仿这个写的
image.png
布局文件
底部的子类，通过设置marginbottom为负的高度，使其不可见
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="wrap_content">
<RelativeLayout
android:id="@+id/layout_top"
android:layout_width="match_parent"
android:layout_height="150dp">
<ImageView
android:id="@+id/iv_bg"
android:src="@mipmap/pic11"
android:scaleType="centerCrop"
android:layout_width="match_parent"
android:layout_height="300dp" />
<View
android:id="@+id/view_mask"
android:alpha="0.5"
android:layout_centerInParent="true"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
<CheckBox
android:id="@+id/cb"
android:clickable="false"
android:layout_centerVertical="true"
android:layout_marginLeft="30dp"
android:layout_width="30dp"
android:layout_height="30dp" />
<TextView
android:id="@+id/tv_type"
android:text="type"
android:layout_centerInParent="true"
android:layout_width="60dp"
android:gravity="center"
android:textColor="#fff"
android:layout_height="25dp" />
<TextView
android:id="@+id/tv_expand"
android:text="expand"
android:gravity="center"
android:textColor="#fff"
android:padding="10dp"
android:layout_centerHorizontal="true"
android:layout_below="@+id/tv_type"
android:layout_marginTop="10dp"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</RelativeLayout>
<FrameLayout
android:id="@+id/layout_expand"
android:layout_width="match_parent"
android:layout_marginBottom="-50dp"
android:layout_height="50dp">
<android.support.v7.widget.RecyclerView
android:id="@+id/rv_sub_types"
android:layout_gravity="center"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
</FrameLayout>
</LinearLayout>
实体类
data class FlipSettingBean(var type:String,var subTypes: ArrayList<String>?,var colorStr:String,var expanded:Boolean=false,var checked:Boolean=true)
代码文件
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_flip_board_setting)
setSupportActionBar(toolbar)
supportActionBar?.apply {
setTitle("flip board setting")
setDisplayHomeAsUpEnabled(true)
}
initRvDatas()
initRv()
}
var screenWidht=0
var datas= arrayListOf<FlipSettingBean>()
var subTypes= arrayListOf<String>("头条","图片","社会","国际","国内")
private fun initRvDatas() {
screenWidht=windowManager.defaultDisplay.width
datas.add(FlipSettingBean("news",subTypes,"#ff0000"))
datas.add(FlipSettingBean("business",subTypes,"#647464"))
datas.add(FlipSettingBean("technology",subTypes,"#7575be"))
datas.add(FlipSettingBean("sports",subTypes,"#30ceac"))
datas.add(FlipSettingBean("video",subTypes,"#E7D50E"))
datas.add(FlipSettingBean("fashion",subTypes,"#2283BF"))
datas.add(FlipSettingBean("foods",subTypes,"#FFAEB9AE"))
datas.add(FlipSettingBean("travel",subTypes,"#FFA58DBC"))
datas.add(FlipSettingBean("recreation",subTypes,"#FFF4A34C"))
datas.add(FlipSettingBean("science",subTypes,"#FFFA4582"))
}
private fun initRv(){
rv.apply {
layoutManager=LinearLayoutManager(this@ActivityFlipBoardSetting)
adapter=object :BaseRvAdapter<FlipSettingBean>(datas){
override fun getLayoutID(viewType: Int): Int {
return R.layout.item_flip_setting
}
var mSharedPool = RecyclerView.RecycledViewPool()
override fun onBindViewHolder(holder: BaseRvHolder, position: Int) {
var data=getItemData(position)
var color=Color.parseColor(data.colorStr)
holder.getView<TextView>(R.id.tv_type).apply {
text=data.type
if(data.checked){
setBackgroundResource(R.drawable.shape_white_stoke)
}else{
setBackgroundColor(color)
}
}
holder.getView<CheckBox>(R.id.cb).isChecked=data.checked
holder.getView<View>(R.id.layout_expand).apply {
