android开发学习 ------- 仿QQ侧滑效果的实现

时间:2021-05-01 11:06:03

需要做一个仿QQ侧滑删除的一个效果;

一开始是毫无头绪,百度找思路,找到  https://blog.csdn.net/xiaxiazaizai01/article/details/53036994  讲述的比较清楚,就知道是涉及Android中的哪部分知识的;

然后 https://blog.csdn.net/zxt0601/article/details/53157090  有封装一个自定义ViewGroup;用法在 https://github.com/mcxtzhang/SwipeDelMenuLayout

1:在project的build.gradle中添加:

allprojects {
repositories {
google()
jcenter()
//侧滑菜单添加的
maven {url "https://jitpack.io"}
}
}

2:在app的build.gradle中添加:

dependencies {

    compile 'com.github.mcxtzhang:SwipeDelMenuLayout:V1.3.0'
}

3:

/**
* Created by lemon on 2018/4/4.
*/ public class SwipeRecyclerViewActivity extends AppCompatActivity { List mlist;
RecyclerView rv; @Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_recyclerview);
initData();
rv = findViewById(R.id.recyclerview);
LinearLayoutManager manager = new LinearLayoutManager(this);
rv.setLayoutManager(manager);
RecyclerViewAdapter adapter = new RecyclerViewAdapter(mlist,this);
rv.setAdapter(adapter);
} private void initData() {
mlist = new ArrayList<String>();
for (int i = 0; i < 20; i++) {
mlist.add("data:"+i);
}
}
}

4:activity_recyclerview.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:android="http://schemas.android.com/apk/res/android">
<android.support.v7.widget.RecyclerView
android:id="@+id/recyclerview"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
</RelativeLayout>

5:

/**
* Created by lemon on 2018/4/4.
*/ public class RecyclerViewAdapter extends RecyclerView.Adapter<RecyclerViewAdapter.ViewHolder> { private List<String> mlist;
private Context mcxt; public RecyclerViewAdapter(List mlist, Context mcxt) {
this.mlist = mlist;
this.mcxt = mcxt;
} /**
* 加载子item布局
*/
@Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater.from(mcxt).inflate(R.layout.item,parent,false);
ViewHolder holder = new ViewHolder(view);
return holder;
} /**
* 对子item 进行赋值
*/
@Override
public void onBindViewHolder(ViewHolder holder, final int position) {
String value = mlist.get(position);
holder.tv_content.setText(value);
holder.btn_delete.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
mlist.remove(position);
notifyDataSetChanged();
}
});
} @Override
public int getItemCount() {
return mlist.size();
} static class ViewHolder extends RecyclerView.ViewHolder{
TextView tv_content;
Button btn_top,btn_unread,btn_delete; public ViewHolder(View itemView) {
super(itemView);
tv_content = itemView.findViewById(R.id.content);
btn_top = itemView.findViewById(R.id.btnTop);
btn_unread = itemView.findViewById(R.id.btnUnRead);
btn_delete = itemView.findViewById(R.id.btnDelete);
}
}
}

6: item.xml

<?xml version="1.0" encoding="utf-8"?>
<com.mcxtzhang.swipemenulib.SwipeMenuLayout 自定义的ViewGroup
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="100dp"
android:clickable="true"
android:paddingBottom="1dp"
>
<TextView
android:id="@+id/content"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="?android:attr/selectableItemBackground"
android:gravity="center"
android:text="项目中我是任意复杂的原ContentItem布局"/> <!-- 以下都是侧滑菜单的内容依序排列 -->
<Button
android:id="@+id/btnTop"
android:layout_width="60dp"
android:layout_height="match_parent"
android:background="#d9dee4"
android:text="置顶"
android:textColor="@android:color/white"/> <Button
android:id="@+id/btnUnRead"
android:layout_width="80dp"
android:layout_height="match_parent"
android:background="#ecd50a"
android:clickable="true"
android:text="标记未读"
android:textColor="@android:color/white"/> <Button
android:id="@+id/btnDelete"
android:layout_width="60dp"
android:layout_height="match_parent"
android:background="@color/colorAccent"
android:text="删除"
android:textColor="@android:color/white"/> </com.mcxtzhang.swipemenulib.SwipeMenuLayout>

