android圖片拖動Gallery

1.Gallery可以拖動圖片，實現很炫的效果，如下，可以向左右拖動：

2.布局代碼

<?xml version="1.0" encoding="utf-8"?><Gallery xmlns:android="http://schemas.android.com/apk/res/android"    android:id="@+id/Gallery"    android:layout_width="fill_parent"    android:layout_height="wrap_content"></Gallery>

3.用一個類繼承自BaseAdapter來充當容器
 
public class ImageAdapter extends BaseAdapter {         private Context mContext; private Integer[] mImageIds = {               R.drawable.img1,               R.drawable.img2,               R.drawable.img3,               R.drawable.img4,               R.drawable.img5,               R.drawable.img6,               R.drawable.img7,               R.drawable.img8       };       public ImageAdapter(Context c){           this.mContext = c;       }       @Override      public int getCount() {           return mImageIds.length;//擷取圖片的個數   }         @Override      public Object getItem(int position) {           return position;//擷取圖片在庫中的位置   }         @Override      public long getItemId(int position) {           return position;//擷取圖片在庫中的位置   }         @Override      public View getView(int position, View convertView, ViewGroup parent) {           Log.i("TAG", position+"");           ImageView imageView = new ImageView(mContext);           imageView.setImageResource(mImageIds[position]);           imageView.setLayoutParams(new Gallery.LayoutParams(100,100));//設定圖片大小   imageView.setScaleType(ImageView.ScaleType.FIT_CENTER);//設定顯示比例類型   return imageView;       }     }
 
4.使用時的java代碼：public class Test_Gallery extends Activity {    /** Called when the activity is first created. */    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);        Gallery g = (Gallery) this.findViewById(R.id.Gallery);        g.setAdapter(new ImageAdapter(this));        g.setBackgroundResource(R.drawable.bg0);        g.setOnItemClickListener(new OnItemClickListener(){               @Override            public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,                    long arg3) {                Toast.makeText(Test_Gallery.this, "選擇了"+(arg2+1)+"號圖片", Toast.LENGTH_SHORT).show();            }           });    }}