android: 相册页接线+演示模式(真实管线渲染合成帧+demo温度显示映射)

android/app/src/main/kotlin/com/mag160c/thermal/ui/AppRoot.kt

@@ -24,6 +24,7 @@ import androidx.compose.ui.platform.LocalConfiguration
 import androidx.compose.ui.res.painterResource
 import androidx.compose.ui.unit.dp
 import com.mag160c.thermal.R
+import com.mag160c.thermal.ui.gallery.GalleryScreen
 import com.mag160c.thermal.ui.live.LiveScreen
 import com.mag160c.thermal.ui.settings.SettingsScreen
 
@@ -43,12 +44,12 @@ fun AppRoot() {
         LocalConfiguration.current.orientation == Configuration.ORIENTATION_LANDSCAPE
 
     val content: @Composable () -> Unit = {
-            when (tab) {
+        when (tab) {
-                0 -> LiveScreen()
+            0 -> LiveScreen()
-                1 -> Placeholder("媒体库（阶段4实现）")
+            1 -> GalleryScreen()
-                2 -> Placeholder("MDT 离线分析（阶段5实现）")
+            2 -> GalleryScreen()
-                else -> SettingsScreen()
+            else -> SettingsScreen()
-            }
+        }
     }
 
     if (isLandscape) {

android/app/src/main/kotlin/com/mag160c/thermal/ui/live/LiveRenderer.kt

@@ -111,15 +111,15 @@ class LiveRenderer(
     }
 
     private fun drawIdle(canvas: Canvas, w: Float, h: Float) {
-        textPaint.color = Color.GRAY
+        // status text is shown by the Compose overlay; keep the canvas black
-        canvas.drawText("等待热像仪连接…", w / 2f - 90, h / 2f, textPaint)
-        textPaint.color = Color.WHITE
     }
 
     private fun drawOsd(canvas: Canvas, state: LiveViewModel.LiveState) {
         textPaint.color = Color.WHITE
+        val ox = viewport.left + 10f
+        val oy = viewport.top + textPaint.textSize + 8f
         state.centerTempC?.let {
-            canvas.drawText("中心 %.1f℃".format(it), 10f, textPaint.textSize + 8f, textPaint)
+            canvas.drawText("中心 %.1f℃".format(it), ox, oy, textPaint)
         }
         if (state.maxTraceOn) {
             drawTempMarker(canvas, state.maxPos, state.maxTempC)

android/app/src/main/kotlin/com/mag160c/thermal/ui/live/LiveScreen.kt

@@ -122,7 +122,9 @@ private fun ControlBar(state: LiveViewModel.LiveState, vm: LiveViewModel) {
                     style = MaterialTheme.typography.titleLarge,
                 )
                 Text(
-                    text = "%.1f / %.1f℃".format(state.maxTempC ?: 0f, state.minTempC ?: 0f),
+                    text = if (state.maxTempC != null && state.minTempC != null)
+                        "%.1f / %.1f℃".format(state.maxTempC, state.minTempC)
+                    else "-- / --℃",
                     style = MaterialTheme.typography.bodySmall,
                 )
             }

android/app/src/main/kotlin/com/mag160c/thermal/ui/live/LiveViewModel.kt

@@ -7,6 +7,8 @@ import com.mag160c.thermal.core.TempMath
 import com.mag160c.thermal.usb.IrSession
 import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.flow.StateFlow
+import kotlinx.coroutines.delay
+import kotlinx.coroutines.launch
 
 /**
  * Live view state machine: USB permission -> link -> stream -> OSD stats.
@@ -87,10 +89,15 @@ class LiveViewModel(app: Application) : AndroidViewModel(app) {
         }
     }
 
-    /** Begin USB permission flow, then start streaming. */
+    /** Begin USB permission flow, then start streaming. No device -> demo mode. */
     fun connect() {
         val context = getApplication<Application>()
         val transport = com.mag160c.thermal.usb.UsbTransport(context)
+        val dev = transport.findDevice()
+        if (dev == null) {
+            startDemo()
+            return
+        }
         transport.requestPermission { ok ->
             if (ok) {
                 val ddt = runCatching { context.assets.open("mag160c.ddt").readBytes() }
@@ -102,6 +109,87 @@ class LiveViewModel(app: Application) : AndroidViewModel(app) {
         }
     }
 
