Gallery 拖动效果

public class Activity01 extends Activity
{
	/** Called when the activity is first created. */
	@Override
	public void onCreate(Bundle savedInstanceState)
	{
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);

		//获得Gallery对象
		Gallery g = (Gallery) findViewById(R.id.Gallery01);

		//添加ImageAdapter给Gallery对象
		g.setAdapter(new ImageAdapter(this));

		//设置Gallery的背景
		g.setBackgroundResource(R.drawable.bg0);
		
		//设置Gallery的事件监听
		g.setOnItemClickListener(new OnItemClickListener() {
			public void onItemClick(AdapterView<?> parent, View v, int position, long id)
			{
		        Toast.makeText(Activity01.this,"你选择了"+(position+1)+" 号图片", 
		            Toast.LENGTH_SHORT).show();
			}
		});
	}
}

public class ImageAdapter extends BaseAdapter
{
	// 定义Context
	private Context		mContext;		
	// 定义整型数组 即图片源
	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,		
	};

	// 声明 ImageAdapter
	public ImageAdapter(Context c)
	{
		mContext = c;
	}

	// 获取图片的个数
	public int getCount()
	{
		return mImageIds.length;
	}

	// 获取图片在库中的位置
	public Object getItem(int position)
	{
		return position;
	}

	// 获取图片ID
	public long getItemId(int position)
	{
		return position;
	}

	public View getView(int position, View convertView, ViewGroup parent)
	{
		ImageView imageview = new ImageView(mContext);

		// 给ImageView设置资源
		imageview.setImageResource(mImageIds[position]);
		// 设置布局 图片120×120显示
		imageview.setLayoutParams(new Gallery.LayoutParams(120, 120));
		// 设置显示比例类型
		imageview.setScaleType(ImageView.ScaleType.FIT_CENTER);
		return imageview;
	}
}

评论

1 楼 silencetq 2011-09-13  

想请教，这种拖动的话，拖动的图片好像会有层黑色膜一样，这个是跟透明度有关么，我应该怎么解决呢？