Android实现二级联动,二级联动是非常常见实用的功能,用的比较多的就是地址选择了,今天就给大家讲讲如何实现:
效果图:
布局文件:
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" android:orientation="vertical" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" tools:context="com.example.testandroid_0610.MainActivity"> <Spinner android:layout_width="match_parent" android:layout_height="wrap_content" android:id="@+id/s_main_spinner" ></Spinner> <Spinner android:layout_width="match_parent" android:layout_height="wrap_content" android:id="@+id/s_main_spinnerTwo" ></Spinner> </LinearLayout>
java代码:
package com.example.testandroid_0610;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.AutoCompleteTextView;
import android.widget.MultiAutoCompleteTextView;
import android.widget.SimpleAdapter;
import android.widget.Spinner;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
public class MainActivity extends AppCompatActivity {
private Spinner s_main_spinner;
private Spinner s_main_spinnerTwo;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//获取控件
s_main_spinner = (Spinner) findViewById(R.id.s_main_spinner);
s_main_spinnerTwo = (Spinner) findViewById(R.id.s_main_spinnerTwo);
//设置省份
final String provinces[]={"湖南省","河南省","海南省"};
//给省份设置图标
int images[]={R.mipmap.bird,R.mipmap.cat,R.mipmap.chicken};
//添加市
final Map<String,String[]> citys=new HashMap<String, String[]>();
citys.put("湖南省",new String[]{"长沙市","衡阳市","益阳市"});
citys.put("河南省",new String[]{"郑州市","许昌市","周口市"});
citys.put("海南省",new String[]{"海口市","三亚市","文昌市"});
//将图标添加进集合
List<Map<String,Object>> list=new ArrayList<>();
for (int i = 0; i < provinces.length; i++) {
Map<String,Object> map=new HashMap<>();
map.put("title",provinces[i]);
map.put("image",images[i]);
list.add(map);
}
//适配器
SimpleAdapter adapterSpinner=new SimpleAdapter(this,list,android.R.layout.activity_list_item,new String[]{"title","image"},new int[]{android.R.id.text1,android.R.id.icon});
//上面适配器引用的是系统布局,所以需要按照系统布局的方式来排列
s_main_spinner.setAdapter(adapterSpinner);
//给下拉列表设置选择事件
s_main_spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
//先根据下标拿到省份,再根据拿到的省份去集合中拿到市
String city[]=citys.get(provinces[position]);
//将拿到的市添加到适配器中
ArrayAdapter ada=new ArrayAdapter(MainActivity.this,android.R.layout.simple_list_item_1,city);
s_main_spinnerTwo.setAdapter(ada);
}
@Override
public void onNothingSelected(AdapterView<?> parent) {
}
});
}
}
代码非常简单,希望对大家有帮助。