为什么80%的码农都做不了架构师？>>> 
一、主xml:activity_main.xml
<?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:orientation="vertical"><TextViewandroid:id="@+id/tvInput"android:layout_width="fill_parent"android:layout_height="wrap_content"android:text="你选择的是"android:textSize="25dp"android:textColor="#ff0000"/><Spinnerandroid:layout_width="fill_parent"android:layout_height="wrap_content"android:id="@+id/spinner"android:layout_below="@+id/tvInput"android:layout_alignParentLeft="true"android:layout_alignParentStart="true" />
</LinearLayout>二，spinner下拉样式的xml:item.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="match_parent"android:layout_height="match_parent" ><ImageViewandroid:id="@+id/imageView"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_alignParentLeft="true"android:layout_centerVertical="true"android:layout_marginLeft="10dp"android:src="@mipmap/ic_launcher" /><TextViewandroid:id="@+id/tvItem"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_centerVertical="true"android:layout_marginLeft="20dp"android:layout_toRightOf="@id/imageView"android:text="None" /></RelativeLayout>三、Activity Java文件：
package com.demo.yaokj.spinnerdemo;import android.support.v7.app.AppCompatActivity;
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 java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;public class MainActivity extends AppCompatActivity {private TextView textView;private Spinner spinner;private List<Map<String,Object>> dataList ;private SimpleAdapter simpleAdapter;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);textView = (TextView) findViewById(R.id.tvInput);spinner = (Spinner) findViewById(R.id.spinner);dataList = getDatas();simpleAdapter = new SimpleAdapter(this,dataList,R.layout.item,new String[]{"pic","text"},new int[]{R.id.imageView,R.id.tvItem});spinner.setAdapter(simpleAdapter);spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {@Overridepublic void onItemSelected(AdapterView<?> parent, View view, int position, long id) {Map<String,Object> map = (Map<String,Object>)simpleAdapter.getItem(position);textView.setText("您选择的是："+map.get("text").toString());}@Overridepublic void onNothingSelected(AdapterView<?> parent) {textView.setText("NONE");}});}private List<Map<String,Object>> getDatas(){dataList = new ArrayList<>();dataList.add(getData("北京"));dataList.add(getData("上海"));dataList.add(getData("广州"));dataList.add(getData("深圳"));return dataList;}private Map<String ,Object> getData(String city){Map<String,Object> map = new HashMap<>();map.put("pic",R.mipmap.ic_launcher);map.put("text",city);return map;}
}四、运行例子的结果为：
