Implemented LoopRecyclerView with new AndroidX ViewPager2

circleindicator/src/main/java/me/relex/circleindicator/LoopCircleIndicator3.java

@@ -0,0 +1,40 @@
+package me.relex.circleindicator;
+
+import android.content.Context;
+import android.util.AttributeSet;
+
+public class LoopCircleIndicator3 extends CircleIndicator3 {
+
+	public LoopCircleIndicator3(Context context) {
+		super(context);
+	}
+
+	public LoopCircleIndicator3(Context context, AttributeSet attrs) {
+		super(context, attrs);
+	}
+
+	public LoopCircleIndicator3(Context context, AttributeSet attrs, int defStyleAttr) {
+		super(context, attrs, defStyleAttr);
+	}
+
+	public LoopCircleIndicator3(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
+		super(context, attrs, defStyleAttr, defStyleRes);
+	}
+
+	@Override
+	public void createIndicators(int count, int currentPosition) {
+		int realIndicatorsCount = count - 2;
+		if (realIndicatorsCount >= 0) {
+			super.createIndicators(realIndicatorsCount, currentPosition - 1);
+		} else {
+			super.createIndicators(count, currentPosition);
+		}
+	}
+
+	@Override
+	public void animatePageSelected(int position) {
+		if (mLastPosition > 0) mLastPosition -= 1;
+		super.animatePageSelected(position - 1);
+		mLastPosition = position;
+	}
+}

sample/src/main/java/me/relex/circleindicator/sample/LoopRecycler2Adapter.java

@@ -0,0 +1,52 @@
+package me.relex.circleindicator.sample;
+
+import android.widget.TextView;
+
+import androidx.annotation.NonNull;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Random;
+
+public class LoopRecycler2Adapter extends SampleRecyclerAdapter {
+
+	private List<Integer> colors = new ArrayList();
+	private final Random random = new Random();
+
+	public LoopRecycler2Adapter(int count) {
+		super(count);
+		for (int i = 0; i < count; i++) {
+			colors.add(0xff000000 | random.nextInt(0x00ffffff));
+		}
+
+		if (colors.size() > 0) {
+			Integer firstColor = colors.get(0);
+			Integer lastColor = colors.get(colors.size() - 1);
+
+			colors.add(0, lastColor);
+			colors.add(colors.size(), firstColor);
+		}
+	}
+
+	@Override
+	public void onBindViewHolder(@NonNull TextViewHolder holder, int position) {
+		TextView textView = (TextView) holder.itemView;
+		textView.setText(String.valueOf(getLoopPosition(position)));
+		textView.setBackgroundColor(colors.get(position));
+	}
+
+	@Override
+	public int getItemCount() {
+		return colors.size();
+	}
+
+	private int getLoopPosition(int position) {
+		if (position == 0) {
+			return colors.size() - 2;
+		} else if (position == colors.size() - 1) {
+			return 1;
+		} else {
+			return position;
+		}
+	}
+}

sample/src/main/java/me/relex/circleindicator/sample/SampleActivity.java

@@ -21,6 +21,7 @@
 import me.relex.circleindicator.sample.fragment.DefaultFragment;
 import me.relex.circleindicator.sample.fragment.DynamicAdapterFragment;
 import me.relex.circleindicator.sample.fragment.LoopRecyclerViewFragment;
+import me.relex.circleindicator.sample.fragment.LoopViewPager2Fragment;
 import me.relex.circleindicator.sample.fragment.LoopViewPagerFragment;
 import me.relex.circleindicator.sample.fragment.RecyclerViewFragment;
 import me.relex.circleindicator.sample.fragment.ResetAdapterFragment;
@@ -89,6 +90,8 @@ public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceStat
                     LoopRecyclerViewFragment.class.getName()));
             adapter.add(new SampleInfo("AndroidX ViewPager2 (CircleIndicator3)",
                     ViewPager2Fragment.class.getName()));
+            adapter.add(new SampleInfo("AndroidX LoopViewPager2 (CircleIndicator3)",
+                LoopViewPager2Fragment.class.getName()));
         }
 
         private class SampleListAdapter extends RecyclerView.Adapter<ItemViewHolder> {

sample/src/main/java/me/relex/circleindicator/sample/fragment/LoopViewPager2Fragment.java

@@ -0,0 +1,75 @@
+package me.relex.circleindicator.sample.fragment;
+
+import android.os.Bundle;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+import androidx.fragment.app.Fragment;
+import androidx.viewpager2.widget.ViewPager2;
+
+import me.relex.circleindicator.LoopCircleIndicator3;
+import me.relex.circleindicator.sample.LoopRecycler2Adapter;
+import me.relex.circleindicator.sample.R;
+
+public class LoopViewPager2Fragment extends Fragment {
+
+	private LoopRecycler2Adapter mAdapter;
+	private ViewPager2 mViewPager;
+	private LoopCircleIndicator3 mIndicator;
+
+	@Nullable
+	@Override
+	public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container,
+	                         @Nullable Bundle savedInstanceState) {
+		return inflater.inflate(R.layout.fragment_sample_loop_viewpager2, container, false);
+	}
+
+	@Override
+	public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
+		mAdapter = new LoopRecycler2Adapter(3);
+
+		mIndicator = view.findViewById(R.id.indicator);
+		mViewPager = view.findViewById(R.id.viewpager);
+
+		mViewPager.setAdapter(mAdapter);
+		mViewPager.setCurrentItem(1, false);
+
+		mAdapter.registerAdapterDataObserver(mIndicator.getAdapterDataObserver());
+
+		mIndicator.setViewPager(mViewPager);
+		mViewPager.registerOnPageChangeCallback(new ViewPager2.OnPageChangeCallback() {
+			@Override
+			public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
+				if (positionOffsetPixels == 0) {
+					if (position == mAdapter.getItemCount() - 1) {
+						mViewPager.setCurrentItem(1, false);
+					}
+
+					if (position == 0 && mAdapter.getItemCount() > 2) {
+						mViewPager.setCurrentItem(mAdapter.getItemCount() - 2, false);
+					}
+				}
+			}
+
+			@Override
+			public void onPageSelected(int position) {
+				if (position == mAdapter.getItemCount() - 1) {
+					mIndicator.animatePageSelected(1);
+				}
+
+				if (position == 0 && mAdapter.getItemCount() > 2) {
+					mIndicator.animatePageSelected(mAdapter.getItemCount() - 2);
+				}
+			}
+		});
+	}
+
+	@Override
+	public void onDestroyView() {
+		mAdapter.unregisterAdapterDataObserver(mIndicator.getAdapterDataObserver());
+		super.onDestroyView();
+	}
+}

sample/src/main/res/layout/fragment_sample_loop_viewpager2.xml

@@ -0,0 +1,18 @@
+<?xml version="1.0" encoding="utf-8"?>
+<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent">
+
+    <androidx.viewpager2.widget.ViewPager2
+        android:id="@id/viewpager"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"/>
+
+    <me.relex.circleindicator.LoopCircleIndicator3
+        android:id="@id/indicator"
+        android:layout_width="match_parent"
+        android:layout_height="48dp"
+        android:layout_gravity="bottom"
+        android:layout_marginBottom="48dp"/>
+
+</FrameLayout>