Android之圖文混排（三）接口的回調

調用loadImage（）方法，此方法內部獲取圖像數據，並將其引用傳給callBack.getDrawable()的形參，  通過此形參設置.......

回調類：

public class DownloadImage {

	private String image_path;
	
	public DownloadImage(String image_path) {
		// TODO Auto-generated constructor stub
		this.image_path = image_path;
	}
	public void loadImage(final ImageCallBack callBack)
	{
		final Handler handler = new Handler(){
			@Override
			public void handleMessage(Message msg) {
				// TODO Auto-generated method stub
				super.handleMessage(msg);
				
				callBack.getDrawable((Drawable)msg.obj);
			}
		};
		new Thread(new Runnable() {
			
			@Override
			public void run() {
				// TODO Auto-generated method stub
				try {
					Drawable drawable = Drawable.createFromStream(new URL(image_path).openStream(), "");
					Message message = Message.obtain();
					message.obj = drawable;
					handler.sendMessage(message);
					
					
				} catch (MalformedURLException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				} catch (IOException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
			}
		}).start();
	}
	//接口的回調方式
	public interface ImageCallBack
	{
		public void getDrawable(Drawable drawable);  
	}

}

獲取回調中的值：

DownloadImage downloadImage = new DownloadImage(CommonUri.PRODUCT_IMG + list.get(position).get("proimage").toString());
			downloadImage.loadImage(new DownloadImage.ImageCallBack() {
				
				@Override
				public void getDrawable(Drawable drawable) {
					// TODO Auto-generated method stub
					imageView.setImageDrawable(drawable);
				}
			});