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RecyclerVIew自動スクロールで、ニュースフィードなどのようにすべての要素を表示します。

RecyclerViewをスムーズに自動スクロールして、ユーザーがRecyclerViewのすべての要素を表示し、ニュースフィードなどのように最初からもう一度スクロールできるようにする方法。

smoothScrollToPosition()とscrollToPosition()は知っていますが、最後の要素までスクロールが速すぎてしまいます。

RecyclerViewをアニメーション化し、ゆっくりと動かしたい。

androidscrollandroid-recyclerviewrecycler-adapter
8
Mohammad Aasif

答えを少し改善するために、スムーズなアニメーションで無限大を自動スクロールします。

final int speedScroll = 1200;
final Handler handler = new Handler();
final Runnable runnable = new Runnable() {
    int count = 0;
    boolean flag = true;
    @Override
    public void run() {
        if(count < adapter.getItemCount()){
            if(count==adapter.getItemCount()-1){
                flag = false;
            }else if(count == 0){
                flag = true;
            }
            if(flag) count++;
            else count--;

            recyclerView.smoothScrollToPosition(count);
            handler.postDelayed(this,speedScroll);
        }
    }
};

handler.postDelayed(runnable,speedScroll);

これはまさにあなたの答えですが、よりスムーズなアニメーションにリンクする場合は、LayoutManagerを使用してください

recyclerView.setLayoutManager(new CustomLinearLayoutManager(mContext, LinearLayoutManager.HORIZONTAL, false));

アニメーションの変更を制御しますMILLISECONDS_PER_INCH値。

public class CustomLinearLayoutManager extends LinearLayoutManager {
    public CustomLinearLayoutManager(Context context) {
        super(context);
    }

    public CustomLinearLayoutManager(Context context, int orientation, boolean reverseLayout) {
        super(context, orientation, reverseLayout);
    }

    public CustomLinearLayoutManager(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
        super(context, attrs, defStyleAttr, defStyleRes);
    }

    @Override
    public void smoothScrollToPosition(RecyclerView recyclerView, RecyclerView.State state, int position) {
        final LinearSmoothScroller linearSmoothScroller =
                new LinearSmoothScroller(recyclerView.getContext()) {
                    private static final float MILLISECONDS_PER_INCH = 200f;

                    @Override
                    public PointF computeScrollVectorForPosition(int targetPosition) {
                        return CustomLinearLayoutManager.this
                                .computeScrollVectorForPosition(targetPosition);
                    }

                    @Override
                    protected float calculateSpeedPerPixel
                            (DisplayMetrics displayMetrics) {
                        return MILLISECONDS_PER_INCH / displayMetrics.densityDpi;
                    }
                };
        linearSmoothScroller.setTargetPosition(position);
        startSmoothScroll(linearSmoothScroller);
    }
}
19
Md Imran Choudhury

これが最善の解決策だと思います。

    final int speedScroll = 150;
    final Handler handler = new Handler();
    final Runnable runnable = new Runnable() {
        int count = 0;
        @Override
        public void run() {
            if(count < list.size()){
                recyclerView.scrollToPosition(++count);
                handler.postDelayed(this,speedScroll);
            }


        }
    };

    handler.postDelayed(runnable,speedScroll);
9
Nitin Jain

試行錯誤の後、これは私にとって完璧に機能します

_    final RecyclerView mRecyclerViewr;
    final ArrayList<String> stringArrayData = new ArrayList<String>
    final LinearLayoutManager linearLayoutManager = new LinearLayoutManager(getApplicationContext(), LinearLayoutManager.HORIZONTAL, false);
    mRecyclerViewr.setLayoutManager(linearLayoutManager);
    CustomAdapter customAdapter = new CustomAdapter(getApplicationContext(), topPriceBarList);
    mRecyclerViewr.setAdapter(customAdapter);

        // Auto Scroll Left To Right
        final int scrollSpeed = 100;   // Scroll Speed in Milliseconds
        final Handler handler = new Handler();
        final Runnable runnable = new Runnable() {
            int x = 15;        // Pixels To Move/Scroll
            boolean flag = true;
            // Find Scroll Position By Accessing RecyclerView's LinearLayout's Visible Item Position
            int scrollPosition = linearLayoutManager.findLastCompletelyVisibleItemPosition();  
            int arraySize = stringArrayData.size();  // Gets RecyclerView's Adapter's Array Size

            @Override
            public void run() {
                if (scrollPosition < arraySize) {
                    if (scrollPosition == arraySize - 1) {
                        flag = false;
                    } else if (scrollPosition <= 1) {
                        flag = true;
                    }
                    if (!flag) {
                        try {
                            // Delay in Seconds So User Can Completely Read Till Last String
                            TimeUnit.SECONDS.sleep(1); 
                            mRecyclerViewr.scrollToPosition(0);  // Jumps Back Scroll To Start Point
                        } catch (InterruptedException e) {
                            e.printStackTrace();
                        }
                    }
                    // Know The Last Visible Item
                    scrollPosition = linearLayoutManager.findLastCompletelyVisibleItemPosition();

                    mRecyclerViewr.smoothScrollBy(x, 0);
                    handler.postDelayed(this, scrollSpeed);
                }
            }
        };
        handler.postDelayed(runnable, scrollSpeed);
_

