简介、音标

.idea/misc.xml

@@ -53,6 +53,8 @@
         <entry key="..\:/Work/XKL/XKL/XklLocal/app/src/main/res/layout/content_learn_base.xml" value="0.4979166666666667" />
         <entry key="..\:/Work/XKL/XKL/XklLocal/app/src/main/res/layout/dialog_bottom_auto_play_select.xml" value="0.4979166666666667" />
         <entry key="..\:/Work/XKL/XKL/XklLocal/app/src/main/res/layout/dialog_bottom_course_more.xml" value="0.33" />
+        <entry key="..\:/Work/XKL/XKL/XklLocal/app/src/main/res/layout/dialog_bottom_course_pack_introducation.xml" value="0.1956521739130435" />
+        <entry key="..\:/Work/XKL/XKL/XklLocal/app/src/main/res/layout/dialog_bottom_course_pack_introduction.xml" value="0.21203703703703702" />
         <entry key="..\:/Work/XKL/XKL/XklLocal/app/src/main/res/layout/dialog_common.xml" value="0.30978260869565216" />
         <entry key="..\:/Work/XKL/XKL/XklLocal/app/src/main/res/layout/dialog_item_select_repeat.xml" value="0.4979166666666667" />
         <entry key="..\:/Work/XKL/XKL/XklLocal/app/src/main/res/layout/dialog_lesson_learn.xml" value="0.4144927536231884" />

ProjectErrors.md

@@ -48,4 +48,8 @@ google 给与的唯一标识符最佳做法：
 如何实现防快速点击 aspectJ
 
 SpellTipsLinearLayout onDraw为什么不调用?为什么设置背景后就有效过了?
-
+实现dialog动画：从底部进入和从底部滑出
+DialogFragment原理
+BottomSheetDialog 固定高度和原理
+BottomSheetDialog中使用TextView滑动的冲突？
+Behavior

app/src/main/java/com/xkl/cdl/Extension.kt

@@ -22,43 +22,52 @@ import com.xkl.cdl.databinding.IncWordDetailBinding
  * @param refrence String? 参考
  */
 @SuppressLint("SetTextI18n")
-fun IncWordDetailBinding.initValue(phrase : String?, example : String?, refrence : String?){
-    phrase?.let {
-        tvPhraseFlag.visibility = View.VISIBLE
-        layoutPhrase.run {
-            visibility = View.VISIBLE
-            removeAllViews()
-            val params = LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT)
-            it.split("\n").forEach {
-                val child = TextView(context).apply {
-                    layoutParams = params
-                    text = it
-                    setTextColor(ContextCompat.getColor(context, R.color.main_text_color))
-                    setTextSize(TypedValue.COMPLEX_UNIT_DIP, 14f)
+fun IncWordDetailBinding.initValue(phrase : String?, example : String?, refrence : String?) {
+    when{
+        phrase.isNullOrEmpty() ->  {
+            tvPhraseFlag.visibility = View.GONE
+            layoutPhrase.visibility = View.GONE
+        }
+        else ->  phrase.let {
+            tvPhraseFlag.visibility = View.VISIBLE
+            layoutPhrase.run {
+                visibility = View.VISIBLE
+                removeAllViews()
+                val params = LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT,
+                                                       LinearLayout.LayoutParams.WRAP_CONTENT)
+                it.split("\n").forEach {
+                    val child = TextView(context).apply {
+                        layoutParams = params
+                        text = it
+                        setTextColor(ContextCompat.getColor(context, R.color.main_text_color))
+                        setTextSize(TypedValue.COMPLEX_UNIT_DIP, 14f)
+                    }
+                    addView(child)
                 }
-                addView(child)
             }
         }
-    }?:let {
-        tvPhraseFlag.visibility = View.GONE
-        layoutPhrase.visibility = View.GONE
     }
     
