自定义SlidingMenu

自定义SlidingMenuimport com.nineoldandroids.animation.FloatEvaluator;import com.nineoldandroids.animation.IntEvaluator;import com.nineoldandroids.view.ViewHelper;import android.content.Context;import android.graphics.Color;import android.graphics.PorterDuff.Mode;import android.support.v4.view.ViewCompat;import android.support.v4.widget.ViewDragHelper;import android.util.AttributeSet;import android.view.DragEvent;import android.view.MotionEvent;import android.view.View;import android.view.ViewPropertyAnimator;import android.widget.FrameLayout;public class SlidingMenu extends FrameLayout {private ViewDragHelper dragHelper;private FloatEvaluator fV;private IntEvaluator iv;private OnDragStateChangeListener dragListener;/** * SlidingMenu的测量宽度 */private int slidingMenuWidth;/** * mainView可拖拽的范围 */private float dragRange;/** * 侧边栏的view */private View menuView;/** * 主view */private View mainView;/** * slidingMenu默认的状态是关闭的 */private DragState currentState = DragState.CLOSE;public SlidingMenu(Context context) {super(context);init();}public SlidingMenu(Context context, AttributeSet attrs) {super(context, attrs);init();}public SlidingMenu(Context context, AttributeSet attrs, int defStyle) {super(context, attrs, defStyle);init();}@Overridepublic boolean onInterceptTouchEvent(MotionEvent ev) {return dragHelper.shouldInterceptTouchEvent(ev);//用手势辅助类决定是否拦截事件}@Overridepublic boolean onTouchEvent(MotionEvent event) {dragHelper.processTouchEvent(event);return true;//消费事件}@Overrideprotected void onFinishInflate() {//当布局加载完成，一般用于获取子viewsuper.onFinishInflate();if(getChildCount()!=2){//默认只能处理两个view，超出则抛出异常throw new IllegalArgumentException("SlidingMenu only have two child！！！");}menuView = getChildAt(0);mainView = getChildAt(1);}@Override//onMeasure调用完后调用此方法protected void onSizeChanged(int w, int h, int oldw, int oldh) {// TODO Auto-generated method stubsuper.onSizeChanged(w, h, oldw, oldh);slidingMenuWidth = getMeasuredWidth();dragRange = slidingMenuWidth*0.6f;//子View可拖拽范围}/* * 必须实现，用于平滑移动 */@Overridepublic void computeScroll() {if(dragHelper.continueSettling(true)){//内部已经处理了移动ViewCompat.postInvalidateOnAnimation(SlidingMenu.this);//类似invalidate();}}/** * 初始化ViewDragHelper和FloatValue和IntValue */private void init() {dragHelper = ViewDragHelper.create(this, cb);//创建手势捕获辅助类，参数1要操作的view的父view,参数2回调fV = new FloatEvaluator();//float计算类iv = new IntEvaluator();//int计算类}private ViewDragHelper.Callback cb = new ViewDragHelper.Callback() {/** * 用于判断是否捕获当前view的触摸事件 *  * 参数 child 当前触摸的view *  *  return true：捕获并解析，false不处理 * */@Overridepublic boolean tryCaptureView(View child, int pointerId) {// TODO Auto-generated method stubreturn child==menuView || child==mainView;//需要操作的view//return child==mainView;//需要操作的view}/** * 控制child在水平方向的移动 left: * 表示ViewDragHelper认为你想让当前child的left改变的值,left=chile.getLeft()+dx dx: * 本次child水平方向移动的距离 return: 表示你真正想让child的left变成的值 */@Override//限制view的水平移动  left 是view移动后的left dx:水平移动的距离(与上次比较)public int clampViewPositionHorizontal(View child, int left, int dx) {if(child==mainView){if(left<0)left=0;//限制mainView的左边if(left>dragRange)left=(int) dragRange;//限制mainView的右边}  return left;}  /*@Override//限制view的竖直移动  top 是view移动后的top dy竖直移动的距离public int clampViewPositionVertical(View child, int