listview点击item后跳转到详细页面后返回listview数据不显示问题

原因：

触发返回按钮后跳转到listview主界面，数据要重新加载，这时要想加载数据，就要在启动Activity的时候程序自动加载，而handler里面写的是主线程，一定会执行，所以在后面添加

 /**
   * 处理消息(主线程),更新适配器，如果在Thread里处理可能会出错
   * */
   handler = new Handler() {

    @Override
    public void handleMessage(Message msg) {
     switch (msg.what) {
     case Util.DOWNLOAD_START:
      progressDialog.show();
//      progressDialog.SetMessage(msg.getData().get("text")
//        .toString());
      Toast.makeText(CheckOrderActivity.this, Util.CurrentMessage,
        Toast.LENGTH_LONG).show(); 
      break;
     case Util.DOWNLOAD_END:
      progressDialog.dismiss();
      break;
     case Util.DOWNLOAD_OK:
      threadContinue=false;//结束线程
      Toast.makeText(CheckOrderActivity.this, Util.CurrentMessage,
        Toast.LENGTH_LONG).show(); 
      SetDatatoUI();
      progressDialog.dismiss();
      break;
     case Util.DOWNLOAD_ERROR:
      progressDialog.dismiss();
      Toast.makeText(CheckOrderActivity.this, "没有账单信息", Toast.LENGTH_LONG)
        .show();
      break;
     case Util.DOWNLOAD_DISCONNECT:
      progressDialog.dismiss();
      AlertDialog.Builder builder = new Builder(CheckOrderActivity.this);
      builder.setMessage("未连接上网络!");
      builder.setTitle("提示");
      builder.setPositiveButton("确认",
        new DialogInterface.OnClickListener() {
         @Override
         public void onClick(DialogInterface dialog,
           int which) {
          dialog.dismiss();
         }
        });
      builder.create().show();
      break;
     }
     super.handleMessage(msg);//执行父类的方法
    }
   };

adapter = new MyAdapterr(CheckOrderActivity.this, Fieldlist);
   search();//向服务请求数据
 }

即可成功解决。