visibility=if(data.expanded) View.VISIBLE else View.GONE
setBackgroundColor(color)
}
holder.getView<View>(R.id.view_mask).apply {
setBackgroundColor(color)
visibility=if(data.checked)View.VISIBLE else View.GONE //蒙版的可见性修改
}
holder.getView<TextView>(R.id.tv_expand).apply {
text=if(data.expanded) "collpse" else "expand"
setOnClickListener {
data.expanded=!data.expanded
text=if(data.expanded) "collpse" else "expand"
//底部的通过动画来修改bottomMargin实现动态展开的效果
holder.getView<View>(R.id.layout_expand).apply {
var anim=ValueAnimator.ofInt(0,-50)
if(data.expanded){
anim=ValueAnimator.ofInt(-50,0)
visibility=View.VISIBLE
}
anim.setDuration(200)
anim.start()
anim.addUpdateListener {
holder.getView<View>(R.id.layout_expand).apply {
var params=layoutParams as LinearLayout.LayoutParams
params.bottomMargin=it.animatedValue as Int
layoutParams=params
}
}
}
}
}
holder.getView<View>(R.id.layout_top).setOnClickListener {
data.checked=!data.checked
holder.getView<CheckBox>(R.id.cb).isChecked=data.checked
//展开的子类布局收缩
holder.getView<View>(R.id.layout_expand).apply {
var params=layoutParams as LinearLayout.LayoutParams
params.bottomMargin=-50
layoutParams=params
}
//文字修改
data.expanded=false
holder.getView<TextView>(R.id.tv_expand).text="expand"
//取消旧的动画
with( holder.getView<View>(R.id.view_mask)){
if(animation!=null){
animation.cancel()
}
}
//开启动画
var samll=0.1f
var big=1f
var scaleAnim=ScaleAnimation(1f,60f/screenWidht,1f,25f/150,Animation.RELATIVE_TO_SELF,0.5f,Animation.RELATIVE_TO_SELF,0.5f)
if(data.checked){
scaleAnim=ScaleAnimation(60f/screenWidht,1f,25f/150,1f,Animation.RELATIVE_TO_SELF,0.5f,Animation.RELATIVE_TO_SELF,0.5f)
}
scaleAnim.duration=200
scaleAnim.setAnimationListener(object :Animation.AnimationListener{
override fun onAnimationRepeat(animation: Animation?) {
}
override fun onAnimationEnd(animation: Animation?) {
holder.getView<View>(R.id.view_mask).visibility=if(data.checked)View.VISIBLE else View.GONE
holder.getView<TextView>(R.id.tv_type).apply {
if(data.checked){
}else{
setBackgroundColor(color)
}
}
}
override fun onAnimationStart(animation: Animation?) {
holder.getView<TextView>(R.id.tv_expand).visibility=if(data.checked)View.VISIBLE else View.GONE
holder.getView<TextView>(R.id.tv_type).apply {
if(data.checked){
setBackgroundResource(R.drawable.shape_white_stoke)
}
}
}
})
holder.getView<View>(R.id.view_mask).startAnimation( scaleAnim)
holder.getView<View>(R.id.view_mask).visibility=View.VISIBLE
}
holder.getView<RecyclerView>(R.id.rv_sub_types).apply {
recycledViewPool=mSharedPool
if(adapter==null){
layoutManager=LinearLayoutManager(context,LinearLayoutManager.HORIZONTAL,false).apply {
recycleChildrenOnDetach=true
}
addItemDecoration(object :RecyclerView.ItemDecoration(){
override fun getItemOffsets(outRect: Rect, view: View, parent: RecyclerView, state: RecyclerView.State?) {
outRect.right=11
}
})
adapter=object :BaseRvAdapter<String>(data.subTypes){
override fun getLayoutID(viewType: Int): Int {
return R.layout.item_flip_sub_type
}
override fun onBindViewHolder(holder: BaseRvHolder, p: Int) {
holder.setText(R.id.tv_sub_type,getItemData(p)+":$position")
}
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): BaseRvHolder {
return super.onCreateViewHolder(parent, viewType)
}
}
}else{
(adapter as BaseRvAdapter<String>).initData(data.subTypes!!)
}
}
}
}
}
}
简单分析下，展开收缩的时候，开启一个动画，修改底部控件的marginBottom来实现平滑出现的效果
整体点击的时候就是对蒙版view进行一个scale的动画。
