Android Spinner的五个部分

< LinearLayout
android:id="@+id/widget28"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical"
xmlns:android="http://schemas.android.com/apk/res/android" >

< TextView
android:id="@+id/TextView_Show"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="你选择的是"
android:textSize="25sp">
< /TextView>

< Spinner
android:id="@+id/spinner_City"
android:layout_width="fill_parent"
android:layout_height="wrap_content">
< /Spinner>
< !-- 定义一个下拉菜单-->

< /LinearLayout>

package eoe.spinner;

import java.util.ArrayList;
import java.util.List;
import android.app.Activity;
import android.os.Bundle;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnTouchListener;
import android.view.animation.Animation;
import android.view.animation.AnimationUtils;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Spinner;
import android.widget.TextView;

public class SpinnerTest1 extends Activity {
/** Called when the activity is first created. */

private List< String> list = new ArrayList< String>();

private TextView myTextView;
private Spinner mySpinner;
private ArrayAdapter< String> adapter;
private Animation myAnimation;

@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);

//第一步：添加一个下拉列表项的list，这里添加的项就是下拉列表的菜单项
list.add("北京");
list.add("上海");
list.add("深圳");
list.add("南京");
list.add("重庆");

myTextView = (TextView)findViewById(R.id.TextView_Show);
mySpinner = (Spinner)findViewById(R.id.spinner_City);

//第二步：为下拉列表定义一个适配器，这里就用到里前面定义的list。
adapter = new ArrayAdapter< String>(this,android.R.layout.simple_spinner_item, list);

//第三步：为适配器设置下拉列表下拉时的菜单样式。
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);

//第四步：将适配器添加到下拉列表上
mySpinner.setAdapter(adapter);

//第五步：为下拉列表设置各种事件的响应，这个事响应菜单被选中
mySpinner.setOnItemSelectedListener(new Spinner.OnItemSelectedListener(){

public void onItemSelected(AdapterView< ?> arg0, View arg1, int arg2, long arg3) {
// TODO Auto-generated method stub
/* 将所选mySpinner 的值带入myTextView 中*/
myTextView.setText("您选择的是："+ adapter.getItem(arg2));
/* 将mySpinner 显示*/
arg0.setVisibility(View.VISIBLE);
}

public void onNothingSelected(AdapterView< ?> arg0) {
// TODO Auto-generated method stub
myTextView.setText("NONE");
arg0.setVisibility(View.VISIBLE);
}
});

/*下拉菜单弹出的内容选项触屏事件处理*/
mySpinner.setOnTouchListener(new Spinner.OnTouchListener(){
public boolean onTouch(View v, MotionEvent event) {
// TODO Auto-generated method stub
/* 将mySpinner 隐藏，不隐藏也可以，看自己爱好*/
v.setVisibility(View.INVISIBLE);
return false;
}
});

/*下拉菜单弹出的内容选项焦点改变事件处理*/
mySpinner.setOnFocusChangeListener(new Spinner.OnFocusChangeListener(){
public void onFocusChange(View v, boolean hasFocus) {
// TODO Auto-generated method stub
v.setVisibility(View.VISIBLE);
}
});
}

 
}