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你们中的任何人在将片段添加到片段管理器后都没有遇到过片段吗？当我们试图隐藏它时，它会停留在屏幕上。

从 fragment:onActivityCreated 我们显示对话框：

@Override
public void onActivityCreated(Bundle savedInstanceState) 
{
    super.onActivityCreated(savedInstanceState);

    // Push the progress dialog
    String text = getActivity().getString(R.string.httpLoadingData);
    ((BaseFragmentActivity) getActivity()).showHttpWaitingDialog(text);

    ... 
}

稍后从新线程中的同一片段中我们隐藏对话框：

private void prepareInitialWebViewData() {
    initialFragmentWebDataLoadingThread = new Thread(new Runnable() {

        @Override
        public void run() {
            updateDataAndView();

            BaseFragmentActivity activity = (BaseFragmentActivity) getActivity();

                    BaseFragmentActivity activity = (BaseFragmentActivity) getActivity();
                    if (activity != null) 
                    {
                        activity.hideHttpWaitingDialog();
                    }

            // We don't need to keep this handle any longer since we've done
            // the work
            initialFragmentWebDataLoadingThread = null;
        }
    });

    initialFragmentWebDataLoadingThread.start();
}

这是在我们的 BaseFragmentActivity 中找到的用于显示和隐藏的代码。请注意，可能会多次调用 showdialog，因此我们保留一个 refcount。

首先是show函数：

public void showHttpWaitingDialog(CharSequence title)
{
    synchronized (mRefCount)
    {
        mRefCount++;

        Log.w("showhideHttpWaitingDialog", "++mRefCount:" + mRefCount + ", Title:" + title);

        FragmentManager fm = getSupportFragmentManager();
        if (fm != null)
        {
            Fragment frag = fm.findFragmentByTag("httpWaitDialog");

            if (frag == null)
            {
                WaitingOnHttpFragmentDialog dialog = WaitingOnHttpFragmentDialog.newInstance(title);

                fm.beginTransaction().add(dialog, "httpWaitDialog").commit();
            }
        }
        else
            Log.w("showhideHttpWaitingDialog", "fragman == null");
    }
}

然后隐藏功能：

public void hideHttpWaitingDialog()
{
    synchronized (mRefCount)
    {
        Log.w("showhideHttpWaitingDialog", "--mRefCount:" + mRefCount);

        if (mRefCount < 0)
        {
            Log.w("showhideHttpWaitingDialog", "Why are you trying to hide something that doesn't exists?");
            mRefCount = 0;
        }
        else
        {
            if (mRefCount == 0)
            {
                FragmentManager fragman = getSupportFragmentManager();
                if (fragman != null)
                {
                    Fragment frag = fragman.findFragmentByTag("httpWaitDialog");

                    if (frag != null)
                    {
                        fragman.beginTransaction().remove(frag).commit();
                        Log.w("showhideHttpWaitingDialog", "dismissed normally");
                    }
                    else
                        Log.w("showhideHttpWaitingDialog", "httpWaitDialog not found!");
                }
            }
        }
    }
}
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1 回答 1

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我可以告诉你你的问题是什么......你不能在除了 UI 线程之外的任何其他线程中更新 UI。

我不知道如何自己修复它，但快速搜索会发现以下可能有用的问题。

所以问题1

所以问题2

第二个似乎更接近于您当前的代码。

于 2012-05-03T15:06:21.527 回答