public void executeSimpleAsyncTask(View view) {

    /*//在子线程中创建和执行AsyncTask
    new Thread(new Runnable() {
        @Override
        public void run() {
            mSimpleAsyncTask = new MySimpleAsyncTask();
            mSimpleAsyncTask.execute("task1");
        }
    }).start();*/
    mSimpleAsyncTask = new MySimpleAsyncTask();
    mSimpleAsyncTask.execute("task1");
  }
 public void cancelSimpleAsyncTask(View view) {
   if (mSimpleAsyncTask != null) {
     mSimpleAsyncTask.cancel(true);
   }
 }