这样就可以达到效果了。。。

难点就是 自定义的ViewGroup:

/**
* 【Item侧滑删除菜单】
* 继承自ViewGroup,实现滑动出现删除等选项的效果,
* 思路:跟随手势将item向左滑动,
* 在onMeasure时 将第一个Item设为屏幕宽度
* 【解决屏幕上多个侧滑删除菜单】:内设一个类静态View类型变量 ViewCache,存储的是当前正处于右滑状态的CstSwipeMenuItemViewGroup,
* 每次Touch时对比,如果两次Touch的不是一个View,那么令ViewCache恢复普通状态,并且设置新的CacheView
* 只要有一个侧滑菜单处于打开状态, 就不给外层布局上下滑动了
* <p/>
* 平滑滚动使用的是Scroller,20160811,最新平滑滚动又用属性动画做了,因为这样更酷炫(设置加速器不同)
* <p/>
* 20160824,fix 【多指一起滑我的情况】:只接第一个客人(使用一个类静态布尔变量)
* other:
* 1 菜单处于侧滑时,拦截长按事件
* 2 解决侧滑时 点击 的冲突
* 3 通过 isIos 变量控制是否是IOS阻塞式交互,默认是打开的。
* 4 通过 isSwipeEnable 变量控制是否开启右滑菜单,默认打开。(某些场景,复用item,没有编辑权限的用户不能右滑)
* 5 2016 09 29 add,,通过开关 isLeftSwipe支持左滑右滑
* 6 2016 10 21 add , 增加viewChache 的 get()方法,可以用在:当点击外部空白处时,关闭正在展开的侧滑菜单。
* 7 2016 10 22 fix , 当父控件宽度不是全屏时的bug。
* 2016 10 22 add , 仿QQ,侧滑菜单展开时,点击除侧滑菜单之外的区域,关闭侧滑菜单。
* 8 2016 11 03 add,判断手指起始落点,如果距离属于滑动了,就屏蔽一切点击事件。
* 9 2016 11 04 fix 长按事件和侧滑的冲突。
* 10 2016 11 09 add,适配GridLayoutManager,将以第一个子Item(即ContentItem)的宽度为控件宽度。
* 11 2016 11 14 add,支持padding,且后续计划加入上滑下滑,因此不再支持ContentItem的margin属性。
* 2016 11 14 add,修改回弹的动画,更平滑。
* 2016 11 14 fix,微小位移的move不回回弹的bug
* 2016 11 18,fix 当ItemView存在高度可变的情况
* 2016 12 07,fix 禁止侧滑时(isSwipeEnable false),点击事件不受干扰。
* 2016 12 09,fix ListView快速滑动快速删除时,偶现菜单不消失的bug。
* Created by zhangxutong .
* Date: 16/04/24
*/
public class SwipeMenuLayout extends ViewGroup {
private static final String TAG = "zxt/SwipeMenuLayout"; private int mScaleTouchSlop;//为了处理单击事件的冲突
private int mMaxVelocity;//计算滑动速度用
private int mPointerId;//多点触摸只算第一根手指的速度
private int mHeight;//自己的高度
//右侧菜单宽度总和(最大滑动距离)
private int mRightMenuWidths; //滑动判定临界值(右侧菜单宽度的40%) 手指抬起时,超过了展开,没超过收起menu
private int mLimit; private View mContentView;//2016 11 13 add ,存储contentView(第一个View) //private Scroller mScroller;//以前item的滑动动画靠它做,现在用属性动画做
//上一次的xy
private PointF mLastP = new PointF();
//2016 10 22 add , 仿QQ,侧滑菜单展开时,点击除侧滑菜单之外的区域,关闭侧滑菜单。
//增加一个布尔值变量,dispatch函数里,每次down时,为true,move时判断,如果是滑动动作,设为false。
//在Intercept函数的up时,判断这个变量,如果仍为true 说明是点击事件,则关闭菜单。
private boolean isUnMoved = true; //2016 11 03 add,判断手指起始落点,如果距离属于滑动了,就屏蔽一切点击事件。
//up-down的坐标,判断是否是滑动,如果是,则屏蔽一切点击事件
private PointF mFirstP = new PointF();
private boolean isUserSwiped; //存储的是当前正在展开的View
private static SwipeMenuLayout mViewCache; //防止多只手指一起滑我的flag 在每次down里判断, touch事件结束清空
private static boolean isTouching; private VelocityTracker mVelocityTracker;//滑动速度变量
private android.util.Log LogUtils; /**
* 右滑删除功能的开关,默认开
*/
private boolean isSwipeEnable; /**
* IOS、QQ式交互,默认开
*/
private boolean isIos; private boolean iosInterceptFlag;//IOS类型下,是否拦截事件的flag /**
* 20160929add 左滑右滑的开关,默认左滑打开菜单
*/
private boolean isLeftSwipe; public SwipeMenuLayout(Context context) {
this(context, null);
} public SwipeMenuLayout(Context context, AttributeSet attrs) {
this(context, attrs, 0);
} public SwipeMenuLayout(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
