确定片段重新启动是由于屏幕旋转还是浏览页面滑动?

从…起 a comment of OP :

我的问题是我怎么知道的 onSaveInstanceState() 由于屏幕方向更改而不是片段重新启动而调用

你可以通过 Activity#isChangingConfigurations() 应用程序编程接口。

    @Override
    protected void onSaveInstanceState(Bundle outState) {
        super.onSaveInstanceState(outState);

        if (isChangingConfigurations()) {
            // this callback is executed as a result of a configuration change (e.g. orientation change)
        } else {
            // no configuration change happens (e.g. a click on a home button would end up here)
        }
    }

现在可以将布尔值保存到 Bundle outState 和相应的设置UI:

    @Override
    protected void onSaveInstanceState(Bundle outState) {
        super.onSaveInstanceState(outState);
        outState.putBoolean("isConfigurationChange", isChangingConfigurations());
    }

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        // initialization logics here

        if (savedInstanceState != null) {
            boolean isConfigurationChange = savedInstanceState.getBoolean("isConfigurationChange");

            // if `onCreate` is called as a result of configuration change
            if (isConfigurationChange) {
                // view hierarchy is not yet laid out, have to post an action 
                listView.post(new Runnable() {
                    @Override
                    public void run() {
                        // we are guaranteed, that `listView` is already laid out
                        listView.scrollToPosition(0);
                    }
                });
            }
        }
    }

注意,在内部执行布尔值检查逻辑 onResume() 是一个bug(按下主页按钮并导航回应用程序会导致再次滚动到顶部,这是不需要的)。相反 onCreate() 应选择为正确的回调。

我认为您可以声明一个变量,并在滑动操作时将状态检查为true。

viewPager.addOnPageChangeListener(new OnPageChangeListener() {
public void onPageScrollStateChanged(int state) {}
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {}

public void onPageSelected(int position) {
// here assign the variable to true;
// This method will get called only after a swipe action is invoked on 
//viewpager.  
 }});

在片段中检查变量 状态为true ,如果不是从方向生成,则重置 变量为false .

快乐编码:)

在片段和视图寻呼机中使用 onSaveInstanceState() 函数并使用保存的实例滚动到旧位置。

如果要保留的UI数据简单且轻量级,则可以 可以单独使用onSaveInstanceState()来保存状态数据。在里面 如果需要保留复杂数据,可以 使用ViewModel对象的组合,onSaveInstanceState() 方法和持久本地存储。

参考 Saving UI States

使用示例 onSaveInstanceState()

@Override
public void onCreate(@Nullable Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setHasOptionsMenu(true);
    if (savedInstanceState==null) {
            if(savedInstanceState.containsKey("position")){
                int positon = savedInstanceState.getInt("position",0);
                YOUR_RECYCLER_VIEW.scrollToPosition(positon);
        }
    }
}
@Override
public void onSaveInstanceState(@NonNull Bundle outState) {
    super.onSaveInstanceState(outState);
    outState.putInt("position",YOUR_RECYLER_VIEW.getVerticalScrollbarPosition());
}

在此处了解更多信息

1. How to use onSaveInstanceState() and onRestoreInstanceState()?

2. Android Developers Official Documention

要了解viewpage的页面更改,请使用

myViewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
        @Override
        public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {

        //Use your logic here.

        }

        @Override
        public void onPageSelected(int position) {

        //Use your logic here.

        }

        @Override
        public void onPageScrollStateChanged(int state) {

        //Use your logic here.

        }
    });

为什么要滚动到零位置?mListView。滚动位置(0);

我认为您可以在片段暂停时保存RecyclerView的当前位置,然后在重新创建后,转到该位置。