android下拉菜单三级联动
16lz
2021-01-23
android中的下拉菜单联动应用非常普遍，android中的下拉菜单用Spinner就能实现，以下列子通过简单的代码实现三级菜单联动。
一 样式文件
二 联动逻辑代码
package com.example.spinner;import android.app.Activity;import android.os.Bundle;import android.view.View;import android.widget.AdapterView;import android.widget.AdapterView.OnItemSelectedListener;import android.widget.ArrayAdapter;import android.widget.Spinner;/** * @author ZMC * 三级联动主要是灵活的应用三维数组 */public class MainActivity extends Activity {private String province[] = new String[]{"江西","湖南"};private Spinner spinner1,spinner2,spinner3;private int provinceindex;private String city [][] = {{"南昌","赣州"},{"长沙","湘潭"}};private String counstryside [][][] = {{{"青山湖区","南昌县"},{"章贡区","赣县"}},{{"长沙县","沙县"},{"湘潭县","象限"}}};ArrayAdapter adapter1,adapter2,adapter3;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);spinner1 = (Spinner) findViewById(R.id.spn);adapter1 = new ArrayAdapter<>(this, android.R.layout.simple_dropdown_item_1line,province);spinner1.setAdapter(adapter1);spinner2 = (Spinner)findViewById(R.id.city);adapter2 = new ArrayAdapter<>(this, android.R.layout.simple_dropdown_item_1line,city[0]);spinner2.setAdapter(adapter2);spinner3 = (Spinner)findViewById(R.id.counstryside);adapter3 = new ArrayAdapter<>(this, android.R.layout.simple_dropdown_item_1line,counstryside[0][0]);spinner3.setAdapter(adapter3);spinner1.setOnItemSelectedListener(new OnItemSelectedListener() {@Overridepublic void onItemSelected(AdapterView<?> parent, View view,int position, long id) {// TODO Auto-generated method stubprovinceindex = position;adapter2 = new ArrayAdapter<>(MainActivity.this, android.R.layout.simple_dropdown_item_1line,city[position]);spinner2.setAdapter(adapter2);}@Overridepublic void onNothingSelected(AdapterView<?> parent) {// TODO Auto-generated method stub}});spinner2.setOnItemSelectedListener(new OnItemSelectedListener() {@Overridepublic void onItemSelected(AdapterView<?> parent, View view,int position, long id) {// TODO Auto-generated method stubadapter3 = new ArrayAdapter<>(MainActivity.this, android.R.layout.simple_dropdown_item_1line,counstryside[provinceindex][position]);//adapter3.notifyDataSetChanged();spinner3.setAdapter(adapter3);}@Overridepublic void onNothingSelected(AdapterView<?> parent) {// TODO Auto-generated method stub//当时据为空的时候触发的}});}} 三 结果：
四 总结
三级联动主要是灵活的应用三维数组，这样能很方便的通过数组索引将三个菜单关联，同时通过设置Spinner的setOnItemSelectedListener来监听选择的动作，动态设置下拉菜单的内容。更多相关文章
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