如何将数据从异步任务传递到调用它的活动? [英] How to pass data from an asynchronous task to an activity that called it?

问题描述

我是Android新手.我在异步任务中使用套接字，并且希望将数据传递回调用它的活动.但是我不希望异步任务处理UI.我只想传递数据. e！[在此处输入图像描述] [1] xtends异步任务的类不是扩展活动的类的一部分

I am new to Android. I am using Sockets in an asynchronous task and I wish to pass data back to the activity that called it. But I do not want the asynchronous task to handle the UI. I just wish to pass data. The class that e![enter image description here][1]xtends async task is not a part of the class that extends activity

我的活动有2个按钮.单击该按钮时，将调用异步任务，并且应该对其余的活动进行相应的更改.

My activity has 2 buttons. When the button is clicked, async task is called and corresponding changes should be made to rest of the activity.

推荐答案

是的，您可以使用处理程序在AsyncTask和Activity之间进行通信，请参见以下示例，这将有所帮助，

Yes you can use handler to communicate between AsyncTask and Activity, see following example, it will help,

@Override
protected void onPostExecute(Object result) {
    super.onPostExecute(result);
        Message message = new Message();
        Bundle bundle = new Bundle();
        bundle.putString("file", pdfPath);
        message.setData(bundle);
        handler.sendMessage(message); // pass handler object from activity
}

将以下代码放入Activity类

put following code into Activity class

Handler handler = new android.os.Handler() {
    @Override
    public void handleMessage(Message msg) {
          String filePath = msg.getData().getString("file"); // You can change this according to your requirement.

    }
};

如果您不了解Handler类，请先阅读以下链接，它将为您提供帮助

If you dont't aware of Handler class then first read following link, it will help you

https://developer.android.com/training/multiple-线程/communicate-ui.html

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