android 同步滚动多个RecyclerView

uelo1irk  于 2023-02-14  发布在  Android
关注(0)|答案(9)|浏览(199)

我有一个ViewPager,每页显示一个片段。此片段包含RecyclerView中的项目列表。项目列表始终具有相同的大小,项目的视图也具有相同的高度。当滚动其中一个RecyclerView时,我希望其他RecyclerView同时滚动相同的距离。如何同步RecyclerView的滚动?

dgenwo3n

dgenwo3n1#

这是我的解决方案。代码越少越好...
lvDetail和lvDetail2是您要保持同步的循环视图。

final RecyclerView.OnScrollListener[] scrollListeners = new RecyclerView.OnScrollListener[2];
    scrollListeners[0] = new RecyclerView.OnScrollListener( )
    {
        @Override
        public void onScrolled(RecyclerView recyclerView, int dx, int dy)
        {
            super.onScrolled(recyclerView, dx, dy);
            lvDetail2.removeOnScrollListener(scrollListeners[1]);
            lvDetail2.scrollBy(dx, dy);
            lvDetail2.addOnScrollListener(scrollListeners[1]);
        }
    };
    scrollListeners[1] = new RecyclerView.OnScrollListener( )
    {
        @Override
        public void onScrolled(RecyclerView recyclerView, int dx, int dy)
        {
            super.onScrolled(recyclerView, dx, dy);
            lvDetail.removeOnScrollListener(scrollListeners[0]);
            lvDetail.scrollBy(dx, dy);
            lvDetail.addOnScrollListener(scrollListeners[0]);
        }
    };
    lvDetail.addOnScrollListener(scrollListeners[0]);
    lvDetail2.addOnScrollListener(scrollListeners[1]);
uqjltbpv

uqjltbpv2#

我相信理解它的工作原理对您是有意义的,所以我将解释我设计解决方案时遵循的整个过程。注意,这个示例只针对两个RecyclerViews,但是使用更多的RecyclerViews就像使用一个RecyclerViews数组一样简单。
首先想到的是监听两个ScrollView上的滚动变化,当其中一个滚动时,在另一个上使用scrollBy(int x,int y)。不幸的是,编程式滚动也会触发监听器,因此最终会陷入循环。
为了克服这个问题,你需要设置一个OnItemTouchListener,当你点击RecyclerView时添加正确的ScrollListener,当滚动停止时删除它。这几乎可以完美地工作,但是如果你在一个长的RecyclerView中执行一个快速的扫视,然后在它完成之前再次滚动它,只有第一个滚动会被传输。
要解决此问题,您需要确保仅在RecyclerView空闲时添加OnScrollListener。
我们来看看来源:

public class SelfRemovingOnScrollListener extends RecyclerView.OnScrollListener {

    @Override
    public final void onScrollStateChanged(@NonNull final RecyclerView recyclerView, final int newState) {
        super.onScrollStateChanged(recyclerView, newState);
        if (newState == RecyclerView.SCROLL_STATE_IDLE) {
            recyclerView.removeOnScrollListener(this);
        }
    }
}

这是你需要扩展OnScrollListeners的类,这样可以确保在需要时删除它们。
然后我有两个侦听器,每个侦听器对应一个RecyclerView:

private final RecyclerView.OnScrollListener mLeftOSL = new SelfRemovingOnScrollListener() {
    @Override
    public void onScrolled(@NonNull final RecyclerView recyclerView, final int dx, final int dy) {
        super.onScrolled(recyclerView, dx, dy);
        mRightRecyclerView.scrollBy(dx, dy);
    }
}, mRightOSL = new SelfRemovingOnScrollListener() {

    @Override
    public void onScrolled(@NonNull final RecyclerView recyclerView, final int dx, final int dy) {
        super.onScrolled(recyclerView, dx, dy);
        mLeftRecyclerView.scrollBy(dx, dy);
    }
};

