Android實戰簡易教程-第二槍（Spinner下拉級聯效果）

標籤：android   spinner 級聯   

一、實現功能

廢話不多說，直接上代碼

strings.xml:

<?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 >江蘇省</item>    <item >山東省</item>    <item >浙江省</item></string-array></resources>

 

看一下布局檔案main.xml：

<?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代碼如下：

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", "蘇州市", "泰州市", "淮安市", },{ "濟南市", "威海市", "臨沂市", }, { "杭州市", "寧波市", "嘉興市", }, };private ArrayAdapter<CharSequence> adapter = null;public void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState); // 生命週期方法super.setContentView(R.layout.main); // 設定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]);//根據position確定第二個spinner中要填充的資料adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);//設定顯示樣式spinner2.setAdapter(adapter);}public void onNothingSelected(AdapterView<?> parent) {// TODO Auto-generated method stub}});}}

運行執行個體：

二、實現監聽

修改MainActivity.java代碼：

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", "蘇州市", "泰州市", "淮安市", },{ "濟南市", "威海市", "臨沂市", }, { "杭州市", "寧波市", "嘉興市", }, };private ArrayAdapter<CharSequence> adapter = null;String string1;String string2;public void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState); // 生命週期方法super.setContentView(R.layout.main); // 設定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]);// 根據position確定第二個spinner中要填充的資料adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);// 設定顯示樣式spinner2.setAdapter(adapter);string1 = parent.getItemAtPosition(position).toString();// 擷取當前顯示省份}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();// 擷取當前顯示省份textView.setText(string1 + string2);}public void onNothingSelected(AdapterView<?> parent) {// TODO Auto-generated method stub}});}}

運行執行個體如下：

 

總結

1.string1 = parent.getItemAtPosition(position).toString();// 擷取當前顯示省份

 

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Android實戰簡易教程-第二槍（Spinner下拉級聯效果）