Android 仿微信小程序入口动画

目录效果对比流程分析自定义ViewGroup小程序缩放比例值计算动画遮罩MainActivity效果对比

微信原版

仿照效果

流程分析自定义ViewGroup

整个布局是通过自定义ViewGroup来管理的，在自定义ViewGroup中，子布局一共有两个，一个是小程序布局，一个是会话列表布局，然后按照上下分别摆放就可以了。

package com.example.kotlindemo.widget.weixinimport android.content.Contextimport android.content.res.Resourcesimport android.util.AttributeSetimport android.util.Logimport android.view.MotionEventimport android.view.Viewimport android.view.ViewGroupimport androidx.core.view.ViewCompatimport androidx.customview.widget.ViewDragHelperimport com.example.kotlindemo.Rimport java.math.BigDecimalclass WeiXinMainPullViewGroup @JvmOverloads constructor( context: Context?, attrs: AttributeSet? = null, defStyleAttr: Int = 0) : ViewGroup(context, attrs, defStyleAttr) { public var viewDragHelper: ViewDragHelper = ViewDragHelper.create(this, 0.5f, DragHandler()); var headerMaskView: WeiXinPullHeaderMaskView? = null var isOpen: Boolean = false; val NAVIGAATION_HEIGHT = 100 init { } override fun onLayout(changed: Boolean, l: Int, t: Int, r: Int, b: Int) {for (index in 0 until childCount) { if (getChildAt(index) != headerMaskView) {getChildAt(index).layout(l, paddingTop, r, b) }} } override fun computeScroll() {if (viewDragHelper.continueSettling(true)) { ViewCompat.postInvalidateOnAnimation(this);} } override fun onInterceptTouchEvent(ev: MotionEvent): Boolean {Log.i('TAG', 'onInterceptTouchEvent: ${ev.action}')MotionEvent.ACTION_MOVEreturn true } override fun onTouchEvent(event: MotionEvent): Boolean {viewDragHelper.processTouchEvent(event)return true } override fun onMeasure(widthMeasureSpec: Int, heightMeasureSpec: Int) {super.onMeasure(widthMeasureSpec, heightMeasureSpec)measureChildren(widthMeasureSpec, heightMeasureSpec) } fun createMaskView() {if (headerMaskView == null) { headerMaskView = WeiXinPullHeaderMaskView(context, null, 0) addView(headerMaskView)} } inner class DragHandler : ViewDragHelper.Callback() {override fun tryCaptureView(child: View, pointerId: Int): Boolean { return child is WeiXinMainLayout;}override fun onViewDragStateChanged(state: Int) { super.onViewDragStateChanged(state)}/** * 设置进度，设置遮罩layout */override fun onViewPositionChanged( changedView: View, left: Int, top: Int, dx: Int, dy: Int) { createMaskView(); var programView = getChildAt(0) var divide = BigDecimal(top.toString()).divide(BigDecimal(measuredHeight - NAVIGAATION_HEIGHT),4,BigDecimal.ROUND_HALF_UP ) divide = divide.multiply(BigDecimal('100')) divide = divide.multiply(BigDecimal('0.002')) divide = divide.add(BigDecimal('0.8')) if (!isOpen) {programView.scaleX = divide.toFloat()programView.scaleY = divide.toFloat() } else {programView.top = paddingTop + (-((measuredHeight - NAVIGAATION_HEIGHT) - top)) } headerMaskView!!.maxHeight = measuredHeight / 3 headerMaskView!!.layout(0, paddingTop, measuredWidth, top) headerMaskView!!.setProgress(top.toFloat() / ((measuredHeight - (NAVIGAATION_HEIGHT + paddingTop)) / 3) * 100,measuredHeight - (NAVIGAATION_HEIGHT + paddingTop) ) if (top == paddingTop) {isOpen = false } if (top == measuredHeight - NAVIGAATION_HEIGHT) {isOpen = true }}override fun onViewCaptured(capturedChild: View, activePointerId: Int) { super.onViewCaptured(capturedChild, activePointerId) var programView = getChildAt(0) programView.top = paddingTop;}/** * 释放 */override fun onViewReleased(releasedChild: View, xvel: Float, yvel: Float) { /** * 如果已经打开或者释放后小于屏幕三分之一，回到原位 */ if (isOpen or (releasedChild.top + paddingTop <= measuredHeight / 3)) {viewDragHelper.smoothSlideViewTo(releasedChild, 0, paddingTop);ViewCompat.postInvalidateOnAnimation(this@WeiXinMainPullViewGroup);return } viewDragHelper.smoothSlideViewTo(releasedChild, 0, measuredHeight - NAVIGAATION_HEIGHT); ViewCompat.postInvalidateOnAnimation(this@WeiXinMainPullViewGroup);}override fun clampViewPositionVertical(child: View, top: Int, dy: Int): Int { if (top <= paddingTop) {return paddingTop } return (child.top + dy / 1.3).toInt();} }}

