try with this one, it may helps you
RecyclerView recyclerView = findViewById(R.id.recyclerview);
final int time = 2000; // it's the delay time for sliding between items in recyclerview
final AdapterClass adapter = new AdapterClass(list,context);
final CenterZoomLayoutManager linearLayoutManager = new CenterZoomLayoutManager(context, CenterZoomLayoutManager.HORIZONTAL, false);
recyclerView.setLayoutManager(linearLayoutManager);
// if list size is greater then zero then use it for zoom first item automatially
linearLayoutManager.setTargetStartPos(1,1);
recyclerView.setAdapter(adapter);
//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 linearSnapHelperClass = new LinearSnapHelper();
linearSnapHelperClass.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);
Use this class for center zoom image.
package com.example.android.androidtask.model;
import android.content.Context;
import android.os.Parcelable;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.View;
public class CenterZoomLayoutManager extends LinearLayoutManager {
private final float mShrinkAmount = 0.15f;
private final float mShrinkDistance = 0.9f;
private int mPendingTargetPos = -1;
private int mPendingPosOffset = -1;
public CenterZoomLayoutManager(Context context) {
super(context);
}
public CenterZoomLayoutManager(Context context, int orientation, boolean reverseLayout) {
super(context, orientation, reverseLayout);
}
@Override
public int scrollVerticallyBy(int dy, RecyclerView.Recycler recycler, RecyclerView.State state) {
int orientation = getOrientation();
if (orientation == VERTICAL) {
int scrolled = super.scrollVerticallyBy(dy, recycler, state);
float midpoint = getHeight() / 2.f;
float d0 = 0.f;
float d1 = mShrinkDistance * midpoint;
float s0 = 1.f;
float s1 = 1.f - mShrinkAmount;
for (int i = 0; i < getChildCount(); i++) {
View child = getChildAt(i);
float childMidpoint =
(getDecoratedBottom(child) + getDecoratedTop(child)) / 2.f;
float d = Math.min(d1, Math.abs(midpoint - childMidpoint));
float scale = s0 + (s1 - s0) * (d - d0) / (d1 - d0);
child.setScaleX(scale);
child.setScaleY(scale);
}
return scrolled;
} else {
return 0;
}
}
@Override
public int scrollHorizontallyBy(int dx, RecyclerView.Recycler recycler, RecyclerView.State state) {
int orientation = getOrientation();
if (orientation == HORIZONTAL) {
int scrolled = super.scrollHorizontallyBy(dx, recycler, state);
float midpoint = getWidth() / 2.f;
float d0 = 0.f;
float d1 = mShrinkDistance * midpoint;
float s0 = 1.f;
float s1 = 1.f - mShrinkAmount;
for (int i = 0; i < getChildCount(); i++) {
View child = getChildAt(i);
float childMidpoint =
(getDecoratedRight(child) + getDecoratedLeft(child)) / 2.f;
float d = Math.min(d1, Math.abs(midpoint - childMidpoint));
float scale = s0 + (s1 - s0) * (d - d0) / (d1 - d0);
child.setScaleX(scale);
child.setScaleY(scale);
}
return scrolled;
} else {
return 0;
}
}
@Override
public void onLayoutChildren(RecyclerView.Recycler recycler, RecyclerView.State state) {
if (mPendingTargetPos != -1 && state.getItemCount() > 0) {
/*
Data is present now, we can set the real scroll position
*/
scrollToPositionWithOffset(mPendingTargetPos, mPendingPosOffset);
mPendingTargetPos = -1;
mPendingPosOffset = -1;
}
super.onLayoutChildren(recycler, state);
}
@Override
public void onRestoreInstanceState(Parcelable state) {
/*
May be needed depending on your implementation.
Ignore target start position if InstanceState is available (page existed before already, keep position that user scrolled to)
*/
mPendingTargetPos = -1;
mPendingPosOffset = -1;
super.onRestoreInstanceState(state);
}
/**
* Sets a start position that will be used <b>as soon as data is available</b>.
* May be used if your Adapter starts with itemCount=0 (async data loading) but you need to
* set the start position already at this time. As soon as itemCount > 0,
* it will set the scrollPosition, so that given itemPosition is visible.
* @param position
* @param offset
*/
public void setTargetStartPos(int position, int offset) {
mPendingTargetPos = position;
mPendingPosOffset = offset;
}
}
This is the best way to **Auto Scroll RecyclerView** and its **100%** working :
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);