-    example?.let {
-        tvExampleFlag.visibility = View.VISIBLE
-        tvExample.visibility = View.VISIBLE
-        tvExample.text = "▪ ${it.replace("\n", "\n▪ ")}"
-    }?:let {
-        tvExampleFlag.visibility = View.GONE
-        tvExample.visibility = View.GONE
+    when{
+        example.isNullOrEmpty() -> {
+            tvExampleFlag.visibility = View.GONE
+            tvExample.visibility = View.GONE
+        }
+        else -> example.let {
+            tvExampleFlag.visibility = View.VISIBLE
+            tvExample.visibility = View.VISIBLE
+            tvExample.text = "▪ ${it.replace("\n", "\n▪ ")}"
+        }
     }
-    
-    refrence?.let {
-        tvReferenceFlag.visibility = View.VISIBLE
-        tvReference.visibility = View.VISIBLE
-        tvReference.text = refrence
-    }?:let {
-        tvReferenceFlag.visibility = View.GONE
-        tvReference.visibility = View.GONE
+    when{
+        refrence.isNullOrEmpty() -> {
+            tvReferenceFlag.visibility = View.GONE
+            tvReference.visibility = View.GONE
+        }
+        else -> example.let {
+            tvReferenceFlag.visibility = View.VISIBLE
+            tvReference.visibility = View.VISIBLE
+            tvReference.text = refrence
+        }
     }
 }

app/src/main/java/com/xkl/cdl/data/manager/db/DBCourseManager.kt

@@ -201,10 +201,8 @@ object DBCourseManager {
         mDataBase?.rawQuery(sql, null)?.run {
             when (base.courseType) {
                 AppConstants.COURSE_TYPE_ENGLISH_DISCERN, AppConstants.COURSE_TYPE_ENGLISH_VOICE,
-                AppConstants.COURSE_TYPE_ENGLISH_SOUNDMARK, AppConstants.COURSE_TYPE_CHINESE_LITERACY,
-                AppConstants.COURSE_TYPE_CHINESE_PINYIN,
-                -> {
-                    while (moveToNext()) {
+                AppConstants.COURSE_TYPE_CHINESE_LITERACY,
+                AppConstants.COURSE_TYPE_CHINESE_PINYIN    -> while (moveToNext()) {
                         result.add(ExamBean().apply {
                             id = getLong(0)
                             word_id = getLong(1)
@@ -218,6 +216,19 @@ object DBCourseManager {
                             lessonId = getLong(9)
                         })
                     }
+                AppConstants.COURSE_TYPE_ENGLISH_SOUNDMARK ->  while (moveToNext()) {
+                    result.add(ExamBean().apply {
+                        id = getLong(0)
+                        word_id = getLong(1)
+                        word = getString(2)
+                        correct = getString(3)
+                        error1 = getString(4)
+                        error2 = getString(5)
+                        error3 = getString(6)
+                        type = AppConstants.TEST_QUEST_TYPE_CHOICE        // 为1
+                        chapterId = getLong(11)
+                        lessonId = getLong(12)
+                    })
                 }
                 AppConstants.COURSE_TYPE_ENGLISH_SPELL -> {
                     while (moveToNext()) {

