图片切换ImageSwitcher&Gallery

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

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

    <Gallery
        android:id="@+id/gallery"
        android:background="#55000000"
        android:layout_width="match_parent"
        android:layout_height="60dp"
        android:layout_alignParentBottom="true"
        android:layout_alignParentLeft="true"
        android:gravity="center_vertical"
        android:spacing="16dp" />

</RelativeLayout>

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

public class MainActivity extends Activity implements OnItemSelectedListener,ViewFactory{
	//声明ImageSwitcher、Gallery
	private ImageSwitcher  is = null;
	private Gallery gallery = null;
	//定义缩微图，图片已经复制到drawable-hdpi文件夹了
	private Integer[] mThumbIds = {
		R.drawable.a,
		R.drawable.b,
		R.drawable.c,
		R.drawable.d,
		R.drawable.e
	};
	//定义图
	private Integer[] mImageIds = {
			R.drawable.a,
			R.drawable.b,
			R.drawable.c,
			R.drawable.d,
			R.drawable.e
	};
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		requestWindowFeature(Window.FEATURE_NO_TITLE);
		setContentView(R.layout.activity_main);
		
		is = (ImageSwitcher) findViewById(R.id.switcher);
		is.setFactory(this);
		//显示效果
		is.setInAnimation(AnimationUtils.loadAnimation(this, android.R.anim.fade_in));
		is.setOutAnimation(AnimationUtils.loadAnimation(this, android.R.anim.fade_out));
		
		gallery = (Gallery) findViewById(R.id.gallery);
		gallery.setAdapter(new ImageAdapter(this));//类中要写构造参数
		//设置OnItemSelected监听事件
		gallery.setOnItemSelectedListener(this);
	}
	
	public class ImageAdapter extends BaseAdapter{
		private Context mContext;
		public ImageAdapter(Context c) {
			// TODO 自动生成的构造函数存根
			mContext = c;
		}

		@Override
		public int getCount() {
			// TODO 自动生成的方法存根
			return mThumbIds.length;
		}

		@Override
		public Object getItem(int position) {
			return position;
		}

		@Override
		public long getItemId(int position) {
			return position;
		}

		@Override
		public View getView(int position, View convertView, ViewGroup parent) {
			ImageView i = new ImageView(mContext);
			i.setImageResource(mThumbIds[position]);
			i.setAdjustViewBounds(true);
			i.setLayoutParams(new Gallery.LayoutParams(LayoutParams.WRAP_CONTENT,LayoutParams.WRAP_CONTENT));
			i.setBackgroundResource(R.drawable.e);
			return i;
		}
		
	}

	@Override
	public void onItemSelected(AdapterView<?> parent, View view, int position,
			long id) {
		is.setImageResource(mImageIds[position]);
	}

	@Override
	public void onNothingSelected(AdapterView<?> arg0) {
		// TODO 自动生成的方法存根
		
	}

	@Override
	public View makeView() {
		ImageView i = new ImageView(this);
		i.setBackgroundColor(0xFF000000);
		i.setScaleType(ImageView.ScaleType.FIT_CENTER);
		i.setLayoutParams(new ImageSwitcher.LayoutParams(LayoutParams.MATCH_PARENT,LayoutParams.MATCH_PARENT));
		return i;
	}

}