Gallery控件的使用
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*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(); } });