Spinner下拉選單

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 資料來源
        data = new ArrayList();
        data.add("北京");
        data.add("上海");
        data.add("廣州");
        data.add("重慶");

        data_list = new ArrayList<Map<String , Object>>();
        //2 介面卡
        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 介面卡樣式
        //adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
        adapter.setDropDownViewResource(R.layout.item);

        //4 注入介面卡
       // 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","廣州");
        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>