app/src/main/java/com/xkl/cdl/dialog/CoursePackIntroductionBottomSheetDialog.kt

@@ -0,0 +1,96 @@
+package com.xkl.cdl.dialog
+
+import android.annotation.SuppressLint
+import android.app.Dialog
+import android.os.Bundle
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import android.view.WindowManager
+import android.widget.FrameLayout
+import androidx.coordinatorlayout.widget.CoordinatorLayout
+import androidx.databinding.DataBindingUtil
+import com.google.android.material.bottomsheet.BottomSheetBehavior
+import com.google.android.material.bottomsheet.BottomSheetDialog
+import com.google.android.material.bottomsheet.BottomSheetDialogFragment
+import com.suliang.common.AppConfig
+import com.suliang.common.extension.setHtml
+import com.suliang.common.util.os.ScreenUtil
+import com.xkl.cdl.R
+import com.xkl.cdl.databinding.DialogBottomCoursePackIntroductionBinding
+
+/**
+ * author suliang
+ * create 2022/5/13 10:51
+ * Describe:
+ */
+class CoursePackIntroductionBottomSheetDialog: BottomSheetDialogFragment() {
+    
+    companion object{
+        fun newInstance(coursePackName : String, introduction : String) : CoursePackIntroductionBottomSheetDialog {
+            val args = Bundle()
+            args.putString(AppConfig.INTENT_1, coursePackName)
+            args.putString(AppConfig.INTENT_2,introduction)
+            val fragment = CoursePackIntroductionBottomSheetDialog()
+            fragment.arguments = args
+            return fragment
+        }
+    }
+    
+    
+    var behavior : BottomSheetBehavior<FrameLayout>? = null
+    
+    override fun onCreateDialog(savedInstanceState : Bundle?) : Dialog {
+       return context?.let {
+            BottomSheetDialog(it,R.style.dialog_style)
+        }?: super.onCreateDialog(savedInstanceState)
+    }
+    
+    @SuppressLint("ClickableViewAccessibility")
+    override fun onCreateView(inflater : LayoutInflater, container : ViewGroup?, savedInstanceState : Bundle?) : View? {
+        val introductionBinding = DataBindingUtil.inflate<DialogBottomCoursePackIntroductionBinding>(layoutInflater,
+                                                                                                                           R.layout.dialog_bottom_course_pack_introduction,
+                                                                                                                           null, false)
+        //标题
+        introductionBinding.tvTitle.text = requireArguments()[AppConfig.INTENT_1]  as String
+        //内容
+        (requireArguments()[AppConfig.INTENT_2]  as String).let {
+            if (it.isNotEmpty()) {
+                introductionBinding.tvIntroduction.setHtml(it)
+            }
+        }
+        
+        return introductionBinding.root
+    }
+    
+    
+    override fun onStart() {
+        super.onStart()
+        dialog?.window?.setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_HIDDEN)
+        (dialog as BottomSheetDialog).delegate.findViewById<FrameLayout>(R.id.design_bottom_sheet)?.let {
+            (it.layoutParams as CoordinatorLayout.LayoutParams).height = ScreenUtil.getScreenHeight() / 6 * 5
+            behavior = BottomSheetBehavior.from(it).apply {
+                state = BottomSheetBehavior.STATE_EXPANDED
+            }
+        }
+    }
+    
+    
+//    override fun onCreate(savedInstanceState : Bundle?) {
+//        super.onCreate(savedInstanceState)
+//        setCancelable(true)
+//        setCanceledOnTouchOutside(true)
+//        behavior.peekHeight = ScreenUtil.getScreenHeight() / 6 * 5
+//        window?.apply {
+//            setLayout(ViewGroup.LayoutParams.MATCH_PARENT,behavior.peekHeight)
+//            setGravity(Gravity.BOTTOM)
+//        }
+//    }
+//
+//    override fun onStart() {
+//        super.onStart()
+//        if (behavior.state == BottomSheetBehavior.STATE_HIDDEN) {
+//            behavior.state = BottomSheetBehavior.STATE_EXPANDED
+//        }
+//    }
+}

app/src/main/java/com/xkl/cdl/module/learn/LearnExamActivity.kt

@@ -135,11 +135,15 @@ class LearnExamActivity : BaseActivityVM<ActivityLearnExamBinding, LearnExamView
     /** 新单词来了的发音事件 */
     private fun initNewWordRead(it : ExamBean) {
         when (vm.intentData.courseType) {
-            //拼写初始不发音，作文不发音
+            //拼写初始不发音，作文不发音, 音标课程测试不发音
+            AppConstants.COURSE_TYPE_ENGLISH_SOUNDMARK,
             AppConstants.COURSE_TYPE_ENGLISH_SPELL, AppConstants.COURSE_TYPE_CHINESE_COMPOSITION -> {
             }
             //英语认读,英语音标,英语口语，语文识字,语文拼音 出现即发音一次
-            AppConstants.COURSE_TYPE_ENGLISH_DISCERN, AppConstants.COURSE_TYPE_ENGLISH_SOUNDMARK, AppConstants.COURSE_TYPE_ENGLISH_SPOKEN, AppConstants.COURSE_TYPE_CHINESE_LITERACY, AppConstants.COURSE_TYPE_CHINESE_PINYIN,
+            AppConstants.COURSE_TYPE_ENGLISH_DISCERN,
+            AppConstants.COURSE_TYPE_ENGLISH_SPOKEN,
+            AppConstants.COURSE_TYPE_CHINESE_LITERACY,
+            AppConstants.COURSE_TYPE_CHINESE_PINYIN,
                 // 英语辨音 重复播放
             AppConstants.COURSE_TYPE_ENGLISH_VOICE -> {
                 wordChooseBinding.ivVoice.performClick()
@@ -160,6 +164,7 @@ class LearnExamActivity : BaseActivityVM<ActivityLearnExamBinding, LearnExamView
             