然后在初始化时你可以设置OnItemTouchListeners。最好是为整个视图设置一个监听器,但是RecyclerView不支持这个。OnItemTouchListeners不会造成任何问题:

mLeftRecyclerView.addOnItemTouchListener(new RecyclerView.OnItemTouchListener() {

        private int mLastY;

        @Override
        public boolean onInterceptTouchEvent(@NonNull final RecyclerView rv, @NonNull final
        MotionEvent e) {
            Log.d("debug", "LEFT: onInterceptTouchEvent");

            final Boolean ret = rv.getScrollState() != RecyclerView.SCROLL_STATE_IDLE;
            if (!ret) {
                onTouchEvent(rv, e);
            }
            return Boolean.FALSE;
        }

        @Override
        public void onTouchEvent(@NonNull final RecyclerView rv, @NonNull final MotionEvent e) {
            Log.d("debug", "LEFT: onTouchEvent");

            final int action;
            if ((action = e.getAction()) == MotionEvent.ACTION_DOWN && mRightRecyclerView
                    .getScrollState() == RecyclerView.SCROLL_STATE_IDLE) {
                mLastY = rv.getScrollY();
                rv.addOnScrollListener(mLeftOSL);
            }
            else {
                if (action == MotionEvent.ACTION_UP && rv.getScrollY() == mLastY) {
                    rv.removeOnScrollListener(mLeftOSL);
                }
            }
        }

        @Override
        public void onRequestDisallowInterceptTouchEvent(final boolean disallowIntercept) {
            Log.d("debug", "LEFT: onRequestDisallowInterceptTouchEvent");
        }
    });

    mRightRecyclerView.addOnItemTouchListener(new RecyclerView.OnItemTouchListener() {

        private int mLastY;

        @Override
        public boolean onInterceptTouchEvent(@NonNull final RecyclerView rv, @NonNull final
        MotionEvent e) {
            Log.d("debug", "RIGHT: onInterceptTouchEvent");

            final Boolean ret = rv.getScrollState() != RecyclerView.SCROLL_STATE_IDLE;
            if (!ret) {
                onTouchEvent(rv, e);
            }
            return Boolean.FALSE;
        }

        @Override
        public void onTouchEvent(@NonNull final RecyclerView rv, @NonNull final MotionEvent e) {
            Log.d("debug", "RIGHT: onTouchEvent");

            final int action;
            if ((action = e.getAction()) == MotionEvent.ACTION_DOWN && mLeftRecyclerView
                    .getScrollState
                            () == RecyclerView.SCROLL_STATE_IDLE) {
                mLastY = rv.getScrollY();
                rv.addOnScrollListener(mRightOSL);
            }
            else {
                if (action == MotionEvent.ACTION_UP && rv.getScrollY() == mLastY) {
                    rv.removeOnScrollListener(mRightOSL);
                }
            }
        }

        @Override
        public void onRequestDisallowInterceptTouchEvent(final boolean disallowIntercept) {
            Log.d("debug", "RIGHT: onRequestDisallowInterceptTouchEvent");
        }
    });
}

还要注意,在我的特定情况下,RecyclerViews不是第一个接收到touch事件的视图,因此我需要拦截它。如果不是您的情况,您可以(应该)将onInterceptTouchEvent(...)中的代码合并到onTouchEvent(...)中。
最后,如果用户试图同时滚动两个RecyclerViews,这将导致崩溃。这里最好的解决方案是在包含RecyclerViews的直接父对象中设置android:splitMotionEvents="false"
您可以看到代码here的示例。

r6l8ljro

r6l8ljro3#

我想我已经找到了一个简单明了的答案。
正如Jorge Antonio Díaz-Benito所说:"首先想到的是监听两个ScrollView上的滚动变化,当其中一个滚动时,在另一个上使用scrollBy(int x,int y)。不幸的是,通过编程滚动也会触发监听器,所以最终会陷入循环。"
所以你需要解决这个问题。如果你只是跟踪谁在滚动,他们就不会循环。

