12.View的滑动

/**
     * Set the scrolled position of your view. This will cause a call to
     * {@link #onScrollChanged(int, int, int, int)} and the view will be
     * invalidated.
     * @param x the x position to scroll to
     * @param y the y position to scroll to
     */
    public void scrollTo(int x, int y) {
        if (mScrollX != x || mScrollY != y) {
            int oldX = mScrollX;
            int oldY = mScrollY;
            mScrollX = x;
            mScrollY = y;
            //用于通知父控件需要清空这个View的缓存
            invalidateParentCaches();
            onScrollChanged(mScrollX, mScrollY, oldX, oldY);
            
            if (!awakenScrollBars()) {
                postInvalidateOnAnimation();
            }
        }
    }

    /**
     * Move the scrolled position of your view. This will cause a call to
     * {@link #onScrollChanged(int, int, int, int)} and the view will be
     * invalidated.
     * @param x the amount of pixels to scroll by horizontally
     * @param y the amount of pixels to scroll by vertically
     */
    public void scrollBy(int x, int y) {
        scrollTo(mScrollX + x, mScrollY + y);
    }

 <?xml version="1.0" encoding="utf-8"?>
     <set xmlns:android="http://schemas.android.com/apk/res/android"
            android:fillAfter="true"
            android:zAdjustment="normal">
            <translate
                android:duration="100"
                android:fromXDelta="0"
                android:formXDelta="0"
                android:interpolator="@android:anim/linear_interpolator"
                android:toXDelta="100"
                android:toYDelta="100"   />    
    </set>