滑动，与用户直观交互

任何app无论功能的多少，最终都会落实到与用户交互上，在这里咱们就一起去看看与用户交互最深切感受的滑动。
滑动无非就是view自己在parent中的移动，再者就是parent移动（view形式上的滑动，其实只是隐形的欺骗了一下用户的眼睛）。这里谈到友好交互，就不再大批量的文字让你看的作呕。
一：view自己滑动
1.设置margin

public class LayoutParamsSSS extends LinearLayout {    public LayoutParamsSSS(Context context) {        this(context, null, 0);    }    public LayoutParamsSSS(Context context, AttributeSet attrs) {        this(context, attrs, 0);    }    public LayoutParamsSSS(Context context, AttributeSet attrs, int defStyleAttr) {        super(context, attrs, defStyleAttr);    }    @Override    protected void onLayout(boolean changed, int l, int t, int r, int b) {        super.onLayout(changed,l,t,r,b);    }    private int lastX;    private int lastY;    @Override    public boolean onTouchEvent(MotionEvent event) {        int rawX = (int) event.getRawX();        int rawY = (int) event.getRawY();        switch (event.getAction()){            case MotionEvent.ACTION_DOWN:                //记录触摸点坐标                lastX = rawX;                lastY = rawY;                break;            case MotionEvent.ACTION_MOVE:                //计算偏移量                int offsetX = rawX - lastX;                int offsetY = rawY - lastY;                //设置它的LayoutParams（这里用了一个巧方式，因为任何ViewGroup都有MarginLayoutParams）                ViewGroup.MarginLayoutParams layoutParams = (MarginLayoutParams) getLayoutParams();                layoutParams.leftMargin = getLeft() + offsetX;                layoutParams.topMargin = getTop() + offsetY;//                setLayoutParams(layoutParams);//和requestLayout()方法一样                requestLayout();                //重新设置初始坐标                lastX = rawX;                lastY = rawY;                break;        }        return super.onTouchEvent(event);    }}

2.设置layout

//在当前left、top、right、bottom的基础上加上偏移量 layout(getLeft()+offsetX,getTop()+offsetY,getRight()+offsetX,getBottom() + offsetY);

3.设置View所在矩阵Rect

//设置X和Y上的偏移量                offsetLeftAndRight(offsetX);                offsetTopAndBottom(offsetY);

4.使用属性动画

public class AnimatorSSS extends View {    private Scroller mScroller;    public AnimatorSSS(Context context) {        this(context, null, 0);    }    public AnimatorSSS(Context context, AttributeSet attrs) {        this(context, attrs, 0);    }    public AnimatorSSS(Context context, AttributeSet attrs, int defStyleAttr) {        super(context, attrs, defStyleAttr);        mScroller = new Scroller(context, new BounceInterpolator());    }    private float lastX = 0;    private float lastY = 0;    @Override    public boolean onTouchEvent(MotionEvent event) {        float firstX = event.getRawX();        float firstY = event.getRawY();        switch (event.getAction()) {            case MotionEvent.ACTION_DOWN:                break;            case MotionEvent.ACTION_MOVE:                ViewHelper.setTranslationX(this, ViewHelper.getTranslationX(this) + firstX - lastX);                ViewHelper.setTranslationY(this, ViewHelper.getTranslationY(this) + firstY - lastY);                break;            case MotionEvent.ACTION_UP:                smoothScrollTo(100, 100);                break;            default:                break;        }        lastX = firstX;        lastY = firstY;        return super.onTouchEvent(event);    }    private int lastTranslationX = 0;    private int lastTranslationY = 0;    private void smoothScrollTo(int desX, int desY) {        mScroller.startScroll(lastTranslationX - desX, lastTranslationY - desY, (int) ViewHelper                .getTranslationX(this) - lastTranslationX, (int) ViewHelper.getTranslationY(this) -                lastTranslationY);        lastTranslationX = (int) ViewHelper.getTranslationX(this);        lastTranslationY = (int) ViewHelper.getTranslationY(this);        invalidate();    }    @Override    public void computeScroll() {        super.computeScroll();        if (mScroller.computeScrollOffset()) {            ((View) getParent()).scrollTo(mScroller.getCurrX(), mScroller.getCurrY());            postInvalidate();        }    }}

二：parent移动
1.scrollTo和scrollBy

public class ScrollBySSS extends LinearLayout {    public ScrollBySSS(Context context) {        this(context, null, 0);    }    public ScrollBySSS(Context context, AttributeSet attrs) {        this(context, attrs, 0);    }    public ScrollBySSS(Context context, AttributeSet attrs, int defStyleAttr) {        super(context, attrs, defStyleAttr);    }    @Override    protected void onLayout(boolean changed, int l, int t, int r, int b) {        super.onLayout(changed,l,t,r,b);        ((View)getParent()).getLocationOnScreen(mm);    }    private int[] mm = new int[2];//    private int lastX;//    private int lastY;    @Override    public boolean onTouchEvent(MotionEvent event) {        int rawX = (int) event.getRawX();        int rawY = (int) event.getRawY();        switch (event.getAction()){            case MotionEvent.ACTION_DOWN:                //记录触摸点坐标//                lastX = rawX;//                lastY = rawY;                break;            case MotionEvent.ACTION_MOVE:                //计算偏移量//                int offsetX = rawX - lastX;//                int offsetY = rawY - lastY;                //设置它的LayoutParams（这里用了一个巧方式，因为任何ViewGroup都有MarginLayoutParams）//                ((View)getParent()).scrollBy(-offsetX,-offsetY);                ((View)getParent()).scrollTo(-rawX + mm[0], -rawY + mm[1]);                //重新设置初始坐标//                lastX = rawX;//                lastY = rawY;                break;        }        return super.onTouchEvent(event);    }}

2.scroller类

public class ScrollerSSS extends LinearLayout {    private Scroller mScroller;    public ScrollerSSS(Context context) {        this(context, null, 0);    }    public ScrollerSSS(Context context, AttributeSet attrs) {        this(context, attrs, 0);    }    public ScrollerSSS(Context context, AttributeSet attrs, int defStyleAttr) {        super(context, attrs, defStyleAttr);        mScroller = new Scroller(context,new BounceInterpolator());    }    @Override    protected void onLayout(boolean changed, int l, int t, int r, int b) {        super.onLayout(changed, l, t, r, b);    }    private int lastX;    private int lastY;    @Override    public boolean onTouchEvent(MotionEvent event) {        int rawX = (int) event.getRawX();        int rawY = (int) event.getRawY();        switch (event.getAction()){            case MotionEvent.ACTION_DOWN:                //记录触摸点坐标                lastX = rawX;                lastY = rawY;                break;            case MotionEvent.ACTION_MOVE:                //计算偏移量                int offsetX = rawX - lastX;                int offsetY = rawY - lastY;                ((View)getParent()).scrollBy(-offsetX,-offsetY);                //重新设置初始坐标                lastX = rawX;                lastY = rawY;                break;            case MotionEvent.ACTION_UP:                //手指离开，回弹                View parent = (View) getParent();                mScroller.startScroll(parent.getScrollX(),parent.getScrollY(),-parent.getScrollX(),-parent.getScrollY(),1000);                invalidate();                break;        }        return super.onTouchEvent(event);    }    @Override    public void computeScroll() {        super.computeScroll();        //判断Scroller是否执行完毕        if (mScroller.computeScrollOffset()){            ((View)getParent()).scrollTo(mScroller.getCurrX(),mScroller.getCurrY());            //通过重绘来不断调用computeScroll            invalidate();        }    }}

ok了，暂时就这么多，坐标还真难调！！！！！！！！！！