    • 解决方案**
public class SelfScrolListener extends RecyclerView.OnScrollListener {
    @Override
    public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
        super.onScrollStateChanged(recyclerView, newState);
        if (newState == RecyclerView.SCROLL_STATE_IDLE) {
            viewIsScrolling = -1;
        }
    }
}

这是您的自定义OnScrollListener,用于检查scrollState是否为IDLE。这是否为真-〉没有人在滚动。因此'int viewIsScolling = -1
现在你需要到检测如果你能滚动.这是这代码:

int viewIsScrolling = 1;
boolean firstIsTouched = false;
boolean secondIsTouched = false;
SelfScrolListener firstOSL= new SelfScrolListener() {
    @Override
    public void onScrolled(@NonNull final RecyclerView recyclerView, final int dx, final int dy) {
        super.onScrolled(recyclerView, dx, dy);

        if (firstIsTouched) {
             if (viewIsScrolling == -1) {
                 viewIsScrolling = 0;
             }
             if (viewIsScrolling == 0) {
                 secondRecyclerView.scrollBy(dx, dy);
             }
        }
    }
};
SelfScrolListener secondOSL= new SelfScrolListener() {
    @Override
    public void onScrolled(@NonNull final RecyclerView recyclerView, final int dx, final int dy) {
        super.onScrolled(recyclerView, dx, dy);
        if(secondIsTouched){
             if (viewIsScrolling == -1) {
                 viewIsScrolling = 1;
             }
             if (viewIsScrolling == 1) {
                 firstRecyclerView.scrollBy(dx, dy);
             }
        }
    }
};
firstRecyclerView.setOnTouchListener(new View.OnTouchListener() {
    @Override
    public boolean onTouch(View v, MotionEvent event) {
        firstIsTouched= true;
        return false;
    }
});
secondRecyclerView.setOnTouchListener(new View.OnTouchListener() {
    @Override
    public boolean onTouch(View v, MotionEvent event) {
        secondIsTouched= true;
        return false;
    }
});
firstRecyclerView.addOnScrollListener(firstOSL);
secondRecyclerView.addOnScrollListener(secondOSL);

viewIsScrolling =一个全局整数,开始时设置为-1;没有人在滚动的状态。你可以随意添加循环视图。

pu3pd22g

pu3pd22g4#

此解决方案处理fling。演示项目here
假设您有三个水平RecyclerView。

<androidx.constraintlayout.widget.ConstraintLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/rv0"
        android:layout_width="match_parent"
        android:layout_height="@dimen/itemSize"
        app:layoutManager="androidx.recyclerview.widget.LinearLayoutManager"
        android:orientation="horizontal"
        app:layout_constraintTop_toTopOf="parent"
        />

    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/rv1"
        android:layout_width="match_parent"
        android:layout_height="@dimen/itemSize"
        app:layoutManager="androidx.recyclerview.widget.LinearLayoutManager"
        android:orientation="horizontal"
        android:layout_marginTop="5dp"
        app:layout_constraintTop_toBottomOf="@id/rv0"
        />

    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/rv2"
        android:layout_width="match_parent"
        android:layout_height="@dimen/itemSize"
        app:layoutManager="androidx.recyclerview.widget.LinearLayoutManager"
        android:orientation="horizontal"
        android:layout_marginTop="5dp"
        app:layout_constraintTop_toBottomOf="@id/rv1"
        />

</androidx.constraintlayout.widget.ConstraintLayout>

1.为每个RecyclerView添加标记。例如:

val rvs = arrayListOf(rv0, rv1, rv2)

for (i in 0 until rvs.size) {
    rvs[i].tag = i
}

1.将相同的OnItemTouchListener添加到每个RecyclerView,以了解哪个RecyclerView处于活动状态。如果已经存在活动的RecyclerView,则对其调用stopScroll(如果活动的RecyclerView处于fling状态,则可防止不同步)

var touchedRVTag = -1

val itemTouchListener = object : RecyclerView.OnItemTouchListener {
    override fun onTouchEvent(rv: RecyclerView, e: MotionEvent) {}

    override fun onInterceptTouchEvent(rv: RecyclerView, e: MotionEvent): Boolean 
    {
        val rvTag = rv.tag as Int

        if (touchedRVTag != -1 && touchedRVTag != rvTag) {
            rvs[touchedRVTag].stopScroll()
        }

        touchedRVTag = rvTag

        return false
    }

    override fun onRequestDisallowInterceptTouchEvent(disallowIntercept: Boolean) {}
}

for (i in 0 until rvs.size) {
    rvs[i].addOnItemTouchListener(itemTouchListener)
}

