二级联动_hui的两级联动-优快云博客

本文介绍了一个基于Android平台实现的省份与城市二级联动选择器。通过Spinner组件并结合ArrayAdapter及SimpleAdapter实现动态更新子级数据的功能。文章展示了具体的XML布局文件及Java代码实现细节。

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二级联动下拉框的效果图

xml页面

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
              android:orientation="vertical"
              android:layout_width="match_parent"
              android:layout_height="match_parent">

   <LinearLayout
       android:layout_width="wrap_content"
       android:layout_height="wrap_content"
       android:orientation="horizontal">
       <Spinner
           android:layout_width="wrap_content"
           android:layout_height="wrap_content"
           android:id="@+id/home_Spinner"></Spinner>
       <Spinner
           android:layout_width="wrap_content"
           android:layout_height="wrap_content"
           android:id="@+id/home_Spinner2"></Spinner>
   </LinearLayout>




</LinearLayout>

Java代码

package com.example.app11;

import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.SimpleAdapter;
import android.widget.Spinner;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
 * Created by Administrator on 2017/6/8 0008.
 */

public class HomeActivity extends AppCompatActivity{

    private Spinner spinner;
    private Spinner spinner2;
    private SimpleAdapter simpleAdapter;
    int index=0;
    private ArrayAdapter arrayAdapter;
    private Map<String, String[]> maps;
    private List<String> provinces;
    private List<Integer> images;

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.home);
        spinner = (Spinner) findViewById(R.id.home_Spinner);
        spinner2 = (Spinner) findViewById(R.id.home_Spinner2);
        //设置图片的集合
        images = new ArrayList<>();
        images.add(R.drawable.dog);
        images.add(R.drawable.elephant);
        images.add(R.drawable.fish);
        provinces = new ArrayList<>();
        provinces.add("湖南");
        provinces.add("湖北");
        provinces.add("甘肃");
        //首先将省加入集合
        List<Map<String ,Object>> list=new ArrayList<>();
        for (int i = 0; i < provinces.size(); i++) {
            Map<String,Object> map=new HashMap<>();
            map.put("provinces", provinces.get(i));
            map.put("images",images.get(i));
            list.add(map);
        }
        String [] city1={"长沙","娄底","衡阳"};
        String [] city2={"武汉","黄石","襄阳"};
        String [] city3={"兰州","白银","平凉"};
        String [][]citys={city1,city2,city3};

        //定义map，给每个省添加市
        maps = new HashMap<>();
        for (int i = 0; i < provinces.size(); i++) {
            maps.put(provinces.get(i),citys[i]);
        }

        simpleAdapter = new SimpleAdapter(this,list,android.R.layout.activity_list_item,new String[]{"provinces","images"},new int[]{android.R.id.text1,android.R.id.icon});
        spinner.setAdapter(simpleAdapter);
        //给市设置
        arrayAdapter = new ArrayAdapter(this,android.R.layout.simple_list_item_1, maps.get(provinces.get(index)));
        spinner2.setAdapter(arrayAdapter);
        //给下拉列表
        spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
            @Override
            public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
                index=position;
                arrayAdapter = new ArrayAdapter(HomeActivity.this,android.R.layout.simple_list_item_1, maps.get(provinces.get(index)));
                spinner2.setAdapter(arrayAdapter);
            }

            @Override
            public void onNothingSelected(AdapterView<?> parent) {

            }
        });
    }
}