Android控件之Spinner

ArrayAdapter

<span style="font-size:18px;">// 初始化控件
mSpinner = (Spinner) findViewById(R.id.spinner1);
// 建立数据源
String[] mItems = getResources().getStringArray(R.array.spinnername);
// 建立Adapter并且绑定数据源
ArrayAdapter<String> _Adapter=new ArrayAdapter<String>(this,android.R.layout.simple_spinner_item, mItems);
//绑定 Adapter到控件
mSpinner.setAdapter(_Adapter);</span>

自定义Adapter

创建每一项的布局文件

<span style="font-size:18px;"><?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/item_linearlayout"
android:orientation="horizontal" >

<ImageView
android:id="@+id/imageView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/ic_launcher" />

<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">

<TextView
android:id="@+id/tv_large"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Large Text"
android:textAppearance="?android:attr/textAppearanceLarge" />

<TextView
android:id="@+id/tv_small"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="TextView" />

</LinearLayout>

</LinearLayout></span>

创建数据源

<span style="font-size:18px;">package com.example.spinnertest;

public class Student {
private String name;
private String sex;
private int age;

public Student() {
super();
// TODO Auto-generated constructor stub
}
public Student(String name, String sex, int age) {
super();
this.name = name;
this.sex = sex;
this.age = age;
}

public String getName() {
return name;
}

public void setName(String name) {
this.name = name;
}

public String getSex() {
return sex;
}

public void setSex(String sex) {
this.sex = sex;
}

public int getAge() {
return age;
}

public void setAge(int age) {
this.age = age;
}
}</span>

自定义适配器

<span style="font-size:18px;">package com.example.spinnertest;

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.LinearLayout;
import android.widget.TextView;

public class MyAdapter extends BaseAdapter {
private List<Student> studentList;
private Context context;

public MyAdapter(List<Student> studentList, Context context) {
super();
this.studentList = studentList;
this.context = context;
}

@Override
public int getCount() {
// TODO Auto-generated method stub
return studentList.size();
}

@Override
public Student getItem(int position) {
// TODO Auto-generated method stub
return studentList.get(position);
}

@Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return position;
}

@Override
public View getView(int position, View convertView, ViewGroup parent) {
LinearLayout linearLayout = null;
if (convertView != null) {
linearLayout = (LinearLayout) convertView;
} else {
linearLayout = (LinearLayout) LayoutInflater.from(context).inflate(
R.layout.activity_item, null);
TextView tv_Name=(TextView) linearLayout.findViewById(R.id.tv_large);
TextView tv_Sex=(TextView) linearLayout.findViewById(R.id.tv_small);
tv_Name.setText(studentList.get(position).getName());
tv_Sex.setText(studentList.get(position).getSex());
}
return linearLayout;
}

}</span>

绑定数据并添加监听事件

<span style="font-size:18px;">package com.example.spinnertest;

import java.util.ArrayList;
import java.util.List;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.Toast;
import android.widget.AdapterView.OnItemSelectedListener;
import android.widget.Spinner;

public class MainActivity extends Activity {
private Spinner spinner;
private List<Student> students = new ArrayList<Student>();

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_spinner);

this.spinner = (Spinner) findViewById(R.id.view_spinner);
students.add(new Student("张三", "男", 18));
students.add(new Student("李四", "男", 20));
students.add(new Student("王五", "女", 19));
MyAdapter adapter = new MyAdapter(students, this);
spinner.setAdapter(adapter);
spinner.setOnItemSelectedListener(new OnItemSelectedListener() {

@Override
public void onItemSelected(AdapterView<?> parent, View view,
int position, long id) {
// TODO Auto-generated method stub
Toast.makeText(MainActivity.this,
students.get(position).getName(), Toast.LENGTH_SHORT)
.show();
}

@Override
public void onNothingSelected(AdapterView<?> parent) {
// TODO Auto-generated method stub

}
});
}
}</span><span style="font-size:24px;">
</span>

运行结果示意