高仿launcher和墨迹左右拖动效果

半个月前就有这样的想法，做出一个模仿launcher的效果。自己也曾从网上搜过很多资料，也思考过怎么实现，最终还是参考了别人的资料实现了此效果，也解决了我这半个多月的冥思苦想，再次感谢，今天把代码贴出来供大家学习，因为这方面做得比较好的资料缺失比较少（因为本人搜了很多资料都不能达到效果），如果大家觉得还不错，请顶起。

首先自定义一个 ViewGroup：

[html] public class MyScrollLayout extends ViewGroup{

    private VelocityTracker mVelocityTracker;           // 用于判断甩动手势
    private static final int SNAP_VELOCITY = 600;
    private Scroller mScroller;                        // 滑动控制器
    private int mCurScreen;
    private int mDefaultScreen = 0;
    private float mLastMotionX;
//   private int mTouchSlop;

   private OnViewChangeListener mOnViewChangeListener;

    public MyScrollLayout(Context context) {
        super(context);
        // TODO Auto-generated constructor stub
        init(context);
    }
    public MyScrollLayout(Context context, AttributeSet attrs) {
        super(context, attrs);
        // TODO Auto-generated constructor stub
        init(context);
    }

    public MyScrollLayout(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        // TODO Auto-generated constructor stub
        init(context);
    }

    private void init(Context context)
    {
        mCurScreen = mDefaultScreen;
     //   mTouchSlop = ViewConfiguration.get(getContext()).getScaledTouchSlop();
        mScroller = new Scroller(context);

    }

    @Override
    protected void onLayout(boolean changed, int l, int t, int r, int b) {
        // TODO Auto-generated method stub
         if (changed) {
                int childLeft = 0;
                final int childCount = getChildCount();
                for (int i=0; i<childCount; i++) {
                    final View childView = getChildAt(i);
                    if (childView.getVisibility() != View.GONE) {
                        final int childWidth = childView.getMeasuredWidth();
                        childView.layout(childLeft, 0,
                                childLeft+childWidth, childView.getMeasuredHeight());
                        childLeft += childWidth;
                    }
                }
            }
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        // TODO Auto-generated method stub
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
        final int width = MeasureSpec.getSize(widthMeasureSpec);
        final int widthMode = MeasureSpec.getMode(widthMeasureSpec);

        final int count = getChildCount();
        for (int i = 0; i < count; i++) {
            getChildAt(i).measure(widthMeasureSpec, heightMeasureSpec);
        }               &n

补充：移动开发 , Android ,