init(context, attrs, defStyleAttr);
} public boolean isSwipeEnable() {
return isSwipeEnable;
} /**
* 设置侧滑功能开关
*
* @param swipeEnable
*/
public void setSwipeEnable(boolean swipeEnable) {
isSwipeEnable = swipeEnable;
} public boolean isIos() {
return isIos;
} /**
* 设置是否开启IOS阻塞式交互
*
* @param ios
*/
public SwipeMenuLayout setIos(boolean ios) {
isIos = ios;
return this;
} public boolean isLeftSwipe() {
return isLeftSwipe;
} /**
* 设置是否开启左滑出菜单,设置false 为右滑出菜单
*
* @param leftSwipe
* @return
*/
public SwipeMenuLayout setLeftSwipe(boolean leftSwipe) {
isLeftSwipe = leftSwipe;
return this;
} /**
* 返回ViewCache
*
* @return
*/
public static SwipeMenuLayout getViewCache() {
return mViewCache;
} private void init(Context context, AttributeSet attrs, int defStyleAttr) {
mScaleTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop();
mMaxVelocity = ViewConfiguration.get(context).getScaledMaximumFlingVelocity();
//初始化滑动帮助类对象
//mScroller = new Scroller(context); //右滑删除功能的开关,默认开
isSwipeEnable = true;
//IOS、QQ式交互,默认开
isIos = true;
//左滑右滑的开关,默认左滑打开菜单
isLeftSwipe = true;
TypedArray ta = context.getTheme().obtainStyledAttributes(attrs, R.styleable.SwipeMenuLayout, defStyleAttr, 0);
int count = ta.getIndexCount();
for (int i = 0; i < count; i++) {
int attr = ta.getIndex(i);
//如果引用成AndroidLib 资源都不是常量,无法使用switch case
if (attr == R.styleable.SwipeMenuLayout_swipeEnable) {
isSwipeEnable = ta.getBoolean(attr, true);
} else if (attr == R.styleable.SwipeMenuLayout_ios) {
isIos = ta.getBoolean(attr, true);
} else if (attr == R.styleable.SwipeMenuLayout_leftSwipe) {
isLeftSwipe = ta.getBoolean(attr, true);
}
}
ta.recycle(); } @Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
//Log.d(TAG, "onMeasure() called with: " + "widthMeasureSpec = [" + widthMeasureSpec + "], heightMeasureSpec = [" + heightMeasureSpec + "]");
super.onMeasure(widthMeasureSpec, heightMeasureSpec); setClickable(true);//令自己可点击,从而获取触摸事件 mRightMenuWidths = 0;//由于ViewHolder的复用机制,每次这里要手动恢复初始值
mHeight = 0;
int contentWidth = 0;//2016 11 09 add,适配GridLayoutManager,将以第一个子Item(即ContentItem)的宽度为控件宽度
int childCount = getChildCount(); //add by 2016 08 11 为了子View的高,可以matchParent(参考的FrameLayout 和LinearLayout的Horizontal)
final boolean measureMatchParentChildren = MeasureSpec.getMode(heightMeasureSpec) != MeasureSpec.EXACTLY;
boolean isNeedMeasureChildHeight = false; for (int i = 0; i < childCount; i++) {
View childView = getChildAt(i);
//令每一个子View可点击,从而获取触摸事件
childView.setClickable(true);
if (childView.getVisibility() != GONE) {
//后续计划加入上滑、下滑,则将不再支持Item的margin
measureChild(childView, widthMeasureSpec, heightMeasureSpec);
//measureChildWithMargins(childView, widthMeasureSpec, 0, heightMeasureSpec, 0);
final MarginLayoutParams lp = (MarginLayoutParams) childView.getLayoutParams();
