android后台管理界面demo（Android技术分享Android）

*以上图片截自微信等待中界面

上图是微信多人视频通话时未接通的界面状态，可见每个人的 View 中大致需包含了以下元素。

0. 头像
1. 昵称
2. Loading View
3. 视频 View
4. 音频状态 icon

所以，我们先写好每个人的布局。如下

<merge xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" xmlns:app="http://schemas.android.com/apk/res-auto" android:layout_width="match_parent" android:layout_height="match_parent" android:background="#2C3033" tools:parentTag="android.widget.RelativeLayout"> <!--视频View--> <TextureView android:id="@ id/video_view" android:layout_height="match_parent" android:layout_width="match_parent"> </TextureView> <!--头像--> <ImageView android:id="@ id/iv_avatar" android:src="@drawable/avatar" android:layout_height="match_parent" android:layout_width="match_parent"> </ImageView> <!--名字--> <TextView android:id="@ id/tv_user_name" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentBottom="true" android:layout_margin="20dp" tools:text="UserName" android:background="@android:color/transparent" android:textColor="@android:color/white" android:textSize="14sp" /> <!--音频状态Icon--> <ImageView android:id="@ id/iv_audio_enable" android:layout_height="20dp" android:layout_width="20dp" android:layout_alignParentRight="true" android:layout_alignParentBottom="true" android:layout_margin="20dp" android:src="@drawable/mic_enable"> </ImageView> <!--Loading--> <ImageView android:id="@ id/iv_loading" android:layout_height="30dp" android:layout_width="30dp" android:layout_centerInParent="true" android:src="@drawable/loading"> </ImageView> </merge>

接着定义自定义View类，GroupUserVideoLayout 添加一些基本的方法。

/** * 多人视频通话中每个用户的布局 */ class GroupUserVideoLayout @JvmOverloads constructor(mContext:Context): RelativeLayout(mContext) { private var videoView:TextureView private var ivAvatar:ImageView private var ivAudio:ImageView private var tvName:TextView private var ivLoading:ImageView init { val root = LayoutInflater.from(mContext).inflate(R.layout.layout_gv_layout,this) videoView = root.findViewById(R.id.video_view) ivAvatar = root.findViewById(R.id.iv_avatar) ivAudio = root.findViewById(R.id.iv_audio_enable) tvName = root.findViewById(R.id.tv_user_name) ivLoading = root.findViewById(R.id.iv_loading) } //设置昵称 fun setUserName(userName:String){ tvName.text = userName } //设置头像 fun setAvatar(avatarUrl:String){ ivAvatar.loadUrl(avatarUrl) } //设置音频图标状态 fun enableAudio(enable:Boolean){ ivAudio.visibility = if (enable) VISIBLE else GONE } //设置LoadingView状态 fun setLoadingState(open:Boolean){ ivLoading.visibility = if (open) VISIBLE else GONE } }

接听后，对应的设置每个人的头像昵称，去掉 Loading，显示视频。接下来就是要定义多个人进出时，布局的变化了。

- 2个人的时候，左右对齐均分显示 - 3个人的时候品字型显示 - 4个人的时候上下2个均分显示 - 5个人以上则九宫格显示

定义 GroupVideoLayoutManager ，这个是在外部直接使用的，里面应当有查找、添加用户，移除用户，根据人数更新布局位置等功能。

class GroupVideoLayoutManager constructor(mContext: Context): RelativeLayout(mContext) { //自己的ID var selfId:String="" private val userLayoutList = mutableListOf<LayoutEntity>() private var userCount = 0 private val MAX_USER = 8 private val oneUserParamList by lazy { LayoutUtils.get1UserParam(mContext,width,height) } private val twoUserParamList by lazy { LayoutUtils.get2UserParam(mContext,width,height) } private val threeUserParamList by lazy { LayoutUtils.get3UserParam(mContext,width,height) } private val fourUserParamList by lazy { LayoutUtils.get4UserParam(mContext,width,height) } private val nineUserParamList by lazy { LayoutUtils.get9UserParam(mContext,width,height) } /** * 根据uid 查找对应的View */ fun findUser(uid:String):GroupUserVideoLayout?{ userLayoutList.find { it.userId==uid }?.let { layoutEntity-> layoutEntity.layout?.let { return it }?:let{ return null } }?:let{ return null } } /** * 根据uid 添加对应的View */ fun addUser(uid:String):GroupUserVideoLayout?{ if (userCount>MAX_USER){ return null } val layout = GroupUserVideoLayout(context) userLayoutList.add(LayoutEntity(layout,uid)) userCount post { updateLayout() } return layout } /** * 根据uid 移除对应View */ fun removeUser(uid:String){ userLayoutList.find { it.userId==uid }?.let { userLayoutList.remove(it) userCount-- } } //更新布局位置 private fun updateLayout(){ if (userLayoutList.isNullOrEmpty()){ return } val paramsList:ArrayList<LayoutParams> when(userCount){ 1->{ paramsList = oneUserParamList userLayoutList[0].layout?.layoutParams = paramsList[0] return } 2->{ paramsList = twoUserParamList } 3->{ paramsList = threeUserParamList } 4->{ paramsList = fourUserParamList } else->{ paramsList = nineUserParamList } } var layoutIndex = if (selfId.isEmpty()) 0 else 1 userLayoutList.forEach { if (it.userId == selfId){ it.layout?.layoutParams = paramsList[0] }else if (layoutIndex<paramsList.size){ it.layout?.layoutParams = paramsList[layoutIndex ] } } } private inner class LayoutEntity { var layout: GroupUserVideoLayout? = null var userId = "" constructor(layout: GroupUserVideoLayout?, userId: String) { this.layout = layout this.userId = userId } } override fun onMeasure(widthMeasureSpec: Int, heightMeasureSpec: Int) { val widthSize = MeasureSpec.getSize(widthMeasureSpec) val heightSize = MeasureSpec.getSize(heightMeasureSpec) if (widthSize == 0 && heightSize == 0) { super.onMeasure(widthMeasureSpec, heightMeasureSpec) val minSize = Math.min(measuredWidth, measuredHeight) setMeasuredDimension(minSize, minSize) return } val size: Int size = if (widthSize == 0 || heightSize == 0) { Math.max(widthSize, heightSize) } else { Math.min(widthSize, heightSize) } val newMeasureSpec = MeasureSpec.makeMeasureSpec(size, MeasureSpec.EXACTLY) super.onMeasure(newMeasureSpec, newMeasureSpec) } }

以上就实现了类似微信视频通话界面的自定义View，具体使用效果会在下一期的文章所介绍的demo中体现～敬请期待！