android平台UniversalImageLoader(异步加载大量图片

摘要:第四种ImageGallery效果如图： 测试关键代码： public class ImageGalleryActivity extends BaseActivity{private Gallery gallery;private DisplayImageOptions options;public void onCreate(Bundle savedInstanc




第四种ImageGallery效果如图：



测试关键代码：

public class ImageGalleryActivity extends BaseActivity
{

	private Gallery gallery;

	private DisplayImageOptions options;

	public void onCreate(Bundle savedInstanceState)
	{
		super.onCreate(savedInstanceState);

		setContentView(R.layout.ac_image_gallery);
		Bundle bundle = getIntent().getExtras();
		String[] imageUrls = bundle.getStringArray(Extra.IMAGES);
		int galleryPosition = bundle.getInt(Extra.IMAGE_POSITION, 0);

		options = new DisplayImageOptions.Builder()
				.showImageForEmptyUri(R.drawable.image_for_empty_url)
				.showStubImage(R.drawable.stub_image).cacheInMemory()
				.cacheOnDisc().build();

		gallery = (Gallery) findViewById(R.id.gallery);
		gallery.setAdapter(new ImagePagerAdapter(imageUrls));
		gallery.setSelection(galleryPosition);
	}

	@Override
	protected void onStop()
	{
		imageLoader.stop();
		super.onStop();
	}

	private class ImagePagerAdapter extends BaseAdapter
	{

		private String[] images;
		private LayoutInflater inflater;

		ImagePagerAdapter(String[] images)
		{
			this.images = images;
			inflater = getLayoutInflater();
		}

		@Override
		public int getCount()
		{
			return images.length;
		}

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

		@Override
		public long getItemId(int position)
		{
			return position;
		}

		@Override
		public View getView(int position, View convertView, ViewGroup parent)
		{
			ImageView imageView = (ImageView) convertView;
			if (imageView == null)
			{
				imageView = (ImageView) inflater.inflate(
						R.layout.item_gallery_image, parent, false);
			}
			imageLoader.displayImage(images[position], imageView, options);
			return imageView;
		}
	}
}

实例中通过imageLoader成员负责图片操作！初始化如下：

protected ImageLoader imageLoader = ImageLoader.getInstance();
此处主要是围绕UniversalImageLoader使用的介绍