android常用UI使用案例：Spinner

<?xml version="1.0" encoding="utf-8"?>
<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:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="城市" />

    <Spinner
        android:id="@+id/spinner_city"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:drawSelectorOnTop="false" />

    <TextView
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="城区 (xml资源文件)" />

    <Spinner
        android:id="@+id/spinner_district"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:drawSelectorOnTop="false" />

</LinearLayout>

<resources>

    <string-array name="district">
        <item>海淀</item>
        <item>昌平</item>
        <item>丰台</item>
        <item>朝阳</item>
        <item>东城</item>
    </string-array>

</resources>

package com.test.androidui;

import java.util.ArrayList;
import java.util.List;

import android.app.Activity;
import android.os.Bundle;
import android.widget.ArrayAdapter;
import android.widget.AutoCompleteTextView;
import android.widget.CheckBox;
import android.widget.Spinner;

public class MainActivity extends Activity {

    Spinner spinner_city;
    Spinner spinner_district;
    private ArrayAdapter<String> cityAdapter;
    private List<String> cityList;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        setviewdata();
    }

    private static final String[] citys = { "北京", "上海", "深圳"};

    private void setviewdata() {
        spinner_city = (Spinner) findViewById(R.id.spinner_city);
        cityList = new ArrayList<String>();
        for (int i = 0; i < citys.length; i++) {
            cityList.add(citys[i]);
        }
        cityAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item, cityList);
        cityAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
        spinner_city.setAdapter(cityAdapter);

        spinner_district = (Spinner) findViewById(R.id.spinner_district);
        ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(this, R.array.district,
                android.R.layout.simple_spinner_item);
        adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
        spinner_district.setAdapter(adapter);
    }
}