RecyclerView下拉刷新和上拉加载更多
来源：互联网 发布：毕向东35天java教学 编辑：程序博客网 时间：2024/05/18 16:16
效果图，第一次做gif，捣鼓了半天，效果做的不好，请谅解
谷歌在v4包下提供了一个SwipeRefreshLayout来实现RecyclerView的下拉刷新，但是此类并不提供上拉加载更多的一个功能，网上有很多的博客实现了上拉加载，但是上拉的效果图和之前的一样，今天我就实现类似于SwipeRefreshLayout刷新的效果图。圆形进度条的实现类MaterialProgressDrawable，之后解决的就是什么时候让圆形进度条显示，如何让圆形进度条随着手指上下滑动。
就是在dispatchTouchEvent分发事件的时候，不断的去检测RecyclerView是否已经下拉到底部了，这时就让圆形进度条显示，如何再向上滑动就向上滑动，向下滑动就向下滑动，松开就计算滑动的高度是否符合加载的高度，符合就固定圆形进度条让其滚动，不符合就消失。
判断是否已经到底部了
private boolean canPullUp() { RecyclerView.LayoutManager lm = mRecyclerView.getLayoutManager(); mLastVisiblePosition = getLastVisibleItemPosition(); int count = mRecyclerView.getAdapter().getItemCount(); if (0 == count) { // 没有item的时候可以上拉加载 return true; } else if (mLastVisiblePosition == (count - 1)) { // 滑到底部了可以上拉加载 if (lm.findViewByPosition(count - 1).getBottom() <= getMeasuredHeight()) { return true; } } return false; }不断检测滑动的位置，显示圆形进度条的位置
@Override public boolean dispatchTouchEvent(MotionEvent event) { if(!mIsAllowLoadMore) return super.dispatchTouchEvent(event); switch (event.getAction()) { case MotionEvent.ACTION_DOWN: mStartY = (int) event.getRawY(); break; case MotionEvent.ACTION_MOVE: if (!mStart) { //如果不满足上拉的条件就直接分发事件 if(!canPullUp()){ return super.dispatchTouchEvent(event); } if (canPullUp() && !mIsCanScoll) { showRefreshArrow(); mStartY = (int) event.getRawY(); mIsCanScoll = true; } else { //mStartY = (int) event.getRawY(); //hideRefreshArrow(); //hide(); } if (mVisibleCanScoll) { int endY = (int) event.getRawY(); int offset = mStartY - endY; //System.out.println("----------------------offset:" + offset); LayoutParams lp = (LayoutParams) mImageView.getLayoutParams(); int bottomMargin = lp.bottomMargin; bottomMargin += offset; if (bottomMargin >= PULL_IMAGE_SIZE_PX_MAX) { bottomMargin = PULL_IMAGE_SIZE_PX_MAX; } if (bottomMargin <= -PULL_IMAGE_SIZE_PX) { bottomMargin = -PULL_IMAGE_SIZE_PX; } lp.setMargins(lp.leftMargin, lp.topMargin, lp.rightMargin, bottomMargin); mImageView.setLayoutParams(lp); rotateAniamtor(bottomMargin * ROTATE_ANIM_ANGLE_PER); mStartY = endY; } LayoutParams lp = (LayoutParams) mImageView.getLayoutParams(); //如果按住上拉时，上拉箭头向下滑动的时候事件不应分发 if(mVisable && lp.bottomMargin > -PULL_IMAGE_SIZE_PX){ mIsDispatch = false; }else if(mVisable && lp.bottomMargin == -PULL_IMAGE_SIZE_PX){//等到上拉箭头被隐藏掉的时候在分发事件 mIsDispatch = true; } //是否分发事件 if(!mIsDispatch) { return false; } else { return super.dispatchTouchEvent(event); } } break; case MotionEvent.ACTION_UP: case MotionEvent.ACTION_CANCEL: if (!mStart) { if (mVisibleCanScoll) { LayoutParams lp = (LayoutParams) mImageView.getLayoutParams(); if (lp.bottomMargin >= PULL_IMAGE_SIZE_PX_EXECUTE) { //lp.setMargins(lp.leftMargin, lp.topMargin, lp.rightMargin, PULL_IMAGE_SIZE_PX / 3 * 2); //mImageView.setLayoutParams(lp); //start(); getValueToTranslation(); mPrepareAnimation = true; if (mOnPullListener != null) { mOnPullListener.onLoadMore(this); } } else { hideArrow(); } } if (!mStart && !mPrepareAnimation) hideArrow(); } mIsCanScoll = false; break; } return super.dispatchTouchEvent(event); }当上拉松开时会有一个滑动的动画