             //发音方式
             when (vm.intentData.subjectId) {
+                AppConstants.COURSE_TYPE_ENGLISH_SOUNDMARK -> voiceSwitch.visibility = View.GONE
                 AppConstants.SUBJECT_CHINESE -> {
                     vm.defaultSoundWay = AppConstants.SOUND_TYPE_CN
                     voiceSwitch.visibility = View.GONE
@@ -254,11 +259,13 @@ class LearnExamActivity : BaseActivityVM<ActivityLearnExamBinding, LearnExamView
     /** 初始四选一的点击事件 只处理问题和单词的事件，选项事件，每个新的单词开始时设置，答题后再取消设置
      * 拼写，释义、单词都不发音，只有拼写在拼写完成发音
      * 作文知识点测试，没有发音
+     * 音标测试也不发音
      * 辨音、口语单词与音频均可发音，
      * 其他单词可以发音
      * */
     private fun initChooseQuestionListener() {
         when (vm.intentData.courseType) {
+            AppConstants.COURSE_TYPE_ENGLISH_SOUNDMARK,
             AppConstants.COURSE_TYPE_ENGLISH_SPELL, AppConstants.COURSE_TYPE_CHINESE_COMPOSITION -> {
             }
             else -> {

app/src/main/java/com/xkl/cdl/module/learn/LearnWordActivity.kt

@@ -487,8 +487,8 @@ class LearnWordActivity : BaseActivityVM<ActivityLearnWordBinding, LearnWordView
             tag = LEFT_TAG_ANSWER
         }
         binding.incControlButton.tvCenter.visibility = View.INVISIBLE
-        binding.incControlButton.tvRight.visibility = when (vm.learnData.lesson.courseType) {
-            AppConstants.COURSEPACK_TYPE_CHINESE_LITERACY, AppConstants.COURSE_TYPE_CHINESE_PINYIN, AppConstants.COURSE_TYPE_ENGLISH_SOUNDMARK -> View.INVISIBLE
+        binding.incControlButton.tvRight.visibility = when (vm.learnData.lesson.coursePackType) {
+            AppConstants.COURSEPACK_TYPE_CHINESE_COMPOSITION,AppConstants.COURSEPACK_TYPE_ENGLISH_SOUNDMARK -> View.INVISIBLE
             else -> View.VISIBLE
         }
         
@@ -550,11 +550,15 @@ class LearnWordActivity : BaseActivityVM<ActivityLearnWordBinding, LearnWordView
             tag = LEFT_TAG_CORRECT
         }
         binding.incControlButton.tvCenter.visibility = View.VISIBLE
+        //音标，显示重读
+        when(vm.learnData.lesson.coursePackType){
+            AppConstants.COURSEPACK_TYPE_ENGLISH_SOUNDMARK -> View.VISIBLE
+        }
+        
     }
     
