add registration page with nickname/phone fields and fix lateinit crashes

android/sample-app/src/main/java/cn/learningpad/oraltrainer/sample/MainActivity.kt

@@ -115,6 +115,12 @@ class MainActivity : Activity() {
     private var authUsernameInput: EditText? = null
     private var authPasswordInput: EditText? = null
     private var authStatusText: TextView? = null
+    private var regUsernameInput: EditText? = null
+    private var regPasswordInput: EditText? = null
+    private var regNicknameInput: EditText? = null
+    private var regPhoneInput: EditText? = null
+    private var regStatusText: TextView? = null
+    private var showingRegisterPage = false
     private var myContentList: LinearLayout? = null
     private var sentenceBoundaryRequestGeneration = 0
     private var catalogVideos: List<TrainingVideoSummary> = emptyList()
@@ -320,7 +326,13 @@ class MainActivity : Activity() {
     }
 
     private fun setRootView() {
-        setContentView(if (isLoggedIn()) createContentView() else createAuthView())
+        setContentView(
+            when {
+                isLoggedIn() -> createContentView()
+                showingRegisterPage -> createRegisterView()
+                else -> createAuthView()
+            }
+        )
         if (isLoggedIn()) {
             renderCatalog()
             refreshCurrentUi()
@@ -375,13 +387,137 @@ class MainActivity : Activity() {
             })
             addView(Button(this@MainActivity).apply {
                 text = "注册"
-                setOnClickListener { authenticate(register = true) }
+                setOnClickListener {
+                    showingRegisterPage = true
+                    setRootView()
+                }
                 layoutParams = LinearLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, 44.dp).withMargins(0, 0, 0, 0)
             })
             addView(authStatusText)
         }
     }
 
+    private fun createRegisterView(): View {
+        return ScrollView(this).apply {
+            layoutParams = ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT)
+            setBackgroundColor(COLOR_BACKGROUND)
+            addView(LinearLayout(this@MainActivity).apply {
+                orientation = LinearLayout.VERTICAL
+                gravity = Gravity.CENTER_HORIZONTAL
+                setPadding(28.dp, 60.dp, 28.dp, 28.dp)
+
+                addView(TextView(this@MainActivity).apply {
+                    text = "注册账号"
+                    textSize = 28f
+                    typeface = Typeface.DEFAULT_BOLD
+                    setTextColor(Color.WHITE)
+                })
+                addView(TextView(this@MainActivity).apply {
+                    text = "填写以下信息完成注册"
+                    textSize = 14f
+                    setTextColor(COLOR_TEXT_MUTED)
+                    setPadding(0, 6.dp, 0, 24.dp)
+                })
+
+                addView(fieldLabel("用户名"))
+                regUsernameInput = EditText(this@MainActivity).apply {
+                    hint = "3-50 位字母、数字或下划线"
+                    setSingleLine(true)
+                }
+                addView(regUsernameInput)
+
+                addView(fieldLabel("密码"))
+                regPasswordInput = EditText(this@MainActivity).apply {
+                    hint = "至少 8 位"
+                    inputType = android.text.InputType.TYPE_CLASS_TEXT or android.text.InputType.TYPE_TEXT_VARIATION_PASSWORD
+                    setSingleLine(true)
+                }
+                addView(regPasswordInput)
+
+                addView(fieldLabel("姓名"))
+                regNicknameInput = EditText(this@MainActivity).apply {
+                    hint = "你的真实姓名或昵称"
+                    setSingleLine(true)
+                }
+                addView(regNicknameInput)
+
+                addView(fieldLabel("手机号"))
+                regPhoneInput = EditText(this@MainActivity).apply {
+                    hint = "选填"
+                    inputType = android.text.InputType.TYPE_CLASS_PHONE
+                    setSingleLine(true)
+                }
+                addView(regPhoneInput)
+
+                regStatusText = TextView(this@MainActivity).apply {
+                    setTextColor(COLOR_ACCENT_LIGHT)
+                    textSize = 13f
+                    setPadding(0, 14.dp, 0, 0)
+                }
+
+                addView(Button(this@MainActivity).apply {
+                    text = "注册"
+                    background = rounded(COLOR_ACCENT, 8f)
+                    setTextColor(Color.WHITE)
+                    setOnClickListener { submitRegistration() }
+                    layoutParams = LinearLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, 48.dp).withMargins(0, 20.dp, 0, 8.dp)
+                })
+                addView(Button(this@MainActivity).apply {
+                    text = "返回登录"
+                    setOnClickListener {
+                        showingRegisterPage = false
+                        regStatusText = null
+                        setRootView()
+                    }
+                    layoutParams = LinearLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, 44.dp).withMargins(0, 0, 0, 0)
+                })
+                addView(regStatusText)
+            })
+        }
+    }
+
+    private fun fieldLabel(label: String): TextView {
+        return TextView(this).apply {
+            text = label
+            textSize = 13f
+            setTextColor(COLOR_TEXT_MUTED)
+            setPadding(0, 12.dp, 0, 4.dp)
+        }
+    }
+
+    private fun submitRegistration() {
+        val username = regUsernameInput?.text?.toString()?.trim().orEmpty()
+        val password = regPasswordInput?.text?.toString().orEmpty()
+        val nickname = regNicknameInput?.text?.toString()?.trim().orEmpty()
+        val phone = regPhoneInput?.text?.toString()?.trim().orEmpty()
+
+        if (username.length < 3) {
+            regStatusText?.text = "用户名至少 3 个字符"
+            return
+        }
+        if (password.length < 8) {
+            regStatusText?.text = "密码至少 8 位"
+            return
+        }
+        if (nickname.isBlank()) {
+            regStatusText?.text = "请填写姓名"
+            return
+        }
+
+        regStatusText?.text = "注册中..."
+        sdk.userApi.register(username, password, nickname, phone) { result ->
+            result.fold(
+                onSuccess = { session ->
+                    showingRegisterPage = false
+                    saveAuthSession(session)
+                },
+                onFailure = { error ->
+                    regStatusText?.text = "注册失败：${error.message}"
+                },
+            )
+        }
+    }
+
     private fun authenticate(register: Boolean) {
         val username = authUsernameInput?.text?.toString()?.trim().orEmpty()
         val password = authPasswordInput?.text?.toString().orEmpty()
@@ -392,7 +528,7 @@ class MainActivity : Activity() {
                 onFailure = { error -> authStatusText?.text = "失败：${error.message}" },
             )
         }
-        if (register) sdk.userApi.register(username, password, callback)
+        if (register) sdk.userApi.register(username, password, onComplete = callback)
         else sdk.userApi.login(username, password, callback)
     }
 
