Gallery控件的运用

一、Gallery的拖动图片特效

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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)));}}

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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();}});

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