これにより、RecyclerViewが最後まで自動スクロールされ、1秒待ちます_(So User Can Read Till End)_そしてジャンプ/最初の文字列にスクロールバック RecyclerViewの配列リスト内。正と負の方向に自動スクロールしたい場合You Just Need To Change The Condition Instead Of Using if(!flag) You Need To Set Value Of x in it

_    if (flag) x = 15;
    else x= -15;  // For Auto Scroll To Negative i.e Left Direction
_
1
The.N00B.One

Kotlinでの簡体字：

 GlobalScope.launch(Dispatchers.Main, start = CoroutineStart.DEFAULT) {
        var position = MINIMUM_POSITION
        repeat(AUTO_SCROLL_REPEATING_TIMES) {
            delay(SCROLL_DELAY)
            rvBanners.smoothScrollToPosition(position)
            when {
                position+1 == listSize -> position = 0
                position == 0 -> position = MINIMUM_POSITION
                else -> position++
            }
        }
    }

特定の時間に自動スクロールを開始する場合：

val job = GlobalScope.launch(Dispatchers.Main, start = CoroutineStart.LAZY) {
        var position = MINIMUM_POSITION
        repeat(AUTO_SCROLL_REPEATING_TIMES) {
            delay(SCROLL_DELAY)
            rvBanners.smoothScrollToPosition(position)
            when {
                position+1 == listSize -> position = 0
                position == 0 -> position = MINIMUM_POSITION
                else -> position++
            }
        }
    }
...
job.start()
1
Emmanuel Guerra

Recyclerviewをアダプタに設定した後、この方法で実装することもできます

final int duration = 10;
final int pixelsToMove = 263;
final Handler mHandler = new Handler(Looper.getMainLooper());

final Runnable SCROLLING_RUNNABLE = new Runnable() {
        @Override
        public void run() {
            recyclerView.smoothScrollBy(pixelsToMove, 0);
            mHandler.postDelayed(this, duration);
        }
    };

recyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
        @Override
        public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
            super.onScrolled(recyclerView, dx, dy);
            int lastItem = horizontalLayoutManager.findLastCompletelyVisibleItemPosition();
            if (lastItem == horizontalLayoutManager.getItemCount() - 1) {
                mHandler.removeCallbacks(SCROLLING_RUNNABLE);
                Handler postHandler = new Handler();
                postHandler.postDelayed(new Runnable() {
                    @Override
                    public void run() {
                        quickTips.setAdapter(null);
                        quickTips.setAdapter(adapter);
                        mHandler.postDelayed(SCROLLING_RUNNABLE, 2000);
                    }
                }, 2000);
            }
        }
    });
    mHandler.postDelayed(SCROLLING_RUNNABLE, 2000);
0
Kavya Shravan

これは、Auto Scroll RecyclerViewおよびその100％が機能するための最良の方法です：

  RecyclerView recyclerView = findViewById(R.id.rv_id);

  final int time = 4000; // it's the delay time for sliding between items in recyclerview

    final Adapter adapter = new Adapter(dataItems);
    recyclerView.setAdapter(adapter);

    final LinearLayoutManager linearLayoutManager = new LinearLayoutManager(rootView.getContext(), LinearLayoutManager.HORIZONTAL, false);
    recyclerView.setLayoutManager(linearLayoutManager);

    //The LinearSnapHelper will snap the center of the target child view to the center of the attached RecyclerView , it's optional if you want , you can use it
    final LinearSnapHelper linearSnapHelper = new LinearSnapHelper();
    linearSnapHelper.attachToRecyclerView(recyclerView); 

    final Timer timer = new Timer();
    timer.schedule(new TimerTask() {

        @Override
        public void run() {

            if (linearLayoutManager.findLastCompletelyVisibleItemPosition() < (adapter.getItemCount() - 1)) {

                linearLayoutManager.smoothScrollToPosition(recyclerView, new RecyclerView.State(), linearLayoutManager.findLastCompletelyVisibleItemPosition() + 1);
            }

            else if (linearLayoutManager.findLastCompletelyVisibleItemPosition() == (adapter.getItemCount() - 1)) {

                linearLayoutManager.smoothScrollToPosition(recyclerView, new RecyclerView.State(), 0);
            }
        }
    }, 0, time);
0
parsa dadras
private void hanldeAutoScroll() {


    int position=0;

    final int duration = 2000;
    //final int pixelsToMove = 90;

    final Handler mHandler = new Handler(Looper.getMainLooper());
     final Runnable SCROLLING_RUNNABLE = new Runnable() {

        @Override
        public void run() {

            position++;

            if (position<urls.size())
            {
                recyclerView.scrollToPosition(position);

            }else if (position==urls.size())
            {

                position=-1;

            }

           // recyclerView.smoothScrollBy(pixelsToMove, 0);
            mHandler.postDelayed(this, duration);
        }
    };
    mHandler.postDelayed(SCROLLING_RUNNABLE, 2000);




}
0
jagadishlakkurcom jagadishlakk