在刷新期间使用 SwipeRefreshLayout 切换片段时，片段冻结但实际上仍然有效

问题描述

更新:我认为它工作正常.但是经过一些测试问题仍然存在*嗅探*

然后我做了一个更简单的版本来看看到底发生了什么，我知道应该被分离的令人耳目一新的片段仍然留在那里.或者确切地说，旧片段的视图留在那里，在新片段之上.由于我原来的app的RecyclerView背景不是透明的，所以原来是我之前说的.

Then I made a simpler version to see what exactly happen and I get to know that the refreshing fragment which should have been detached still left there. Or exactly, the view of the old fragment left there, on top of the newer fragment. Since RecyclerView's background of my original app is not transparent, so It turned out what I said before.

更新结束

我有一个 MainActivity 布局如下:

I have a MainActivity with layout like this:

<android.support.v4.widget.DrawerLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools" android:id="@+id/drawer_layout"
android:layout_width="match_parent" android:layout_height="match_parent">

    <!-- As the main content view, the view below consumes the entire
         space available using match_parent in both dimensions. -->
    <FrameLayout android:id="@+id/container" android:layout_width="match_parent"
        android:layout_height="match_parent" />

    <!-- android:layout_gravity="start" tells DrawerLayout to treat
         this as a sliding drawer on the left side for left-to-right
         languages and on the right side for right-to-left languages.
         If you're not building against API 17 or higher, use
         android:layout_gravity="left" instead. -->
    <!-- The drawer is given a fixed width in dp and extends the full height of
         the container. -->
    <fragment android:id="@+id/navigation_drawer"
        android:layout_width="@dimen/navigation_drawer_width" android:layout_height="match_parent"
        android:layout_gravity="start" tools:layout="@layout/fragment_navigation_drawer" />

</android.support.v4.widget.DrawerLayout>

我用来填充@id/container的片段ContentView被配置为:

The fragment ContentView I use to fill @id/container is configured as:

<android.support.v4.widget.SwipeRefreshLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/contentView"
android:layout_width="match_parent"
android:layout_height="match_parent">

<android.support.v7.widget.RecyclerView
    android:id="@+id/tweet_list"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@color/grey_300"/>

</android.support.v4.widget.SwipeRefreshLayout>

这里是 ContentView

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    // Inflate the layout for this fragment
    View inflatedView = inflater.inflate(R.layout.fragment_content, container, false);

    mRecyclerView = (RecyclerView) inflatedView.findViewById(R.id.tweet_list);
    mRecyclerView.setHasFixedSize(false);

    mLinearLayoutManager = new LinearLayoutManager(getActivity().getApplicationContext());
    mRecyclerView.setLayoutManager(mLinearLayoutManager);

    mTweetList = new ArrayList<Tweet>;
    mAdapter = new TweetAdapter(mTweetList);
    mRecyclerView.setAdapter(mAdapter);
    mRecyclerView.setItemAnimator(new DefaultItemAnimator());

    mSwipeRefreshLayout = (SwipeRefreshLayout) inflatedView.findViewById(R.id.contentView);
    mSwipeRefreshLayout.setOnRefreshListener(
        ...
    );
    return inflatedView;
}

然后在MainActivity中我通过切换不同的ContentView来切换要显示的内容.除了一件事之外，一切看起来都不错:当我在导航抽屉刷新期间切换 ContentView 片段时，内容会冻结.但实际上一切都照常进行，只是你看不到它.

Then in MainActivity I switch the content to display by switching different ContentView. All looks good except one thing: when I switch ContentView fragments DURING refreshing by navigation drawer, then content freezes. But actually all things work as usual except you cannot see it.

推荐答案

嗯...经过一番挣扎，我最终自己解决了这个问题，方法很棘手...

Well... After some struggling I eventually solved this problem by myself, in a tricky way...

我只需要在 onPause() 中添加这些:

I just need to add these in onPause() :

@Override
public void onPause() {
    super.onPause();
    ...

    if (mSwipeRefreshLayout!=null) {
        mSwipeRefreshLayout.setRefreshing(false);
        mSwipeRefreshLayout.destroyDrawingCache();
        mSwipeRefreshLayout.clearAnimation();
    }
}

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