最近看了hyman的博客：,由于个人技术还比较薄弱，就在这个自定义控件的基础上做了个拓展，支持水平和垂直的
下面是主要代码;
GuideView:
import android.annotation.SuppressLint;import android.content.Context;import android.content.res.TypedArray;import android.graphics.Point;import android.graphics.PointF;import android.util.AttributeSet;import android.util.DisplayMetrics;import android.util.Log;import android.view.MotionEvent;import android.view.VelocityTracker;import android.view.View;import android.view.ViewGroup;import android.view.WindowManager;import android.widget.Scroller;import android.widget.Toast;@SuppressLint("ClickableViewAccessibility")public class GuideView extends ViewGroup {/** * <attr name="orientation"> <enum name="horizontal" value="1" /> <enum * name="vertical" value="2" /> </attr> **//** 滑动方向 */private int mOrientation = 0;/** 水平方向 */private int mHorientation = 0;/** 垂直方向 */private int mVertical = 1;/** 屏幕宽度 */private int mScreenWidth;/** 屏幕高度 */private int mScreenHeight;/** 滑动状态 */private boolean isScrolling;/** 滑动辅助类 */private Scroller mScroller;/** 记录当前的x/y的值 */private PointF mPointF;/** 记录上一次的x、y值 */private PointF mLastPointF;/** Scroller 对应的开始坐标 */private Point mScrollStartPoint;/** Scroller 对应的结束坐标 */private Point mScrollStopPoint;/** 记录滑动的距离 */private PointF mDistancePointF;/**ScrollXY 的差值*/private Point mDistanceScrollPoint;/** 加速度检测 */private VelocityTracker mVelocityTracker;/**切换屏幕时的回调函数*/private OnPageChangeListener mOnPageChangeListener;/** * 记录当前页 */private int currentPage = 0;public GuideView(Context context, AttributeSet attrs, int defStyleAttr) {super(context, attrs, defStyleAttr);// TODO Auto-generated constructor stub// 获取自定义属性TypedArray mTypeArray = context.obtainStyledAttributes(attrs, R.styleable.GuideView_orientation);mOrientation = mTypeArray.getInteger(R.styleable.GuideView_orientation_orientation, mOrientation);mTypeArray.recycle();// 获取屏幕宽高initialScreen(context);mScroller = new Scroller(context);mPointF = new PointF();mLastPointF = new PointF();mScrollStartPoint = new Point();mScrollStopPoint = new Point();mDistancePointF = new PointF();mDistanceScrollPoint=new Point();}public GuideView(Context context, AttributeSet attrs) {this(context, attrs, 1);// TODO Auto-generated constructor stub}public GuideView(Context context) {this(context, null);// TODO Auto-generated constructor stub}@Overrideprotected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {// TODO Auto-generated method stubsuper.onMeasure(widthMeasureSpec, heightMeasureSpec);// 获取子布局，重新测量子布局宽高int count = getChildCount();for (int i = 0; i < count; i++) {measureChild(getChildAt(i), widthMeasureSpec, heightMeasureSpec);}}@Overrideprotected void onLayout(boolean changed, int l, int t, int r, int b) {// TODO Auto-generated method stubif (changed) {// 重新测量layout的位置MarginLayoutParams params = (MarginLayoutParams) getLayoutParams();int childCount = getChildCount();if (mOrientation == mHorientation) {params.width = mScreenWidth * getChildCount();setLayoutParams(params);for (int i = 0; i < childCount; i++) {View view = getChildAt(i);if (view.getVisibility() != View.GONE) {view.layout(i * mScreenWidth, t, i * mScreenWidth+ mScreenWidth, b);}}} else if (mOrientation == mVertical) {params.height = mScreenHeight * getChildCount();setLayoutParams(params);for (int i = 0; i < childCount; i++) {View view = getChildAt(i);// view 没有隐藏掉，就重新定位if (view.getVisibility() != View.GONE) {view.layout(l, i * mScreenHeight, r, i * mScreenHeight+ mScreenHeight);}}}}}@Overridepublic boolean onTouchEvent(MotionEvent event) {// TODO Auto-generated method stub// 先进行事件判断拦截if(currentPage==getChildCount()-1){Toast.makeText(getContext(), "finish", Toast.LENGTH_SHORT).show();return super.onTouchEvent(event);}if (isScrolling)return super.onTouchEvent(event);mPointF.x = event.getX();mPointF.y = event.getY();// 初始化加速度检测器initialVelocity(event);if (event.getAction() == MotionEvent.ACTION_DOWN) {// 当用户触摸时记录下坐标信息Log.i("info"," *******mPoint value****"+"x:"+mPointF.x+"y:"+mPointF.y);getStartScrollXY();mLastPointF.x = mPointF.x;mLastPointF.y = mPointF.y;} else if (event.getAction() == MotionEvent.ACTION_MOVE) {Log.i("info"," *******mLastPoint value****"+"x:"+mLastPointF.x+"y:"+mLastPointF.y);Log.i("info"," *******mPoint value****"+"x:"+mPointF.x+"y:"+mPointF.y);Log.i("info"," *******************************************");Log.i("info"," *******************************************");/*** Stops the animation. Contrary to* {@link #forceFinished(boolean)}, aborting the animating cause* the scroller to move to the final x and y position 源码说明：* mScroller.abortAnimation() 如果滑动还没有结束，那么就终止滑动。** @see #forceFinished(boolean)*/if (!mScroller.isFinished()) {mScroller.abortAnimation();}mDistancePointF.x = mLastPointF.x – mPointF.x;mDistancePointF.y = mLastPointF.y – mPointF.y;Log.i("info"," *******mDistancePointF value ******"+"dx: "+mDistancePointF.x+" dy: "+mDistancePointF.y);getStopScrollXY();// 先判断滑动的方向确定滑动的距离 scrollBy（x,y）// 1.y轴—向上滑动–下一个视图// 2.y轴—向下滑动–上一个视图// 3.x轴—向左滑动–下一个视图// 4.x轴—向右滑动–上一个视图/*** 320*480 -8 mlasty=-10 currenty=-2* distance=mlasty-currenty=-8《0 scrolly+distance<0?** 条件都满足时，，确定视图向上滑动，加载 下一个视图** 重新定义distanceY的值以便于ScrollBy(x,y)调用** 补充说明：* getScrollX()说明:=手机屏幕显示区域左上角x坐标减去MultiViewGroup视图左上角x坐标=320** getScrollY()说明:=手机屏幕显示区域左上角y坐标减去MultiViewGroup视图左上角y坐标=0(* 因为子视图的高度和手机屏幕高度一样)****/if (mOrientation == mHorientation) {if (mDistancePointF.x > 0&& mScrollStopPoint.x + mDistancePointF.x > getWidth()-mScreenWidth) {mDistancePointF.x = getWidth() – mScreenWidth -mScrollStopPoint.x;} else if (mDistancePointF.x < 0&& mScrollStopPoint.x + mDistancePointF.x < 0) {mDistancePointF.x = – mScrollStopPoint.x;}scrollBy((int) mDistancePointF.x, 0);} else if (mOrientation == mVertical) {if (mDistancePointF.y < 0&& mScrollStopPoint.y + mDistancePointF.y < 0) {mDistancePointF.y = -mScrollStopPoint.y;}if (mDistancePointF.y > 0&& mScrollStopPoint.y + mDistancePointF.y > getHeight()- mScreenHeight) {mDistancePointF.y = getHeight() – mScreenHeight- mScrollStopPoint.y;}scrollBy(0, (int) mDistancePointF.y);}mLastPointF.x = mPointF.x;mLastPointF.y = mPointF.y;} else if (event.getAction() == MotionEvent.ACTION_UP) {getStopScrollXY();getDistanceScrollXY();//比较滑动方向趋势//判断是上滑动还是下滑动if(checkDirection()){//上滑动《加载更多》if(isScrollToNext()){//能滑动到下一页if(mOrientation==mHorientation){mScroller.startScroll(getScrollX(), 0,mScreenWidth – mDistanceScrollPoint.x,0);}else if (mOrientation==mVertical){mScroller.startScroll(0, getScrollY(), 0, mScreenHeight- mDistanceScrollPoint.y);}}else{//不能滑动到下一页if(mOrientation==mHorientation){mScroller.startScroll(getScrollX(), 0,-mDistanceScrollPoint.x,0);}else if (mOrientation==mVertical){mScroller.startScroll(0, getScrollY(), 0, -mDistanceScrollPoint.y);}}}else{//《下滑动，刷新》if(isScrollToprivew()){//能滑动到上一页if(mOrientation==mHorientation){mScroller.startScroll( getScrollX(), 0,-mScreenWidth – mDistanceScrollPoint.x,0);}else if (mOrientation==mVertical){mScroller.startScroll(0, getScrollY(), 0,-mScreenHeight – mDistanceScrollPoint.y);}}else{//不能滑动到上一页if(mOrientation==mHorientation){mScroller.startScroll(getScrollX(),0, -mDistanceScrollPoint.x, 0);}else if (mOrientation==mVertical){mScroller.startScroll(0, getScrollY(), 0, -mDistanceScrollPoint.y);}}}isScrolling = true;postInvalidate();recycleVelocity();}return true;}/** * Called by a parent to request that a child update its values for mScrollX * and mScrollY if necessary. This will typically be done if the child is * animating a scroll using a {@link android.widget.Scroller Scroller} * object. * * 为了易于控制滑屏控制，Android框架提供了 computeScroll()方法去控制这个流程。在绘制View时，会在draw()过程调用该 * 方法。因此， 再配合使用Scroller实例，我们就可以获得当前应该的偏移坐标，手动使View/ViewGroup偏移至该处。 * computeScroll()方法原型如下，该方法位于ViewGroup.java类中*/@Overridepublic void computeScroll() {// TODO Auto-generated method stubsuper.computeScroll();if (mOrientation== mVertical) {if (mScroller.computeScrollOffset()) {scrollTo(0, mScroller.getCurrY());postInvalidate();} else {int position = getScrollY() / mScreenHeight;if (position != currentPage) {if (mOnPageChangeListener != null) {currentPage = position;mOnPageChangeListener.onPageChange(currentPage);}}}} else if (mOrientation== mHorientation) {if (mScroller.computeScrollOffset()) {scrollTo(mScroller.getCurrX(), 0);postInvalidate();} else {int position = getScrollX() / mScreenWidth;if (position != currentPage) {if (mOnPageChangeListener != null) {currentPage = position;mOnPageChangeListener.onPageChange(currentPage);}}}}isScrolling = false;}/************************************ Method *********************************************//** * 获取屏幕宽高 */public void initialScreen(Context context) {WindowManager mWindowManager = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);DisplayMetrics outMetrics = new DisplayMetrics();mWindowManager.getDefaultDisplay().getMetrics(outMetrics);mScreenWidth = outMetrics.widthPixels;mScreenHeight = outMetrics.heightPixels;}/** * 初始化加速度检测器 * * @param event */private void initialVelocity(MotionEvent event) {if (mVelocityTracker == null) {mVelocityTracker = VelocityTracker.obtain();}mVelocityTracker.addMovement(event);}/** * 初始化scrollX scrollY */private void getStartScrollXY(){mScrollStartPoint.x = getScrollX();mScrollStartPoint.y = getScrollY();}/** * 停止滑动后的ScrollX ScrollY */private void getStopScrollXY(){mScrollStopPoint.x = getScrollX();mScrollStopPoint.y = getScrollY();}/** * 比较滑动的ScrollX ScrollY差值 */private void getDistanceScrollXY(){mDistanceScrollPoint.x = mScrollStopPoint.x-mScrollStartPoint.x;mDistanceScrollPoint.y = mScrollStopPoint.y-mScrollStartPoint.y;}/** * 检查滑动方向 * @return true 加载更多 false 刷新 */public boolean checkDirection(){boolean mDirection =false;if (mOrientation == mVertical) {mDirection = mDistanceScrollPoint.y > 0 ? true : false;} else if (mOrientation== mHorientation) {mDirection = – mDistanceScrollPoint.x < 0 ? true : false;}return mDirection;}/** * 根据滑动距离判断 是否能够滑动到下一屏 * 加载跟多 * @return */private boolean isScrollToNext() {boolean isScrollTo = false;if (mOrientation == mVertical) {isScrollTo = mDistanceScrollPoint.y > mScreenHeight / 2|| Math.abs(getVelocity()) > 600;} else if (mOrientation == mHorientation) {isScrollTo = mDistanceScrollPoint.x > mScreenWidth / 2|| Math.abs(getVelocitx()) > 600;}return isScrollTo;}/** * 根据滑动距离判断 是否能够滑动到上一屏 * 刷新 * @return */private boolean isScrollToprivew() {boolean isScrollTo = false;if (mOrientation == mVertical) {isScrollTo = -mDistanceScrollPoint.y > mScreenHeight / 2|| Math.abs(getVelocity()) > 600;} else if (mOrientation == mHorientation) {isScrollTo = -mDistanceScrollPoint.x > mScreenWidth / 2|| Math.abs(getVelocitx()) > 600;}return isScrollTo;}/** * 获取x方向的加速度 * * @return */private int getVelocitx() {mVelocityTracker.computeCurrentVelocity(1000);int velocitx = (int) mVelocityTracker.getXVelocity(1000);velocitx = (int) mVelocityTracker.getXVelocity(1000);return velocitx;}/** * 获取y方向的加速度 * * @return */private int getVelocity() {mVelocityTracker.computeCurrentVelocity(1000);int velocity = (int) mVelocityTracker.getYVelocity(1000);velocity = (int) mVelocityTracker.getYVelocity(1000);return velocity;}/** * 释放资源 */private void recycleVelocity() {if (mVelocityTracker != null) {mVelocityTracker.recycle();mVelocityTracker = null;}}/** * 设置回调接口 * * @param onPageChangeListener */public void setOnPageChangeListener(OnPageChangeListener onPageChangeListener) {mOnPageChangeListener = onPageChangeListener;}/** * 回调接口 * * @author zhy * */public interface OnPageChangeListener {void onPageChange(int currentPage);}}
attrs:
我等你用尽了所有的哀伤；而你眼中却有我所不懂的凄凉。