1.向每个回收视图添加相同的OnScrollListener以滚动其他回收视图

val scrollListener = object : RecyclerView.OnScrollListener() {
    override fun onScrolled(recyclerView: RecyclerView, dx: Int, dy: Int) {
        val currentRVTag = recyclerView.tag as Int

        if (currentRVTag == touchedRVTag) {
            for (rvTag in 0 until rvs.size) {
                if (rvTag != currentRVTag) {
                    rvs[rvTag].scrollBy(dx, 0)
                }
            }
        }
    }
}

for (i in 0 until rvs.size) {
    rvs[i].addOnScrollListener(scrollListener)
}

PS:如果你想滚动任何RecyclerView编程设置其标签,然后滚动:

touchedRVTag = rv0.tag as Int
rv0.scrollBy(dx, 0)
s8vozzvw

s8vozzvw5#

Kotlin版本,这一个不处理投掷(尚未)

class ScrollSynchronizer {
    val boundRecyclerViews: ArrayList<RecyclerView> = ArrayList()
    var verticalOffset = 0

    private val scrollListener = object: RecyclerView.OnScrollListener() {
        override fun onScrolled(recyclerView: RecyclerView, dx: Int, dy: Int) {
            super.onScrolled(recyclerView, dx, dy)
            // scroll every other rv to the same position
            boundRecyclerViews.filter { it != recyclerView }.forEach { targetView ->
                targetView.removeOnScrollListener(this)
                targetView.scrollBy(dx, dy)
                targetView.addOnScrollListener(this)
            }
        }

        override fun onScrollStateChanged(recyclerView: RecyclerView, newState: Int) {
            super.onScrollStateChanged(recyclerView, newState)
            if (newState == RecyclerView.SCROLL_STATE_IDLE) {
                verticalOffset = recyclerView.computeVerticalScrollOffset()
            }
        }
    }

    fun add(view: RecyclerView) {
        with (view) {
            if (boundRecyclerViews.contains(view)) {
                removeOnScrollListener(scrollListener)
                boundRecyclerViews.remove(this)
            }
            addOnScrollListener(scrollListener)
            boundRecyclerViews.add(this)
        }
    }

    fun scrollToLastOffset(rv: RecyclerView) {
        rv.removeOnScrollListener(scrollListener)
        val currentOffset = rv.computeVerticalScrollOffset()
        if (currentOffset != verticalOffset) {
            rv.scrollBy(0, verticalOffset - currentOffset)
        }
        rv.addOnScrollListener(scrollListener)
    }

    fun disable() = boundRecyclerViews.forEach { it.removeOnScrollListener(scrollListener) }

    fun enable() = boundRecyclerViews.forEach { it.addOnScrollListener(scrollListener) }

    fun addAll(recyclerViews: List<RecyclerView>) = recyclerViews.forEach { add(it) }
}

编辑:按照@Groovee60的评论和建议,将onScrolled替换为:

// scroll every other rv to the same position
            val otherRvs = boundRecyclerViews.filter { it != recyclerView }
            otherRvs.forEach { targetView -> targetView.removeOnScrollListener(this) }
            otherRvs.forEach { targetView -> targetView.scrollBy(dx, dy) }
            otherRvs.forEach { targetView -> targetView.addOnScrollListener(this) }
jaxagkaj

jaxagkaj6#

首先考虑使用NestedScrollView作为RecyclerViews的父对象,这可能需要一些额外的调整,但总体思路是相同的:

<android.support.v4.widget.NestedScrollView
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <android.support.v7.widget.RecyclerView
        android:id="@+id/recycler_1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

