删除OnBackPressedCallback片段管理器

Question

我有一个活动，它从Internet加载数据，并且工作正常，除了o必须双击后退按钮才能完成它。我还注意到，在那些不连接到互联网的活动中，后退按钮从第一次单击起就起作用。当调试它时，我发现片段管理器回调正在处理，首先单击

        FragmentManager.this.handleOnBackPressed();

来源

void handleOnBackPressed() {
    // First, execute any pending actions to make sure we're in an
    // up to date view of the world just in case anyone is queuing
    // up transactions that change the back stack then immediately
    // calling onBackPressed()
    execPendingActions();
    if (mOnBackPressedCallback.isEnabled()) {
        // We still have a back stack, so we can pop
        popBackStackImmediate();
    } else {
        // Sigh. Due to FragmentManager's asynchronicity, we can
        // get into cases where we *think* we can handle the back
        // button but because of frame perfect dispatch, we fell
        // on our face. Since our callback is disabled, we can
        // re-trigger the onBackPressed() to dispatch to the next
        // enabled callback
        mOnBackPressedDispatcher.onBackPressed();
    }
}

尽管我不使用片段

Answer 1

我可以为您的问题提供临时解决方案，因为很难确切地了解是什么原因造成的。要解决此问题，您可以在“活动”中覆盖onBackPressed()并在那里完成。

@Override
public void onBackPressed()
{
     finish();
}