【Android(安卓)Demo】图片之画廊效果(Gallery Switcher)

1.介绍
通过Gallery和ImageSwitcher结合的结果，上面的是ImageSwitcher，下面的是Gallery，通过滑动Gallery内的图片或单击图片，即可带动ImageSwitcher图片的跳转！

2.效果图

3.XML文件

<?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">    <ImageSwitcher android:id="@+id/imageSwitcher"        android:layout_width="wrap_content" android:layout_height="wrap_content"        android:layout_centerInParent="true" />    <Gallery android:id="@+id/gallery" android:background="#55000000"        android:layout_width="fill_parent" android:layout_height="wrap_content"        android:layout_alignParentBottom="true" android:spacing="10dp" /></RelativeLayout>

4.Java代码

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.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 Hualang extends Activity {    // 显示图片的资源    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;    ImageSwitcher is;    @Override    protected void onCreate(Bundle savedInstanceState) {        // TODO Auto-generated method stub        super.onCreate(savedInstanceState);        setContentView(R.layout.hualang);        setTitle("这是Gallery和ImageSwitcher的效果");        gallery = (Gallery) findViewById(R.id.gallery);        is = (ImageSwitcher) findViewById(R.id.imageSwitcher);        gallery.setAdapter(new ImageAdapter(this));        // 让选定的图片在中心显示        gallery.setSelection(images.length / 2);        // 为Gallery绑定监听器；        gallery.setOnItemSelectedListener(new OnItemSelectedListener() {            public void onItemSelected(AdapterView<?> parent, View view,                    int position, long id) {                // 当在Gallery中选定一张图片是 ImageSwitcher同步显示同一张                // position%images.length 为了让图片循环显示                is.setImageResource(images[position % images.length]);            }            public void onNothingSelected(AdapterView<?> parent) {            }        });        is.setFactory(new ImageFactory(this));    }    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);            iv.setImageResource(images[position % images.length]);            iv.setLayoutParams(new Gallery.LayoutParams(90, 90));            iv.setAdjustViewBounds(true);            return iv;        }    }    private class ImageFactory implements ViewFactory {        private Context context;        public ImageFactory(Context context) {            this.context = context;        }        public View makeView() {            ImageView iv = new ImageView(context);            iv.setLayoutParams(new ImageSwitcher.LayoutParams(200, 200));            return iv;        }    }}

PS:图片是读取drawable文件里的，不是SD卡里的

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