top, int dy) {return top;//0即不移动}  */@Override//当操作view时，view位置改变时调用public void onViewPositionChanged(View changedView, int left, int top,int dx, int dy) {/*if(changedView==mainView){menuView.layout(menuView.getLeft()+dx/2, menuView.getTop(),menuView.getRight()+dx/2, menuView.getBottom());}*/if(changedView==menuView){//固定住menuViewmenuView.layout(0, 0, menuView.getMeasuredWidth(),menuView.getMeasuredHeight());//让mainView移动起来int newLeft = mainView.getLeft()+dx;System.out.println("dx.........  "+dx); if(newLeft<0)newLeft=0;//限制mainView的左边if(newLeft>dragRange)newLeft=(int) dragRange;//限制mainView的右边mainView.layout(newLeft,mainView.getTop()+dy,newLeft+mainView.getMeasuredWidth(),mainView.getBottom()+dy);}float fraction = mainView.getLeft()/dragRange;//计算移动百分比executeAnim(fraction);//执行动画if(fraction==0 && currentState!=DragState.CLOSE){currentState = DragState.CLOSE;//更改状态if(dragListener!=null){dragListener.onClose();}//回调关闭方法}else if(fraction==1f && currentState!=DragState.OPEN){currentState = DragState.OPEN;//打开状态if(dragListener!=null){dragListener.onOpen();}//回调打开方法}if(dragListener!=null){dragListener.onDraging(fraction);//回调正在拖动方法}}@Override//用户抬起时调用public void onViewReleased(View releasedChild, float xvel, float yvel) {if(mainView.getLeft()<dragRange/2){//当用户滑动小于限定距离一半时，让其关闭，否则打开close();//关闭侧边栏}else{open();//打开侧边栏}/* * xvel为水平滑动速度 * 当用户水平滑动速度大于200，并且处于关闭状态，则打开侧边, * 当用户向左滑动，即速度为负值，小于-200则关闭侧边栏 */if(xvel>200 && currentState!=DragState.OPEN){open();}else if(xvel<-200 &¤tState!=DragState.CLOSE ){close();}}  @Override//获取水平拖拽范围public int getViewHorizontalDragRange(View child) {// TODO Auto-generated method stubreturn (int) dragRange;}};/**枚举，slidingMenu的开关状态 * @author Administrator * */enum DragState{OPEN,CLOSE;}/**获取slidingMenu的开关状态 * @return DragState */public DragState getCurrentState(){return currentState;}/** * 打开侧边栏动画 */protected void open() {dragHelper.smoothSlideViewTo(mainView, (int) dragRange, mainView.getTop());ViewCompat.postInvalidateOnAnimation(SlidingMenu.this);}/** * 关闭侧边栏动画 */protected void close() {dragHelper.smoothSlideViewTo(mainView, 0, mainView.getTop());ViewCompat.postInvalidateOnAnimation(SlidingMenu.this);}/**执行子view的动画 * @param fraction 拖动的百分比 */protected void executeAnim(float fraction) {/* * menuView执行缩放，透明，位移，动画 */ViewHelper.setAlpha(menuView, fV.evaluate(fraction, 0.3f, 1f));//从半透明到不透明ViewHelper.setScaleX(menuView, fV.evaluate(fraction, 0.5f, 1f));//x轴放大ViewHelper.setScaleY(menuView, fV.evaluate(fraction, 0.5f, 1f));//Y轴放大ViewHelper.setTranslationX(menuView, fV.evaluate(fraction, -menuView.getMeasuredWidth(), 0));//从隐藏一半到出现/* * mainView，执行缩放 */ViewHelper.setScaleX(mainView, fV.evaluate(fraction, 1f,0.8f));//x轴缩小ViewHelper.setScaleY(mainView, fV.evaluate(fraction, 1f,0.8f));//Y轴缩小/* * 给SlidingMenu背景添加黑色遮罩效果 * mode：参数是指覆盖到上面 */getBackground().setColorFilter((Integer) ColorUtil.evaluateColor(fraction, Color.BLACK,Color.TRANSPARENT), Mode.SRC_OVER);}public void setOnDragStateChangeListener(OnDragStateChangeListener dragListener){zthis.dragListener = dragListener;}/**侧边栏状态监听回调接口 * @author Administrator * */public interface OnDragStateChangeListener{/** * 侧边栏被打开 */void onOpen();/** * 侧边栏被关闭 */void onClose();/**正在拖动 * @param fraction 拖动距离的百分比 */void onDraging(float fraction);}}