多图片后台下载适配器（多线程后台下载图片）代码,Java代码库,德仔网

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【Java】多图片后台下载适配器（多线程后台下载图片）

作者:Dezai.CN / 发布于2013/6/17/ 750


	public class ImageListAdapter extends BaseAdapter {
	 private Context context;
	 private String[] myImages = null;
	 public ImageListAdapter (Context context, String[] myImages) {
	 this.context = context;
	 this.myImages = myImages;
	 }
	 @Override
	 public int getCount() {
	 if (myImages == null) {
	 return 0;
	 }
	 return myImages.length;
	 }
	 @Override
	 public String getItem (int position) {
	 if (position < 0 || myImages == null || position > myImages.length) {
	 return null;
	 }
	 return myImages[position];
	 }
	 @Override
	 public long getItemId (int position) {
	 return position;
	 }
	 @Override
	 public View getView (int position, View convertView, ViewGroup parent) {
	 View item = null;
	 if (convertView != null) {
	 item = convertView;
	 } else {
	 item = View.inflate (context, R.layout.image_item, null);
	 }
	 final ImageView imageView = (ImageView) item.findViewById (R.id.image);
	 final String image = getItem (position);
	 if (image == null) {
	 return item;
	 }
	 //对每个图片地址创建一个线程，
	 new Thread() {
	 public void run() {
	 Message msg = new Message();
	 msg.what = 0;
	 //getBitmap省略了，就是从网上通过http下载图片，转化成一个Bitmap
	 Bitmap bitmap = getBitmap (image);
	 List list = new ArrayList();
	 list.add (bitmap);
	 list.add (imageView);
	 msg.obj = list;
	 handler.sendMessage (msg);
	 }
	 } .start();
	 return item;
	 }
	 private Handler handler = new Handler() {
	 @Override
	 public void handleMessage (Message msg) {
	 switch (msg.what) {
	 case 0://接到从线程内传来的图片bitmap和imageView.
	 //这里只是将bitmap传到imageView中就行了。只所以不在线程中做是考虑到线程的安全性。
	 List list = (List) msg.obj;
	 Bitmap bitmap = (Bitmap) list.get (0);
	 ImageView iv = (ImageView) list.get (1);
	 iv.setImageBitmap (bitmap);
	 break;
	 default:
	 super.handleMessage (msg);
	 }
	 }
	 };
	}

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　下载适配器　

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