     /**点击正确*/
     private fun clickCorrect() {
-        readWord()
         //设tag为0 ，避免出现异常情况
         binding.incControlButton.tvLeft.tag = 0
         adapterHistorical.currentLearnOver()

app/src/main/java/com/xkl/cdl/module/m_center_learn/CoursePackMainActivity.kt

@@ -4,6 +4,8 @@ import android.content.Context
 import android.content.Intent
 import android.graphics.Color
 import android.os.Bundle
+import android.text.Html
+import android.text.method.ScrollingMovementMethod
 import android.view.View
 import androidx.core.content.ContextCompat
 import androidx.core.content.res.ResourcesCompat
@@ -12,29 +14,26 @@ import androidx.fragment.app.Fragment
 import androidx.lifecycle.ViewModel
 import androidx.lifecycle.ViewModelProvider
 import androidx.viewpager2.widget.ViewPager2
+import com.google.android.material.bottomsheet.BottomSheetBehavior
 import com.google.android.material.bottomsheet.BottomSheetDialog
 import com.suliang.common.AppConfig
 import com.suliang.common.base.activity.BaseActivityVM
 import com.suliang.common.extension.click
-import com.suliang.common.util.LogUtil
+import com.suliang.common.extension.setHtml
 import com.suliang.common.util.os.ScreenUtil
 import com.xkl.cdl.R
 import com.xkl.cdl.adapter.AdapterAutoPlaySelectRepeat
 import com.xkl.cdl.adapter.ViewPagerAdapter
 import com.xkl.cdl.data.AppConstants
 import com.xkl.cdl.data.DataTransferHolder
-import com.xkl.cdl.data.bean.LearnDialogBean
-import com.xkl.cdl.data.bean.LearnWord
 import com.xkl.cdl.data.bean.course.Lesson
 import com.xkl.cdl.data.bean.intentdata.LearnData
 import com.xkl.cdl.data.binding.BindingAdapter
 import com.xkl.cdl.data.manager.CourseManager
-import com.xkl.cdl.data.repository.DataRepository
-import com.xkl.cdl.databinding.ActivityCourseMainBinding
-import com.xkl.cdl.databinding.DialogBottomAutoPlaySelectBinding
-import com.xkl.cdl.databinding.DialogBottomCourseMoreBinding
+import com.xkl.cdl.databinding.*
 import com.xkl.cdl.dialog.CommonDialog
 import com.xkl.cdl.dialog.CommonDialogBean
+import com.xkl.cdl.dialog.CoursePackIntroductionBottomSheetDialog
 import com.xkl.cdl.module.learn.LearnWordActivity
 import com.xkl.cdl.module.m_center_learn.coursechildren.CourseMainFragment
 import com.zackratos.ultimatebarx.ultimatebarx.statusBarOnly
@@ -87,12 +86,21 @@ class CoursePackMainActivity : BaseActivityVM<ActivityCourseMainBinding, CourseP
         //设置简介的箭头大小
         ResourcesCompat.getDrawable(resources, R.drawable.ic_arrow_right, null)?.apply {
             setBounds(0, 0, 36, 36)
-            binding.textViewIntroduction.setCompoundDrawables(null, null, this, null)
+            binding.tvIntroduction.setCompoundDrawables(null, null, this, null)
+        }
+        //简介点击
+        binding.tvIntroduction.click {
+            showIntroductionDialog()
         }
         //返回事件
         binding.includeTitleBar.titleBar.run {
             onBackClick = { _ -> finish() }
         }
+        //更多按钮点击
+        binding.includeCourseProgress.ivMore.click {
+            if ((childFragments[binding.viewPager2.currentItem] as CourseMainFragment).vm.showMoreIsEnable()) showMoreDialog()
+            else showToast("请先进行学习")
+        }
         
         //初始化tab和viewPager
         initTabAndViewPager()
@@ -183,20 +191,21 @@ class CoursePackMainActivity : BaseActivityVM<ActivityCourseMainBinding, CourseP
                 }
             }
         }
-        //更多按钮点击
-        binding.includeCourseProgress.ivMore.click {
-            if ((childFragments[binding.viewPager2.currentItem] as CourseMainFragment).vm.showMoreIsEnable()) showMoreDialog()
-            else showToast("请先进行学习")
-        }
+       
     }
     
