Android实战简易教程<二>（Spinner下拉级联效果）

一、实现功能

废话不多说，直接上代码

strings.xml:

[html] view
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<?xml version="1.0" encoding="utf-8"?>

<resources>

<string name="hello">Hello World, Hello!</string>

<string name="app_name"></string>

<string-array name="province">

<item >江苏省</item>

<item >山东省</item>

<item >浙江省</item>

</string-array>

</resources>



看一下布局文件main.xml：

[html] view
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<?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="fill_parent"

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:id="@+id/text"

android:layout_width="match_parent"

android:layout_height="wrap_content" >

</TextView>



</LinearLayout>

MainActivity代码如下：

[java] view
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package org.yayun.demo;



import android.app.Activity;

import android.app.AlertDialog;

import android.app.Dialog;

import android.content.DialogInterface;

import android.os.Bundle;

import android.view.View;

import android.view.View.OnClickListener;

import android.view.View.OnFocusChangeListener;

import android.widget.AdapterView;

import android.widget.AdapterView.OnItemSelectedListener;

import android.widget.ArrayAdapter;

import android.widget.Button;

import android.widget.EditText;

import android.widget.Spinner;

import android.widget.TextView;



public class MainActivity extends Activity {

private Spinner spinner1;

private Spinner spinner2;

private TextView textView;

private String[][] dataStrings = { { "南京市", "徐州市", "苏州市", "泰州市", "淮安市", },

{ "济南市", "威海市", "临沂市", }, { "杭州市", "宁波市", "嘉兴市", }, };

private ArrayAdapter<CharSequence> adapter = null;



public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState); // 生命周期方法

super.setContentView(R.layout.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);//设置显示样式

spinner2.setAdapter(adapter);



}



public void onNothingSelected(AdapterView<?> parent) {

// TODO Auto-generated method stub



}

});



}

}

运行实例：

二、实现监听

修改MainActivity.java代码：

[java] view
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package org.yayun.demo;



import android.app.Activity;

import android.app.AlertDialog;

import android.app.Dialog;

import android.content.DialogInterface;

import android.os.Bundle;

import android.view.View;

import android.view.View.OnClickListener;

import android.view.View.OnFocusChangeListener;

import android.widget.AdapterView;

import android.widget.AdapterView.OnItemSelectedListener;

import android.widget.ArrayAdapter;

import android.widget.Button;

import android.widget.EditText;

import android.widget.Spinner;

import android.widget.TextView;



public class MainActivity extends Activity {

private Spinner spinner1;

private Spinner spinner2;

private TextView textView;

private String[][] dataStrings = { { "南京市", "徐州市", "苏州市", "泰州市", "淮安市", },

{ "济南市", "威海市", "临沂市", }, { "杭州市", "宁波市", "嘉兴市", }, };

private ArrayAdapter<CharSequence> adapter = null;

String string1;

String string2;



public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState); // 生命周期方法

super.setContentView(R.layout.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);// 设置显示样式

spinner2.setAdapter(adapter);

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) {

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



}

});



}

}

运行实例如下：

总结

1.string1 = parent.getItemAtPosition(position).toString();// 获取当前显示省份