    <android.support.v7.widget.RecyclerView
        android:id="@+id/recycler_2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

    <android.support.v7.widget.RecyclerView
        android:id="@+id/recycler_3"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

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

如果你因为某些原因不能做到这一点,你可以通过编程来同步滚动。只是需要避免onScrolled()事件回调的无限循环,就像在其他答案中提到的那样。换句话说,当你通过编程开始滚动时,你在onScroll()内部什么也不做,直到你通过编程完成滚动。并且不要通过编程滚动最初滚动的RecyclerView
放入要同步的所有回收器

List<RecyclerView> syncRecyclers

呼叫

addSyncListeners()

好好享受

public class SyncScrollActivity extends AppCompatActivity {
    private List<RecyclerView> syncRecyclers;
    private boolean isProgrammaticallyScrolling = false;

    private void addSyncListeners() {
        for (RecyclerView recyclerView : syncRecyclers) {
            recyclerView.addOnScrollListener(new SyncOnScrollListener());
        }
    }

    private class SyncOnScrollListener extends RecyclerView.OnScrollListener {
        @Override
        public void onScrolled(@NonNull RecyclerView recyclerView, int dx, int dy) {
            if (!isProgrammaticallyScrolling) {
                isProgrammaticallyScrolling = true;
                scrollAll(recyclerView, dx, dy);
                isProgrammaticallyScrolling = false;
            }
        }
    }

    private void scrollAll(RecyclerView exceptRecycler, int dx, int dy) {
        for (RecyclerView recyclerView : syncRecyclers) {
            if (!recyclerView.equals(exceptRecycler)) {
                recyclerView.scrollBy(dx, dy);
            }
        }
    }
}
iswrvxsc

iswrvxsc7#

在寻呼机适配器中创建变量,该变量负责保存其页面的当前scrollY位置,无论何时getItem(position)将调用更新ListView位置,请查看https://github.com/ksoichiro/Android-ObservableScrollView/blob/master/samples/src/main/java/com/github/ksoichiro/android/observablescrollview/samples/ViewPagerTabActivity.java中的CacheFragmentStatePagerAdapter

uhry853o

uhry853o8#

我发现了一个非常简单的解决方案,它没有任何标志,而且非常动态
首先,您必须创建RecyclerView.OnScrollListener,并为该侦听器订阅您希望的每个水平布局。RecyclerView.OnScrollListener

val scrollListener = object : RecyclerView.OnScrollListener() {
                override fun onScrolled(recyclerView: RecyclerView, dx: Int, dy: Int) {
                    super.onScrolled(recyclerView, dx, dy)
                    horizontalScroll(this, recyclerView, dx)
                }
            }


fun horizontalScroll(
            scrollListener: RecyclerView.OnScrollListener,
            currentRecycler: RecyclerView,
            dx: Int
        ) {
            for (i in 0..parentRecyclerView.childCount) {
                val childRecyclerView =
                    parentRecyclerView.getChildAt(i)?.findViewById<RecyclerView>(R.id.recyclerView)
                if (currentRecycler != childRecyclerView) {
                    childRecyclerView?.removeOnScrollListener(scrollListener)
                    childRecyclerView?.scrollBy(dx, 0)
                    childRecyclerView?.addOnScrollListener(scrollListener)
                }
            }
        }

请注意RecyclerView必须具有相同的layout.id。在具有水平行的垂直RecyclerView的情况下非常有用

qxgroojn

qxgroojn9#

这个怎么样?

fun start(main: RecyclerView, attach: RecyclerView) {
    attach.setOnTouchListener { _, motionEvent ->
        main.dispatchTouchEvent(motionEvent)
        true
    }
    main.addOnScrollListener(object : RecyclerView.OnScrollListener() {
        override fun onScrolled(recyclerView: RecyclerView, dx: Int, dy: Int) {
            super.onScrolled(recyclerView, dx, dy)
            attach.scrollBy(dx, dy)
        }
    })
}

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