Android Spinner详解

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main.xml布局文件

[html] view plaincopy

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context=".MainActivity"
android:orientation="vertical">
<TextView
android:id="@+id/selectTextview"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/hello_world" />
<Spinner android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:id="@+id/spinner" />
</LinearLayout>

item.xml布局文件

item.xml布局文件实现了控件两端对齐：实现两端对齐，我们采用中间增加一个控件的方式实现，并设置属性weight=1。

[html] view plaincopy

<?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="wrap_content"
android:orientation="horizontal" >
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="TextView"
android:textSize="20sp" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1" />
<TextView
android:id="@+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="TextView"
android:textSize="20sp" />
</LinearLayout>

movie.java

[java] view plaincopy

package com.andieguo.myspinnerdemo;
public class Movie {
private String imageName;
private String name;
private Double time;
public Movie(String name, Double time) {
super();
this.name = name;
this.time = time;
}
public String getImageName() {
return imageName;
}
public void setImageName(String imageName) {
this.imageName = imageName;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public Double getTime() {
return time;
}
public void setTime(Double time) {
this.time = time;
}
}

MyAdapter.java

[java] view plaincopy

<pre name="code" class="java">package com.andieguo.myspinnerdemo;
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;
public class MyAdapter extends BaseAdapter {
private List<Movie> list;
private Context context;// 上下文
public MyAdapter(List<Movie> list, Context context) {
super();
this.list = list;
this.context = context;
}
public final class ListItemView {//缓存的价值
public TextView textView1;
public TextView textView2;
}
@Override
public int getCount() {
// TODO Auto-generated method stub
return list.size();
}
@Override
public Object getItem(int position) {
// TODO Auto-generated method stub
return list.get(position);
}
@Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return position;
}
// getView什么时候执行
@Override
public View getView(int position, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
LayoutInflater layoutInflater = LayoutInflater.from(context);// //创建视图容器工厂并设置上下文
ListItemView listView = null;
if (convertView == null) {
convertView = layoutInflater.inflate(R.layout.item, null); // 创建list_item.xml布局文件的视图
listView = new ListItemView();
listView.textView1 = (TextView) convertView.findViewById(R.id.textView1);
listView.textView2 = (TextView) convertView.findViewById(R.id.textView2);
convertView.setTag(listView);
} else {
listView = (ListItemView) convertView.getTag();
}
listView.textView1.setText(list.get(position).getName());
listView.textView2.setText(list.get(position).getTime() + "min");
return convertView;
}
}</pre>

MainActivity.java

[java] view plaincopy

package com.andieguo.myspinnerdemo;
import java.util.ArrayList;
import java.util.List;
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemSelectedListener;
import android.widget.Spinner;
import android.widget.TextView;
public class MainActivity extends Activity {
private Spinner spinner = null;
private TextView selectTextview = null;
private MyAdapter myAdapter = null;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
spinner = (Spinner) findViewById(R.id.spinner);
selectTextview = (TextView) findViewById(R.id.selectTextview);
List<Movie> movies = new ArrayList<Movie>();
for(int i=0;i<2;i++){//添加数据
movies.add(new Movie("微爱",100.0));
movies.add(new Movie("天下",100.0));
movies.add(new Movie("火影忍者", 60.0));
}
myAdapter = new MyAdapter(movies,this);
spinner.setAdapter(myAdapter);
spinner.setOnItemSelectedListener(new OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> parent, View view,
int position, long id) {
// TODO Auto-generated method stub
selectTextview.setText("你选择的电影是：" + ((Movie)myAdapter.getItem(position)).getName());
}
@Override
public void onNothingSelected(AdapterView<?> parent) {
// TODO Auto-generated method stub
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
}

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