由于中间这张图是刚截的，昨天刚刷了机...所以app的ico有点不一样
其实就是是精简了lanucher中WorkSpace的代码。。。有源码的同学可以自己看看源码....
主要原理：
覆盖onMeasure函数用于计算子view的高和宽
@Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { final int count = getChildCount(); //设置每个子视图的大小 for (int i = 0; i < count; i++) { getChildAt(i).measure(widthMeasureSpec, heightMeasureSpec); } }覆盖onLayout函数 用于设置子view的位置
其中childLeft += childWidth;使得每个子view从左到右依次排列
@Override protected void onLayout(boolean changed, int left, int top, int right, int bottom) { int childLeft = 0; final int count = getChildCount(); //设置每个视图的布局位置 for (int i = 0; i < count; i++) { final View child = getChildAt(i); if (child.getVisibility() != View.GONE) { final int childWidth = child.getMeasuredWidth(); child.layout(childLeft, 0, childLeft + childWidth, child.getMeasuredHeight()); childLeft += childWidth; } } }覆盖 onInterceptTouchEvent函数 关于这个函数的作用这篇文章解释的很清楚http://blog.csdn.net/ddna/article/details/5473293
简单点说此函数就是会终止TouchEvent函数的传递；
我们想要的效果是如果MotionEvent.ACTION_MOVE的方向是延x轴的时候要特殊处理
/** * This method JUST determines whether we want to intercept the motion. If we return true, onTouchEvent will be called * and we do the actual scrolling there. */ //it handle when down //return true intercept, //return false not intercept @Override public boolean onInterceptTouchEvent(MotionEvent ev) { /* * Shortcut the most recurring case: the user is in the dragging state and he is moving his finger. We want to * intercept this motion. */ final int action = ev.getAction(); if ((action == MotionEvent.ACTION_MOVE) && (mTouchState == TOUCH_INTERCEPT)) { return true; } final float x = ev.getX(); final float y = ev.getY(); switch (action) { case MotionEvent.ACTION_DOWN: // Remember location of down touch mLastMotionX = x; mLastMotionY = y; /* * If being flinged and user touches the screen, initiate drag; otherwise don't. mScroller.isFinished should be * false when being flinged. */ mTouchState = mScroller.isFinished() ? !TOUCH_INTERCEPT : TOUCH_INTERCEPT; break; case MotionEvent.ACTION_MOVE: /* * Locally do absolute value. mLastMotionX is set to the y value of the down event. */ final int xDiff = (int) Math.abs(x - mLastMotionX); final int yDiff = (int) Math.abs(y - mLastMotionY); boolean xMoved = xDiff > mTouchSlop; boolean yMoved = yDiff > mTouchSlop; if (xMoved || yMoved) { if (xMoved && !yMoved) { // Scroll if the user moved far enough along the X axis mTouchState = TOUCH_INTERCEPT; }else{ mTouchState = !TOUCH_INTERCEPT; } } break; case MotionEvent.ACTION_CANCEL: case MotionEvent.ACTION_UP: mTouchState = !TOUCH_INTERCEPT; break; }覆盖onTouchEvent函数达到移动x轴的时候 滚动视图代码有点长我就不贴了看demo把！主要就是精简了下workSpace里的代码 ... demo 地址http://d.download.csdn.net/down/3484431/li6a209
