Android -- ImageSwitch和Gallery 混合使用

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

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

</RelativeLayout>

public class MainActivity extends Activity implements OnItemSelectedListener,
        ViewFactory {

    /**
     * ImageSwitcher 控件
     */
    private ImageSwitcher is_switcher;

    /**
     * Gallery 控件
     */
    private Gallery galley;

    /**
     * 小图使用的数组
     */
    private Integer[] mThumbIds = { R.drawable.pic, R.drawable.pic2,
            R.drawable.pic3, R.drawable.pic4, R.drawable.pic5 };

    /**
     * 大图使用的数组
     */
    private Integer[] mImageIds = { R.drawable.ic_launcher,
            R.drawable.pic2, R.drawable.ic_launcher,
            R.drawable.pic2, R.drawable.ic_launcher };

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        
        /**
         * 使用无标题的样式
         */
        requestWindowFeature(Window.FEATURE_NO_TITLE);

        /**
         * 设置显示的布局文件
         */
        setContentView(R.layout.activity_main);

        /**
         * 实例化   ImageSwitcher 控件并与之关联
         */
        is_switcher = (ImageSwitcher) findViewById(R.id.is_switcher);
        
        /**
         * 指代下面的makeView 因为实现了ViewFactory 接口
         */
        is_switcher.setFactory(this);

        // 设置进入动画和出去动画  使用系统默认的样式
        is_switcher.setInAnimation(AnimationUtils.loadAnimation(this,
                android.R.anim.fade_in));
        is_switcher.setOutAnimation(AnimationUtils.loadAnimation(this,
                android.R.anim.fade_out));

        /**
         * 实例化一个Gallery控件并与之绑定
         */
        galley = (Gallery) findViewById(R.id.gallery);
        
        // 为Gallery 对象设置适配器
        galley.setAdapter(new ImageAdapter(this));

        /**
         * 设置当Gallery对象选项被选择时的监听事件
         */
        galley.setOnItemSelectedListener(this);

    }

    @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;
    }

    public class ImageAdapter extends BaseAdapter {
        public ImageAdapter(Context c) {
            mContext = c;
        }

        public int getCount() {
            return mThumbIds.length;
        }

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

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

        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.ic_launcher);
            return i;
        }

        private Context mContext;
    }

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

    @Override
    public void onNothingSelected(AdapterView<?> parent) {
    }

}