Android 爲TV端助力之解決ViewPager嵌套RecyclerView水平滑動問題

public class MyViewPager extends ViewPager {
    private RecyclerView recyclerView;
    public MyViewPager(@NonNull Context context) {
        super(context);
    }

    public MyViewPager(@NonNull Context context, @Nullable AttributeSet attrs) {
        super(context, attrs);
    }

   public void setView(RecyclerView recyclerView){
        this.recyclerView = recyclerView;
   }



    private int startX, startY;
    @Override
    public boolean onInterceptTouchEvent(MotionEvent ev) {
        if(null != recyclerView){
            switch (ev.getAction()) {
                case MotionEvent.ACTION_DOWN:
                    startX = (int) ev.getX();
                    startY = (int) ev.getY();
                    getParent().requestDisallowInterceptTouchEvent(true);
                    break;
                case MotionEvent.ACTION_MOVE:
                    int endX = (int) ev.getX();
                 //第一種方法
//                    int endY = (int) ev.getY();
//                    int disX = Math.abs(endX - startX);
//                    int disY = Math.abs(endY - startY);
//                    if(disX > disY){
//                        getParent().requestDisallowInterceptTouchEvent(canScrollHorizontally(startX -endX));
//                    }else {
//                        getParent().requestDisallowInterceptTouchEvent(canScrollVertically(startY -endY));
//                    }
                    
                    //第二種方法
                    if(endX>startX){ //表示向左滑動
                        isVisTop(recyclerView);
                    }else if(endX<startX){//向右滑動
                        isVisBottom(recyclerView);
                    }
                    break;
                case MotionEvent.ACTION_UP:
                case MotionEvent.ACTION_CANCEL:
                    getParent().requestDisallowInterceptTouchEvent(false);
                    break;
            }
            return super.onInterceptTouchEvent(ev);
        }else{
            return super.onInterceptTouchEvent(ev);
        }
    }

    public static boolean isVisBottom(RecyclerView recyclerView){
        LinearLayoutManager layoutManager = (LinearLayoutManager) recyclerView.getLayoutManager();
        //屏幕中最後一個可見子項的position
        int lastVisibleItemPosition = layoutManager.findLastVisibleItemPosition();
        //當前屏幕所看到的子項個數
        int visibleItemCount = layoutManager.getChildCount();
        //當前RecyclerView的全部子項個數
        int totalItemCount = layoutManager.getItemCount();
        //RecyclerView的滑動狀態
        int state = recyclerView.getScrollState();
        if(visibleItemCount > 0 && lastVisibleItemPosition == totalItemCount - 1 ){
            return true;
        }else {
            return false;
        }
    }
    public static boolean isVisTop(RecyclerView recyclerView){
        LinearLayoutManager layoutManager = (LinearLayoutManager) recyclerView.getLayoutManager();
        //屏幕中最後一個可見子項的position
        int lastVisibleItemPosition = layoutManager.findLastVisibleItemPosition();
        //當前屏幕所看到的子項個數
        int visibleItemCount = layoutManager.getChildCount();
        //當前RecyclerView的全部子項個數
        int totalItemCount = layoutManager.getItemCount();
        //RecyclerView的滑動狀態
        int state = recyclerView.getScrollState();
        if(visibleItemCount > 0 && lastVisibleItemPosition <visibleItemCount){
            return true;
        }else {
            return false;
        }
    }
}

從新viewPager攔截器onInterceptTouchEvent方法，如上面所示，滑動最左邊或者最右邊的時候就返回true攔截監聽，交給viewPager本身處理，若是不是那就返回false，向下傳遞