Android简易实战教程--第四十二话《Spinner下拉级联效果》
本篇承接第四十话第四十话《Spinner》
参考博客:http://blog.csdn.net/yayun0516
进入正题:
Strings加入第一级数据:
<string-array name="province"> <item >水果</item> <item >职位</item> <item >动物</item> </string-array>
来个布局:
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="vertical" > <LinearLayout android:layout_width="fill_parent" android:layout_height="wrap_content" android:orientation="horizontal" > <Spinner android:id="@+id/spinner1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:entries="@array/province"/> <Spinner android:id="@+id/spinner2" android:layout_width="wrap_content" android:layout_height="wrap_content" /> </LinearLayout> <TextView android:text="nihao" android:id="@+id/text" android:textColor="#00ff00" android:layout_width="match_parent" android:layout_height="wrap_content" > </TextView> </LinearLayout>
总共两级菜单,一个文本。
主活动代码如下:
package com.ydl.test; 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; import android.widget.TextView; public class MainActivity extends Activity { private Spinner spinner1; private Spinner spinner2; private TextView textView; private String string1; private String[][] dataStrings = { { "苹果", "香蕉", "梨子", "菠萝", "草莓", }, { "教师", "工人", "程序员", }, { "老虎", "狮子", "大象", }, }; private ArrayAdapter<CharSequence> adapter = null; public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); // 生命周期方法 super.setContentView(R.layout.activity_main); // 设置要使用的布局管理器 spinner1 = (Spinner) findViewById(R.id.spinner1); spinner2 = (Spinner) findViewById(R.id.spinner2); textView = (TextView) findViewById(R.id.text); spinner1.setOnItemSelectedListener(new OnItemSelectedListener() { public void onItemSelected(AdapterView<?> parent, View view, int position, long id) { adapter = new ArrayAdapter<CharSequence>(MainActivity.this, android.R.layout.simple_spinner_item, dataStrings[position]);//根据position确定第二个spinner中要填充的数据 adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);//设置点击下拉窗体的显示样式 //给spinner2设置adapter spinner2.setAdapter(adapter); //parent指的是 spinner1 string1 = parent.getItemAtPosition(position).toString();// 获取当前显示省份 } public void onNothingSelected(AdapterView<?> parent) { // TODO Auto-generated method stub } }); spinner2.setOnItemSelectedListener(new OnItemSelectedListener() { public void onItemSelected(AdapterView<?> parent, View view, int position, long id) { //parent指的是 spinner2 String string2 = parent.getItemAtPosition(position).toString();// 获取当前显示省份 textView.setText(string1 +" : "+ string2); } public void onNothingSelected(AdapterView<?> parent) { // TODO Auto-generated method stub } }); } }
运行程序如下:
连通完成~
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