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

<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="com.example.spinner.MainActivity" >

    <Spinner android:layout_width="match_parent"
        android:layout_height="wrap_content"

        android:id="@+id/spn"
        android:dropDownWidth="200dp"/>

    <Spinner android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@id/spn"
        android:id="@+id/city"
        android:dropDownWidth="200dp"/>
    <Spinner android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@id/city"
        android:id="@+id/counstryside"
        android:dropDownWidth="200dp"/>

</RelativeLayout>

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<String> 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。