Android两条并排RecyclerView实时联动滑动增强

Android两条并排RecyclerView实时联动滑动增强

在附录1中，我初步实现了两条垂直摆放的RecyclerView的实时联动滚动，但是附录文章1的实现存在一定问题，比如当用户的手指同时在屏幕的两条RecyclerView区域内滑动，将发生异常。还有就是，比如在RecyclerView1正在滚动时候，用户又在RecyclerView2的区域内手指滑动，这样将触发循环嵌套滚动事件，引发错误，因此本文在附录1的基础上改进，通过拦截处理系统的触摸事件解决造成RecyclerView滚动引发的问题。
代码：

package zhangphil.test;import android.graphics.Color;import android.os.Bundle;import android.support.annotation.NonNull;import android.support.annotation.Nullable;import android.support.v7.app.AppCompatActivity;import android.support.v7.widget.LinearLayoutManager;import android.support.v7.widget.RecyclerView;import android.support.v7.widget.StaggeredGridLayoutManager;import android.view.LayoutInflater;import android.view.MotionEvent;import android.view.View;import android.view.ViewGroup;import android.widget.TextView;import java.util.ArrayList;public class RVActivity extends AppCompatActivity {    private RecyclerView mRecyclerView1;    private RecyclerView mRecyclerView2;    private ArrayList mItems;    /**     * 返回true，表示拦截事件。     * 返回false，表示不做任何处理，交给子View处理。     *     * @param event     * @return     */    @Override    public boolean dispatchTouchEvent(MotionEvent event) {        /**         * 如果用户的手指同时放在屏幕上滑动，不要触发滚动事件。         *         */        if (event.getPointerCount() >= 2) {            return true;        }        /**         * 如果左侧的RecyclerView1在滚动中，但是此时用户又在RecyclerView2中触发滚动事件，则停止所有滚动，等待新一轮滚动。         *         */        if (mRecyclerView1.getScrollState() != RecyclerView.SCROLL_STATE_IDLE) {            if (touchEventInView(mRecyclerView2, event.getX(), event.getY())) {                mRecyclerView1.stopScroll();                mRecyclerView2.stopScroll();                return true;            }        }        /**         * 如果右侧的RecyclerView2在滚动中，但是此时用户又在RecyclerView1中触发滚动事件，则停止所有滚动，等待新一轮滚动。         *         */        if (mRecyclerView2.getScrollState() != RecyclerView.SCROLL_STATE_IDLE) {            if (touchEventInView(mRecyclerView1, event.getX(), event.getY())) {                mRecyclerView2.stopScroll();                mRecyclerView1.stopScroll();                return true;            }        }        return super.dispatchTouchEvent(event);    }    private boolean touchEventInView(View view, float x, float y) {        if (view == null) {            return false;        }        int[] location = new int[2];        view.getLocationOnScreen(location);        int left = location[0];        int top = location[1];        int right = left + view.getMeasuredWidth();        int bottom = top + view.getMeasuredHeight();        if (y >= top && y <= bottom && x >= left && x <= right) {            return true;        }        return false;    }    @Override    protected void onCreate(@Nullable Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.rv_activity);        mItems = new ArrayList<>();        for (int i = 0; i < 10000; i++) {            mItems.add(i);        }        initRecyclerView1();        initRecyclerView2();        mRecyclerView1.addOnScrollListener(new RecyclerView.OnScrollListener() {            @Override            public void onScrolled(RecyclerView recyclerView, int dx, int dy) {                if (recyclerView.getScrollState() != RecyclerView.SCROLL_STATE_IDLE) {                    mRecyclerView2.scrollBy(dx, dy);                }            }        });        mRecyclerView2.addOnScrollListener(new RecyclerView.OnScrollListener() {            @Override            public void onScrolled(RecyclerView recyclerView, int dx, int dy) {                if (recyclerView.getScrollState() != RecyclerView.SCROLL_STATE_IDLE) {                    mRecyclerView1.scrollBy(dx, dy);                }            }        });    }    private void initRecyclerView1() {        mRecyclerView1 = findViewById(R.id.recycler_view_1);        LinearLayoutManager layoutManager = new LinearLayoutManager(this);        layoutManager.setOrientation(LinearLayoutManager.VERTICAL);        mRecyclerView1.setLayoutManager(layoutManager);        RecyclerViewAdapter mAdapter = new RecyclerViewAdapter(1);        mRecyclerView1.setAdapter(mAdapter);    }    private void initRecyclerView2() {        mRecyclerView2 = findViewById(R.id.recycler_view_2);        StaggeredGridLayoutManager layoutManager = new StaggeredGridLayoutManager(12, StaggeredGridLayoutManager.VERTICAL);        layoutManager.setOrientation(LinearLayoutManager.VERTICAL);        mRecyclerView2.setLayoutManager(layoutManager);        RecyclerViewAdapter mAdapter = new RecyclerViewAdapter(2);        mRecyclerView2.setAdapter(mAdapter);    }    private class RecyclerViewAdapter extends RecyclerView.Adapter {        private int id;        public RecyclerViewAdapter(int id) {            this.id = id;        }        @NonNull        @Override        public MyVH onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {            View view = LayoutInflater.from(getApplicationContext()).inflate(R.layout.rv_item, parent, false);            return new MyVH(view);        }        @Override        public void onBindViewHolder(@NonNull MyVH holder, int position) {            holder.text1.setText("RecyclerView:" + id);            holder.text2.setText(mItems.get(position) + "");            switch (id) {                case 1:                    holder.text1.setBackgroundColor(Color.RED);                    break;                case 2:                    holder.text1.setBackgroundColor(Color.BLUE);                    break;            }        }        @Override        public int getItemCount() {            return mItems.size();        }    }    private class MyVH extends RecyclerView.ViewHolder {        public TextView text1;        public TextView text2;        public MyVH(View itemView) {            super(itemView);            text1 = itemView.findViewById(R.id.text1);            text1.setTextColor(Color.WHITE);            text2 = itemView.findViewById(R.id.text2);            text2.setTextColor(Color.DKGRAY);        }    }}

相应布局文件：

<?xml version="1.0" encoding="utf-8"?>

附录：
1，《Android若干条并排RecyclerView滑动实时联动》链接：https://blog.csdn.net/zhangphil/article/details/79925803
2，《 Android dispatchTouchEvent检测多点触摸事件是否落入在某一个View区域内》链接：https://blog.csdn.net/zhangphil/article/details/80067150

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