概述
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.weixin import android.content.Context import android.content.res.Resources import android.util.AttributeSet import android.util.Log import android.view.MotionEvent import android.view.View import android.view.ViewGroup import androidx.core.view.ViewCompat import androidx.customview.widget.ViewDragHelper import com.example.kotlindemo.R import java.math.BigDecimal class 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_MOVE return 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{ @JvmStatic fun 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.weixin import android.content.Context import android.graphics.Canvas import android.graphics.Color import android.graphics.Paint import android.os.VibrationEffect import android.os.Vibrator import android.util.AttributeSet import android.util.Log import android.view.View import androidx.core.content.ContextCompat import com.example.kotlindemo.MainActivity import com.example.kotlindemo.R class 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() / maxHeight if (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 Vibrator if (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.Color import android.os.Build import android.os.Bundle import android.view.View import android.view.Window import androidx.appcompat.app.AppCompatActivity import androidx.databinding.DataBindingUtil import com.example.kotlindemo.databinding.ActivityMainBinding import com.example.kotlindemo.widget.weixin.ChatSession import com.example.kotlindemo.widget.weixin.ChatSessionAdapter import com.example.kotlindemo.widget.weixin.ViewUtils class 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.layoutParams layoutParams.height=ViewUtils.getStatusBarHeight(resources) binding.statusBar.layoutParams=layoutParams binding.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_FULLSCREEN or 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> <RelativeLayout android: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.WeiXinMainPullViewGroup android:paddingTop="40dp" android:layout_above="@+id/navigation" android:id="@+id/wx_main" android:layout_width="match_parent" android:layout_height="match_parent" > <com.example.kotlindemo.widget.weixin.WeiXinProgram android: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"> <LinearLayout android: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.WeiXinMainLayout android: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"> <TextView android: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> <ImageView android:layout_marginRight="45dp" android:scaleType="center" android:layout_centerVertical="true" android:layout_alignParentRight="true" android:src="@drawable/ic_search" android:layout_width="28dp" android:layout_height="28dp"></ImageView> <ImageView android:layout_marginRight="10dp" android:scaleType="center" android:layout_centerVertical="true" android:layout_alignParentRight="true" android:src="@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:id="@+id/chat_list" 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:id="@+id/navigation" android:layout_alignParentBottom="true" android:layout_width="match_parent" android:layout_height="60dp"> </LinearLayout> <View android:background="@color/navigation_color" android:id="@+id/status_bar" android:layout_width="match_parent" android:layout_height="100dp"></View> </RelativeLayout> </layout>
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