/** * 执行平移动画 * @param from * @param to */ private void translationTo(int from,int to,final boolean isShow){ //1.调用ofInt(int...values)方法创建ValueAnimator对象 ValueAnimator mAnimator = ValueAnimator.ofInt(from,to); //2.为目标对象的属性变化设置监听器 mAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() { @Override public void onAnimationUpdate(ValueAnimator animation) { // 3.为目标对象的属性设置计算好的属性值 int animatorValue = (int)animation.getAnimatedValue(); MarginLayoutParams marginLayoutParams = (MarginLayoutParams) mImageView.getLayoutParams(); marginLayoutParams.bottomMargin = animatorValue; mImageView.setLayoutParams(marginLayoutParams); } }); mAnimator.addListener(new AnimatorListenerAdapter() { @Override public void onAnimationEnd(Animator animation) { super.onAnimationEnd(animation); if(isShow){ start(); mPrepareAnimation = false; }else{ hideRefreshArrow(); hide(); } } }); //4.设置动画的持续时间、是否重复及重复次数等属性 mAnimator.setDuration(100); //mAnimator.setRepeatCount(3); mAnimator.setRepeatMode(ValueAnimator.INFINITE); //5.为ValueAnimator设置目标对象并开始执行动画 mAnimator.setTarget(mImageView); mAnimator.start(); }圆形进度条随着滑动的距离产生旋转动画
/** * 旋转动画效果 */ private void rotateAniamtor(float from){ ObjectAnimator mAnimatorRotate = ObjectAnimator.ofFloat(mImageView, "rotation",from,from + 1); mAnimatorRotate.setRepeatMode(Animation.INFINITE); mAnimatorRotate.setRepeatCount(1); mAnimatorRotate.setDuration(10); mAnimatorRotate.start(); }圆形进度条的阴影背景实现
/** * mImageView的背景 */ private Drawable getShapeDrawable() { /** * <layer-list xmlns:android="http://schemas.android.com/apk/res/android" > <!-- 第一层 上部和左部偏移一定距离--> <item > <shape android:shape="oval"> <solid android:color="#f5f5f5" /> <!-- 描边 --> <stroke android:width="0.5dp" android:color="#99f5f5f5" /> </shape> </item> <!-- 第二层 下部和有部偏移一定距离--> <item android:left="2dp" android:top="2dp" android:bottom="2dp" android:right="2dp"> <shape android:shape="oval"> <solid android:color="#ffffff" /> <!-- 描边 --> <!--<stroke android:width="0.33dp" android:color="#dedede" />--> </shape> </item> </layer-list> */ //代码实现 GradientDrawable gradientDrawable = new GradientDrawable(); gradientDrawable.setShape(GradientDrawable.OVAL); gradientDrawable.setColor(Color.parseColor("#f5f5f5")); int stroke = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 0.5f, getContext().getResources().getDisplayMetrics()); gradientDrawable.setStroke(stroke,Color.parseColor("#99f5f5f5")); GradientDrawable gradientDrawable2 = new GradientDrawable(); gradientDrawable2.setShape(GradientDrawable.OVAL); gradientDrawable2.setColor(Color.parseColor("#ffffff")); LayerDrawable drawable = new LayerDrawable(new Drawable[]{gradientDrawable,gradientDrawable2}); int padding = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 2, getContext().getResources().getDisplayMetrics()); drawable.setLayerInset(1,padding,padding,padding,padding);////第一个参数1代表数组的第二个元素，为白色 return drawable; }好了，源码就分析到这，如果发现bug或者有任何意见欢迎留言。
源码：
package com.cj.recyclerview.refresh;import android.animation.Animator;import android.animation.AnimatorListenerAdapter;import android.animation.ObjectAnimator;import android.animation.ValueAnimator;import android.content.Context;import android.content.res.Resources;import android.graphics.Color;import android.graphics.drawable.Drawable;import android.graphics.drawable.GradientDrawable;import android.graphics.drawable.LayerDrawable;import android.support.annotation.ColorRes;import android.support.v4.widget.SwipeRefreshLayout;import android.support.v7.widget.GridLayoutManager;import