【Android Demo】图片之滑动效果(Gallery)

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="match_parent">
    <Gallery android:layout_width="fill_parent" android:id="@+id/gallery1"
        android:layout_height="fill_parent" android:spacing="16dp"></Gallery>
</RelativeLayout>

 package wei.ye.g1;

import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup;
import android.view.ViewGroup.LayoutParams;
import android.widget.BaseAdapter;
import android.widget.Gallery;
import android.widget.ImageView;

public class Huadong extends Activity {
    private static int[] images = { R.drawable.baos, R.drawable.caoc,
            R.drawable.chenyj, R.drawable.chenyy, R.drawable.gouj,
            R.drawable.guany, R.drawable.hanx, R.drawable.lp, R.drawable.liub,
            R.drawable.qinq, R.drawable.tiemz, R.drawable.wus,
            R.drawable.xiangy, R.drawable.yuef, R.drawable.zhaoky,
            R.drawable.zhugl, R.drawable.xis, R.drawable.yingz };
    Gallery gallery;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        setContentView(R.layout.huadong);
        setTitle("只用了Gallery的效果");
        gallery = (Gallery) findViewById(R.id.gallery1);
        gallery.setAdapter(new ImageAdapter(this));
        gallery.setSelection(images.length / 2);
    }

    private class ImageAdapter extends BaseAdapter {
        private Context context;

        public ImageAdapter(Context context) {
            this.context = context;
        }

        // 可以return images.lenght(),在这里返回Integer.MAX_VALUE
        // 是为了使图片循环显示
        public int getCount() {
            return Integer.MAX_VALUE;
        }

        public Object getItem(int position) {
            return null;
        }

        public long getItemId(int position) {
            return 0;
        }

        public View getView(int position, View convertView, ViewGroup parent) {
            ImageView iv = new ImageView(context);
            //设置具体要显示的图片
            iv.setImageResource(images[position % images.length]);
            //设置ImageView的高度和宽度
            iv.setLayoutParams(new Gallery.LayoutParams(
                    LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT));
            iv.setAdjustViewBounds(true);
            return iv;
        }
    }
}