首先我們的RecyclerView的根佈局是LinearLayout，所以這裡用的是LinearLayout.LayoutParams，如果是其他佈局，就用相應的LayoutParams。
首先是設定的程式碼：

        recyclerView.setLayoutParams(new LinearLayout.LayoutParams(
                LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.MATCH_PARENT));

對RecyclerView的監聽事件：oldY 是全域性的

        final ValueAnimator valueAnimator = ValueAnimator.ofInt(100, 0);
        recyclerView.setOnTouchListener(new View.OnTouchListener() {
            @Override
            public boolean onTouch(View view, MotionEvent motionEvent) {
                switch (motionEvent.getActionMasked()) {
                    case
 
 MotionEvent.ACTION_DOWN:
                        oldY = (int) motionEvent.getY();
                        break;
                    case MotionEvent.ACTION_MOVE:
                        int newY = (int) motionEvent.getY();
                        if (newY - oldY > 3) {
                            LinearLayout.LayoutParams lp =
                                    (LinearLayout.LayoutParams) recyclerView.getLayoutParams();
                            lp.topMargin += newY - oldY;
                            recyclerView.setLayoutParams(lp);
                            recyclerView.requestLayout();
                            oldY = newY;
                        }
                        break
 
;
                    case MotionEvent.ACTION_UP:
                        final LinearLayout.LayoutParams lp =
                                (LinearLayout.LayoutParams) recyclerView.getLayoutParams();
                        valueAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
                            private IntEvaluator evaluator = new IntEvaluator();

                            @Override
                            public void onAnimationUpdate(ValueAnimator valueAnimator) {
                                lp.topMargin = evaluator.evaluate(
                                        valueAnimator.getAnimatedFraction(), lp.topMargin, 0);
                                recyclerView.setLayoutParams(lp);
                                recyclerView.requestLayout();
                            }
                        });
                        valueAnimator.start();
                        break;
                }
                return false;
            }
        });

本文完。