@@ -1473,6 +1609,7 @@ class MainActivity : Activity() {
             }
 
             override fun onMediaChanged(item: TrainingMediaItem?) {
+                if (!::lessonTitleText.isInitialized) return
                 lessonTitleText.text = item?.title ?: "未选择课程"
                 currentSentenceCount = item?.sentences?.size ?: 0
             }
@@ -1482,6 +1619,7 @@ class MainActivity : Activity() {
             }
 
             override fun onGesture(event: GestureEvent) {
+                if (!::statusText.isInitialized) return
                 statusText.text = when (event.kind) {
                     GestureKind.SINGLE_TAP -> "播放状态已切换"
                     GestureKind.SWIPE_LEFT -> "已跳到上一句"
@@ -1491,12 +1629,18 @@ class MainActivity : Activity() {
             }
 
             override fun onPlayerError(error: Throwable) {
+                if (!::statusText.isInitialized) return
                 statusText.text = "播放失败：${error.message.orEmpty()}"
             }
         }
     }
 
     private fun applyPlaybackSnapshot(snapshot: PlaybackSnapshot) {
+        if (!::timeText.isInitialized || !::progressBar.isInitialized ||
+            !::speedText.isInitialized || !::statusText.isInitialized
+        ) {
+            return
+        }
         if (!progressBarDragging) {
             timeText.text = "${formatTime(snapshot.positionMs)} / ${formatTime(snapshot.durationMs)}"
             progressBar.progress = playbackProgress(snapshot)
@@ -1514,6 +1658,11 @@ class MainActivity : Activity() {
     }
 
     private fun applySentence(sentence: SentenceBoundary?) {
+        if (!::sentenceMetaText.isInitialized || !::sentenceText.isInitialized ||
+            !::lessonTitleText.isInitialized
+        ) {
+            return
+        }
         if (sentence == null) {
             sentenceMetaText.text = "暂无句子边界"
             sentenceText.text = lessonTitleText.text
@@ -1606,6 +1755,11 @@ class MainActivity : Activity() {
     }
 
     private fun createCourseSection(): View {
+        if (!::catalogList.isInitialized) {
+            catalogList = LinearLayout(this).apply {
+                orientation = LinearLayout.VERTICAL
+            }
+        }
         return ScrollView(this).apply {
             layoutParams = LinearLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, 0, 1f)
             addView(LinearLayout(this@MainActivity).apply {