fix bug:loopviewpager position confusion

Author: lsjwzh

app/build.gradle

@@ -33,8 +33,8 @@ dependencies {
     compile fileTree(dir: 'libs', include: ['*.jar'])
     compile project(':lib')
     compile project(':tablayoutsupport')
-    compile 'com.android.support:appcompat-v7:22.2.1'
-    compile 'com.android.support:design:22.2.1'
+    compile 'com.android.support:appcompat-v7:23.3.0'
+    compile 'com.android.support:design:23.3.0'
 
     compile 'com.github.bumptech.glide:glide:3.6.0'
     compile 'de.hdodenhof:circleimageview:1.3.0'

lib/src/main/java/com/lsjwzh/widget/recyclerviewpager/LoopRecyclerViewPager.java

@@ -3,6 +3,7 @@
 import android.content.Context;
 import android.support.annotation.NonNull;
 import android.util.AttributeSet;
+import android.util.Log;
 
 public class LoopRecyclerViewPager extends RecyclerViewPager {
 
@@ -47,7 +48,9 @@ protected RecyclerViewPagerAdapter ensureRecyclerViewPagerAdapter(Adapter adapte
      */
     @Override
     public void smoothScrollToPosition(int position) {
-        super.smoothScrollToPosition(transformInnerPositionIfNeed(position));
+        int transformedPosition = transformInnerPositionIfNeed(position);
+        super.smoothScrollToPosition(transformedPosition);
+        Log.e("test", "transformedPosition:" + transformedPosition);
     }
 
     /**
@@ -76,15 +79,15 @@ public int getActualCurrentPosition() {
      * @return actual position
      */
     public int transformToActualPosition(int position) {
-        return position % getActualItemCountFromAdpater();
+        return position % getActualItemCountFromAdapter();
     }
 
-    private int getActualItemCountFromAdpater() {
+    private int getActualItemCountFromAdapter() {
         return ((LoopRecyclerViewPagerAdapter) getWrapperAdapter()).getActualItemCount();
     }
 
     private int transformInnerPositionIfNeed(int position) {
-        final int actualItemCount = getActualItemCountFromAdpater();
+        final int actualItemCount = getActualItemCountFromAdapter();
         final int actualCurrentPosition = getCurrentPosition() % actualItemCount;
         int bakPosition1 = getCurrentPosition()
                 - actualCurrentPosition
@@ -97,6 +100,7 @@ private int transformInnerPositionIfNeed(int position) {
                 - actualCurrentPosition
                 + actualItemCount
                 + position % actualItemCount;
+        Log.e("test", bakPosition1 + "/" + bakPosition2 + "/" + bakPosition3 + "/" + getCurrentPosition());
         // get position which is closer to current position
         if (Math.abs(bakPosition1 - getCurrentPosition()) > Math.abs(bakPosition2 -
                 getCurrentPosition())){
@@ -118,7 +122,7 @@ private int transformInnerPositionIfNeed(int position) {
 
     private int getMiddlePosition() {
         int middlePosition = Integer.MAX_VALUE / 2;
-        final int actualItemCount = getActualItemCountFromAdpater();
+        final int actualItemCount = getActualItemCountFromAdapter();
         if (actualItemCount > 0 && middlePosition % actualItemCount != 0) {
             middlePosition = middlePosition - middlePosition % actualItemCount;
         }

lib/src/main/java/com/lsjwzh/widget/recyclerviewpager/LoopRecyclerViewPagerAdapter.java

@@ -2,9 +2,13 @@
 
 import android.support.v7.widget.RecyclerView;
 
+import java.lang.reflect.Field;
+
 public class LoopRecyclerViewPagerAdapter<VH extends RecyclerView.ViewHolder>
         extends RecyclerViewPagerAdapter<VH> {
 
+    private Field mPositionField;
+
     public LoopRecyclerViewPagerAdapter(RecyclerViewPager viewPager, RecyclerView.Adapter<VH> adapter) {
         super(viewPager, adapter);
     }
@@ -39,6 +43,21 @@ public long getItemId(int position) {
     @Override
     public void onBindViewHolder(VH holder, int position) {
         super.onBindViewHolder(holder, getActualPosition(position));
+        // because of getCurrentPosition may return ViewHolder‘s position,
+        // so we must reset mPosition.
+        if (mPositionField == null) {
+            try {
+                mPositionField = holder.getClass().getDeclaredField("mPosition");
+                mPositionField.setAccessible(true);
+            } catch (NoSuchFieldException e) {
+                e.printStackTrace();
+            }
+        }
+        try {
+            mPositionField.set(holder, position);;
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
     }
 
     public int getActualPosition(int position) {

tablayoutsupport/src/main/java/com/lsjwzh/widget/recyclerviewpager/TabLayoutSupport.java

@@ -90,10 +90,14 @@ public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
             final float positionOffset = offset * 1f / pagerWidth;
             if (tabLayout != null) {
                 if (positionOffset < 0) {
-                    tabLayout.setScrollPosition(mPositionBeforeScroll
-                                    + (int) Math.floor(positionOffset),
+                    try {
+                        tabLayout.setScrollPosition(mPositionBeforeScroll
+                                + (int) Math.floor(positionOffset),
                             positionOffset - (int) Math.floor(positionOffset),
                             false);
+                    } catch (Throwable e) {
+                        e.printStackTrace();
+                    }
                 } else {
                     tabLayout.setScrollPosition(mPositionBeforeScroll + (int) (positionOffset),
                             positionOffset - (int) (positionOffset),