     override fun loadData() {
     
     }
     
+    /** 简介弹窗 */
+    private fun showIntroductionDialog() {
+        CoursePackIntroductionBottomSheetDialog.newInstance(vm.coursePack.coursePackName,vm.coursePack.summary).show(supportFragmentManager,"introducation")
+    }
+    
     /** 点击显示更多的弹窗   */
     private fun showMoreDialog() {
-        val moreDialog = BottomSheetDialog(this, R.style.dialog_style).apply {
+        BottomSheetDialog(this, R.style.dialog_style).apply {
                 val moreBinding = DataBindingUtil.inflate<DialogBottomCourseMoreBinding>(layoutInflater,
                                                                                          R.layout.dialog_bottom_course_more, null,
                                                                                          false)

app/src/main/java/com/xkl/cdl/module/splash/SplashActivity.kt

@@ -53,7 +53,7 @@ class SplashActivity : BaseActivity<ActivitySplashBinding>(){
 
             //读取课程数据
             // TODO: 2022/3/22  读取当前app绑定的课程数据，
-            DbCoursePackManager().queryBindingCoursePack("262,261,264,136,547,615")
+            DbCoursePackManager().queryBindingCoursePack("262,261,264,136,547,615,516,411")
             //复制课程的数据库到对应位置
             CourseManager.checkCourseDb()
             //定时跳跃到住主界面

app/src/main/res/layout/activity_course_main.xml

@@ -92,7 +92,7 @@
 
         <!--简介-->
         <TextView
-            android:id="@+id/text_view_introduction"
+            android:id="@+id/tv_introduction"
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"
             android:layout_marginEnd="@dimen/global_spacing"

