android下拉菜单三级联动

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;
	@Override
	protected 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() {

			@Override
			public void onItemSelected(AdapterView parent, View view,
					int position, long id) {
				// TODO Auto-generated method stub
				provinceindex = position;
				adapter2 = new ArrayAdapter<>(MainActivity.this, android.R.layout.simple_dropdown_item_1line,city[position]);
				spinner2.setAdapter(adapter2);
			}

			@Override
			public void onNothingSelected(AdapterView parent) {
				// TODO Auto-generated method stub
				
			}
		});
		
		spinner2.setOnItemSelectedListener(new OnItemSelectedListener() {

			@Override
			public void onItemSelected(AdapterView parent, View view,
					int position, long id) {
				// TODO Auto-generated method stub
				
				adapter3 = new ArrayAdapter<>(MainActivity.this, android.R.layout.simple_dropdown_item_1line,counstryside[provinceindex][position]);
				//adapter3.notifyDataSetChanged();
				spinner3.setAdapter(adapter3);
			}

			@Override
			public 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。