mHeight = Math.max(mHeight, childView.getMeasuredHeight()/* + lp.topMargin + lp.bottomMargin*/);
if (measureMatchParentChildren && lp.height == LayoutParams.MATCH_PARENT) {
isNeedMeasureChildHeight = true;
}
if (i > 0) {//第一个布局是Left item,从第二个开始才是RightMenu
mRightMenuWidths += childView.getMeasuredWidth();
} else {
mContentView = childView;
contentWidth = childView.getMeasuredWidth();
}
}
}
setMeasuredDimension(getPaddingLeft() + getPaddingRight() + contentWidth,
mHeight + getPaddingTop() + getPaddingBottom());//宽度取第一个Item(Content)的宽度
mLimit = mRightMenuWidths * 4 / 10;//滑动判断的临界值
//Log.d(TAG, "onMeasure() called with: " + "mRightMenuWidths = [" + mRightMenuWidths);
if (isNeedMeasureChildHeight) {//如果子View的height有MatchParent属性的,设置子View高度
forceUniformHeight(childCount, widthMeasureSpec);
}
} @Override
public LayoutParams generateLayoutParams(AttributeSet attrs) {
return new MarginLayoutParams(getContext(), attrs);
} /**
* 给MatchParent的子View设置高度
*
* @param count
* @param widthMeasureSpec
* @see android.widget.LinearLayout# 同名方法
*/
private void forceUniformHeight(int count, int widthMeasureSpec) {
// Pretend that the linear layout has an exact size. This is the measured height of
// ourselves. The measured height should be the max height of the children, changed
// to accommodate the heightMeasureSpec from the parent
int uniformMeasureSpec = MeasureSpec.makeMeasureSpec(getMeasuredHeight(),
MeasureSpec.EXACTLY);//以父布局高度构建一个Exactly的测量参数
for (int i = 0; i < count; ++i) {
final View child = getChildAt(i);
if (child.getVisibility() != GONE) {
MarginLayoutParams lp = (MarginLayoutParams) child.getLayoutParams();
if (lp.height == LayoutParams.MATCH_PARENT) {
// Temporarily force children to reuse their old measured width
// FIXME: this may not be right for something like wrapping text?
int oldWidth = lp.width;//measureChildWithMargins 这个函数会用到宽,所以要保存一下
lp.width = child.getMeasuredWidth();
// Remeasure with new dimensions
measureChildWithMargins(child, widthMeasureSpec, 0, uniformMeasureSpec, 0);
lp.width = oldWidth;
}
}
}
} @Override
protected void onLayout(boolean changed, int l, int t, int r, int b) {
//LogUtils.e(TAG, "onLayout() called with: " + "changed = [" + changed + "], l = [" + l + "], t = [" + t + "], r = [" + r + "], b = [" + b + "]");
int childCount = getChildCount();
int left = 0 + getPaddingLeft();
int right = 0 + getPaddingLeft();
for (int i = 0; i < childCount; i++) {
View childView = getChildAt(i);
if (childView.getVisibility() != GONE) {
if (i == 0) {//第一个子View是内容 宽度设置为全屏
childView.layout(left, getPaddingTop(), left + childView.getMeasuredWidth(), getPaddingTop() + childView.getMeasuredHeight());
left = left + childView.getMeasuredWidth();
} else {
if (isLeftSwipe) {
childView.layout(left, getPaddingTop(), left + childView.getMeasuredWidth(), getPaddingTop() + childView.getMeasuredHeight());