还要增加一个用来填充状态栏的View，他的高度是动态获取的，整体布局是RelativeLayout，因为可以方便的设置中间View在状态下面和在导航栏上面。

class ViewUtils { companion object{@JvmStaticfun getStatusBarHeight(resources: Resources): Int { var result = 0 val resourceId = resources.getIdentifier('status_bar_height', 'dimen', 'android') if (resourceId > 0) {result = resources.getDimensionPixelSize(resourceId) } return result} }}小程序缩放比例值计算

然后要做的就是拖动View，可以借助ViewDragHelper来完成，当拖动会话布局的时候，小程序的布局开始做一个缩放比例动画，这个缩放值我在这是这样做的，因为不可能是从0开始，要从一个基础值开始，这个基础值就是0.8，那么剩下0.2的缩放值，就是从开始下拉算起，到整体的高度的百分比。

比如屏幕高度是1000，下拉到500的时候，那么这个缩放值就是0.1，在加上基础值0.8，计算方式如下，整体高度还要减去导航栏的高度。

var divide = BigDecimal(top.toString()).divide(BigDecimal(measuredHeight-NAVIGAATION_HEIGHT), 4, BigDecimal.ROUND_HALF_UP) divide = divide.multiply(BigDecimal('100')) divide = divide.multiply(BigDecimal('0.002' )) divide = divide.add(BigDecimal('0.8')) if (!isOpen) { programView.scaleX = divide.toFloat() programView.scaleY = divide.toFloat() } else { programView.top = paddingTop + (-((measuredHeight - NAVIGAATION_HEIGHT) - top)) }

这里就注意细节了，下拉的时候，小程序布局是通过缩放呈现的，但是上滑关闭的时，小程序布局是和会话布局同时向上走的。

动画遮罩

这是比较麻烦的一步，就是绘制进度动画，也就是那三个圆点。

这个原点有三种状态，一是出现时从小到大，二是到一定大小后，分离出两个固定大小的圆，但是这两个圆比此时中间的要小，并且和下拉进度慢慢向两边扩撒，三是中间的圆开始缩小，直到和其余两个圈同等大小。

这里就要另一波细节了，当还在屏幕的三分之一下拉时，这个头部遮罩布局整体还是不透明的，但是到屏幕的三分之一时，这个布局的透明度开始从255到0运动。并且到达三分之一的时候，还要振动一下，并且只要振动过了，那么在手指未松开时，再次到达屏幕的三分之一时，不会产生振动。

