android 加载网络数据（1）

使用异步任务加载网络图片：

class MyTask extends AsyncTask<String, Void, Bitmap>{

        @Override
        protected Bitmap doInBackground(String... params) { 
            HttpClient client = new DefaultHttpClient();
            HttpGet post = new HttpGet(params[0]);//注意请求方式，可能爆出请求方式不被允许
            try { 
                HttpResponse response = client.execute(post);
                int stateCode = response.getStatusLine().getStatusCode(); 
                if(stateCode == 200){
                    byte[] result = EntityUtils.toByteArray(response.getEntity());
                    Bitmap bm = BitmapFactory.decodeByteArray(result, 0, result.length);
                    return bm;
                }
            } catch (Exception e) {
                e.printStackTrace();
            }return null;
        }
        @Override
        protected void onPostExecute(Bitmap result) {
            super.onPostExecute(result); 
            if(result != null){ 
                iv.setImageBitmap(result);
            }
        }
        
    }

    @Override
        protected Bitmap doInBackground(String... params) {
            try {
                //创建URL对象
                 URL url = new URL(params[0]);
                 //获取连接
                 URLConnection conn = url.openConnection();
                 //设置连接超时, 一般为5s
                 conn.setConnectTimeout(5000);
                 //获取输入流
                 InputStream in  = conn.getInputStream();
                 Bitmap bm = BitmapFactory.decodeStream(in);
                 return bm;
            } catch (Exception e) {
                e.printStackTrace();
            }