Android[初级教程]第四篇 Spinner控件

还是接上一篇,这次妖精们说了,不要用RadioButton控件了,不好看,还占地方,抓一个人,要占四个地方,那我抓一个人只要占一个地方就行了,于是用了Spinner控件,还是一次抓一个

main.xml如下

<pre class="html" name="code"><?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></pre>

Activity的java代码如下:

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", "孙悟空 ", "猪八戒", "沙和尚" };

	/** Called when the activity is first created. */
	@Override
	public void onCreate(Bundle savedInstanceState)
	{
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);

		// 通过ID查找到main.xml中的TextView控件
		text = (TextView) findViewById(R.id.text);

		// 通过ID查找到main.xml中的Spinner控件
		spinner = (Spinner) findViewById(R.id.spinner);
		
		//设定一个Array适配器,将数组数据放入适配器中
		ArrayAdapter adapter = new ArrayAdapter(this,
				android.R.layout.simple_spinner_item, item);
		//设置下拉列表的样式
		adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
		
		//对Spinner进行适配
		spinner.setAdapter(adapter);
		
		//Spinner中事件选择的监听
		spinner.setOnItemSelectedListener(this);

	}

	private void updateText(String string)
	{
		// 将文本信息设置给TextView控件显示出来
		text.setText(string);
	}

	@Override
	public void onItemSelected(AdapterView<?> arg0, View arg1, int position,
			long arg3)
	{
		String str = "这次妖精把" + item[position] + "抓住了!";
		updateText(str);
		
	}

	@Override
	public void onNothingSelected(AdapterView<?> arg0)
	{
		// TODO Auto-generated method stub
		
	}

}

你要说妖精们的事还真多,一会这样,一会那样的,用我们现在的话来说就叫"众口难调"啊,毕竟妖精多了去了,