left = left + childView.getMeasuredWidth();
} else {
childView.layout(right - childView.getMeasuredWidth(), getPaddingTop(), right, getPaddingTop() + childView.getMeasuredHeight());
right = right - childView.getMeasuredWidth();
} }
}
}
//Log.d(TAG, "onLayout() called with: " + "maxScrollGap = [" + maxScrollGap + "], l = [" + l + "], t = [" + t + "], r = [" + r + "], b = [" + b + "]");
} @Override
public boolean dispatchTouchEvent(MotionEvent ev) {
//LogUtils.d(TAG, "dispatchTouchEvent() called with: " + "ev = [" + ev + "]");
if (isSwipeEnable) {
acquireVelocityTracker(ev);
final VelocityTracker verTracker = mVelocityTracker;
switch (ev.getAction()) {
case MotionEvent.ACTION_DOWN:
isUserSwiped = false;//2016 11 03 add,判断手指起始落点,如果距离属于滑动了,就屏蔽一切点击事件。
isUnMoved = true;//2016 10 22 add , 仿QQ,侧滑菜单展开时,点击内容区域,关闭侧滑菜单。
iosInterceptFlag = false;//add by 2016 09 11 ,每次DOWN时,默认是不拦截的
if (isTouching) {//如果有别的指头摸过了,那么就return false。这样后续的move..等事件也不会再来找这个View了。
return false;
} else {
isTouching = true;//第一个摸的指头,赶紧改变标志,宣誓主权。
}
mLastP.set(ev.getRawX(), ev.getRawY());
mFirstP.set(ev.getRawX(), ev.getRawY());//2016 11 03 add,判断手指起始落点,如果距离属于滑动了,就屏蔽一切点击事件。 //如果down,view和cacheview不一样,则立马让它还原。且把它置为null
if (mViewCache != null) {
if (mViewCache != this) {
mViewCache.smoothClose(); iosInterceptFlag = isIos;//add by 2016 09 11 ,IOS模式开启的话,且当前有侧滑菜单的View,且不是自己的,就该拦截事件咯。
}
//只要有一个侧滑菜单处于打开状态, 就不给外层布局上下滑动了
getParent().requestDisallowInterceptTouchEvent(true);
}
//求第一个触点的id, 此时可能有多个触点,但至少一个,计算滑动速率用
mPointerId = ev.getPointerId(0);
break;
case MotionEvent.ACTION_MOVE:
//add by 2016 09 11 ,IOS模式开启的话,且当前有侧滑菜单的View,且不是自己的,就该拦截事件咯。滑动也不该出现
if (iosInterceptFlag) {
break;
}
float gap = mLastP.x - ev.getRawX();
//为了在水平滑动中禁止父类ListView等再竖直滑动
if (Math.abs(gap) > 10 || Math.abs(getScrollX()) > 10) {//2016 09 29 修改此处,使屏蔽父布局滑动更加灵敏,
getParent().requestDisallowInterceptTouchEvent(true);
}
//2016 10 22 add , 仿QQ,侧滑菜单展开时,点击内容区域,关闭侧滑菜单。begin
if (Math.abs(gap) > mScaleTouchSlop) {
isUnMoved = false;
}
//2016 10 22 add , 仿QQ,侧滑菜单展开时,点击内容区域,关闭侧滑菜单。end
//如果scroller还没有滑动结束 停止滑动动画
/* if (!mScroller.isFinished()) {
mScroller.abortAnimation();
}*/
scrollBy((int) (gap), 0);//滑动使用scrollBy
//越界修正
if (isLeftSwipe) {//左滑
if (getScrollX() < 0) {
scrollTo(0, 0);
}
if (getScrollX() > mRightMenuWidths) {
scrollTo(mRightMenuWidths, 0);
}
} else {//右滑
if (getScrollX() < -mRightMenuWidths) {
scrollTo(-mRightMenuWidths, 0);
}
if (getScrollX() > 0) {
scrollTo(0, 0);
}
} mLastP.set(ev.getRawX(), ev.getRawY());
break;
case MotionEvent.ACTION_UP:
case MotionEvent.ACTION_CANCEL:
//2016 11 03 add,判断手指起始落点,如果距离属于滑动了,就屏蔽一切点击事件。
if (Math.abs(ev.getRawX() - mFirstP.x) > mScaleTouchSlop) {
isUserSwiped = true;
} //add by 2016 09 11 ,IOS模式开启的话,且当前有侧滑菜单的View,且不是自己的,就该拦截事件咯。滑动也不该出现
if (!iosInterceptFlag) {//且滑动了 才判断是否要收起、展开menu
//求伪瞬时速度
