v1.0.5 - 메모 아이콘 정리, 삼성 One UI 최신 알람 화면 개편, 달력 깜빡임 해소 및 카드 스택 전환 애니메이션 적용

app/src/main/java/com/example/shiftalarm/MainActivity.kt

@@ -31,6 +31,9 @@ import java.time.YearMonth
 import java.time.format.DateTimeFormatter
 import java.util.concurrent.TimeUnit
 import androidx.recyclerview.widget.GridLayoutManager
+import android.graphics.Bitmap
+import android.graphics.Canvas
+import android.util.Log
 import kotlin.math.abs
 
 class MainActivity : AppCompatActivity() {
@@ -41,6 +44,8 @@ class MainActivity : AppCompatActivity() {
     private var currentViewMonth: YearMonth = YearMonth.now(ShiftCalculator.SEOUL_ZONE)
     private var currentViewTeam: String = "A"
     private lateinit var gestureDetector: GestureDetector
+    private var calendarAdapter: CalendarAdapter? = null
+    private var isAnimatingMonth = false
 
     override fun onConfigurationChanged(newConfig: android.content.res.Configuration) {
         super.onConfigurationChanged(newConfig)
@@ -261,6 +266,7 @@ class MainActivity : AppCompatActivity() {
 
     private fun setupCalendar() {
         binding.calendarGrid.layoutManager = GridLayoutManager(this, 7)
+        binding.calendarGrid.itemAnimator = null
         updateCalendar()
     }
 
@@ -300,22 +306,45 @@ class MainActivity : AppCompatActivity() {
 
             val days = generateDaysForMonthWithData(currentViewMonth, currentViewTeam, factory, overrides, memos)
 
-            val adapter = CalendarAdapter(days, object : CalendarAdapter.OnDayClickListener {
-                override fun onDayClick(date: LocalDate, currentShift: String) {
-                    showDaySettingsDialog(date, currentShift)
+            val availableHeight = binding.calendarGrid.height
+            val calcRowHeight = if (availableHeight > 0) availableHeight / 5 else 0
+
+            if (calendarAdapter == null || binding.calendarGrid.adapter == null) {
+                val newAdapter = CalendarAdapter(days, object : CalendarAdapter.OnDayClickListener {
+                    override fun onDayClick(date: LocalDate, currentShift: String) {
+                        showDaySettingsDialog(date, currentShift)
+                    }
+                }, binding.cbShowHolidays.isChecked)
+                if (calcRowHeight > 0) {
+                    newAdapter.rowHeight = calcRowHeight
                 }
-            }, binding.cbShowHolidays.isChecked)
-            
-            binding.calendarGrid.adapter = adapter
+                calendarAdapter = newAdapter
+                binding.calendarGrid.adapter = newAdapter
+            } else {
+                calendarAdapter?.let { ad ->
+                    ad.days = days
+                    ad.showHolidays = binding.cbShowHolidays.isChecked
+                    if (calcRowHeight > 0) {
+                        ad.rowHeight = calcRowHeight
+                    }
+                    ad.notifyDataSetChanged()
+                }
+            }
+
             binding.monthTitle.text = currentViewMonth.format(DateTimeFormatter.ofPattern("yyyy년 MM월"))
 
-            // Dynamic row height: exactly 5 rows visible, 6-row months scroll
-            binding.calendarGrid.post {
-                val availableHeight = binding.calendarGrid.height
-                if (availableHeight > 0) {
-                    val calcRowHeight = availableHeight / 5
-                    adapter.rowHeight = calcRowHeight
-                    adapter.notifyDataSetChanged()
+            if (calcRowHeight == 0) {
+                binding.calendarGrid.post {
+                    val h = binding.calendarGrid.height
+                    if (h > 0) {
+                        val rH = h / 5
+                        calendarAdapter?.let {
+                            if (it.rowHeight != rH) {
+                                it.rowHeight = rH
+                                it.notifyDataSetChanged()
+                            }
+                        }
+                    }
                 }
             }
 
@@ -717,7 +746,9 @@ class MainActivity : AppCompatActivity() {
     }
 
     private fun animateMonthTransition(direction: Int) {
+        if (isAnimatingMonth) return
         val card = binding.calendarCard
+        val snapshot = binding.calendarOverlaySnapshot
         val width = card.width.toFloat()
 
         if (width == 0f) {
@@ -730,33 +761,61 @@ class MainActivity : AppCompatActivity() {
             return
         }
 
-        val fluidInterpolator = androidx.core.view.animation.PathInterpolatorCompat.create(0.22f, 1.0f, 0.36f, 1.0f)
+        isAnimatingMonth = true
 
+        // 1. Capture bitmap snapshot of current calendar card
+        try {
+            val bitmap = Bitmap.createBitmap(card.width, card.height, Bitmap.Config.ARGB_8888)
+            val canvas = Canvas(bitmap)
+            card.draw(canvas)
+            snapshot.setImageBitmap(bitmap)
+            snapshot.visibility = android.view.View.VISIBLE
+            snapshot.alpha = 1.0f
+            snapshot.scaleX = 1.0f
+            snapshot.scaleY = 1.0f
+            snapshot.translationX = 0f
+        } catch (e: Exception) {
+            Log.w("MainActivity", "Failed to capture snapshot for month transition", e)
+        }
+
+        // 2. Update to new month immediately
+        currentViewMonth = if (direction > 0) {
+            currentViewMonth.plusMonths(1)
+        } else {
+            currentViewMonth.minusMonths(1)
+        }
+        updateCalendar()
+
+        // 3. Prepare incoming new month card on top
+        card.translationX = if (direction > 0) width else -width
+        card.alpha = 1.0f
+        card.cardElevation = dpToPx(8f).toFloat()
+
+        val fluidInterpolator = androidx.core.view.animation.PathInterpolatorCompat.create(0.22f, 1.0f, 0.36f, 1.0f)
+        val duration = 280L
+
+        // 4. Slide top new month card smoothly into position
         card.animate()
-            .translationX(if (direction > 0) -width else width)
-            .alpha(0.8f)
-            .setDuration(160)
+            .translationX(0f)
+            .setDuration(duration)
             .setInterpolator(fluidInterpolator)
             .withEndAction {
-                currentViewMonth = if (direction > 0) {
-                    currentViewMonth.plusMonths(1)
-                } else {
-                    currentViewMonth.minusMonths(1)
-                }
-                updateCalendar()
-
-                // Incoming slide animation from opposite side
-                card.translationX = if (direction > 0) width else -width
-                card.alpha = 0.8f
-
-                card.animate()
-                    .translationX(0f)
-                    .alpha(1f)
-                    .setDuration(220)
-                    .setInterpolator(fluidInterpolator)
-                    .start()
+                card.cardElevation = 0f
+                snapshot.visibility = android.view.View.GONE
+                snapshot.setImageDrawable(null)
+                isAnimatingMonth = false
             }
             .start()
+
+        // 5. Parallax fade & scale down bottom snapshot card
+        snapshot.animate()
+            .scaleX(0.94f)
+            .scaleY(0.94f)
+            .alpha(0.35f)
+            .translationX(if (direction > 0) -width * 0.22f else width * 0.22f)
+            .setDuration(duration)
+            .setInterpolator(fluidInterpolator)
+            .start()
     }
 
     private fun formatRemainingDays(days: Float): String {