Android中Spinner下拉列表（运用ArrayAdapter和自

1 ：Android中Spinner下拉列表(运用ArrayAdapter和自界说Adapter完成) .

今日学习了Spinner组件，运用Spinner相当于从下拉列表中选择项目，下面演示一下Spinner的运用(别离运用ArrayAdapter和自界说Adapter完成)

(一):运用ArrayAdapter进行适配数据:

①:首要界说一个布局文件:

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:树立数据源，运用数组,这些数据将会在Spinner下来列表中进行显现:

北京

上海

广州

深圳

③:接着在Activity中参加如下的代码(运用了体系界说的下拉列表的布局文件，当然也能够自界说)

// 初始化控件

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

// 树立数据源

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

// 树立Adapter而且绑定数据源

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

//绑定 Adapter到控件

mSpinner.setAdapter(_Adapter);

下面是关于Spinner的点击事情(效果图如上图):

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, 你点击的是:+str, 2000).show();

}

@Override

public void onNothingSelected(AdapterView parent) {

// TODO Auto-generated method stub

}

});

(二)运用自界说的Adapter(要点)

①:界说每一个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:树立Person类：

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:创立MyAdapter承继与BaseAdapter,进行适配:

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;

/**

* 自界说适配器类

* @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;

}

/**

* 下面是重要代码

*/

@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中参加如下代码:

// 初始化控件

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

// 树立数据源

List persons=new ArrayList();

persons.add(new Person(张三, 上海 ));

persons.add(new Person(李四, 上海 ));

persons.add(new Person(王五, 北京 ));

persons.add(new Person(赵六, 广州 ));

// 树立Adapter绑定数据源

MyAdapter _MyAdapter=new MyAdapter(this, persons);

//绑定Adapter

mSpinner.setAdapter(_MyAdapter);