verTracker.computeCurrentVelocity(1000, mMaxVelocity);
final float velocityX = verTracker.getXVelocity(mPointerId);
if (Math.abs(velocityX) > 1000) {//滑动速度超过阈值
if (velocityX < -1000) {
if (isLeftSwipe) {//左滑
//平滑展开Menu
smoothExpand(); } else {
//平滑关闭Menu
smoothClose();
}
} else {
if (isLeftSwipe) {//左滑
// 平滑关闭Menu
smoothClose();
} else {
//平滑展开Menu
smoothExpand(); }
}
} else {
if (Math.abs(getScrollX()) > mLimit) {//否则就判断滑动距离
//平滑展开Menu
smoothExpand();
} else {
// 平滑关闭Menu
smoothClose();
}
}
}
//释放
releaseVelocityTracker();
//LogUtils.i(TAG, "onTouch A ACTION_UP ACTION_CANCEL:velocityY:" + velocityX);
isTouching = false;//没有手指在摸我了
break;
default:
break;
}
}
return super.dispatchTouchEvent(ev);
} @Override
public boolean onInterceptTouchEvent(MotionEvent ev) {
//Log.d(TAG, "onInterceptTouchEvent() called with: ev = [" + ev + "]");
//add by zhangxutong 2016 12 07 begin:
//禁止侧滑时,点击事件不受干扰。
if (isSwipeEnable) {
switch (ev.getAction()) {
//add by zhangxutong 2016 11 04 begin :
// fix 长按事件和侧滑的冲突。
case MotionEvent.ACTION_MOVE:
//屏蔽滑动时的事件
if (Math.abs(ev.getRawX() - mFirstP.x) > mScaleTouchSlop) {
return true;
}
break;
//add by zhangxutong 2016 11 04 end
case MotionEvent.ACTION_UP:
//为了在侧滑时,屏蔽子View的点击事件
if (isLeftSwipe) {
if (getScrollX() > mScaleTouchSlop) {
//add by 2016 09 10 解决一个智障问题~ 居然不给点击侧滑菜单 我跪着谢罪
//这里判断落点在内容区域屏蔽点击,内容区域外,允许传递事件继续向下的的。。。
if (ev.getX() < getWidth() - getScrollX()) {
//2016 10 22 add , 仿QQ,侧滑菜单展开时,点击内容区域,关闭侧滑菜单。
if (isUnMoved) {
smoothClose();
}
return true;//true表示拦截
}
}
} else {
if (-getScrollX() > mScaleTouchSlop) {
if (ev.getX() > -getScrollX()) {//点击范围在菜单外 屏蔽
//2016 10 22 add , 仿QQ,侧滑菜单展开时,点击内容区域,关闭侧滑菜单。
if (isUnMoved) {
smoothClose();
}
return true;
}
}
}
//add by zhangxutong 2016 11 03 begin:
// 判断手指起始落点,如果距离属于滑动了,就屏蔽一切点击事件。
if (isUserSwiped) {
return true;
}
//add by zhangxutong 2016 11 03 end break;
}
//模仿IOS 点击其他区域关闭:
if (iosInterceptFlag) {
//IOS模式开启,且当前有菜单的View,且不是自己的 拦截点击事件给子View
return true;
}
}
return super.onInterceptTouchEvent(ev);
} /**
* 平滑展开
*/
private ValueAnimator mExpandAnim, mCloseAnim; private boolean isExpand;//代表当前是否是展开状态 2016 11 03 add public void smoothExpand() {
//Log.d(TAG, "smoothExpand() called" + this);
/*mScroller.startScroll(getScrollX(), 0, mRightMenuWidths - getScrollX(), 0);
invalidate();*/
//展开就加入ViewCache:
mViewCache = SwipeMenuLayout.this; //2016 11 13 add 侧滑菜单展开,屏蔽content长按
if (null != mContentView) {
mContentView.setLongClickable(false);
} cancelAnim();
mExpandAnim = ValueAnimator.ofInt(getScrollX(), isLeftSwipe ? mRightMenuWidths : -mRightMenuWidths);
mExpandAnim.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
@Override
public void onAnimationUpdate(ValueAnimator animation) {
scrollTo((Integer) animation.getAnimatedValue(), 0);
}
});
mExpandAnim.setInterpolator(new OvershootInterpolator());
