总结Android中多线程更新应用的页面信息的方式

AsyncTask定义的三种泛型

• params: 启动任务执行的输入参数，如：http请求的URL
• progress:后台任务执行的百分比
• result:返回结果，如：String、list集合等

   private class MyTask extends AsyncTask<params, progress, result> { ... }
  

  示例代码：

    private class DownloadFilesTask extends AsyncTask<URL, Integer, Long> {
     protected Long doInBackground(URL... urls) {
       int count = urls.length;
       long totalSize = 0;
       for (int i = 0; i < count; i++) {
         totalSize += Downloader.downloadFile(urls[i]);
         publishProgress((int) ((i / (float) count) * 100));
         // Escape early if cancel() is called
         if (isCancelled()) break;
       }
       return totalSize;
     }
  
     protected void onProgressUpdate(Integer... progress) {
       setProgressPercent(progress[0]);
     }
  
     protected void onPostExecute(Long result) {
       showDialog("Downloaded " + result + " bytes");
     }
    }
  
  								 
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