Gallery控件的运用

一、Gallery的拖动图片特效

 

public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.koo);
		
		Gallery gallery = (Gallery)findViewById(R.id.gallery1);gallery.setAdapter(new ImageAdapter(this));
	}
	
	public class ImageAdapter extends BaseAdapter { /* 类成员 myContext为Context父类 */
		private Context myContext; /* 使用android.R.drawable里的图片作为图库来源，类型为整数数组 */
		private int[] myImageIds = { 
				R.drawable.img1,
				R.drawable.img2,
				R.drawable.img3,
				R.drawable.img4,
				R.drawable.img5}; /* 建构子只有一个参数，即要储存的Context */

		public ImageAdapter(Context c) {
			this.myContext = c;
		} /* 回传所有已定义的图片总数量 */

		public int getCount() {
			return this.myImageIds.length;
		} /* 利用getItem方法，取得目前容器中影像的数组ID */

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

		public long getItemId(int position) {
			return position;
		} /* 取得目前欲显示的影像View，传入数组ID值使之读取与成像 */

		public View getView(int position, View convertView, ViewGroup parent) { /* 建立一个ImageView对象 */
			ImageView i = new ImageView(this.myContext);
			i.setImageResource(this.myImageIds[position]);
			i.setScaleType(ImageView.ScaleType.FIT_XY); /*
														 * 设定这个ImageView对象的宽高，单位为dip
														 */
			i.setLayoutParams(new Gallery.LayoutParams(80, 80));
			return i;
		} /* 依据距离中央的位移量 利用getScale回传views的大小(0.0f to 1.0f) */

		public float getScale(boolean focused, int offset) { /*
															 * Formula: 1 / (2 ^
															 * offset)
															 */
			return Math.max(0, 1.0f / (float) Math.pow(2, Math.abs(offset)));
		}
	}

 

 

galley.setOnItemClickListener(new OnItemClickListener() {
			public void onItemClick(AdapterView parent, View v, int position,
					long id) {
				Toast.makeText(
						EX04_10.this, "第" + position + "张",
						Toast.LENGTH_SHORT).show();
			}
		});