如何借助SimpleAdapter和Spinner实现下拉列表

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这两天研究了一下利用SimpleAdapter和Spinner实现下拉列表的功能，现将代码与大家共享：

代码1—添加名为“SelectActivity.java”的文件：

package com.ghj.activity;import java.util.ArrayList;import java.util.HashMap;import java.util.List;import java.util.Map;import android.app.Activity;import android.os.Bundle;import android.view.View;import android.widget.AdapterView;import android.widget.SimpleAdapter;import android.widget.Spinner;import android.widget.TextView;import android.widget.Toast;public class SelectActivity extends Activity {private Spinner spinner;private SimpleAdapter simpleAdapter;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.select);spinner = (Spinner) findViewById(R.id.spinner);List<Map<String, String>> specialtyList = getSpinnerData();simpleAdapter = new SimpleAdapter(this, specialtyList, R.layout.select_item, new String[]{"id","name"}, new int[]{R.id.value, R.id.lable});spinner.setAdapter(simpleAdapter);setDefaultSpinner(specialtyList, "yingyu");//设置默认选中项spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {@Overridepublic void onItemSelected(AdapterView<?> parent, View view, int position, long id) {String lable = ((TextView) SelectActivity.this.findViewById(R.id.lable)).getText().toString();String value = ((TextView) SelectActivity.this.findViewById(R.id.value)).getText().toString();Toast.makeText(SelectActivity.this, lable + "→" + value, Toast.LENGTH_LONG).show();}@Overridepublic void onNothingSelected(AdapterView<?> parent) {}});}/** * 设置下拉列表默认选中项 *  * @author 高焕杰 */private void setDefaultSpinner(List<Map<String, String>> mapList, String id){for (int i = 0; i < mapList.size(); i++) {Map<String, String> map = mapList.get(i);if(id.equals(map.get("id"))){spinner.setSelection(i,true);break;}}}private List<Map<String, String>> getSpinnerData(){List<Map<String, String>> specialtyList = new ArrayList<Map<String, String>>();Map<String, String> map1 = new HashMap<String, String>();map1.put("id", "yuwen");map1.put("name", "语文");specialtyList.add(map1);Map<String, String> map2 = new HashMap<String, String>();map2.put("id", "shuxue");map2.put("name", "数学");specialtyList.add(map2);Map<String, String> map3 = new HashMap<String, String>();map3.put("id", "yingyu");map3.put("name", "英语");specialtyList.add(map3);return specialtyList;}}

代码2—添加名为“select_item_selector.xml”的文件：

<?xml version="1.0" encoding="utf-8"?><selector xmlns:android="http://schemas.android.com/apk/res/android">    <item android:state_pressed="true">        <shape>            <solid android:color="#60FFA500" />        </shape>    </item>        <item android:state_focused="true">        <shape>            <solid android:color="#60FFA500" />        </shape></item></selector>

代码3—添加名为“select.xml”的文件：

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent">        <Spinner        android:id="@+id/spinner"        android:layout_width="fill_parent"        android:layout_height="wrap_content"/></LinearLayout>

代码4—添加名为“select_item.xml”的文件：

<?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:background="@drawable/select_item_selector"    android:orientation="vertical" >    <TextView        android:id="@+id/lable"        android:layout_width="fill_parent"        android:layout_height="45dp"        android:gravity="center_vertical"        android:paddingLeft="12dp" />    <TextView        android:id="@+id/value"        android:layout_width="wrap_content"        android:layout_height="match_parent"        android:visibility="gone" /></LinearLayout>

代码5—修改文件名为“styles.xml”的文件：

<resources>    <!--        Base application theme, dependent on API level. This theme is replaced        by AppBaseTheme from res/values-vXX/styles.xml on newer devices.    -->    <style name="AppBaseTheme" parent="android:Theme.Light">        <!--            Theme customizations available in newer API levels can go in            res/values-vXX/styles.xml, while customizations related to            backward-compatibility can go here.        -->    </style>    <!-- Application theme. -->    <style name="AppTheme" parent="android:Theme.Light">        <!-- All customizations that are NOT specific to a particular API-level can go here. -->    </style></resources>

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