Synchronized Scrolling RecyclerViewPager

Synchronized Scrolling RecyclerViewPager

import android.annotation.TargetApi;
import android.app.Activity;
import android.content.Context;
import android.content.res.Resources;
import android.os.Build;
import android.os.Bundle;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.util.DisplayMetrics;
import android.view.Display;
import android.view.MotionEvent;
import android.view.View;

import com.lsjwzh.widget.recyclerviewpager.RecyclerViewPager;

public class  SingleFlingPagerActivity extends Activity {

    private static final int LIST_ITEM_WIDTH = 210;
    private static final int LIST_2_ITEM_WIDTH = 70;
    private static final int LIST_ITEM_PADDING = 10;
    private static final float LIST_ITEM_TOTAL_WIDTH_RATIO =
            (float) (LIST_2_ITEM_WIDTH + 2 * LIST_ITEM_PADDING) / (float) (LIST_ITEM_WIDTH + 2 * LIST_ITEM_PADDING);

    protected RecyclerViewPager mRecyclerView;
    protected RecyclerViewPager mRecyclerView2;
    private boolean mIsListLeadScrool = true;
    private boolean mIsList2LeadScrool = false;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.demo_single_fling_pager);
        initViewPager();
        initViewPager2();
    }

    protected void initViewPager() {
        mRecyclerView = (RecyclerViewPager)findViewById(R.id.viewpager);
        LinearLayoutManager layout = new LinearLayoutManager(this, LinearLayoutManager.HORIZONTAL,
                false);
        mRecyclerView.setLayoutManager(layout);
        mRecyclerView.setAdapter(new LayoutAdapter(this, mRecyclerView));
        mRecyclerView.setHasFixedSize(true);
        Display display = getWindowManager().getDefaultDisplay();
        int screenWidth = display.getWidth();
        int listItemWidthInDp = LIST_ITEM_WIDTH;
        int listItemPaddingInDp = LIST_ITEM_PADDING;
        int padding = Math.round((screenWidth - convertDpToPixel(listItemWidthInDp + 2 * listItemPaddingInDp, this)) / 2);
        mRecyclerView.setPadding(padding, 0, padding, 0);
        mRecyclerView.setOnTouchListener(new View.OnTouchListener() {
            @Override
            public boolean onTouch(View v, MotionEvent event) {
                mIsListLeadScrool = true;
                mIsList2LeadScrool = false;
                mRecyclerView2.stopScroll();
                return false;
            }
        });
        mRecyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
            @Override
            public void onScrollStateChanged(RecyclerView recyclerView, int scrollState) {
            }

            @Override
            public void onScrolled(RecyclerView recyclerView, int i, int i2) {
                if (mIsListLeadScrool) {
                    mRecyclerView2.scrollBy(Math.round(LIST_ITEM_TOTAL_WIDTH_RATIO * i), Math.round(LIST_ITEM_TOTAL_WIDTH_RATIO * i2));
                }
            }
        });

        mRecyclerView.addOnLayoutChangeListener(new View.OnLayoutChangeListener() {
            @Override
            public void onLayoutChange(View v, int left, int top, int right, int bottom, int oldLeft, int oldTop, int oldRight, int oldBottom) {

            }
        });
    }

    protected void initViewPager2() {
        mRecyclerView2 = (RecyclerViewPager)findViewById(R.id.viewpager2);
        LinearLayoutManager layout = new LinearLayoutManager(this, LinearLayoutManager.HORIZONTAL,
                false);
        mRecyclerView2.setLayoutManager(layout);
        mRecyclerView2.setAdapter(new LayoutAdapter2(this, mRecyclerView2));
        mRecyclerView2.setHasFixedSize(true);
        Display display = getWindowManager().getDefaultDisplay();
        int screenWidth = display.getWidth();
        int listItemWidthInDp = LIST_2_ITEM_WIDTH;
        int listItemPaddingInDp = LIST_ITEM_PADDING;
        int padding = Math.round((screenWidth - convertDpToPixel(listItemWidthInDp + 2 * listItemPaddingInDp, this)) / 2);
        mRecyclerView2.setPadding(padding, 0, padding, 0);
        mRecyclerView2.setOnTouchListener(new View.OnTouchListener() {
            @Override
            public boolean onTouch(View v, MotionEvent event) {
                mIsList2LeadScrool = true;
                mIsListLeadScrool = false;
                mRecyclerView.stopScroll();
                return false;
            }
        });
        mRecyclerView2.addOnScrollListener(new RecyclerView.OnScrollListener() {
            @Override
            public void onScrollStateChanged(RecyclerView recyclerView, int scrollState) {
            }

            @TargetApi(Build.VERSION_CODES.ICE_CREAM_SANDWICH)
            @Override
            public void onScrolled(RecyclerView recyclerView, int i, int i2) {
                if (mIsList2LeadScrool) {
                    mRecyclerView.scrollBy(Math.round(i / LIST_ITEM_TOTAL_WIDTH_RATIO), Math.round(i2 / LIST_ITEM_TOTAL_WIDTH_RATIO));
                }
            }
        });
        mRecyclerView2.addOnPageChangedListener(new RecyclerViewPager.OnPageChangedListener() {
            @Override
            public void OnPageChanged(int oldPosition, int newPosition) {
            }
        });

        mRecyclerView2.addOnLayoutChangeListener(new View.OnLayoutChangeListener() {
            @Override
            public void onLayoutChange(View v, int left, int top, int right, int bottom, int oldLeft, int oldTop, int oldRight, int oldBottom) {
            }
        });
    }

    public static float convertDpToPixel(float dp, Context context){
        Resources resources = context.getResources();
        DisplayMetrics metrics = resources.getDisplayMetrics();
        float px = dp * (metrics.densityDpi / 160f);
        return px;
    }
}