Android_Spinner实现下拉选择菜单

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XML文件：

<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"    android:paddingBottom="@dimen/activity_vertical_margin"    android:paddingLeft="@dimen/activity_horizontal_margin"    android:paddingRight="@dimen/activity_horizontal_margin"    android:paddingTop="@dimen/activity_vertical_margin"    tools:context="com.example.zj.MainActivity" ><TextView    android:id="@+id/textView"    android:layout_width="match_parent"    android:layout_height="wrap_content"     android:textSize="25dp"    android:textColor="#ff0000"    /><Spinner    android:id="@+id/spinner"    android:layout_width="match_parent"    android:layout_height="wrap_content"    android:layout_alignLeft="@+id/textView"    android:layout_below="@+id/textView"    android:layout_marginTop="37dp" /></RelativeLayout>

MainActivity.java文件：

package com.example.zj;import java.util.ArrayList;import java.util.List;import android.app.Activity;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 Activity implements OnItemSelectedListener {    private TextView textView;    private Spinner spinner;    private List<String> list;    private ArrayAdapter adapter;     @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);         textView = (TextView) findViewById(R.id.textView);        spinner = (Spinner) findViewById(R.id.spinner);        textView.setText("你选择的城市是北京");        //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.设置数组适配器（ArrayAdapter）        adapter = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item, list);        //3.adapter设置一个下拉表样式        adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);        //4.spinner适配器        spinner.setAdapter(adapter);        //5.设置spinner监听器        spinner.setOnItemSelectedListener(this);    }    @Override    public void onItemSelected(AdapterView<?> parent, View view, int position,            long id) {        // TODO Auto-generated method stub        String city = (String) adapter.getItem(position);        //String city = list.get(position);        textView.setText("你选择的城市是"+city);    }    @Override    public void onNothingSelected(AdapterView<?> parent) {        // TODO Auto-generated method stub    }}

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