How to animate from 2 columns to 1?

[bahacan19]

I am using a recyclerview right now. when i fully copy and implement your code in my project working well but how can i animate my 2 column recyclerview to 1 column? And also 1column -> 2 column again.
Thanks

[notsatyarth]

Hello!This was just a possible sample for a SO question.You could just modify the grid size and and change the spansize lookup to return 1 or 2 based on a setting

[bahacan19]

Thanks for your reply.
There is one more problem that i dont know how to deal with it. When recyclerview inflated, for 5 seconds or more no data is showing (even gridAdap.addData(imageUriList); called ). After that images are coming with animation as it's supposed to be. How can I prevent this startup delay?
Thanks

[notsatyarth]

You could be adding a lot of data which involves an initital layout calculations.Although you can batch them and reduce your load time. How many items are you adding?and how complex is your layout?

[bahacan19]

40 items on start. My item layout is

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="76dp"
    android:layout_height="59dp"
    android:background="#fff"
    android:orientation="vertical"
    android:padding="3dp"
    tools:ignore="MissingPrefix">


    <android.support.v7.widget.AppCompatImageView
        android:id="@+id/image"
        android:scaleType="centerCrop"
        android:layout_width="70dp"
        android:layout_height="53dp"/>

    <View
        android:layout_width="70dp"
        android:layout_height="53dp"
        android:background="@drawable/list_hotel_hover" />

    <TextView
        android:id="@+id/stars"
        fontPath="fonts/FontAwesome.ttf"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="right"
        android:textColor="#FFB800" />

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_gravity="bottom"
        android:layout_margin="3dp"
        android:orientation="vertical">

        <TextView
            android:id="@+id/title"
            fontPath="fonts/Roboto-Regular.ttf"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:ellipsize="end"
            android:maxLines="1"
            android:textColor="#ffffff" />

        <TextView
            android:id="@+id/price"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="1dp"
            android:textColor="#ffffff" />
    </LinearLayout>
</FrameLayout>

[notsatyarth]

your adapter initialization code too

[bahacan19]

Adapter

public class HotelListAdapter extends RecyclerView.Adapter<HotelListAdapter.ViewHolder> {


    public static final int totalSpan = 100;
    private int currentSpan;
    private int spanConstant = 40;
    private int multiplier = 1;
    private GridRecyclerView grv;


    private List<Result> mDataset;
    private String nightPlaceHolder;
    private String fromPlaceHolder;
    private GridLayoutManager.SpanSizeLookup scalableSpanSizeLookUp = new GridLayoutManager.SpanSizeLookup() {
        @Override
        public int getSpanSize(int position) {
            return getCurrentSpan();
        }
    };

    public HotelListAdapter(List<Result> myDataset, GridRecyclerView GV) {
        super();
        mDataset = myDataset;
        this.grv = GV;
        currentSpan = spanConstant;
    }

    public List<Result> getmDataset() {
        return mDataset;
    }

    public void updateDataSet(List<Result> mDataset) {
        this.mDataset = mDataset;
        notifyDataSetChanged();
    }

    @Override
    public HotelListAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View v = LayoutInflater.from(parent.getContext())
                .inflate(R.layout.hotel_result_item, parent, false);
        ViewHolder vh = new ViewHolder(v);
        return vh;
    }

    @Override
    public void onBindViewHolder(HotelListAdapter.ViewHolder holder, int position) {


        Result r = mDataset.get(position);
        Picasso.with(holder.mImage.getContext()).load(r.getPhotoUrl())
                .placeholder(R.drawable.hotel_listing_placeholder)
                .transform(new RoundedTransformation(holder.mImage.getContext().getResources().getDimensionPixelSize(R.dimen._2sdp), 0))
                .resizeDimen(R.dimen._70sdp, R.dimen._53sdp)
                .centerCrop()
                .into(holder.mImage);
        int raiting = r.getHotelClass();
        String s = "";
        for (int i = 0; i < raiting; i++) {
            s = s + "\uF005";//dolu yıldız
        }
        holder.stars.setText(s);
        holder.stars.setPadding(0, 5, 0, 0);
        holder.title.setText(r.getName());
        if (r.getProducts().size() > 0) {
            String price = String.valueOf(r.getProducts().get(0).getPrice());
            String productCurrency = r.getProducts().get(0).getCurrency();
            if (nightPlaceHolder == null)
                nightPlaceHolder = holder.price.getContext().getResources().getString(R.string.night);
            if (fromPlaceHolder == null)
                fromPlaceHolder = holder.price.getContext().getResources().getString(R.string.from);

