View Pager with previous and next item smaller in size with infinite scroll

Question

Want to create the view pager same as following UI, applied custom transformer but not working.

ViewPager.java

public class MyViewPager extends ViewPager implements ViewPager.PageTransformer {
public static final String TAG = "MyViewPager";
private float MAX_SCALE = 0.0f;
private int mPageMargin;
private boolean animationEnabled=true;
private boolean fadeEnabled=false;
private  float fadeFactor=0.5f;


public MyViewPager(Context context) {
    this(context, null);
}

public MyViewPager(Context context, AttributeSet attrs) {
    super(context, attrs);
    // clipping should be off on the pager for its children so that they can scale out of bounds.
    setClipChildren(false);
    setClipToPadding(false);
    // to avoid fade effect at the end of the page
    setOverScrollMode(2);
    setPageTransformer(false, this);
    setOffscreenPageLimit(3);
    mPageMargin = dp2px(context.getResources(), 50);
    setPadding(mPageMargin, mPageMargin, mPageMargin, mPageMargin);
}

public int dp2px(Resources resource, int dp) {
    return (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, dp, resource.getDisplayMetrics());
}
public void setAnimationEnabled(boolean enable) {
    this.animationEnabled = enable;
}

public void setFadeEnabled(boolean fadeEnabled) {
    this.fadeEnabled = fadeEnabled;
}

public void setFadeFactor(float fadeFactor) {
    this.fadeFactor = fadeFactor;
}

@Override
public void setPageMargin(int marginPixels) {
    mPageMargin = marginPixels;
// setPadding(mPageMargin, mPageMargin, mPageMargin, mPageMargin);
}

@Override
public void transformPage(View page, float position) {
    if (mPageMargin <= 0|| !animationEnabled)
        return;
    page.setPadding(mPageMargin / 3, mPageMargin / 3, mPageMargin / 3, mPageMargin / 3);

    if (MAX_SCALE == 0.0f && position > 0.0f && position < 1.0f) {
        MAX_SCALE = position;
    }
    position = position - MAX_SCALE;
    float absolutePosition = Math.abs(position);
    if (position <= -1.0f || position >= 1.0f) {
        if(fadeEnabled)
            page.setAlpha(fadeFactor);
        // Page is not visible -- stop any running animations

    } else if (position == 0.0f) {

        // Page is selected -- reset any views if necessary
        page.setScaleX((1 + MAX_SCALE));
        page.setScaleY((1 + MAX_SCALE));
        page.setAlpha(1);
    } else {
        page.setScaleX(1 + MAX_SCALE * (1 - absolutePosition));
        page.setScaleY(1 + MAX_SCALE * (1 - absolutePosition));
        if(fadeEnabled)
            page.setAlpha( Math.max(fadeFactor, 1 - absolutePosition));
    }
}
}

Solution 1

UPDATE - if you want to make current page zoom use below PageTransformer

import android.os.Bundle;
import androidx.appcompat.app.AppCompatActivity;
import androidx.viewpager2.widget.ViewPager2;

public class JavaActivity extends AppCompatActivity {

    ViewPager2 myViewPager2;
    MyAdapter MyAdapter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_java);

        myViewPager2 = findViewById(R.id.viewpager);

        MyAdapter = new MyAdapter(this);
        myViewPager2.setOrientation(ViewPager2.ORIENTATION_HORIZONTAL);
        myViewPager2.setAdapter(MyAdapter);
        myViewPager2.setOffscreenPageLimit(3);

        float pageMargin = getResources().getDimensionPixelOffset(R.dimen.pageMargin);
        float pageOffset = getResources().getDimensionPixelOffset(R.dimen.offset);

        myViewPager2.setPageTransformer((page, position) -> {
            float myOffset = position * -(2 * pageOffset + pageMargin);
            if (position < -1) {
                page.setTranslationX(-myOffset);
            } else if (position <= 1) {
                float scaleFactor = Math.max(0.7f, 1 - Math.abs(position - 0.14285715f));
                page.setTranslationX(myOffset);
                page.setScaleY(scaleFactor);
                page.setAlpha(scaleFactor);
            } else {
                page.setAlpha(0);
                page.setTranslationX(myOffset);
            }
        });

    }
}

OUTPUT

NOTE: you can download complete code from my GitHub repositories

Try this way

JavaActivity

import android.os.Bundle;
import android.view.View;
import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.view.ViewCompat;
import androidx.viewpager2.widget.ViewPager2;

public class JavaActivity extends AppCompatActivity {

    ViewPager2 myViewPager2;
    MyAdapter MyAdapter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_java);

        myViewPager2 = findViewById(R.id.viewpager);

