...

app/src/main/kotlin/bums/lunatic/launcher/player/DocumentViewerActivity.kt

@@ -83,7 +83,9 @@ class DocumentViewerActivity : AppCompatActivity() {
             }
             override fun onSwipeLeft(count: Int) { pagedLayout.doNext() }
             override fun onSwipeRight(count: Int) { pagedLayout.doPrev() }
-            override fun onLongClick() { finish() } // 잠깐 확인용이므로 롱클릭 시 종료
+            override fun onLongClick() {
+//                finish()
+            } // 잠깐 확인용이므로 롱클릭 시 종료
             override fun onTimeoverTouch() {}
             override fun onSwipeDown(count: Int) {}
             override fun onSwipeUp(count: Int) {}

app/src/main/kotlin/bums/lunatic/launcher/player/PlayerActivity.kt

@@ -191,6 +191,81 @@ class PlayerActivity : AppCompatActivity(), TextureView.SurfaceTextureListener {
     private lateinit var tvTime: TextView
     private var uiUpdateJob: Job? = null
     private var isUserSeeking = false
+    private fun setupSyncControls(root: FrameLayout) {
+        val topControlLayout = android.widget.LinearLayout(this).apply {
+            orientation = android.widget.LinearLayout.HORIZONTAL
+            gravity = Gravity.CENTER
+            setPadding(0, 20, 0, 0)
+        }
+
+        // [ -0.5s ] 버튼
+        val btnPrev = TextView(this).apply {
+            text = " -0.5s "
+            setTextColor(Color.YELLOW)
+            setPadding(30, 10, 30, 10)
+            setBackgroundColor(Color.parseColor("#66000000"))
+            setOnClickListener {
+                adjustSubtitleSync(500)
+
+            }
+        }
+
+        // [ SYNC RESET ] 버튼
+        val btnReset = TextView(this).apply {
+            text = " SYNC RESET "
+            setTextColor(Color.WHITE)
+            setPadding(40, 10, 40, 10)
+            setMargins(20, 0, 20, 0)
+            setBackgroundColor(Color.parseColor("#AA000000"))
+            setOnClickListener {
+                syncSubtitleToCurrentTime()
+            }
+        }
+
+        // [ +0.5s ] 버튼
+        val btnNext = TextView(this).apply {
+            text = " +0.5s "
+            setTextColor(Color.YELLOW)
+            setPadding(30, 10, 30, 10)
+            setBackgroundColor(Color.parseColor("#66000000"))
+            setOnClickListener {
+                adjustSubtitleSync(500)
+            }
+        }
+
+        topControlLayout.addView(btnPrev)
+        topControlLayout.addView(btnReset)
+        topControlLayout.addView(btnNext)
+
+        root.addView(topControlLayout, FrameLayout.LayoutParams(-2, -2, Gravity.TOP or Gravity.CENTER_HORIZONTAL).apply {
+            topMargin = 100 // 노치나 상태바 아래로 배치
+        })
+    }
+
+    // 헬퍼 함수: Margin 적용용
+    fun View.setMargins(l: Int, t: Int, r: Int, b: Int) {
+        if (layoutParams is ViewGroup.MarginLayoutParams) {
+            val p = layoutParams as ViewGroup.MarginLayoutParams
+            p.setMargins(l, t, r, b)
+            requestLayout()
+        }
+    }
+
+    private fun syncSubtitleToCurrentTime() {
+        if (externalSubtitles.isEmpty()) return
+
+        val currentVideoSec = nativePlayer?.getCurrentPosition() ?: 0.0
+        val firstSubtitleStartSec = externalSubtitles[0].startSec
+
+        val neededDelaySec = firstSubtitleStartSec - currentVideoSec
+        subtitleDelayMs = (neededDelaySec * 1000).toLong()
+
+        currentSubtitleIndex = 0
+        lastSubTitle = "" // 💡 추가: 즉시 갱신을 위해 비움
+
+        val sign = if (subtitleDelayMs >= 0) "+" else ""
+        Toast.makeText(this, "자막 기준점 동기화 완료: $sign${String.format("%.1f", -neededDelaySec)}초 보정", Toast.LENGTH_SHORT).show()
+    }
 
     private fun setupUI() {
         val root = FrameLayout(this).apply { setBackgroundColor(Color.BLACK) }
@@ -280,7 +355,7 @@ class PlayerActivity : AppCompatActivity(), TextureView.SurfaceTextureListener {
         root.addView(bottomControlLayout, FrameLayout.LayoutParams(-1, -2, Gravity.BOTTOM))
         root.addView(geckoWeb, FrameLayout.LayoutParams(-2, -2, Gravity.CENTER))
         setContentView(root)
-
+        setupSyncControls(root)
         hideSystemUI()
     }
 
@@ -435,14 +510,15 @@ class PlayerActivity : AppCompatActivity(), TextureView.SurfaceTextureListener {
     private var subtitleDelayMs: Long = 0L
     private fun adjustSubtitleSync(deltaMs: Long) {
         subtitleDelayMs += deltaMs
+
+        // 💡 핵심: 기존 자막 상태를 초기화하여 루프가 즉시 새 자막을 그리도록 유도
+        lastSubTitle = ""
+
         val seconds = subtitleDelayMs / 1000.0
         val sign = if (subtitleDelayMs >= 0) "+" else ""
         Toast.makeText(this, "자막 싱크: $sign${String.format("%.1f", seconds)}초", Toast.LENGTH_SHORT).show()
-
-        // 싱크가 변경되면 즉시 루프에서 반영되므로 별도의 처리는 필요 없으나,
-        // 즉각적인 피드백을 위해 lastSubTitle을 초기화하여 강제 갱신 유도 가능
-        lastSubTitle = ""
     }
+
     override fun onConfigurationChanged(newConfig: android.content.res.Configuration) {
         super.onConfigurationChanged(newConfig)
         hideSystemUI()