為了能夠在ViewPager的第一頁和最後一頁左右滑動時候不顯得那麼生硬，通過重寫ViewPager類實現回彈效果。
程式碼很簡單，主要重寫onTouchEvent方法。
程式碼如下：

public class BounceBackViewPager extends ViewPager {

    private int currentPosition = 0;
    private Rect mRect = new Rect();//用來記錄初始位置
    private boolean handleDefault = true;
    private float preX = 0
 
f;
    private static final float RATIO = 0.5f;//摩擦係數
    private static final float SCROLL_WIDTH = 10f;

    public BounceBackViewPager(Context context) {
        super(context);
    }

    public BounceBackViewPager(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    @Override
 

    public boolean dispatchKeyEvent(KeyEvent event) {
        return super.dispatchKeyEvent(event);
    }

    @Override
    public boolean onInterceptTouchEvent(MotionEvent ev) {
        if (ev.getAction() == MotionEvent.ACTION_DOWN) {
            preX = ev.getX();//記錄起點
            currentPosition = getCurrentItem();
        }
        return
 
 super.onInterceptTouchEvent(ev);
    }

    @Override
    public boolean onTouchEvent(MotionEvent ev) {
        switch (ev.getAction()) {
            case MotionEvent.ACTION_UP:
                onTouchActionUp();
                break;
            case MotionEvent.ACTION_MOVE:
                if (getAdapter().getCount() == 1) {
                    float nowX = ev.getX();
                    float offset = nowX - preX;
                    preX = nowX;

                    if (offset > SCROLL_WIDTH) {//手指滑動的距離大於設定值
                        whetherConditionIsRight(offset);
                    } else if (offset < -SCROLL_WIDTH) {
                        whetherConditionIsRight(offset);
                    } else if (!handleDefault) {//這種情況是已經出現緩衝區域了，手指慢慢恢復的情況
                        if (getLeft() + (int) (offset * RATIO) != mRect.left) {
                            layout(getLeft() + (int) (offset * RATIO), getTop(), getRight() + (int) (offset * RATIO), getBottom());
                        }
                    }
                } else if ((currentPosition == 0 || currentPosition == getAdapter().getCount() - 1)) {
                    float nowX = ev.getX();
                    float offset = nowX - preX;
                    preX = nowX;

                    if (currentPosition == 0) {
                        if (offset > SCROLL_WIDTH) {//手指滑動的距離大於設定值
                            whetherConditionIsRight(offset);
                        } else if (!handleDefault) {//這種情況是已經出現緩衝區域了，手指慢慢恢復的情況
                            if (getLeft() + (int) (offset * RATIO) >= mRect.left) {
                                layout(getLeft() + (int) (offset * RATIO), getTop(), getRight() + (int) (offset * RATIO), getBottom());
                            }
                        }
                    } else {
                        if (offset < -SCROLL_WIDTH) {
                            whetherConditionIsRight(offset);
                        } else if (!handleDefault) {
                            if (getRight() + (int) (offset * RATIO) <= mRect.right) {
                                layout(getLeft() + (int) (offset * RATIO), getTop(), getRight() + (int) (offset * RATIO), getBottom());
                            }
                        }
                    }
                } else {
                    handleDefault = true;
                }

                if (!handleDefault) {
                    return true;
                }
                break;

            default:
                break;
        }
        return super.onTouchEvent(ev);
    }

    private void whetherConditionIsRight(float offset) {
        if (mRect.isEmpty()) {
            mRect.set(getLeft(), getTop(), getRight(), getBottom());
        }
        handleDefault = false;
        layout(getLeft() + (int) (offset * RATIO), getTop(), getRight() + (int) (offset * RATIO), getBottom());
    }

    private void onTouchActionUp() {
        if (!mRect.isEmpty()) {
            recoveryPosition();
        }
    }

    private void recoveryPosition() {
        TranslateAnimation ta = new TranslateAnimation(getLeft(), mRect.left, 0, 0);
        ta.setDuration(300);
        startAnimation(ta);
        layout(mRect.left, mRect.top, mRect.right, mRect.bottom);
        mRect.setEmpty();
        handleDefault = true;
    }

}