Android使用Spinner实现下拉列表

实现效果

activity_main.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="fill_parent"    android:layout_height="fill_parent"    android:orientation="vertical" >        <TextView         android:id="@+id/textView"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:textSize="25sp"        android:textColor="#ff0000"        android:text="文字"        />        <Spinner         android:id="@+id/spinner"        android:layout_width="match_parent"        android:layout_height="wrap_content"        /></LinearLayout>

MainActivity.java

import java.util.ArrayList;import java.util.List;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.AdapterView.OnItemSelectedListener;import android.widget.ArrayAdapter;import android.widget.Spinner;import android.widget.TextView;public class MainActivity extends ActionBarActivity implements OnItemSelectedListener{    private Spinner spinner;    private TextView textView;    private List<String> list;    private ArrayAdapter<String> adapter;        @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);                spinner = (Spinner) findViewById(R.id.spinner);        textView = (TextView) findViewById(R.id.textView);        textView.setText("您选择的城市为北京");                //1.设置数据源        list  = new ArrayList<String>();        list.add("北京");        list.add("上海");        list.add("广州");        list.add("深圳");                //2.新建ArrayAdapter(数组适配器)        adapter = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item, list);                //3.adapter设置下拉列表样式        adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);                //4.spinner加载适配器和监听器        spinner.setAdapter(adapter);        spinner.setOnItemSelectedListener(this);    }    @Override    public void onItemSelected(AdapterView<?> parent, View view, int position,long id) {        String cityName = adapter.getItem(position);        //String cityName = list.get(position);        textView.setText("您选择的城市为"+cityName);    }    @Override    public void onNothingSelected(AdapterView<?> parent) {            }}

使用SimpleAdapter实现文图效果

使用自定义的下拉style

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent" >        <ImageView         android:id="@+id/image"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_marginLeft="10dp"        android:layout_alignParentLeft="true"        android:layout_centerVertical="true"        android:src="@drawable/ic_launcher"        />        <TextView         android:id="@+id/text"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_centerVertical="true"        android:layout_marginLeft="20dp"        android:layout_toRightOf="@id/image"        android:text="None"        /></RelativeLayout>

import java.util.ArrayList;import java.util.HashMap;import java.util.List;import java.util.Map;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.AdapterView.OnItemSelectedListener;import android.widget.ArrayAdapter;import android.widget.SimpleAdapter;import android.widget.Spinner;import android.widget.TextView;public class MainActivity extends ActionBarActivity implements OnItemSelectedListener{    private Spinner spinner;    private TextView textView;    private List<Map<String, Object>> datalist;    private SimpleAdapter adapter;    private int[] icon = {            R.drawable.ic_launcher,             R.drawable.ic_launcher,             R.drawable.ic_launcher,            R.drawable.ic_launcher};    private String[] icon_name = {            "北京",            "广州",             "上海",            "深圳"};        @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);                spinner = (Spinner) findViewById(R.id.spinner);        textView = (TextView) findViewById(R.id.textView);        textView.setText("您选择的城市为北京");                //1.设置数据源        datalist = new ArrayList<Map<String,Object>>();                //2.新建SimpleAdapter(数组适配器)        adapter = new SimpleAdapter(this, getData(), R.layout.item, new String[]{"image", "text"}, new int[]{R.id.image, R.id.text});                //3.adapter设置下拉列表样式        adapter.setDropDownViewResource(R.layout.item);                //4.spinner加载适配器和监听器        spinner.setAdapter(adapter);        spinner.setOnItemSelectedListener(this);    }        private List<Map<String, Object>> getData(){        for(int i = 0; i < icon.length; i++){            Map<String, Object> map = new HashMap<String, Object>();            map.put("image",     icon[i]);            map.put("text", icon_name[i]);            datalist.add(map);        }        return datalist;    }

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