1 ：Android中Spinner下拉列表(使用ArrayAdapter和自定義Adapter實(shí)現(xiàn)) .

今天學(xué)習(xí)了Spinner組件，使用Spinner相當(dāng)于從下拉列表中選擇項(xiàng)目，下面演示一下Spinner的使用(分別使用ArrayAdapter和自定義Adapter實(shí)現(xiàn))

(一):使用ArrayAdapter進(jìn)行適配數(shù)據(jù):

①:首先定義一個(gè)布局文件:

android:layout_width="fill_parent"

android:layout_height="fill_parent"

android:orientation="vertical" >

android:id="@+id/spinner1"

android:layout_width="match_parent"

android:layout_height="wrap_content"

/>

②:建立數(shù)據(jù)源，使用數(shù)組,這些數(shù)據(jù)將會(huì)在Spinner下來(lái)列表中進(jìn)行顯示:

北京

上海

廣州

深圳

③:接著在Activity中加入如下的代碼(使用了系統(tǒng)定義的下拉列表的布局文件，當(dāng)然也可以自定義)

// 初始化控件

mSpinner = (Spinner) findViewById(R.id.spinner1);

// 建立數(shù)據(jù)源

String[] mItems = getResources().getStringArray(R.array.spinnername);

// 建立Adapter并且綁定數(shù)據(jù)源

ArrayAdapter _Adapter=new ArrayAdapter(this,android.R.layout.simple_spinner_item, mItems);

//綁定 Adapter到控件

mSpinner.setAdapter(_Adapter);

下面是關(guān)于Spinner的點(diǎn)擊事件(效果圖如上圖):

mSpinner.setOnItemSelectedListener(new OnItemSelectedListener() {

@Override

public void onItemSelected(AdapterView parent, View view,

int position, long id) {

String str=parent.getItemAtPosition(position).toString();

Toast.makeText(SpinnerActivity.this, "你點(diǎn)擊的是:"+str, 2000).show();

}

@Override

public void onNothingSelected(AdapterView parent) {

// TODO Auto-generated method stub

}

});

(二)使用自定義的Adapter(重點(diǎn))

①:定義每一個(gè)Item的布局文件

android:layout_width="match_parent"

android:layout_height="match_parent"

android:orientation="horizontal" >

android:id="@+id/textView1"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:drawableLeft="@drawable/ic_launcher"

android:paddingRight="8dip"

android:paddingTop="8dip"

android:text="TextView"

android:textSize="25sp" />

android:id="@+id/textView2"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:paddingLeft="8dip"

android:paddingTop="8dip"

android:text="TextView"

android:textSize="25sp" />

②:建立Person類：

package com.jiangqq.csdn;

public class Person {

private String personName;

private String personAddress;

public Person(String personName, String personAddress) {

super();

this.personName = personName;

this.personAddress = personAddress;

}

public String getPersonName() {

return personName;

}

public void setPersonName(String personName) {

this.personName = personName;

}

public String getPersonAddress() {

return personAddress;

}

public void setPersonAddress(String personAddress) {

this.personAddress = personAddress;

}

}

③:創(chuàng)建MyAdapter繼承與BaseAdapter,進(jìn)行適配:

package com.jiangqq.csdn;

import java.util.List;

import android.content.Context;

import android.view.LayoutInflater;

import android.view.View;

import android.view.ViewGroup;

import android.widget.BaseAdapter;

import android.widget.TextView;

/**

* 自定義適配器類

* @author jiangqq

*

*/

public class MyAdapter extends BaseAdapter {

private List mList;

private Context mContext;

public MyAdapter(Context pContext, List pList) {

this.mContext = pContext;

this.mList = pList;

}

@Override

public int getCount() {

return mList.size();

}

@Override

public Object getItem(int position) {

return mList.get(position);

}

@Override

public long getItemId(int position) {

return position;

}

/**

* 下面是重要代碼

*/

@Override

public View getView(int position, View convertView, ViewGroup parent) {

LayoutInflater _LayoutInflater=LayoutInflater.from(mContext);

convertView=_LayoutInflater.inflate(R.layout.item, null);

if(convertView!=null)

{

TextView _TextView1=(TextView)convertView.findViewById(R.id.textView1);

TextView _TextView2=(TextView)convertView.findViewById(R.id.textView2);

_TextView1.setText(mList.get(position).getPersonName());

_TextView2.setText(mList.get(position).getPersonAddress());

}

return convertView;

}

}

④:在Activity中加入如下代碼:

// 初始化控件

mSpinner = (Spinner) findViewById(R.id.spinner1);

// 建立數(shù)據(jù)源

List persons=new ArrayList ();

persons.add(new Person("張三", "上海 "));

persons.add(new Person("李四", "上海 "));

persons.add(new Person("王五", "北京" ));

persons.add(new Person("趙六", "廣州 "));

// 建立Adapter綁定數(shù)據(jù)源

MyAdapter _MyAdapter=new MyAdapter(this, persons);

//綁定Adapter

mSpinner.setAdapter(_MyAdapter);