android.support.v7.widget.LinearLayoutManager;import android.support.v7.widget.RecyclerView;import android.support.v7.widget.StaggeredGridLayoutManager;import android.util.AttributeSet;import android.util.TypedValue;import android.view.MotionEvent;import android.view.View;import android.view.ViewGroup;import android.view.animation.Animation;import android.view.animation.DecelerateInterpolator;import android.widget.ImageView;import android.widget.RelativeLayout;/** * Created by chenj on 2016/9/28. */public class PullRefreshLayout extends RelativeLayout { private int[] colors = { 0xFFFF0000, 0xFFFF7F00, 0xFFFFFF00, 0xFF00FF00 , 0xFF00FFFF, 0xFF0000FF, 0xFF8B00FF}; private final int CIRCLE_BG_LIGHT = 0xFFFAFAFA; private MaterialProgressDrawable mProgress; private ValueAnimator mValueAnimator; private boolean mStart = false; private boolean mVisable = false; private static final int PULL_IMAGE_SIZE = 40; private static int PULL_IMAGE_SIZE_PX;//上拉View的大小（像素） private static int PULL_IMAGE_SIZE_PX_MAX ;//最大拉动的距离 private static int PULL_IMAGE_SIZE_PX_EXECUTE ;//拉动到什么位置开始执行 private static int PULL_IMAGE_SIZE_PX_EXECUTE_REFRESH ;//刷新是所在的位置 private static float ROTATE_ANIM_ANGLE_PER;//根据最大距离计算旋转角度的比列 private ImageView mImageView; private boolean mIsFirst; private int mStartY, mLastY; private RecyclerView mRecyclerView; //private int mFirstVisiblePosition; private int mLastVisiblePosition; private boolean mIsCanScoll; private boolean mVisibleCanScoll; private boolean mPrepareAnimation;//准备执行动画 private boolean mIsAllowLoadMore = true;//是否可以上拉刷新 private boolean mIsDispatch = true;//是否分发事件 public PullRefreshLayout(Context context) { this(context, null); } public PullRefreshLayout(Context context, AttributeSet attrs) { this(context, attrs, 0); } public PullRefreshLayout(Context context, AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); } /** * 是否允许下拉加载更多 * @param allowLoadMore */ public void setAllowLoadMore(boolean allowLoadMore) { mIsAllowLoadMore = allowLoadMore; } public boolean isAllowLoadMore() { return mIsAllowLoadMore; } /** * 设置进度圈的颜色 * @param colors 如：0xFFFF0000 */ public void setColorSchemeColors(int... colors){ this.colors = colors; } /** * 设置进度圈的颜色 * @param colorResIds 如：R.color.red */ public void setColorSchemeResources(@ColorRes int... colorResIds) { final Resources res = getResources(); int[] colorRes = new int[colorResIds.length]; for (int i = 0; i < colorResIds.length; i++) { colorRes[i] = res.getColor(colorResIds[i]); } setColorSchemeColors(colorRes); } @Override protected void onLayout(boolean changed, int l, int t, int r, int b) { super.onLayout(changed, l, t, r, b); if (!mIsFirst) { createProgressView(); over: for (int i = 0; i < getChildCount(); i++) { View childView = getChildAt(i); if (childView instanceof SwipeRefreshLayout) { ViewGroup viewGroup = (ViewGroup) childView; for (int j = 0; j < viewGroup.getChildCount(); j++) { View childViewJ = viewGroup.getChildAt(j); if (childViewJ instanceof RecyclerView) { mRecyclerView = (RecyclerView) childViewJ; break over; } } } if(childView instanceof RecyclerView){ mRecyclerView = (RecyclerView) childView; break over; } } mIsFirst = true; } } @Override public boolean dispatchTouchEvent(MotionEvent event) { if(!mIsAllowLoadMore) return super.dispatchTouchEvent(event); switch (event.getAction()) { case