app/src/main/res/layout/dialog_bottom_course_pack_introduction.xml

@@ -0,0 +1,75 @@
+<?xml version="1.0" encoding="utf-8"?>
+<layout 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">
+
+    <data>
+
+    </data>
+        <LinearLayout
+            android:layout_width="match_parent"
+            android:layout_height="match_parent"
+            android:background="@drawable/shape_rounder_toplr_24_white"
+            android:orientation="vertical"
+            android:paddingStart="@dimen/global_spacing"
+            android:paddingTop="24dp"
+            android:paddingEnd="@dimen/global_spacing"
+            android:paddingBottom="10dp">
+
+            <TextView
+                android:id="@+id/tv_title"
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:textColor="@color/main_text_color"
+                android:textSize="22dp"
+                android:textStyle="bold"
+                tools:text="学考乐小学英语单词班" />
+
+            <TextView
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:layout_marginTop="12dp"
+                android:text="@string/course_introduction"
+                android:textColor="@color/main_text_color"
+                android:textSize="@dimen/bigSize"
+                android:textStyle="bold" />
+<!--            <androidx.core.widget.NestedScrollView-->
+<!--                android:layout_width="match_parent"-->
+<!--                android:layout_height="match_parent"-->
+<!--                android:overScrollMode="never"-->
+<!--                >-->
+
+                <TextView
+                    android:id="@+id/tv_introduction"
+                    android:layout_width="match_parent"
+                    android:layout_height="match_parent"
+                    app:layout_behavior="@string/appbar_scrolling_view_behavior"
+                    android:layout_marginTop="12dp"
+                    android:textColor="@color/gray_2"
+                    android:textSize="@dimen/smallSize"
+                    android:text="getLayoutPosition，顾名思义，就是获取该ViewHolder在实际布局中的位置。我们都知道，RecyclerView使用LayoutManager来管理数据集的现实。当开发者调用notifyData*()等方法通知RecyclerView刷新UI时，出于性能的考虑，RecyclerView的UI并不会立刻刷新，和Data保持一致，而是通过LayoutManager惰性更新相关布局——这个过程伴随着时间上的等待，通常情况下，这个等待时间小于16ms。所以，从感官上讲，getLayoutPosition与getAbsoluteAdapterPosition十分相似：getAbsoluteAdapterPosition返回的是该ViewHolder相对于RecyclerView的绝对位置，而getLayoutPosition返回的是该ViewHolder相对于RecyclerView实际布局的绝对位置。
+
+说具体点，就是adapter和layout的位置会有时间差(通常情况下16ms), 如果你改变了Adapter的数据然后刷新视图, layout需要过一段时间才会更新视图, 在这段时间里面, 这两个方法返回的position会不一样。
+
+在notifyDataSetChanged之后并不能马上获取Adapter中的position, 要等布局结束之后才能获取到.
+
+而对于Layout的position, 在notifyItemInserted之后, Layout不能马上获取到新的position, 因为布局还没更新(需要16ms的时间刷新视图), 所以只能获取到旧的, 但是Adapter中的position就可以马上获取到最新的position。
+
+所以，对于上面的点击事件的场景，我们在获取用户点击位置的时候，使用getLayoutPosition可能效果更好，这样，就能确保用户点击的始终是他看到的那个数据（消除16ms带来的时间差问题），代码可以改造成下面这样
+————————————————
+版权声明：本文为CSDN博主「普通网友」的原创文章，遵循CC 4.0 BY-SA版权协议，转载请附上原文出处链接及本声明。
+原文链接：https://blog.csdn.net/u012165769/article/details/119706823遇到这种方法模棱两可，让人傻傻getLayoutPosition，顾名思义，就是获取该ViewHolder在实际布局中的位置。我们都知道，RecyclerView使用LayoutManager来管理数据集的现实。当开发者调用notifyData*()等方法通知RecyclerView刷新UI时，出于性能的考虑，RecyclerView的UI并不会立刻刷新，和Data保持一致，而是通过LayoutManager惰性更新相关布局——这个过程伴随着时间上的等待，通常情况下，这个等待时间小于16ms。所以，从感官上讲，getLayoutPosition与getAbsoluteAdapterPosition十分相似：getAbsoluteAdapterPosition返回的是该ViewHolder相对于RecyclerView的绝对位置，而getLayoutPosition返回的是该ViewHolder相对于RecyclerView实际布局的绝对位置。
+
+说具体点，就是adapter和layout的位置会有时间差(通常情况下16ms), 如果你改变了Adapter的数据然后刷新视图, layout需要过一段时间才会更新视图, 在这段时间里面, 这两个方法返回的position会不一样。
+
+在notifyDataSetChanged之后并不能马上获取Adapter中的position, 要等布局结束之后才能获取到.
+
+而对于Layout的position, 在notifyItemInserted之后, Layout不能马上获取到新的position, 因为布局还没更新(需要16ms的时间刷新视图), 所以只能获取到旧的, 但是Adapter中的position就可以马上获取到最新的position。
+
+所以，对于上面的点击事件的场景，我们在获取用户点击位置的时候，使用getLayoutPosition可能效果更好，这样，就能确保用户点击的始终是他看到的那个数据（消除16ms带来的时间差问题），代码可以改造成下面这样
+————————————————
+版权声明：本文为CSDN博主「普通网友」的原创文章，遵循CC 4.0 BY-SA版权协议，转载请附上原文出处链接及本声明。
+原文链接：https://blog.csdn.net/u012165769/article/details/119706823遇到这种方法模棱两可，让人傻傻分不清楚的情况，作为API调用者的我们，需要我们做到的就是适当的阅读源码注释，结合官方文档，正确理解他们各自所代表的含义以及可能带来的影响，合理使用他们。" />
+<!--            </androidx.core.widget.NestedScrollView>-->
+        </LinearLayout>
+</layout>

app/src/main/res/values-land/dimens.xml

@@ -1,3 +0,0 @@
-<resources>
-    <dimen name="fab_margin">48dp</dimen>
-</resources>

app/src/main/res/values-w1240dp/dimens.xml

@@ -1,3 +0,0 @@
-<resources>
-    <dimen name="fab_margin">200dp</dimen>
-</resources>

app/src/main/res/values-w600dp/dimens.xml

@@ -1,3 +0,0 @@
-<resources>
-    <dimen name="fab_margin">48dp</dimen>
-</resources>

app/src/main/res/values/strings.xml

@@ -84,5 +84,6 @@
     <string name="course_relearn_sure">确认清空</string>
     <string name="quit_auto_play_title">你确定要退出自动播放吗？</string>
     <string name="quit_auto_play_title_over">本课程自动播放完毕</string>
+    <string name="course_introduction">课程简介</string>
 
 </resources>