerActivity. this , "你点击的是:" +str, 2000 ).show(); |
09 | public void onNothingSelected(AdapterView<?>
parent){ |
10 | //
TODOAuto-generatedmethodstub |
(二)使用自定义的Adapter(重点)
①:定义每一个Item的布局文件
01 | <? xml version = "1.0" encoding = "utf-8" ?> |
02 | < LinearLayout xmlns:android = "http://schemas.android.com/apk/res/android" |
03 | android:layout_width = "match_parent" |
04 | android:layout_height = "match_parent" |
05 | android:orientation = "horizontal" > |
08 | android:id = "@+id/textView1" |
09 | android:layout_width = "wrap_content" |
10 | android:layout_height = "wrap_content" |
11 | android:drawableLeft = "@drawable/ic_launcher" |
12 | android:paddingRight = "8dip" |
13 | android:paddingTop = "8dip" |
14 | android:text = "TextView" |
15 | android:textSize = "25sp" /> |
18 | android:id = "@+id/textView2" |
19 | android:layout_width = "wrap_content" |
20 | android:layout_height = "wrap_content" |
21 | android:paddingLeft = "8dip" |
22 | android:paddingTop = "8dip" |
23 | android:text = "TextView" |
24 | android:textSize = "25sp" /> |
②:建立Person类:
01 | package com.jiangqq.csdn; |
03 | private String
personName; |
04 | private String
personAddress; |
05 | public Person(String personName,StringpersonAddress){ |
07 | this .personName
=personName; |
08 | this .personAddress
=personAddress; |
10 | public String
getPersonName(){ |
13 | public void setPersonName(String
personName){ |
14 | this .personName
=personName; |
16 | public String
getPersonAddress(){ |
19 | public void setPersonAddress(String
personAddress){ |
20 | this .personAddress
=personAddress; |
③:创建MyAdapter继承与BaseAdapter,进行适配:
01 | package com.jiangqq.csdn; |
04 | import android.content.Context; |
05 | import android.view.LayoutInflater; |
06 | import android.view.View; |
07 | import android.view.ViewGroup; |
08 | import android.widget.BaseAdapter; |
09 | import android.widget.TextView; |
13 | * @authorjiangqq<ahref=http://blog.csdn.net/jiangqq781931404></a> |
16 | public class MyAdapter extends BaseAdapter
{ |
17 | private List<Person>
mList; |
18 | private Context
mContext; |
20 | public MyAdapter(Context pContext,List<Person>pList){ |
21 | this .mContext =pContext; |
31 | public Object
getItem( int position)
{ |
32 | return mList.get(position); |
36 | public long getItemId( int position)
{ |
43 | public View
getView( int position, ViewconvertView,ViewGroupparent){ |
44 | LayoutInflater
_LayoutInflater=LayoutInflater.from(mContext); |
45 | convertView=_LayoutInflater.inflate(R.layout.item, null ); |
48 | TextView
_TextView1=(TextView)convertView.findViewById(R.id.textView1); |
49 | TextView
_TextView2=(TextView)convertView.findViewById(R.id.textView2); |
50 | _TextView1.setText(mList.get(position).getPersonName()); |
51 | _TextView2.setText(mList.get(position).getPersonAddress()); |
④:在Activity中加入如下代码:
02 | mSpinner
=(Spinner)findViewById(R.id.spinner1); |
04 | List<Person>
persons= new ArrayList<Person>(); |
05 | persons.add( new Person( "张三" , "上海
" )); |
06 | persons.add( new Person( "李四" , "上海
" )); |
07 | persons.add( new Person( "王五" , "北京" )); |
08 | persons.add( new Person( "赵六" , "广州
" )); |
10 | MyAdapter
_MyAdapter= new MyAdapter( this ,
persons); |
12 | mSpinner.setAdapter(_MyAdapter); |
运行效果如下截图:
监听事件和第一种方法相同:
转自:http://blog.csdn.net/jiangqq781931404/article/details/7285623