MotionEvent.ACTION_DOWN: mStartY = (int) event.getRawY(); break; case MotionEvent.ACTION_MOVE: if (!mStart) { //如果不满足上拉的条件就直接分发事件 if(!canPullUp()){ return super.dispatchTouchEvent(event); } if (canPullUp() && !mIsCanScoll) { showRefreshArrow(); mStartY = (int) event.getRawY(); mIsCanScoll = true; } else { //mStartY = (int) event.getRawY(); //hideRefreshArrow(); //hide(); } if (mVisibleCanScoll) { int endY = (int) event.getRawY(); int offset = mStartY - endY; //System.out.println("----------------------offset:" + offset); LayoutParams lp = (LayoutParams) mImageView.getLayoutParams(); int bottomMargin = lp.bottomMargin; bottomMargin += offset; if (bottomMargin >= PULL_IMAGE_SIZE_PX_MAX) { bottomMargin = PULL_IMAGE_SIZE_PX_MAX; } if (bottomMargin <= -PULL_IMAGE_SIZE_PX) { bottomMargin = -PULL_IMAGE_SIZE_PX; } lp.setMargins(lp.leftMargin, lp.topMargin, lp.rightMargin, bottomMargin); mImageView.setLayoutParams(lp); rotateAniamtor(bottomMargin * ROTATE_ANIM_ANGLE_PER); mStartY = endY; } LayoutParams lp = (LayoutParams) mImageView.getLayoutParams(); //如果按住上拉时，上拉箭头向下滑动的时候事件不应分发 if(mVisable && lp.bottomMargin > -PULL_IMAGE_SIZE_PX){ mIsDispatch = false; }else if(mVisable && lp.bottomMargin == -PULL_IMAGE_SIZE_PX){//等到上拉箭头被隐藏掉的时候在分发事件 mIsDispatch = true; } //是否分发事件 if(!mIsDispatch) { return false; } else { return super.dispatchTouchEvent(event); } } break; case MotionEvent.ACTION_UP: case MotionEvent.ACTION_CANCEL: if (!mStart) { if (mVisibleCanScoll) { LayoutParams lp = (LayoutParams) mImageView.getLayoutParams(); if (lp.bottomMargin >= PULL_IMAGE_SIZE_PX_EXECUTE) { //lp.setMargins(lp.leftMargin, lp.topMargin, lp.rightMargin, PULL_IMAGE_SIZE_PX / 3 * 2); //mImageView.setLayoutParams(lp); //start(); getValueToTranslation(); mPrepareAnimation = true; if (mOnPullListener != null) { mOnPullListener.onLoadMore(this); } } else { hideArrow(); } } if (!mStart && !mPrepareAnimation) hideArrow(); } mIsCanScoll = false; break; } return super.dispatchTouchEvent(event); } private void hideArrow() { LayoutParams lp = (LayoutParams) mImageView.getLayoutParams(); //lp.setMargins(lp.leftMargin, lp.topMargin, lp.rightMargin, -PULL_IMAGE_SIZE_PX); //mImageView.setLayoutParams(lp); translationTo(lp.bottomMargin,-PULL_IMAGE_SIZE_PX,false); } private void showRefreshArrow() { mImageView.setVisibility(View.VISIBLE); visable(); } /** * 隐藏箭头显示的载体ImageView */ private void hideRefreshArrow() { mImageView.setVisibility(View.GONE); } private boolean canPullUp() { if(mRecyclerView == null || mRecyclerView.getAdapter() == null) return false; RecyclerView.LayoutManager lm = mRecyclerView.getLayoutManager(); mLastVisiblePosition = getLastVisibleItemPosition(); int count = mRecyclerView.getAdapter().getItemCount(); if (0 == count) { // 没有item的时候也可以上拉加载 return true; } else if (mLastVisiblePosition == (count - 1)) { // 滑到底部了 if (lm.findViewByPosition(count - 1).getBottom() <= getMeasuredHeight()) { return true; } } return false; } /** * 获取底部可见项的位置 * * @return */ private int getLastVisibleItemPosition() { RecyclerView.LayoutManager lm = mRecyclerView.getLayoutManager(); int lastVisibleItemPosition = 0; if (lm instanceof GridLayoutManager) { lastVisibleItemPosition = ((GridLayoutManager) lm).findLastVisibleItemPosition(); } else if (lm instanceof LinearLayoutManager) { lastVisibleItemPosition = ((LinearLayoutManager) lm).findLastVisibleItemPosition(); } return lastVisibleItemPosition; } /** * 创建刷新View和初始化一些数据 */ private void createProgressView() { mImageView = new ImageView(getContext()); int size = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, PULL_IMAGE_SIZE, getContext().getResources().getDisplayMetrics()); PULL_IMAGE_SIZE_PX = size; PULL_IMAGE_SIZE_PX_MAX = PULL_IMAGE_SIZE_PX * 2; PULL_IMAGE_SIZE_PX_EXECUTE = PULL_IMAGE_SIZE_PX; PULL_IMAGE_SIZE_PX_EXECUTE_REFRESH = PULL_IMAGE_SIZE_PX / 3 * 2; ROTATE_ANIM_ANGLE_PER = (360.0f / PULL_IMAGE_SIZE_PX_MAX); LayoutParams lp = new LayoutParams(size, size); lp.addRule(RelativeLayout.ALIGN_PARENT_BOTTOM); lp.addRule(RelativeLayout.CENTER_HORIZONTAL); lp.setMargins(lp.leftMargin, lp.topMargin, lp.rightMargin, -PULL_IMAGE_SIZE_PX); mImageView.setLayoutParams(lp); mImageView.setBackground(getShapeDrawable()); addView(mImageView); mImageView.setVisibility(View.GONE); mProgress = new MaterialProgressDrawable(getContext(), mImageView); mProgress.setBackgroundColor(CIRCLE_BG_LIGHT); //圈圈颜色,可以是多种颜色 mProgress.setColorSchemeColors(colors); //设置圈圈的各种大小 mProgress.updateSizes(MaterialProgressDrawable.LARGE); mImageView.setImageDrawable(mProgress); } /** * mImageView的背景 */ private Drawable getShapeDrawable() { /** * <layer-list xmlns:android="http://schemas.android.com/apk/res/android" > <!-- 第一层 上部和左部偏移一定距离--> <item > <shape android:shape="oval"> <solid android:color="#f5f5f5" /> <!-- 描边 --> <stroke android:width="0.5dp" android:color="#99f5f5f5" /> </shape> </item> <!-- 第二层 下部和有部偏移一定距离--> <item android:left="2dp" android:top="2dp" android:bottom="2dp" android:right="2dp"> <shape android:shape="oval"> <solid android:color="#ffffff" /> <!-- 描边 --> <!--<stroke android:width="0.33dp" android:color="#dedede" />--> </shape> </item> </layer-list> */ //代码实现 GradientDrawable gradientDrawable = new GradientDrawable(); gradientDrawable.setShape(GradientDrawable.OVAL); gradientDrawable.setColor(Color.parseColor("#f5f5f5")); int stroke = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 0.5f, getContext().getResources().getDisplayMetrics()); gradientDrawable.setStroke(stroke,Color.parseColor("#99f5f5f5")); GradientDrawable gradientDrawable2 = new GradientDrawable(); gradientDrawable2.setShape(GradientDrawable.OVAL); gradientDrawable2.setColor(Color.parseColor("#ffffff")); LayerDrawable drawable = new LayerDrawable(new Drawable[]{gradientDrawable,gradientDrawable2}); int padding = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 2, getContext().getResources().getDisplayMetrics()); drawable.setLayerInset(1,padding,padding,padding,padding);////第一个参数1代表数组的第二个元素，为白色 return drawable; } /** * 隐藏箭头 */ private void hide() { if (mValueAnimator != null) { mValueAnimator.cancel(); mVisable = false; mVisibleCanScoll = false; } } private void visable() { if (mValueAnimator == null) { mValueAnimator = mValueAnimator.ofFloat(0f, 1f); mValueAnimator.setDuration(10); mValueAnimator.setInterpolator(new DecelerateInterpolator()); mValueAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() { @Override public void onAnimationUpdate(ValueAnimator animation) { float n = (float) animation.getAnimatedValue(); //圈圈的旋转角度 mProgress.setProgressRotation(n * 0.5f); //圈圈周长，0f-1F mProgress.setStartEndTrim(0f, n * 0.8f); //箭头大小，0f-1F mProgress.setArrowScale(n); //透明度，0-255 mProgress.setAlpha((int) (255 * n)); } }); mValueAnimator.addListener(new AnimatorListenerAdapter() { @Override public void onAnimationEnd(Animator animation) { super.onAnimationEnd(animation); mVisable = true; } }); } if (!mValueAnimator.isRunning()) { if (!mVisable) { //是否显示箭头 mProgress.showArrow(true); mValueAnimator.start(); mVisibleCanScoll = true; } } } private void start() { if (mVisable) { if (!mStart) { mProgress.start(); mStart = true; } } } /** * 计算执行动画的距离参数 */ private void getValueToTranslation() { //如果mImageView还没有被创建出来是不会执行的 if(mImageView != null) { LayoutParams lp = (LayoutParams) mImageView.getLayoutParams(); int bottomMargin = lp.bottomMargin; //执行平移 translationTo(bottomMargin, PULL_IMAGE_SIZE_PX_EXECUTE_REFRESH, true); } } private void stop() { if (mStart) { mProgress.stop(); mStart = false; mVisable = false; mVisibleCanScoll = false; } } /** * 执行平移动画 * @param from * @param to */ private void translationTo(int from,int to,final boolean isShow){ //1.调用ofInt(int...values)方法创建ValueAnimator对象 ValueAnimator mAnimator = ValueAnimator.ofInt(from,to); //2.为目标对象的属性变化设置监听器 mAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() { @Override public void onAnimationUpdate(ValueAnimator animation) { // 3.为目标对象的属性设置计算好的属性值 int animatorValue = (int)animation.getAnimatedValue(); MarginLayoutParams marginLayoutParams = (MarginLayoutParams) mImageView.getLayoutParams(); marginLayoutParams.bottomMargin = animatorValue; mImageView.setLayoutParams(marginLayoutParams); } }); mAnimator.addListener(new AnimatorListenerAdapter() { @Override public void onAnimationEnd(Animator animation) { super.onAnimationEnd(animation); if(isShow){ start(); mPrepareAnimation = false; }else{ hideRefreshArrow(); hide(); } } }); //4.设置动画的持续时间、是否重复及重复次数等属性 mAnimator.setDuration(100); //mAnimator.setRepeatCount(3); mAnimator.setRepeatMode(ValueAnimator.INFINITE); //5.为ValueAnimator设置目标对象并开始执行动画 mAnimator.setTarget(mImageView); mAnimator.start(); } /** * 旋转动画效果 */ private void rotateAniamtor(float from){ ObjectAnimator mAnimatorRotate = ObjectAnimator.ofFloat(mImageView, "rotation",from,from + 1); mAnimatorRotate.setRepeatMode(Animation.INFINITE); mAnimatorRotate.setRepeatCount(1); mAnimatorRotate.setDuration(10); mAnimatorRotate.start(); } /** * 加载更多或停止加载更多 * @param refreshing */ public void setRefreshing(boolean refreshing) { if(!mIsAllowLoadMore) return; if(refreshing){ if(mStart) return; showRefreshArrow(); getValueToTranslation(); mPrepareAnimation = true; if (mOnPullListener != null) { mOnPullListener.onLoadMore(this); } mIsCanScoll = false; }else { stop(); hideArrow(); } } /** * 当前是否在上拉刷新 * @return */ public boolean isRefreshing(){ return mStart; } /** * 刷新加载回调接口 * */ public interface OnPullListener { /** * 加载操作 */ void onLoadMore(PullRefreshLayout pullRefreshLayout); } private OnPullListener mOnPullListener; public void setOnPullListener(OnPullListener listener) { mOnPullListener = listener; }}好了，和下拉刷新的动画一样的效果终于实现了。
源码下载地址：CSDN下载地址
GitHub下载地址
参考：http://blog.csdn.net/zhongkejingwang/article/details/38868463
http://blog.csdn.net/lmj623565791/article/details/51118836/
http://blog.csdn.net/tyzlmjj/article/details/50557397 1 0
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