+    private var demoPipeline: com.mag160c.thermal.core.RenderPipeline? = null
+    private var demoJob: kotlinx.coroutines.Job? = null
+
+    /**
+     * Demo mode: feed synthetic frames through the REAL render pipeline
+     * (official DDT bundled) so the UI is fully explorable without hardware.
+     */
+    private fun startDemo() {
+        if (demoJob?.isActive == true) return
+        _state.value = _state.value.copy(connected = true, streaming = true, status = "demo")
+        val frames = buildDemoFrames()
+        demoJob = viewModelScope.launch(kotlinx.coroutines.Dispatchers.Default) {
+            val ddt = runCatching {
+                getApplication<Application>().assets.open("mag160c.ddt").readBytes()
+            }.getOrDefault(ByteArray(0))
+            val pipe = com.mag160c.thermal.core.RenderPipeline(160, 120, onFfc = {})
+            if (!pipe.loadDdt(ddt)) return@launch
+            demoPipeline = pipe
+            val out = IntArray(320 * 240)
+            var count = 0
+            while (demoPipeline != null) {
+                for (f in frames.indices) {
+                    val p = demoPipeline ?: return@launch
+                    if (p.frame(frames[f], true, out)) {
+                        latestFrame = out.copyOf()
+                        count++
+                        if (count % 8 == 0) refreshTemps()
+                    }
+                    delay(66)
+                }
+            }
+        }
+    }
+
+    /** Synthetic 60-frame cycle (gradient scene + slow shutter drift). */
+    private fun buildDemoFrames(): ArrayList<ByteArray> {
+        val frameSize = 0x38 + 38400
+        val frames = ArrayList<ByteArray>(60)
+        var seed = 20260906
+        for (f in 0 until 60) {
+            val buf = ByteArray(frameSize)
+            var acc = seed
+            fun next(): Int {
+                acc = (acc * 1103515245 + 12345) and 0x7FFFFFFF
+                return acc % 97 - 48
+            }
+            seed = acc
+            for (i in 0 until 19200) {
+                val x = i % 160
+                val y = i / 160
+                var base = x * 4 + y * 3 + 14000
+                // warm block (like a hand in frame), upper-right area
+                if (x in 96..144 && y in 28..76) base += 620
+                if (x in 104..136 && y in 36..68) base += 180
+                val v = (base + next()).coerceIn(0, 65535)
+                val off = 0x1C + i * 2
+                buf[off] = (v and 0xFF).toByte()
+                buf[off + 1] = ((v shr 8) and 0xFF).toByte()
+            }
+            frames.add(buf)
+        }
+        // headers + trailers
+        for (f in frames.indices) {
+            val buf = frames[f]
+            put32(buf, 0, 0x1BB1B11B)
+            put32(buf, 4, f)
+            put32(buf, 8, 38400)
+            put32(buf, 12, if (f in 6..9) 1 else 0)
+            put32(buf, 16, 4096 + f / 4)
+            put32(buf, 0x1C + 38400, 0x1BB1B11C)
+        }
+        return frames
+    }
+
+    private fun put32(dst: ByteArray, off: Int, v: Int) {
+        dst[off] = (v and 0xFF).toByte()
+        dst[off + 1] = ((v shr 8) and 0xFF).toByte()
+        dst[off + 2] = ((v shr 16) and 0xFF).toByte()
+        dst[off + 3] = ((v ushr 24) and 0xFF).toByte()
+    }
+
     fun disconnect() = session.stop()
 
     fun triggerFfc() = session.triggerFfc()
@@ -206,11 +294,47 @@ class LiveViewModel(app: Application) : AndroidViewModel(app) {
 
     /** Update per-frame temperature stats (called on a slow timer). */
     fun refreshTemps() {
+        val demo = demoPipeline
+        if (demo != null) {
+            // Demo-only display mapping (true calibration needs hardware).
+            demo.copyNuc(demoNuc)
+            var mean = 0L
+            var mn = Int.MAX_VALUE
+            var mx = -1
+            var mnPos = -1
+            var mxPos = -1
+            for (i in demoNuc.indices) {
+                val v = demoNuc[i]
+                mean += v
+                if (v < mn) { mn = v; mnPos = i }
+                if (v > mx) { mx = v; mxPos = i }
+            }
+            mean /= demoNuc.size
+            val mv = mean.toFloat()
+            val probes = _state.value.probes.map { p ->
+                val v = demoNuc[p.y * 160 + p.x]
+                p.copy(tempC = 24f + (v - mean) * 0.02f)
+            }
+            _state.value = _state.value.copy(
+                centerTempC = 24f + (demoNuc[60 * 160 + 80] - mean) * 0.02f,
+                maxTempC = 24f + (mx - mean) * 0.02f,
+                minTempC = 24f + (mn - mean) * 0.02f,
+                maxPos = mxPos,
+                minPos = mnPos,
+                probes = probes,
+            )
+            return
+        }
         if (!session.isStreaming()) return
         val center = session.probeTemp(80, 60)
         val nuc = IntArray(19200)
-        val ok = session.copyNuc(nuc)
+        if (!session.copyNuc(nuc)) return
-        if (!ok) return
+        updateTemps(center, nuc)
+    }
+
+    private val demoNuc = IntArray(19200)
+
+    private fun updateTemps(center: Int?, nuc: IntArray) {
         var mn = Int.MAX_VALUE
         var mx = -1
         var mnPos = -1
@@ -226,7 +350,6 @@ class LiveViewModel(app: Application) : AndroidViewModel(app) {
                 mxPos = i
             }
         }
-        // probe temperatures
         val probes = _state.value.probes.map { p ->
             p.copy(tempC = TempMath.countsToTempMc(nuc[p.y * 160 + p.x]) / 1000f)
         }
@@ -241,6 +364,7 @@ class LiveViewModel(app: Application) : AndroidViewModel(app) {
     }
 
