Android学习笔记之Spinner下拉列表使用案例

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（1）两种方法提冲Spinner中的数据源：通过list集合，或者是通过xml文件进行配置

（2）布局代码如下：

<RelativeLayout 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" >    <TextView        android:id="@+id/textView1"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignParentLeft="true"        android:layout_alignParentTop="true"        android:layout_marginTop="46dp"        android:text="所属城市"        android:textSize="22sp" />    <Spinner        android:id="@+id/spinner1"        android:layout_width="200sp"        android:layout_height="wrap_content"        android:layout_alignParentTop="true"        android:layout_marginTop="44dp"        android:layout_toRightOf="@+id/textView1" />    <TextView        android:id="@+id/textView2"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignRight="@+id/textView1"        android:layout_centerVertical="true"        android:text="所属星球" />    <Spinner        android:id="@+id/spinner2"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignLeft="@+id/spinner1"        android:layout_alignTop="@+id/textView2"        android:layout_marginLeft="21dp" /></RelativeLayout>

（2）

package com.example.spinners;import java.util.ArrayList;import java.util.List;import android.app.Activity;import android.os.Bundle;import android.view.Menu;import android.view.View;import android.widget.AdapterView;import android.widget.AdapterView.OnItemSelectedListener;import android.widget.ArrayAdapter;import android.widget.Spinner;import android.widget.Toast;/** * 通过继承OnItemSelectedListener接口来实现选择时的事件 * @author xuliugen * */public class MainActivity extends Activity implements OnItemSelectedListener {private Spinner spinner1;private Spinner spinner2;// private SpinnerAdapter spinnerAdapter;private ArrayAdapter<String> adapter;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);spinner1 = (Spinner) this.findViewById(R.id.spinner1);spinner2 = (Spinner) this.findViewById(R.id.spinner2);// 第一种手工输入的listadapter = new ArrayAdapter<String>(MainActivity.this,android.R.layout.simple_spinner_item, getDataSource());spinner1.setAdapter(adapter);//注册监听器spinner1.setOnItemSelectedListener(this);// 第二种：通过加载xml文件配置的数据源ArrayAdapter adapter2 = ArrayAdapter.createFromResource(this,R.array.planets_array, android.R.layout.simple_spinner_item);adapter2.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);spinner2.setAdapter(adapter2);}/* * 通过第一种方法：手工输入的list */public List<String> getDataSource() {List<String> list = new ArrayList<String>();list.add("beijing");list.add("beida");list.add("shahai");list.add("shangjing");list.add("shanglian");list.add("chengdu");return list;}@Overridepublic boolean onCreateOptionsMenu(Menu menu) {getMenuInflater().inflate(R.menu.main, menu);return true;}@Overridepublic void onItemSelected(AdapterView<?> parent, View view, int position,long id) {String itemString = spinner1.getItemAtPosition(position).toString();Toast.makeText(this, "你选中的是" + itemString, 1).show();}@Overridepublic void onNothingSelected(AdapterView<?> parent) {}}

（4）资源文件中的配置如下：

<?xml version="1.0" encoding="utf-8"?><resources>    <string name="app_name">Spinners</string>    <string name="action_settings">Settings</string>    <string name="hello_world">Hello world!</string>    <string-array name="planets_array">        <item>Mercury</item>        <item>Venus</item>        <item>Earth</item>        <item>Mars</item>        <item>Jupiter</item>        <item>Saturn</item>        <item>Uranus</item>        <item>Neptune</item>    </string-array></resources>

（5）运行结果如下所示：

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