            String formatted = OCApplication.formatTextWithCurrencyCode(productCurrency, price);
            String fullText = fromPlaceHolder + formatted + nightPlaceHolder;
            SpannableStringBuilder sBuilder = new SpannableStringBuilder(fullText);
            sBuilder.setSpan(ViewUtils.getLightSpan(holder.price.getContext()), 0, fromPlaceHolder.length(), Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
            sBuilder.setSpan(ViewUtils.getBoldSpan(holder.price.getContext()), fromPlaceHolder.length(), fromPlaceHolder.length() + formatted.length(), Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
            sBuilder.setSpan(ViewUtils.getLightSpan(holder.price.getContext()), fromPlaceHolder.length() + formatted.length(), fullText.length(), Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
            holder.price.setText(sBuilder, TextView.BufferType.SPANNABLE);
            holder.price.setVisibility(View.VISIBLE);
        } else {
            holder.price.setVisibility(View.GONE);
        }
    }

    @Override
    public int getItemCount() {
        return mDataset.size();
    }

    public Result getItem(int pos) {
        return mDataset.get(pos);
    }

    public void animate(int position) {
        setCurrentSpan(this.currentSpan==80 ?40 :80);
        delayedNotify(position, calculateRange());
    }

    public GridLayoutManager.SpanSizeLookup getScalableSpanSizeLookUp() {
        return scalableSpanSizeLookUp;
    }

    public int calculateRange() {
        int start = ((GridLayoutManager) grv.getLayoutManager()).findFirstVisibleItemPosition();
        int end = ((GridLayoutManager) grv.getLayoutManager()).findLastVisibleItemPosition();
        if (start < 0)
            start = 0;
        if (end < 0)
            end = 0;
        return end - start;
    }

    public int getCurrentSpan() {
        return currentSpan;
    }

    public void setCurrentSpan(int span) {
        this.currentSpan = span;

    }

    public void delayedNotify(final int pos, final int range) {
        grv.postDelayed(new Runnable() {
            @Override
            public void run() {
                notifyItemRangeChanged(pos - range > 0 ? pos - range : 0, range * 2 < getItemCount() ? range * 2 : range);
            }
        }, 100);
    }

    public static class ViewHolder extends RecyclerView.ViewHolder {
        public ImageView mImage;
        public TextView stars;
        public TextView title;
        public TextView price;

        public ViewHolder(View v) {
            super(v);
            mImage = (ImageView) v.findViewById(R.id.image);
            stars = (TextView) v.findViewById(R.id.stars);
            title = (TextView) v.findViewById(R.id.title);
            price = (TextView) v.findViewById(R.id.price);
        }

    }
}

Init

 adapter = new HotelListAdapter(hotelsResponse.results, hotelsRecyclerView);
 hotelsRecyclerView.setLayoutManager(layoutManager);
 layoutManager.setSpanSizeLookup(adapter.getScalableSpanSizeLookUp());
 hotelsRecyclerView.setAdapter(adapter);
 hotelsRecyclerView.addOnItemTouchListener(new RecyclerItemClickListener(this, (view, position) -> {

           adapter.animate(position);

        }));

[notsatyarth]

can you check if your fps is stable on scroll? using the gpu overdraw function

[bahacan19]

Actually this bug appears in your project too. Gallery images comes up too late.

[notsatyarth]

Are the place holders placed?Can it just be the image decoding is taking time?

[notsatyarth]

Sorry i'm slightly busy right now.I'll look into the code this weekend if thats fine