android 如何从网络获取一张图片

1.创建异步类

private class downLoadAction extends AsyncTask<String, Void, Bitmap> {

		@Override
		protected Bitmap doInBackground(String... arg0) {
			// TODO Auto-generated method stub
			Bitmap bitmap = null;
			try {
				bitmap = HttpUtils.getBitMap(arg0[0]);
			} catch (Exception e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}

			return bitmap;
		}

		@Override
		protected void onPostExecute(Bitmap bitmap) {
			// TODO Auto-generated method stub
			super.onPostExecute(bitmap);
			imageView.setImageBitmap(bitmap);
		}
	}private class downLoadAction exten