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));
}
}
}
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