还有一波细节，状态栏由于使用了View填充，所以，从屏幕三份之一后开始，这个View的透明度也要从255-0开始运动。

完整代码如下。

package com.example.kotlindemo.widget.weixinimport android.content.Contextimport android.graphics.Canvasimport android.graphics.Colorimport android.graphics.Paintimport android.os.VibrationEffectimport android.os.Vibratorimport android.util.AttributeSetimport android.util.Logimport android.view.Viewimport androidx.core.content.ContextCompatimport com.example.kotlindemo.MainActivityimport com.example.kotlindemo.Rclass WeiXinPullHeaderMaskView @JvmOverloads constructor( context: Context?, attrs: AttributeSet?, defStyleAttr: Int) : View(context, attrs, defStyleAttr) { var isVibrator: Boolean = false; var progress: Int = 0; var maxHeight: Int = 0; private val CIRCLE_MAX_SIZE = 32; var parentHeight=0; var paint = Paint() private val DEFAULT_CIRCLE_SIZE=8f; init {setBackgroundColor(Color.argb(255 , 239, 239, 239))paint.alpha=255;paint.color = ContextCompat.getColor(context!!, R.color.circleColor)paint.isAntiAlias = true; } override fun onDraw(canvas: Canvas) {super.onDraw(canvas)var value = height.toFloat() / maxHeightif (height <= maxHeight / 2) { canvas.drawCircle((width / 2).toFloat(), (height / 2).toFloat(), CIRCLE_MAX_SIZE * value, paint)} else { if (progress<100){ var diff = (value - 0.5f) * CIRCLE_MAX_SIZE canvas.drawCircle(((width / 2).toFloat()-((0.4f-value)*100)), (height / 2).toFloat(), DEFAULT_CIRCLE_SIZE, paint) canvas.drawCircle(((width / 2).toFloat()+((0.4f-value)*100)), (height / 2).toFloat(), DEFAULT_CIRCLE_SIZE, paint) if ((CIRCLE_MAX_SIZE * 0.5f) - diff<=DEFAULT_CIRCLE_SIZE){ canvas.drawCircle((width / 2).toFloat(), (height / 2).toFloat(), DEFAULT_CIRCLE_SIZE, paint) }else{ canvas.drawCircle((width / 2).toFloat(), (height / 2).toFloat(), (CIRCLE_MAX_SIZE * 0.5f) - diff, paint) } }else{ paint.alpha=getAlphaValue(); canvas.drawCircle((width / 2).toFloat(), (height / 2).toFloat(), DEFAULT_CIRCLE_SIZE, paint) canvas.drawCircle((width / 2).toFloat()-((0.4f)*100), (height / 2).toFloat(), DEFAULT_CIRCLE_SIZE, paint) canvas.drawCircle((width / 2).toFloat()+(((0.4f)*100)), (height / 2).toFloat(), DEFAULT_CIRCLE_SIZE, paint) }} } private fun getAlphaValue():Int{val dc=parentHeight/3-ViewUtils.getStatusBarHeight(resources);val alpha=((height).toFloat()-dc)/(parentHeight-(dc)) return 255-(255*alpha).toInt() } private fun vibrator() {var vibrator = context.getSystemService(Context.VIBRATOR_SERVICE) as Vibratorif (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.O) { var createOneShot = VibrationEffect.createOneShot(7, 255) vibrator.vibrate(createOneShot)} else { vibrator.vibrate(7)} } fun setProgress(value: Float,parentHeight:Int) {this.progress = value.toInt();this.parentHeight=parentHeight;if (value >= 100 && !isVibrator) { vibrator() isVibrator = true;}if (value < 100) { isVibrator = false;}if (progress>=100){ setBackgroundColor(Color.argb(getAlphaValue() , 239, 239, 239)) var mainActivity = context as MainActivity mainActivity.changeStatusBackgroundAlphaValue(getAlphaValue())}else{ setBackgroundColor(Color.argb(255, 239, 239, 239))}invalidate() }}

还有就是这三个原点是始终位于遮罩View中间的，绘制的时候只需要在中间绘制，遮罩View的高度会被外界View所更改。

MainActivity

import android.graphics.Colorimport android.os.Buildimport android.os.Bundleimport android.view.Viewimport android.view.Windowimport androidx.appcompat.app.AppCompatActivityimport androidx.databinding.DataBindingUtilimport com.example.kotlindemo.databinding.ActivityMainBindingimport com.example.kotlindemo.widget.weixin.ChatSessionimport com.example.kotlindemo.widget.weixin.ChatSessionAdapterimport com.example.kotlindemo.widget.weixin.ViewUtilsclass MainActivity : AppCompatActivity() { lateinit var binding: ActivityMainBinding; fun changeStatusBackgroundAlphaValue(value: Int){binding.statusBar.setBackgroundColor(Color.argb(value, 239, 239, 239)) } override fun onCreate(savedInstanceState: Bundle?) {super.onCreate(savedInstanceState)binding = DataBindingUtil.setContentView<ActivityMainBinding>(this, R.layout.activity_main);var layoutParams = binding.statusBar.layoutParamslayoutParams.height=ViewUtils.getStatusBarHeight(resources)binding.statusBar.layoutParams=layoutParamsbinding.wxMain.setPadding(0, ViewUtils.getStatusBarHeight(resources), 0, 0)if (Build.VERSION.SDK_INT >= 21) { val window: Window = window window.getDecorView().setSystemUiVisibility(View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREENor View.SYSTEM_UI_FLAG_LAYOUT_STABLE or View.SYSTEM_UI_FLAG_LIGHT_STATUS_BAR ) window.setStatusBarColor(Color.TRANSPARENT)}val chatSessions= mutableListOf<ChatSession>()for (index in 0 .. 10){ chatSessions.add(ChatSession('https://img2.baidu.com/it/u=3538084390,1079314259&fm=26&fmt=auto&gp=0.jpg','马云','你来，我把公司给你','上午')) chatSessions.add(ChatSession('https://img0.baidu.com/it/u=273576249,1042072491&fm=26&fmt=auto&gp=0.jpg','奥巴马','哥哥在哪呢','上午')) chatSessions.add(ChatSession('https://img1.baidu.com/it/u=152902017,4157746361&fm=11&fmt=auto&gp=0.jpg','成龙','马上接你','上午')) chatSessions.add(ChatSession('https://img0.baidu.com/it/u=3789809038,289359647&fm=26&fmt=auto&gp=0.jpg','窃瓦辛格','我教你啊','上午'))}binding.chatList.adapter=ChatSessionAdapter(chatSessions,this) }}

