android 入门 ImageSwitcher

package com.isoftstone.cry;

import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup;
import android.view.animation.AnimationUtils;
import android.widget.AdapterView;
import android.widget.BaseAdapter;
import android.widget.Gallery;
import android.widget.Gallery.LayoutParams;
import android.widget.ImageSwitcher;
import android.widget.ImageView;
import android.widget.AdapterView.OnItemSelectedListener;
import android.widget.ImageView.ScaleType;
import android.widget.ViewSwitcher.ViewFactory;

public class GallerySwitcherActivity extends Activity implements OnItemSelectedListener , ViewFactory
{
	private ImageSwitcher mswitcher ;
	private Integer[] mThumbIds ={
			R.drawable.fc,
			R.drawable.ic_launcher,
			R.drawable.ic_menu_add,
			R.drawable.ic_menu_edit,
			R.drawable.ic_menu_help,
			R.drawable.psu
	};
	private Integer[] mImageIds ={
			R.drawable.fc,
			R.drawable.ic_launcher,
			R.drawable.ic_menu_add,
			R.drawable.ic_menu_edit,
			R.drawable.ic_menu_help,
			R.drawable.psu
	};
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		// TODO Auto-generated method stub
		super.onCreate(savedInstanceState);
		setContentView(R.layout.gallery_imageswitcher);
		mswitcher = (ImageSwitcher)findViewById(R.id.imageSwitcher1);
		mswitcher.setFactory(this);
		mswitcher.setAnimation(AnimationUtils.loadAnimation(this,android.R.anim.fade_out));
		mswitcher.setAnimation(AnimationUtils.loadAnimation(this,android.R.anim.fade_in));
		
		Gallery gallery = (Gallery)findViewById(R.id.gallery1);
		gallery.setAdapter(new ImageAdapter(this));
		gallery.setOnItemSelectedListener(this);
	}
	//gallery adapter
	public class ImageAdapter extends BaseAdapter
	{
		 Context context ;
		public ImageAdapter(Context c) {
			// TODO Auto-generated constructor stub
			context = c ;
		}
		@Override
		public int getCount() {
			// TODO Auto-generated method stub
			return mThumbIds.length;
		}
		@Override
		public Object getItem(int position) {
			// TODO Auto-generated method stub
			return position;
		}
		@Override
		public long getItemId(int position) {
			// TODO Auto-generated method stub
			return position;
		}
		@Override
		public View getView(int position, View convertView, ViewGroup parent) {
			// TODO Auto-generated method stub
			ImageView iv = new ImageView(context);
			iv.setImageResource(mThumbIds[position]);
			iv.setAdjustViewBounds(true);
			iv.setLayoutParams(new Gallery.LayoutParams(LayoutParams.WRAP_CONTENT,LayoutParams.WRAP_CONTENT));
			iv.setBackgroundResource(R.drawable.fc);
			return iv;
		}
	}
	@Override
	public void onItemSelected(AdapterView<?> adapter, View v, int position,
			long id) {
		// TODO Auto-generated method stub
		mswitcher.setImageResource(mImageIds[position]);
	}
	@Override
	public View makeView() {
		// TODO Auto-generated method stub
		ImageView i = new ImageView(this);
		i.setBackgroundColor(0xff000000);
		i.setScaleType(ImageView.ScaleType.FIT_CENTER);
		i.setLayoutParams(new ImageSwitcher.LayoutParams(LayoutParams.FILL_PARENT,LayoutParams.FILL_PARENT));
		
		return i;
	}
	
	@Override
	public void onNothingSelected(AdapterView<?> arg0) {
		// TODO Auto-generated method stub
		
	}
}

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent" >

    <Gallery
        android:id="@+id/gallery1"
        android:layout_width="fill_parent"
        android:layout_height="60dp"
        android:gravity="center_vertical"
        android:spacing="16dp"
        android:layout_alignParentBottom="true"
        android:layout_alignParentLeft="true" />

    <ImageSwitcher
        android:id="@+id/imageSwitcher1"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true">
    </ImageSwitcher>

</RelativeLayout>