Android练习——Spinner二级联动_城市选择

样式部分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"
    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=".MainActivity" >

    <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="请选择城市" />

    <Spinner
        android:id="@+id/spinner1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/textView1"
        android:layout_below="@+id/textView1" />

    <Spinner
        android:id="@+id/spinner2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/spinner1"
        android:layout_below="@+id/spinner1" />

</RelativeLayout>

arrays部分xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
   <string-array name="province">
        <item>-省份-</item>
        <item>北京市</item>
        <item>河北省</item>
    </string-array>
    <string-array name="hb">
        <item>-城市-</item>
        <item>承德市</item>
        <item>石家庄</item>
        <item>邯郸市</item>
        <item>邢台市</item>
        <item>廊坊市</item>
    </string-array>
    <string-array name="bj">
        <item>-城市-</item>
        <item>海淀区</item>
        <item>朝阳区</item>
        <item>崇文区</item>
        <item>昌平区</item>
    </string-array>
</resources>            

Activity 部分

package com.example.android_spinner;

import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Spinner;

public class MainActivity extends Activity {
    // 声明组件
    private Spinner sr1;
    private Spinner sr2;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        // 获取组件
        sr1 = (Spinner) this.findViewById(R.id.spinner1);
        sr2 = (Spinner) this.findViewById(R.id.spinner2);
        // 添加String数组
        String[] province = getResources().getStringArray(R.array.province);
        ;
        // 将数组配置器链接上预置的文件
        // ArrayAdapter<CharSequence> aa = new ArrayAdapter<CharSequence>(this,
        // android.R.layout.simple_spinner_item,province);

        // 这样就可以直接获取xml中的数组了
        ArrayAdapter<CharSequence> aa = ArrayAdapter.createFromResource(this,
                R.array.province, android.R.layout.simple_spinner_item);

        // 设置下拉菜单的样式
        aa.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
        // 将数据绑定到spinner上
        sr1.setAdapter(aa);

        // 添加监听事件

        sr1.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {

            @Override
            public void onItemSelected(AdapterView<?> arg0, View arg1,
                    int arg2, long arg3) {
                // 得到事件中选中的值
                Spinner s = (Spinner) arg0;
                String pro = (String) s.getItemAtPosition(arg2);
                ArrayAdapter<CharSequence> cityAdapter = null;
                // 获取所在省含有哪些市(从资源数组文件中获取数据)
                if (pro.equals("河北省")) {

                    cityAdapter = ArrayAdapter.createFromResource(
                            MainActivity.this, R.array.hb,
                            android.R.layout.simple_spinner_item);
                } else if (pro.equals("北京市")) {

                    cityAdapter = ArrayAdapter.createFromResource(
                            MainActivity.this, R.array.bj,
                            android.R.layout.simple_spinner_item);
                } 
                sr2.setAdapter(cityAdapter);
            }

            @Override
            public void onNothingSelected(AdapterView<?> arg0) {
                // TODO Auto-generated method stub

            }

        });

    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

}

实现效果：