Spinner下拉列表

package com.example.administrator.spinner;

import android.content.Context;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.SimpleAdapter;
import android.widget.Spinner;
import android.widget.TextView;
import android.widget.Toast;

import java.lang.reflect.Array;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.HashMap;

public class MainActivity extends ActionBarActivity implements Spinner.OnItemSelectedListener{
private TextView textView;
private Spinner spinner;
private List data;
private List<Map<String,Object>> data_list;

private Context mContext;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

mContext = this;
textView = (TextView)findViewById(R.id.text);
spinner = (Spinner)findViewById(R.id.spinner);

//1 数据源
data = new ArrayList();
data.add("北京");
data.add("上海");
data.add("广州");
data.add("重庆");

data_list = new ArrayList<Map<String , Object>>();
//2 适配器
ArrayAdapter adapter = new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1,data);
SimpleAdapter s_adapter = new SimpleAdapter(this,getData(),R.layout.item,new String[]{"text","pic"},new int[]{R.id.text,R.id.pic});

//3 适配器样式
//adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
adapter.setDropDownViewResource(R.layout.item);

//4 注入适配器
// spinner.setAdapter(adapter);
spinner.setAdapter(s_adapter);
spinner.setOnItemSelectedListener(this);
}

@Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
textView.setText(spinner.getItemAtPosition(position).toString());
}

@Override
public void onNothingSelected(AdapterView<?> parent) {
Toast.makeText(mContext,"NotingSelected",Toast.LENGTH_SHORT);
}

private List<Map<String,Object>> getData(){
Map<String,Object> map = new HashMap<String, Object>();
map.put("text","上海");
map.put("pic",R.mipmap.ic_launcher);
data_list.add(map);

map = new HashMap<String, Object>();
map.put("text","北京");
map.put("pic",R.mipmap.ic_launcher);
data_list.add(map);

map = new HashMap<String, Object>();
map.put("text","深圳");
map.put("pic",R.mipmap.ic_launcher);
data_list.add(map);

map = new HashMap<String, Object>();
map.put("text","广州");
map.put("pic",R.mipmap.ic_launcher);
data_list.add(map);

return data_list;
}
}

item.xml

<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" tools:context=".MainActivity">
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@mipmap/ic_launcher"
android:id="@+id/pic"
/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/text"
android:text="文字"
android:layout_toRightOf="@id/pic"
android:textSize="20sp"
android:layout_marginTop="10dp"
/>
</RelativeLayout>