     override fun onCleared() {
+        demoPipeline = null
         session.destroy()
         super.onCleared()
     }

android/app/src/main/res/drawable/ic_camera.xml

@@ -1,5 +1,5 @@
 <vector xmlns:android="http://schemas.android.com/apk/res/android" android:width="24dp" android:height="24dp" android:viewportWidth="24" android:viewportHeight="24">
   <path android:pathData="M4,7 L4,19 L20,19 L20,7 Z" android:strokeColor="#FF000000" android:strokeWidth="2" android:fillColor="#00000000" />
   <path android:pathData="M9,7 L9,5 L15,5 L15,7" android:strokeColor="#FF000000" android:strokeWidth="2" android:fillColor="#00000000" />
-  <path android:pathData="M12,13m-3,0a3,3 0 1,1 6,0a3,3 0 1,1 -6,0" android:strokeColor="#FF000000" android:strokeWidth="2" android:fillColor="#00000000" />
+  <path android:pathData="M12,13m-3,0a3,3 0 1,0 6,0a3,3 0 1,0 -6,0" android:strokeColor="#FF000000" android:strokeWidth="2" android:fillColor="#00000000" />
 </vector>

android/app/src/main/res/drawable/ic_ffc.xml

@@ -1,5 +1,5 @@
 <vector xmlns:android="http://schemas.android.com/apk/res/android" android:width="24dp" android:height="24dp" android:viewportWidth="24" android:viewportHeight="24">
+  <path android:pathData="M5,12a7,7 0 1,0 14,0a7,7 0 1,0 -14,0z" android:strokeColor="#FF000000" android:strokeWidth="2" android:fillColor="#00000000" />
   <path android:pathData="M12,3 L12,7 M12,17 L12,21 M3,12 L7,12 M17,12 L21,12" android:strokeColor="#FF000000" android:strokeWidth="2" />
-  <path android:pathData="M12,5a7,7 0 1,0 0.001,0z" android:strokeColor="#FF000000" android:strokeWidth="2" android:fillColor="#00000000" />
   <path android:pathData="M12,12m-2.5,0a2.5,2.5 0 1,1 5,0a2.5,2.5 0 1,1 -5,0" android:fillColor="#FF000000" />
 </vector>

android/app/src/main/res/drawable/ic_record.xml

@@ -1,4 +1,4 @@
 <vector xmlns:android="http://schemas.android.com/apk/res/android" android:width="24dp" android:height="24dp" android:viewportWidth="24" android:viewportHeight="24">
-  <path android:pathData="M12,4a8,8 0 1,0 0.001,0z" android:strokeColor="#FFD32F2F" android:strokeWidth="2.5" android:fillColor="#00000000" />
+  <path android:pathData="M12,8a4,4 0 1,0 8,0a4,4 0 1,0 -8,0z" android:strokeColor="#FFD32F2F" android:strokeWidth="2.5" android:fillColor="#00000000" />
   <path android:pathData="M12,12m-4,0a4,4 0 1,1 8,0a4,4 0 1,1 -8,0" android:fillColor="#FFD32F2F" />
 </vector>

android/app/src/main/res/drawable/ic_zoom.xml

@@ -1,4 +1,4 @@
 <vector xmlns:android="http://schemas.android.com/apk/res/android" android:width="24dp" android:height="24dp" android:viewportWidth="24" android:viewportHeight="24">
-  <path android:pathData="M10.5,3a7.5,7.5 0 1,0 0.001,0z" android:strokeColor="#FF000000" android:strokeWidth="2.5" android:fillColor="#00000000" />
+  <path android:pathData="M3,10.5a7.5,7.5 0 1,0 15,0a7.5,7.5 0 1,0 -15,0z" android:strokeColor="#FF000000" android:strokeWidth="2.5" android:fillColor="#00000000" />
   <path android:pathData="M16,16 L21,21" android:strokeColor="#FF000000" android:strokeWidth="2.5" />
 </vector>