        MyAdapter = new MyAdapter(this);
        myViewPager2.setOrientation(ViewPager2.ORIENTATION_HORIZONTAL);
        myViewPager2.setAdapter(MyAdapter);
        myViewPager2.setOffscreenPageLimit(3);

        float pageMargin= getResources().getDimensionPixelOffset(R.dimen.pageMargin);
        float pageOffset = getResources().getDimensionPixelOffset(R.dimen.offset);
        
        myViewPager2.setPageTransformer(new ViewPager2.PageTransformer() {
            @Override
            public void transformPage(@NonNull View page, float position) {
                float myOffset = position * -(2 * pageOffset + pageMargin);
                if (myViewPager2.getOrientation() == ViewPager2.ORIENTATION_HORIZONTAL) {
                    if (ViewCompat.getLayoutDirection(myViewPager2) == ViewCompat.LAYOUT_DIRECTION_RTL) {
                        page.setTranslationX(-myOffset);
                    } else {
                        page.setTranslationX(myOffset);
                    }
                } else {
                    page.setTranslationY(myOffset);
                }
            }
        });
    }
}

activity_java layout file

    <?xml version="1.0" encoding="utf-8"?>
    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
                  xmlns:app="http://schemas.android.com/apk/res-auto"
                  xmlns:tools="http://schemas.android.com/tools"
                  android:layout_width="match_parent"
                  android:layout_height="match_parent"
                  android:orientation="vertical"
                  tools:context=".JavaActivity">
    
        <androidx.viewpager2.widget.ViewPager2
                android:id="@+id/viewpager"
                android:clipToPadding="false"
                android:clipChildren="false"
                android:layout_width="match_parent"
                android:layout_height="match_parent"/>
    
    </LinearLayout>

>

MyAdapter

import android.content.Context;
import android.graphics.Color;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;
import androidx.annotation.NonNull;
import androidx.recyclerview.widget.RecyclerView;

public class MyAdapter extends RecyclerView.Adapter<MyAdapter.MyViewHolder> {

    private Context context;

    public MyAdapter(Context context) {
        this.context = context;
    }

    @NonNull
    @Override
    public MyViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(context).inflate(R.layout.row_item, parent, false);
        return new MyViewHolder(view);
    }

    @Override
    public void onBindViewHolder(@NonNull MyViewHolder holder, int position) {
        holder.tvName.setText(String.format("Row number%d", position));
        if (position % 2 ==0){
            holder.imgBanner.setBackgroundColor(Color.RED);
        }else {
            holder.imgBanner.setBackgroundColor(Color.GREEN);
        }
    }

    @Override
    public int getItemCount() {
        return 15;
    }

    public class MyViewHolder extends RecyclerView.ViewHolder {
        TextView tvName;
        ImageView imgBanner;

        public MyViewHolder(@NonNull View itemView) {
            super(itemView);
            tvName = itemView.findViewById(R.id.tvName);
            imgBanner = itemView.findViewById(R.id.imgBanner);
        }
    }
}

row_item layout

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
             xmlns:tools="http://schemas.android.com/tools"
             android:layout_width="match_parent"
             android:layout_marginLeft="@dimen/pageMarginAndOffset"
             android:layout_marginRight="@dimen/pageMarginAndOffset"
             android:layout_height="match_parent"
             android:orientation="vertical">

    <ImageView
            android:id="@+id/imgBanner"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:background="@color/colorAccent"
            android:contentDescription="@string/app_name"/>

    <TextView
            android:id="@+id/tvName"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_gravity="center"
            android:gravity="center"
            android:layout_centerInParent="true"
            android:textColor="@android:color/white"
            android:textSize="20sp"
            android:textStyle="bold"
            tools:text="Hello"/>

</RelativeLayout>

OUTPUT

Solution 2

Using ViewPager2 (that has RecyclerView in it).

vp2 is instance of ViewPager2

This worked for me:

RecyclerView rv = (RecyclerView) vp2.getChildAt(0);
rv.setPadding(80, 0, 80, 0);
rv.setClipToPadding(false);

I used FragmentStateAdapter for it and overriding getItemId() and containsItem() for add/remove fragments.

result is here:

Comments

[Albert Vila Calvo]

Thanks for this! I've been trying to implement the carousel with ViewPager2 for a few hours with no success.

[Albert Vila Calvo]

I don't think that you need to set clipToPadding="false" on the ViewPager because it doesn't have any padding. Also, I don't think that you need clipChildren="false" either since you are not scaling any item more than 100% (ie. you're not drawing outside of the ViewPager). On your GitHub code nothing changes if I remove them. I'd suggest to remove this attributes if they are useless.

[AskNilesh]

@AlbertVilaCalvo okay i will remove that

[Albert Vila Calvo]

Another thing: you are setting offscreenPageLimit to 3. This means that there are 3 items retained on each side (total 6), even though you are only showing 1 extra item at each side. Unless you have the need to do so, you can lower this number to 2 or even 1 (everything keeps working fine).

[Danilo Lemes]

This code is related to ViewPager, OP is using ViewPager2

[Shubham AgaRwal]

somehow this is leaving empty blank space after some scrolling