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


android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_alignParentTop="true"
android:layout_alignParentLeft="true"
/>


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"
/>

2.Java代码

package wjq.WidgetDemo;

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.BaseAdapter;
import android.widget.Gallery;
import android.widget.ImageSwitcher;
import android.widget.ImageView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.AdapterView.OnItemSelectedListener;
import android.widget.Gallery.LayoutParams;
import android.widget.ViewSwitcher.ViewFactory;

public class ImageSwitcherDemo extends Activity implements
OnItemSelectedListener, ViewFactory {
private ImageSwitcher is;
private Gallery gallery;

private Integer[] mThumbIds = { R.drawable.b, R.drawable.c,
R.drawable.d, R.drawable.f, R.drawable.g,
};

private Integer[] mImageIds = { R.drawable.b, R.drawable.c,
R.drawable.d, R.drawable.f, R.drawable.g, };

/*
* (non-Javadoc)
*
* @see android.app.Activity#onCreate(android.os.Bundle)
*/
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.imageswitcherpage);

is = (ImageSwitcher) findViewById(R.id.switcher);
is.setFactory(this);

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