停止AsyncTask的片段中，当后退按钮pressed [英] Stop AsyncTask in Fragments when Back Button is pressed

问题描述

我有一个活动，该主机的片段。 pressing一个按钮，通过FragmentTransaction从碎片A去B片段和添加到后退堆栈。现在B片段具有从SD卡加载图像和图像加载它发布一个AsyncTask的实现。如果我preSS后退按钮，我的应用程序崩溃。 。错误报告表明，异步任务是问题，因为它仍然加载时后退按钮是pressed，所以我的问题是，我怎么能和我应该在哪里停止的AsyncTask时后退按钮已被pressed返回到previous片段/活动？..谢谢你。

i have an activities that host fragments. pressing a button goes from fragment A to fragment B through a FragmentTransaction and the added to the back stack. Now fragment B has an AsyncTask implementation which loads images from an sdcard and publishes it as an image is loaded. if i press the Back button, my app crashes. . The error report indicates that the async task is the problem as it was still loading when the Back button was pressed, so my question is, how can i or where should i stop the AsyncTask when the Back button has been pressed to return to the previous fragment/activity?.. Thank you.

推荐答案

覆盖您片段的onStop（）和做的：

Override the onStop() of your fragment and do:

protected void onStop() {
    super.onStop();

    //check the state of the task
    if(task != null && task.getStatus() == Status.RUNNING)
        task.cancel(true);
}

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