<?xml version='1.0' encoding='utf-8'?><layout xmlns:android='http://schemas.android.com/apk/res/android' xmlns:app='http://schemas.android.com/apk/res-auto' xmlns:tools='http://schemas.android.com/tools'> <data> </data> <RelativeLayoutandroid:background='@drawable/program_background'android:layout_width='match_parent'android:layout_height='match_parent'android:orientation='vertical'tools:context='.MainActivity'><com.example.kotlindemo.widget.weixin.WeiXinMainPullViewGroupandroid:paddingTop='40dp' android:layout_above='@+id/navigation' android: android:layout_width='match_parent' android:layout_height='match_parent' > <com.example.kotlindemo.widget.weixin.WeiXinProgramandroid:paddingLeft='30dp'android:paddingRight='30dp'android:orientation='vertical'android:layout_width='match_parent'android:layout_height='match_parent'><TextView android:textSize='17sp' android:textColor='#C8C8C8' android:gravity='center' android:text='最近' android:layout_width='match_parent' android:layout_height='40dp'></TextView><androidx.cardview.widget.CardView android:background='#424459' app:cardBackgroundColor='#424459' app:cardElevation='0dp' app:cardCornerRadius='8dp' android:layout_width='match_parent' android:layout_height='46dp'> <LinearLayoutandroid:gravity='center'android:layout_width='match_parent'android:layout_height='match_parent'><TextView android:textSize='15sp' android:textColor='#C8C8C8' android:text='搜索小程序' android:gravity='center' android:layout_width='wrap_content' android:layout_height='wrap_content'></TextView> </LinearLayout></androidx.cardview.widget.CardView><com.example.kotlindemo.widget.weixin.ProgramGridLayout android:layout_marginTop='20dp' android:layout_width='match_parent' android:layout_height='wrap_content'></com.example.kotlindemo.widget.weixin.ProgramGridLayout><com.example.kotlindemo.widget.weixin.ProgramGridLayout android:layout_marginTop='20dp' android:layout_width='match_parent' android:layout_height='wrap_content'></com.example.kotlindemo.widget.weixin.ProgramGridLayout> </com.example.kotlindemo.widget.weixin.WeiXinProgram> <com.example.kotlindemo.widget.weixin.WeiXinMainLayoutandroid:layout_width='match_parent'android:layout_height='match_parent'android:orientation='vertical'><RelativeLayout android:layout_width='match_parent' android:layout_height='44dp' android:background='@color/navigation_color'> <TextViewandroid:textStyle='bold'android:textSize='16sp'android:textColor='#000000'android:layout_centerInParent='true'android:gravity='center'android:text='微信(323)'android:layout_width='wrap_content'android:layout_height='match_parent'></TextView> <ImageViewandroid:layout_marginRight='45dp'android:scaleType='center'android:layout_centerVertical='true'android:layout_alignParentRight='true'android:src='https://www.haobala.com/bcjs/@drawable/ic_search'android:layout_width='28dp'android:layout_height='28dp'></ImageView> <ImageViewandroid:layout_marginRight='10dp'android:scaleType='center'android:layout_centerVertical='true'android:layout_alignParentRight='true'android:src='https://www.haobala.com/bcjs/@drawable/ic_add'android:layout_width='28dp'android:layout_height='28dp'> </ImageView></RelativeLayout><com.example.kotlindemo.widget.weixin.WeiXinChatSessionListView android:paddingLeft='15dp' android:paddingRight='15dp' android:dividerHeight='10dp' android: android:background='#FBFAFA' android:layout_width='match_parent' android:layout_height='match_parent'></com.example.kotlindemo.widget.weixin.WeiXinChatSessionListView> </com.example.kotlindemo.widget.weixin.WeiXinMainLayout></com.example.kotlindemo.widget.weixin.WeiXinMainPullViewGroup><LinearLayout android:background='@color/navigation_color' android:orientation='vertical' android: android:layout_alignParentBottom='true' android:layout_width='match_parent' android:layout_height='60dp'></LinearLayout><View android:background='@color/navigation_color' android: android:layout_width='match_parent' android:layout_height='100dp'></View> </RelativeLayout></layout>

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