Android[初級教程]第四篇 Spinner控制項

還是接上一篇,這次妖精們說了,不要用RadioButton控制項了,不好看,還佔地方,抓一個人,要佔四個地方,那我抓一個人只要佔一個地方就行了,於是用了Spinner控制項,還是一次抓一個

main.xml如下

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"android:orientation="vertical" android:layout_width="fill_parent"android:layout_height="fill_parent"><Spinner android:layout_height="wrap_content" android:id="@+id/spinner"android:layout_width="wrap_content"></Spinner><TextView android:layout_height="wrap_content"android:layout_width="fill_parent" android:text="@string/hello"android:id="@+id/text"></TextView></LinearLayout>

Activity的java代碼如下:

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 ButtonDemoActivity extends Activity implements OnItemSelectedListener{private TextView text = null;private Spinner spinner;private String[] item = { "唐僧", "孫悟空 ", "豬八戒", "沙和尚" };/** Called when the activity is first created. */@Overridepublic void onCreate(Bundle savedInstanceState){super.onCreate(savedInstanceState);setContentView(R.layout.main);// 通過ID尋找到main.xml中的TextView控制項text = (TextView) findViewById(R.id.text);// 通過ID尋找到main.xml中的Spinner控制項spinner = (Spinner) findViewById(R.id.spinner);//設定一個Array適配器,將數組資料放入適配器中ArrayAdapter adapter = new ArrayAdapter(this,android.R.layout.simple_spinner_item, item);//設定下拉式清單的樣式adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);//對Spinner進行適配spinner.setAdapter(adapter);//Spinner中事件選擇的監聽spinner.setOnItemSelectedListener(this);}private void updateText(String string){// 將文本資訊設定給TextView控制項顯示出來text.setText(string);}@Overridepublic void onItemSelected(AdapterView<?> arg0, View arg1, int position,long arg3){String str = "這次妖精把" + item[position] + "抓住了!";updateText(str);}@Overridepublic void onNothingSelected(AdapterView<?> arg0){// TODO Auto-generated method stub}}

你要說妖精們的事還真多,一會這樣,一會那樣的,用我們現在的話來說就叫"眾口難調"啊,畢竟妖精多了去了,