android Spinner 例子

<?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"
>

<TextView
android: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"/>

<Spinner
android: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>

<?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" >

<ImageView
android: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" />

<TextView
android: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>

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;

@Override
protected 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() {
@Override
public 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());
}

@Override
public 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;
}
}