mExpandAnim.addListener(new AnimatorListenerAdapter() {
@Override
public void onAnimationEnd(Animator animation) {
isExpand = true;
}
});
mExpandAnim.setDuration(300).start();
} /**
* 每次执行动画之前都应该先取消之前的动画
*/
private void cancelAnim() {
if (mCloseAnim != null && mCloseAnim.isRunning()) {
mCloseAnim.cancel();
}
if (mExpandAnim != null && mExpandAnim.isRunning()) {
mExpandAnim.cancel();
}
} /**
* 平滑关闭
*/
public void smoothClose() {
//Log.d(TAG, "smoothClose() called" + this);
/* mScroller.startScroll(getScrollX(), 0, -getScrollX(), 0);
invalidate();*/
mViewCache = null; //2016 11 13 add 侧滑菜单展开,屏蔽content长按
if (null != mContentView) {
mContentView.setLongClickable(true);
} cancelAnim();
mCloseAnim = ValueAnimator.ofInt(getScrollX(), 0);
mCloseAnim.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
@Override
public void onAnimationUpdate(ValueAnimator animation) {
scrollTo((Integer) animation.getAnimatedValue(), 0);
}
});
mCloseAnim.setInterpolator(new AccelerateInterpolator());
mCloseAnim.addListener(new AnimatorListenerAdapter() {
@Override
public void onAnimationEnd(Animator animation) {
isExpand = false; }
});
mCloseAnim.setDuration(300).start();
//LogUtils.d(TAG, "smoothClose() called with:getScrollX() " + getScrollX());
} /**
* @param event 向VelocityTracker添加MotionEvent
* @see VelocityTracker#obtain()
* @see VelocityTracker#addMovement(MotionEvent)
*/
private void acquireVelocityTracker(final MotionEvent event) {
if (null == mVelocityTracker) {
mVelocityTracker = VelocityTracker.obtain();
}
mVelocityTracker.addMovement(event);
} /**
* * 释放VelocityTracker
*
* @see VelocityTracker#clear()
* @see VelocityTracker#recycle()
*/
private void releaseVelocityTracker() {
if (null != mVelocityTracker) {
mVelocityTracker.clear();
mVelocityTracker.recycle();
mVelocityTracker = null;
}
} //每次ViewDetach的时候,判断一下 ViewCache是不是自己,如果是自己,关闭侧滑菜单,且ViewCache设置为null,
// 理由:1 防止内存泄漏(ViewCache是一个静态变量)
// 2 侧滑删除后自己后,这个View被Recycler回收,复用,下一个进入屏幕的View的状态应该是普通状态,而不是展开状态。
@Override
protected void onDetachedFromWindow() {
if (this == mViewCache) {
mViewCache.smoothClose();
mViewCache = null;
}
super.onDetachedFromWindow();
} //展开时,禁止长按
@Override
public boolean performLongClick() {
if (Math.abs(getScrollX()) > mScaleTouchSlop) {
return false;
}
return super.performLongClick();
} //平滑滚动 弃用 改属性动画实现
/* @Override
public void computeScroll() {
//判断Scroller是否执行完毕:
if (mScroller.computeScrollOffset()) {
scrollTo(mScroller.getCurrX(), mScroller.getCurrY());
//通知View重绘-invalidate()->onDraw()->computeScroll()
invalidate();
}
}*/ /**
* 快速关闭。
* 用于 点击侧滑菜单上的选项,同时想让它快速关闭(删除 置顶)。
* 这个方法在ListView里是必须调用的,
* 在RecyclerView里,视情况而定,如果是mAdapter.notifyItemRemoved(pos)方法不用调用。
*/
public void quickClose() {
if (this == mViewCache) {
//先取消展开动画
cancelAnim();
mViewCache.scrollTo(0, 0);//关闭
mViewCache = null;
}
} }