// 設(shè)置三種類型參數(shù)分別為String,Integer,String 
    class PageTask extends AsyncTask<String, Integer, String> { 

        // 可變長(zhǎng)的輸入?yún)?shù)，與AsyncTask.exucute()對(duì)應(yīng) 
        @Override 
        protected String doInBackground(String... params) { 
            try { 
                HttpClient client = new DefaultHttpClient(); 
                // params[0] 代表連接的url 
                HttpGet get = new HttpGet(params[0]); 
                HttpResponse response = client.execute(get); 
                HttpEntity entity = response.getEntity(); 
                long length = entity.getContentLength(); 
                InputStream is = entity.getContent(); 
                String s = null; 
                if (is != null) { 
                    ByteArrayOutputStream baos = new ByteArrayOutputStream(); 
                    byte[] buf = new byte[128]; 
                    int ch = -1; 
                    int count = 0; 
                    while ((ch = is.read(buf)) != -1) { 
                        baos.write(buf, 0, ch); 
                        count += ch; 
                        if (length > 0) { 
                            // 如果知道響應(yīng)的長(zhǎng)度，調(diào)用publishProgress（）更新進(jìn)度 
                            publishProgress((int) ((count / (float) length) * 100)); 
                        } 
                        // 為了在模擬器中清楚地看到進(jìn)度，讓線程休眠100ms 
                        Thread.sleep(100); 
                    } 
                    s = new String(baos.toByteArray());            } 
                // 返回結(jié)果 
                return s; 
            } catch (Exception e) { 
                e.printStackTrace(); 
            } 
            return null; 
        } 
        @Override 
        protected void onCancelled() { 
            super.onCancelled(); 
        } 
        @Override 
        protected void onPostExecute(String result) { 
            // 返回HTML頁(yè)面的內(nèi)容 
            message.setText(result); 
        } 
        @Override 
        protected void onPreExecute() { 
            // 任務(wù)啟動(dòng)，可以在這里顯示一個(gè)對(duì)話框，這里簡(jiǎn)單處理 
            message.setText(R.string.task_started); 
        } 
        @Override 
        protected void onProgressUpdate(Integer... values) { 
            // 更新進(jìn)度 
            message.setText(values[0]); 
        } 
    }

PageTask task = new PageTask(); 
task.execute(url.getText().toString());